WO2009100802A2 - Schaltungsanordnung und verfahren zum testen einer rücksetzschaltung - Google Patents
Schaltungsanordnung und verfahren zum testen einer rücksetzschaltung Download PDFInfo
- Publication number
- WO2009100802A2 WO2009100802A2 PCT/EP2009/000086 EP2009000086W WO2009100802A2 WO 2009100802 A2 WO2009100802 A2 WO 2009100802A2 EP 2009000086 W EP2009000086 W EP 2009000086W WO 2009100802 A2 WO2009100802 A2 WO 2009100802A2
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- WIPO (PCT)
- Prior art keywords
- input
- circuit
- output
- voltage
- reset
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- Ceased
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/316—Testing of analog circuits
- G01R31/3163—Functional testing
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
- H03K17/223—Modifications for ensuring a predetermined initial state when the supply voltage has been applied in field-effect transistor switches
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/02—Detection or location of defective auxiliary circuits, e.g. defective refresh counters
Definitions
- the present invention relates to a circuit arrangement and a method for testing a reset circuit.
- Circuit arrangements often have a reset circuit, which is supplied with a supply voltage of the circuit arrangement and which provides a reset signal as a function of the supply voltage.
- the reset signal is supplied to a circuit block of the circuit arrangement.
- the reset signal has a value activating the further block of the circuit arrangement, provided that the supply voltage exceeds a level at which the circuit block can be reliably operated. This principle is also referred to as Power on Reset.
- Document US 2006/0041811 A1 describes a circuit for testing a reset function of an electronic component.
- the circuit comprises a first and a second adjustable resistor and a device for switching between different voltages by means of a bridge. A voltage at the output of the circuit is supplied to the device under test.
- Document US 2007/0266280 A1 specifies an arrangement for testing a reset circuit of an integrated circuit.
- the arrangement includes a reset circuit for operation of the integrated circuit and a duplicate reset circuit for testing purposes.
- the object of the present invention is to provide a circuit arrangement for testing a reset circuit and a method for testing a reset circuit, which enable a test of the reset circuit with a test voltage.
- circuitry for testing a reset circuit includes the reset circuit and a switch.
- the reset circuit has a voltage input and an output.
- the switch comprises a first and a second input, a control input and an output. The output of the switch is connected to the voltage input of the reset circuit.
- the voltage input of the reset circuit is supplied with an input voltage. At the output of the reset circuit, a reset signal is provided in response to the input voltage.
- the first input of the switch is supplied with a test voltage.
- the second input of the changeover switch is supplied with a supply voltage.
- a Testeinstellsignal is fed to the control input of the switch. Depending on the Testeinstellsignals the switch is switched between the first and the second input.
- the switch is used to set whether the supply voltage or the test voltage is supplied to the voltage input of the reset circuit.
- the functionality of the reset circuit can be tested in a test mode by means of a test voltage which is independent of the supply voltage of the circuit arrangement.
- the reset circuit may thus generate a digital reset signal in response to an analog test voltage.
- the circuitry includes an input logic circuit.
- the input logic circuit is connected at an output to the control input of the switch and provides the test set signal.
- the input logic circuit may comprise a memory circuit.
- the memory circuit may comprise a flip-flop or an asynchronous logic or a combinatorial logic.
- test mode is activated.
- the first input of the changeover switch is connected to the output of the changeover switch.
- the test setting signal has a logic value 0
- the test mode of the circuit arrangement is deactivated and the circuit arrangement is in a normal mode.
- the second input of the switch is connected to the output of the switch.
- the circuit arrangement has an output logic circuit.
- a first input of the output logic circuit is connected to the output of the reset circuit.
- a second input of the output logic circuit is connected to the output of the input logic circuit.
- a first output of the output logic circuit is connected to a Circuit block of the circuit connected.
- a second output of the output logic circuit is coupled to an output pad of the circuitry.
- the first input of the output logic circuit thus the reset signal is supplied.
- the second input of the output logic circuit is for supplying the test setting signal to the output logic circuit.
- a system reset signal is issued.
- the system reset signal is provided in response to the reset signal and the test set signal. In this case, the system return signal is generated from the reset signal, provided that the test mode of the circuit arrangement is deactivated.
- the system reset signal has a logic value which deactivates the circuit block.
- a result signal is provided at the second output of the output logic circuit. The result signal is generated in response to the reset signal and the test setting signal. If the test setting signal has a value that activates the test mode, then the result signal corresponds to the reset signal. If the test mode is deactivated by means of the test setting signal, the result signal has a constant value.
- the reset circuit can be isolated from the circuit block in the test mode by means of the output logic circuit. The isolation may be performed without generating a system reset signal that resets the circuitry.
- a semiconductor body comprises the circuit arrangement.
- Exactly one semiconductor body preferably comprises the circuit arrangement.
- the semiconductor body may comprise the reset circuit, the input logic circuit and the output logic circuit. Further, the semiconductor body may comprise the switch.
- a power consumption of the circuit arrangement is not increased by the changeover switch, the input logic circuit and the output logic circuit.
- a method of testing a reset circuit includes supplying a supply voltage as an input voltage to the reset circuit in a normal mode. Furthermore, it is switched over from the normal mode to a test mode as a function of a test setting signal. A test voltage is supplied as the input voltage to the reset circuit in the test mode and generates a reset signal by means of the reset circuit in response to the input voltage.
- a test voltage can thus be supplied to a reset circuit and the reset signal can be generated by means of the test voltage.
- the reset signal may be isolated from a circuit block of the circuitry, allowing for isolated test operation of the reset circuit. In test mode, the reset signal is not supplied to the circuit block.
- the method comprises the following steps in the test mode:
- the supply voltage is applied to a circuit arrangement comprising the reset circuit and a circuit block.
- the circuit arrangement is thus turned on.
- the test setting signal By means of the test setting signal, the reset circuit is electrically disconnected from the circuit block.
- the reset circuit is thus electrically isolated.
- the circuit block is supplied with the reset signal.
- the reset signal is not supplied to the circuit block in the test mode.
- test mode a signal can be supplied to the circuit block that disables the circuit block.
- the adjustable test voltage is supplied via a separate path to the previously isolated reset circuit which generates the reset signal.
- the test voltage is an analog voltage.
- the test voltage may have value continuous voltage values.
- the reset signal is provided as a result signal.
- the result signal is a digital signal.
- the result signal therefore has value-discrete values.
- a dependency of the result signal on the test signal is evaluated.
- at least one threshold value of the reset circuit is determined.
- the reset signal is generated during test and normal operation.
- the reset circuit is testable separately from the circuit block.
- the test voltage undergoes a voltage ramp in the test mode with increasing voltage values for detecting a first threshold value of the reset circuit.
- the first threshold value corresponds to the value of the test voltage at which the result signal changes its logic value.
- the test voltage passes through a voltage ramp with falling voltage values for detection of a second threshold value of the reset circuit.
- the second threshold value corresponds to the value of the test voltage at which the result signal changes its logic value with decreasing voltage values of the test voltage.
- the test voltage runs a voltage ramp with falling voltage values and a voltage ramp with rising voltage values.
- the second threshold is advantageously lower than the first threshold. It is an advantage of such hysteresis that with an input voltage having a value approximately equal to the first threshold, small voltage variations in the input voltage do not already result in changes in the reset signal.
- the circuit arrangement is arranged on a main surface of a semiconductor body.
- the circuit arrangement is arranged on a main surface of exactly one semiconductor body.
- Figure 2 shows an exemplary embodiment of a reset circuit according to the proposed
- FIG. 3A to 3G exemplary waveforms of a circuit arrangement with a reset circuit according to the proposed principle
- FIG. 1A shows an exemplary embodiment of a circuit arrangement with a reset circuit according to the proposed principle.
- the reset circuit 11 comprises a voltage input 12 and an output 13.
- the reset circuit 11 may also be referred to as a power on reset block, abbreviated to POR block.
- the circuit arrangement comprises a changeover switch 14 having a first and a second input 15, 16, a control input 17 and an output 18.
- the output 18 of the changeover switch 14 is connected to the voltage input 12 of the reset circuit 11.
- a first pad 19 of the circuit 10 is connected to the first input 15 of the switch 14. Accordingly, a second pad 20 of the circuit 10 is connected to the second input 16 of the switch 14.
- the circuit arrangement 10 comprises an output logic circuit 21 having a first and a second input 22, 23 and a first and a second output 24, 25.
- the first input 22 of the output logic circuit 21 is connected to the output 13 of the reset circuit 11 is connected.
- the circuit 10 includes a circuit block 26 connected to the first output 24 of the output logic circuit 21.
- the circuit block 26 is additionally connected to the second pad 20.
- the circuit arrangement 10 has an output pad 27, which is coupled to the second output 25 of the output logic circuit 21.
- the circuit arrangement 10 comprises an input logic circuit 28 having an output 29.
- the output 29 is connected to the control input 17 of the changeover switch 14.
- the output 29 of the input logic circuit 28 is connected to the second input 23 of the output logic circuit 21.
- the input logic circuit 28 has a first input 30 coupled to the first output 24 of the output logic circuit 21.
- the input logic circuit 28 has a second input 32 and a third input 31.
- the input logic circuit 28 is implemented as a test mode register.
- the input logic circuit 28 includes a memory circuit 33.
- the memory circuit 33 is implemented as a flip-flop.
- a data output 34 of the memory circuit 33 is connected to the output 29 of the input logic circuit 28.
- a reset input 35 of the memory circuit 33 is connected to the first input 30 of the input logic circuit 28.
- a clock input 36 of the memory circuit 33 is coupled to the third input 31 of the input logic circuit 28.
- a data input 37 of the memory circuit 33 is connected to the second input 32 of the input logic circuit 28.
- the switch 14 comprises a buffer 38 and a first and a second switch 39, 40.
- the buffer fer 38 is connected between the control input 17 of the changeover switch 14 and the control inputs of the first and second switches 39, 40.
- the first switch 39 connects the first input 15 of the changeover switch 14 to the output 18 of the changeover switch 14.
- the second switch 40 connects the second input 16 of the changeover switch 14 to the output 18 of the changeover switch 14.
- the output logic circuit 21 has a third one Input 41, which is connected to the output 18 of the switch 14.
- the output logic circuit 21 has a fourth input 42, which is connected to the second input 16 of the changeover switch 14 and thus to the second connection surface 20.
- a test voltage VTM is supplied to the first input 15 of the change-over switch 14 via the first connection surface 19.
- a supply voltage VBAT is supplied to the second input 16 of the changeover switch 14 via the second connection surface 20.
- the supply voltage VBAT is used to supply the circuit arrangement 10.
- the circuit block 26 is supplied by the supply voltage VBAT.
- the control input 17 of the switch 14 is a Testeinstellsignal TM supplied. Depending on the Testeinstellsignals TM either the first or the second switch 39, 40 is closed, so that alternatively the first or the second input 15, 16 of the changeover switch 14 is connected to the output 18 of the changeover switch 14.
- the voltage applied to the output 18 of the switch 14 voltage is supplied as input voltage VDD the voltage input 12 of the reset circuit 11.
- the input voltage VDD thus corresponds to the supply voltage VBAT or alternatively the test voltage VTM.
- the reset circuit 11 generates a reset signal POR in response to the input voltage VDD. In doing so, the return Set signal POR generated with an activating value, if the input voltage VDD exceeds a first threshold VPH.
- the first threshold value VPH is set such that a supply voltage VBAT having a value greater than the first threshold value VPH is sufficient for the safe operation of the circuit block 26.
- the reset signal POR is supplied via the output 13 of the reset circuit 11 to the first input 22 of the output logic circuit 21.
- the second input 23 of the output logic circuit 21 is supplied with the test setting signal TM.
- the third input 41 of the output logic circuit 21, the input voltage VDD is fed.
- the fourth input 42 is connected to the supply voltage VBAT, which is used to supply the gates of the output logic circuit 21.
- the output logic circuit 21 generates a system reset signal SPOR in response to the reset signal POR and the test set signal TM, and provides the system reset signal SPOR at the first output 24.
- the system reset signal SPOR is supplied to the circuit block 26 and serves to activate the circuit block 26, as long as the supply voltage VBAT has exceeded the first threshold value VPH.
- the output logic circuit 21 provides a result signal TPOR at the second output 25 of the output logic circuit 21.
- the result signal TPOR is realized as a digital signal.
- the result signal TPOR is supplied to the output pad 27.
- An interface, not shown, of the circuit arrangement 10, English: interface, comprises the output terminal surface 27.
- the system reset signal SPOR is additionally applied via the first input 30 of the input circuit arrangement 28 to the reset input 35 of the memory circuit 33 is supplied.
- the memory circuit 33 generates the test set signal TM at the data output 34, which is supplied via the output 29 of the input logic circuit 28 to the switch 18 and the output logic circuit 21.
- a clock signal CLK is supplied via the third input 31 of the input logic circuit 28 to the clock input 36 of the memory circuit 33.
- a data signal SDAT is fed via the second input 32 of the input logic circuit 28 to the data input 37 of the memory circuit 33.
- the memory circuit 33 generates the test setting signal TM in response to the clock signal CLK, the system reset signal SPOR and the data signal SDAT.
- the test setting signal TM and the data signal SDAT are formed as electrical signals.
- the changeover switch 14 is realized as an electronic changeover switch.
- the first and second switches 39, 40 are implemented as electronic switches.
- test adjustment signal TM it can be selected by means of the test adjustment signal TM whether the test voltage VTM or the supply voltage VBAT is fed to the reset circuit 11.
- the test adjustment signal TM is also supplied to the output logic circuit 21, so that during the execution of a test, the system reset signal SPOR has a value which deactivates the circuit block 26.
- the system reset signal SPOR has a value activating the circuit block 26 only if the reset signal POR shows the activating value and the reset circuit 11 is not in test mode.
- the reset circuit 11 is thus isolated from the circuit block 26 by means of the test setting signal TM.
- the result signal TPOR corresponds to the reset signal POR.
- the result signal TPOR has a constant value, if the reset circuit 11 is not in test mode.
- the buffer 38 can be advantageously set that in the absence of a defined Testeinstellsignals TM the second switch 40 is closed and thus the supply voltage VBAT the reset circuit 11 is supplied.
- test mode reset circuit 11 is supplied via a separate supply path including the first switch 39 of the switch 14 and the first pad 19. A measurement of a threshold value of the reset circuit 11 is performed such that a result is output through an output path including the output logic circuit 21 and the output terminal 27.
- the circuit arrangement 10 comprises a multiplexer, the input side to the second output 25 of the output logic circuit 21 and the output side is connected to a pad.
- the pad is thus implemented as a test pad, English: test-mode pin.
- the number of connection areas can thus be kept low and an area of a semiconductor body 130 which comprises the circuit arrangement can be kept small.
- FIG. 1B shows an exemplary embodiment of a circuit arrangement with a reset circuit according to the proposed principle.
- the circuit arrangement 10 'according to FIG IB is a development of the embodiment shown in FIG. 1A and will not be described again here.
- the first switch 39 comprises a first switching transistor 50, which is connected between the first input 15 and the output 18 of the changeover switch 14. A control terminal of the first switching transistor 50 is connected to a first output 51 of the buffer 38.
- the first switch 39 comprises a second switching transistor 52, which is connected in series with the first switching transistor 50.
- the second switching transistor 52 is arranged between the first switching transistor 50 and the output 18 of the changeover switch 14.
- a control terminal of the second switching transistor 52 is also connected to the first output 51 of the buffer 38.
- a node 53 between the first and second switching transistors 50, 52 is connected via a first resistor 54 to the two control terminals of the first and second switching transistors 50, 52.
- the node 53 is also connected to the two substrate terminals of the first and second switching transistors 50, 52.
- the second switch 40 comprises a third switching transistor 55, which is connected between the second input 16 and the output 18 of the changeover switch 14.
- a control terminal of the third switching transistor 55 is connected to a second output 56 of the buffer 38.
- the buffer 38 comprises a first and a second inverters 57, 58, which are connected in series. An input of the first inverter 57 is connected to the control input 17 of the changeover switch 14.
- the buffer 38 has a fourth switching transistor 59, the first output 51 of the buffer 38 and thus the control inputs of the first and the second
- Switching transistor 50, 52 connects to a reference potential terminal 60.
- An output of the first inverter 57 is connected via the second inverter 58 to a control terminal of the fourth Switching transistor 59 connected.
- the buffer 38 has a fifth switching transistor 61 which connects the second input 16 of the changeover switch 14 to the second output 56 of the buffer 38.
- the second output 56 of the buffer 38 is connected to the reference potential terminal 60 via a second resistor 62.
- the output of the first inverter 57 is connected to a control terminal of the fifth switching transistor 61.
- the first, second, third and fifth switching transistors 50, 52, 55, 61 are each realized as a p-channel field-effect transistor.
- the fourth switching transistor 59 is implemented as an n-channel field effect transistor.
- the first, second and third switching transistors 50, 52, 55 each have a high width-to-length ratio, so that their on-resistance is low.
- the circuit arrangement 10 comprises a buffer capacitor 64 which connects the output 18 of the changeover switch 14 to the reference potential terminal 60.
- the reset circuit 11 has a capacitor 65 and a switch 66. In this case, a first electrode of the capacitor 65 via the
- the reset circuit 11 includes first, second, and third terminals 68, 69, 70.
- the first and second terminals 68, 69 are connected to the reference potential terminal 60.
- the third terminal 70 is connected to a substrate bias terminal 71.
- the output logic circuit 21 comprises a first logic gate 72, a first inverter 73, and a second logic gate 74.
- a first input of the first logic gate 72 and a first input of the second logic gate 74 are connected together and connected to the output 13 of the reset circuit 11 via the first logic gate 74 first input 22 of the output logic circuit 21 is coupled.
- a second input of the second logic gate 74 is connected to the second input 23 of the output logic circuit 21.
- a second input of the first logic gate 72 is connected via the first inverter 73 to the second input 23 of the output logic circuit 21.
- the output logic circuit 21 further includes a first level shifter 75, which connects the first input 22 of the output logic circuit 21 to the first two inputs of the first and second logic gates 72, 74.
- the first and second logic gates 72, 74 are implemented as NAND gates.
- the output logic circuit 21 has a third logic gate 77, which is connected at a first input to the output of the first logic gate 72 and at an output to the first output 24 of the output logic circuit 21.
- the third logic gate 77 comprises an inverting function.
- the output logic circuit 21 further includes a second level shifter 78 which connects the third input 41 of the output logic circuit 21 to a second input of the third logic gate 77.
- the third logic gate 77 is also realized as a NAND gate.
- An output of the second logic gate 74 is connected to the second
- Output 25 of the output logic circuit 21 is coupled.
- the output logic circuit 21 includes a second inverter 76 connected between the output of the second logic gate 74 and the second inverter 76 second output 25 of the output logic circuit 21 is connected.
- the fourth switching transistor 59 provides a control signal for the first and second switching transistors 50, 52.
- the fourth switching transistor 59 is provided with the test setting signal TM via the first and second inverters 57, 58 without being inverted. If the test setting signal TM has the logical value 1 and thus a high voltage value, then the fourth switching transistor 59 is turned on. Thus, the control terminals of the first and second switching transistors 50, 52 are connected to the reference potential terminal 60.
- the control signals of the first and the second switching transistor 50, 52 thus correspond to a reference potential VSS, which can be tapped off at the reference potential terminal 60.
- the first and the second switching transistor 50, 52 are thus switched on, so that the voltage applied to the first input 15 of the switch 14 test voltage VTM is provided at the output 18 of the switch 14.
- a substrate voltage is supplied to the two switching transistors 50, 52. If the test setting signal TM has the logical value 0 and thus a low voltage value, then the fourth switching transistor 59 is switched off. In this case, the control terminals of the first and the second switching transistor 50, 52 are positively charged such that the two switching transistors 50, 52 block.
- a current flow to the node 53 can be made, for example, by the first switching transistor 50, when the test voltage VTM is higher than the voltage at the node 53, so that a diode between a first terminal of the first switching transistor 50 and the Substrate terminal of the first switching transistor 50 passes.
- a charging of the control terminals of the first and the second switching transistor 50, 52 via the second switching transistor 52 can also take place, provided that a voltage at the output 18 of the changeover switch 14 is higher than the voltage at the node 53.
- the current can flow, for example, through a diode between a terminal of the second switching transistor 52 and the substrate terminal of the second switching transistor 52.
- charging can be effected by subthreshold currents of the two switching transistors 50, 52.
- the first and second switching transistors 50, 52 thus do not require external substrate voltage provided by a substrate voltage source.
- test setting signal TM has the logic value 1
- the logic value 0 can be tapped off at the output of the first inverter 57, so that the fifth switching transistor 61 is turned on.
- the control terminal of the third switching transistor 55 is connected to the second input 16 of the switch 14. If the supply voltage VBAT is at a high value at the second input 16, the third switching transistor 55 is thereby switched to blocking. If, on the other hand, the test setting signal TM has the logical value 0, then the logical value 1 can be tapped off at the output of the first inverter 57, which switches the fifth switching transistor 61 in a blocking state.
- the control terminal of the third switching transistor 55 is connected to the reference potential VSS via the resistor 62, so that the third switching transistor 55 is turned on.
- the supply voltage VBAT provided at the second input 16 of the changeover switch 14 is output at the output 18 of the changeover switch 14 by means of the third switching transistor 55.
- the buffer capacitor 64 serves to buffer the input voltage VDD, which is applied to the voltage input 12 of the reset circuit 11.
- the capacitor 66 of the reset circuit 11 is for setting a time constant with which the reset signal POR is provided. In order to be able to test the function of the reset circuit 11 more quickly in test mode, the control input of the
- Switch 66 supplied the Testeinstellsignal TM and deactivated by means of the switch 66 of the capacitor 65.
- the reset circuit 11 provides the reset signal with the voltage value of the input voltage VDD at low values of the input voltage VDD. If the input voltage VDD exceeds a first threshold value VPH, the reset signal POR assumes the voltage value 0 V and thus a first logical value. If the reset signal POR has the voltage value of the input voltage VDD, then the reset signal POR has a second logical value. The first logical value is 0 and the second logical value is 1.
- the result signal TPOR has the logic value 1 only if the test setting signal TM and the reset signal POR have the logic value 1. In all other cases, the result signal has the logical value 0.
- the system reset signal SPOR has the logic value 1 if the test setting signal TM has the logical value 0 and the reset signal POR has the logic value 1.
- the first level shifter 75 increases the reset signal POR so that a derived reset signal POR1 can be tapped off at the output of the first level shifter.
- the logical value 1 of the derived reset signal POR1 thus corresponds to a voltage value of the supply voltage VBAT.
- the voltage value of the input voltage VDD and thus the voltage value of the test voltage VTM would be fed to the first and the second logic gate 72, 74 as logic value 1 during test operation.
- the output logic circuit 21 is supplied in test mode as well as in an operating state without test operation of the supply voltage VBAT.
- the first level shifter 75 it is achieved that a logical value 1 of the reset signal POR is recognized even with a small voltage value of the reset signal POR from the first and the second logic gates 72, 74 with improved accuracy.
- the two level shifters 75, 78 are thus advantageous for the test operation.
- the feedback of the system reset signal SPOR to the input logic circuit 28 causes the test set signal TM to have the logic value 0 if the system reset signal SPOR shows the logical value 1. Only when the supply voltage VBAT has exceeded the first threshold value VPH and therefore the system reset signal SPOR has the logical value 0 can a test mode be started by means of the data signal SDAT and the clock signal CLK and the test set signal TM be set to the logical value 1.
- the result signal TPOR does not show the logical value 1 even with low values of the test voltage VTM. If the third switching transistor 55 has a defect in this way in that it can not be switched into a conductive operating state, the system reset signal SPOR does not have the logical value 1 in any operating state. has the fifth switching transistor 61 has a defect in the form of a short circuit, so the third switching transistor 61 can not be turned on and the system reset signal SPOR always has the logic value of 1.
- the third switching transistor 55 is always turned on, so that the input voltage VDD is different from the supply voltage VBAT and the test voltage VTM - hangs.
- a first voltage source provides the supply voltage VBAT.
- a second voltage source provides the test voltage VTM.
- the one of the two voltage sources which has the smaller internal resistance, adjusts the input voltage VDD via the internal resistances of the voltage sources and the switch resistors. If, for example, the first voltage source has a lower internal resistance than the second voltage source, the result signal TPOR is independent of the value of the test voltage VTM and has the logical value 0.
- a delay time can be set by means of the capacitor 65, with which the reset signal POR is provided.
- the capacitor 65 can be separated from a signal path by means of which the reset signal POR is generated. In test mode, therefore, the reset signal POR is generated without delay by the capacitor 65.
- the first logical value is 1 and the second logical value is 0.
- the output logic circuit 21 may comprise other logic gates and / or another logic that implement the same logic function as the output logic circuit 21 shown.
- one or more of the NAND gates may be replaced by a NOR gate with upstream and downstream inverters.
- the first switch 39 may be realized as a transmission gate.
- FIG. 2 shows an exemplary embodiment of a reset circuit as may be used in the circuit arrangements according to Figures IA and IB.
- the reset circuit 11 has a deactivation circuit 91, an evaluation circuit 92, a delay circuit 93 and the output driver 67.
- the reset circuit 11 and thus the four circuits 91, 92, 93, 67 are connected between the voltage input 12 and the reference potential terminal 60.
- the deactivating circuit 91 has two inverters 95, 96 connected in series, which each connect the voltage input 12 to the reference potential terminal 60.
- An input of a first inverter 95 is connected to the second terminal 69 of the reset circuit 11.
- An output of the first inverter 95 is connected to an input of the second inverter 96.
- An output of the second inverter 96 is connected to an input 97 of the evaluation circuit 92.
- the evaluation circuit 92 comprises a first current mirror 98 having a first and a second current mirror transistor 99, 101.
- the two current mirror transistors 99, 101 are connected to the voltage input 12 at a first terminal.
- a control terminal of the first current mirror transistor 99 is connected to a second terminal of the first current mirror transistor 99 and to a control terminal of the second current mirror transistor 101.
- the evaluation circuit 92 comprises a turn-off transistor 100, English power down transistor.
- a first terminal of the turn-off transistor 100 is connected to the voltage input 12.
- the control terminal of the first current mirror transistor 99 is connected to a second terminal of the turn-off transistor 100.
- a control terminal of the turn-off transistor 100 is connected via a further input 120 of the evaluation circuit 92 to the output of the first inverter 95.
- the first current mirror transistor 99 is connected to the reference potential terminal 60 via a first transistor 102.
- the first current mirror transistor 99 and the first transistor 102 together form a voltage divider for the input voltage VDD.
- a control terminal of the first transistor 102 is connected to the input 97 of the evaluation circuit 92.
- a second terminal of the second current mirror transistor 101 is connected to the reference potential terminal 60 via a series circuit comprising a second and a third transistor 103, 104.
- the second terminal of the second current mirror transistor 101 is coupled to the reference potential terminal 60 via a fourth transistor 105.
- the second terminal of the second current mirror transistor 101 is connected to a first input 106 of the delay circuit 93.
- a second current mirror 107 includes the third and fourth transistors 104, 105 and a fifth transistor
- a first terminal of the third, fourth and fifth transistors 104, 105, 108 is connected to the reference potential terminal 60.
- a control terminal of the fifth Transistor 108 is connected to a control terminal of the fourth transistor 105 and a control terminal of the third transistor 104 and to a second terminal of the fifth transistor 108.
- the fifth transistor 108 is coupled to the voltage input 12 via a sixth transistor 109.
- a control terminal of the sixth transistor 109 is connected to the input 97 of the evaluation circuit 92.
- the second terminal of the fifth transistor 108 is connected to a second input 110 of the delay circuit 93.
- the delay circuit 93 has seventh, eighth and ninth transistors 111, 112, 113.
- a control terminal of the seventh and eighth transistors 111, 112 is connected to the first input 106 of the delay circuit 93.
- a control terminal of the ninth transistor 113 is connected to the second input 110 of the delay circuit 93.
- the seventh, eighth and ninth transistors 111, 112, 113 are connected in series with each other.
- a node 119 between the seventh and the eighth transistor 111, 112 is connected via a further input 114 of the evaluation circuit 92 to a control terminal of the second transistor 103.
- the second current mirror 107 likewise comprises the ninth transistor 113.
- the node 119 between the seventh and the eighth transistor 111, 112 is connected to the voltage input 12 via the capacitor 65.
- the capacitor 65 is realized by means of a field effect transistor.
- the first and second current mirror transistors 99, 101, the turn-off transistor 100 and the first, sixth and seventh transistors 102, 109, 111 are each realized as a p-channel field-effect transistor.
- the second, third, fourth, fifth, eighth and ninth transistors 103, 104, 105, 108, 112, 113 are each implemented as an n-channel field effect transistor.
- the node 119 between the seventh and eighth transistors 111, 112 is connected to an input 115 of the output driver 67.
- the output driver 67 comprises a third and a fourth inverter 116, 117.
- An input of the third inverter 116 is connected to the input 115 of the output driver 67.
- An output of the third inverter 116 is connected to an input of the fourth inverter 117 and an additional output 118 of the reset circuit 11.
- An output of the fourth inverter 117 is connected to the output 13 of the reset circuit 11.
- a switch-off signal PD is fed via the input 69 of the reset circuit 11 of the deactivating circuit 91 and delayed by means of the first and the second inverter 95, 96 as a derived shutdown signal PDB to the input 97 of the evaluation circuit 92.
- an inverted shutdown signal PDN can be tapped off.
- the first transistor 102 and the first current mirror transistor 99 have the same conductivity type.
- the control terminal of the turn-off transistor 100, the inverted shutdown signal PDN is supplied. If the derived turn-off signal PDB has the logic value 1, the first transistor 102 is thus switched off, so that no current flows through the first and second current mirror transistors 99, 101.
- the inverted shutdown signal PDN has the logical value 0, so that the turn-off transistor 100 is turned on.
- the control terminal of the second current mirror transistor 101 is thus approximately the value of the input voltage VDD.
- the sixth transistor 109 is turned off, so that at the second input 110 of the delay circuit 93, the logic value 0 is applied. If, however, the inverted switch-off signal PDN has the logic value 1, then the switch-off transistor 100 does not conduct. In this case, the derived turn-off signal PDB has the logic value 0, so that the first transistor 102 conducts.
- the second current mirror transistor 101 outputs a current in which a first part flows through the series circuit of the second and the third transistor 103, 104 and a second part through the fourth transistor 105. If the delayed switch-off signal PDB has the logic value 0, then a current flows through the sixth transistor 109 and thus through the fifth transistor 108. Since the fifth transistor 108 together with the third and the fourth transistor 104, 105, the second current mirror 107th In this case, a current also flows through the third and the fourth transistor 104, 105. According to the current flows through the first and the second current mirror 98, 107, a voltage VAR, which is the seventh, adjusts at the first input 106 of the delay circuit 93 and the eighth transistor 111, 112 are supplied.
- VAR which is the seventh
- a voltage VDI at the second input 110 of the delay circuit 93 is so high that the ninth transistor 113 is turned on. If the voltage VAR is low, the seventh transistor 111 is turned on and a voltage VCAP, which is applied to the capacitor 65 and thus to the input 115 of the output driver 67, approximately to the value of the input voltage VDD.
- the voltage VCAP is supplied to the third inverter 116, so that at the additional output 118 of the reset circuit 11 an inverted reset signal POR_N with a low voltage value and thus the logic value 0 is delivered.
- the reset signal POR is provided with the value of the input voltage VDD and thus the logical value 1.
- the second transistor 103 is driven to set a hysteresis of the evaluation circuit 92. If the voltage VAR has such a high value that the seventh transistor 111 is turned off and the eighth transistor 112 is turned on, then a charge flows from the capacitor 65 via the eighth and ninth transistors 112, 113.
- the voltage VCAP decreases, so that the inverted reset signal POR_N a high voltage value and thus the logic value 1 and the reset signal POR assumes a low voltage value and thus the logic value 0.
- the reset signal POR of the logic value 1 to the logical value 0 in response to the set by the evaluation circuit 92 threshold VPH over.
- the voltage VCAP is supplied to the control terminal of the second transistor 103.
- the second transistor 103 is turned on, so that the voltage VAR assumes a lower value than in the case of a low value of the voltage VCAP and a logic value 0 of the reset voltage POR.
- the reset circuit 11 generates the reset signal POR automatically and without supply of a reference current or reference voltage to be provided by a source not included in the reset circuit.
- Means of a logic value 1 of the switch-off signal PD can advantageously the reset signal POR to the logical value of 1 be set independently of a level of the input voltage VDD.
- the capacitor 65 is connected via the switch 66 to the voltage input 12.
- the switch 66 is designed as a transistor.
- the capacitor 65 is realized as an integrated capacitor.
- the capacitor comprises two electrodes and an intervening dielectric.
- the capacitor may be free of a monocrystalline substrate material of the semiconductor body 130.
- FIG. 3A to 3G show exemplary signal waveforms in a circuit arrangement with a reset circuit according to the proposed principle as a function of a time t.
- FIG. 3A shows the derived reset signal POR1
- FIG. 3B shows the test setting signal TM
- FIG. 3C shows the reset signal POR.
- the input voltage VDD, the supply voltage VBAT and the test voltage VTM are shown.
- FIG. 3E shows the system reset signal SPOR
- FIG. 3F shows the result signal TPOR.
- the supply voltage VBAT rises from a value 0 volts to a value of approximately 2.5 volts.
- the reset signal POR and the derived reset signal POR1 rise in the first phase A from 0 volts to about 2.2 volts. Since the test setting signal TM has the logical value 0, the test setting signal TM has the logical value 0.
- the system reset signal SPOR also increases from 0 volts to approximately 2.2 volts, while the result signal TPOR has the value 0.
- the supply voltage VBAT continues to rise to a value of 4 volts and then remains constant.
- the reset signal POR and the derived reset signal PORl become 0 volt.
- the system reset signal SPOR also has the value 0 volts, while the result signal TPOR continues to indicate 0 volts.
- the supply voltage VBAT is constant in the other phases and remains at the value 4 volts.
- the test voltage VTM has the value 0 volts.
- the test voltage VTM is turned on and rises from a value of 3 volts until it reaches 4 volts in a third phase C between the second time t2 and a third time t3.
- the test setting signal TM is set to logic 1.
- the test voltage VTM decreases linearly, so that at a time tu a second threshold value VPL of the reset circuit 11 is reached.
- the reset voltage POR jumps from the value 0 volts to a value of approximately 2 volts, which corresponds to the value of the test voltage VTM and thus to the value of the input voltage VDD at the instant tu.
- the derived reset voltage POR1 assumes a value of approximately 4 volts and the result signal TPOR also assumes the value 4 volts.
- the test voltage VTM and thus the input voltage VDD increases linearly from a value of approximately 1.6 volts to 3 volts.
- the input voltage VDD exceeds the first threshold value VPH, so that the reset voltage POR, the derived reset voltage POR1 and the result signal TPOR are again lowered to 0 volts.
- the reset voltage POR follows the course of the input voltage VDD.
- the derived reset voltage POR1 and the result signal TPOR approximately have the value 4 volts in the period between the time tu and the time to.
- the test setting signal TM has the logical value 0 instead of the logical value 1.
- the supply voltage VBAT is still at the value 4 volts.
- the reset signal POR, the derived reset signal POR 1, the system reset signal SPOR and the result signal TPOR are at the value 0 volts and have the logic value 0.
- the time tu and the time to is drawn in more detail.
- a hysteresis H is shown, which lies between the second threshold value VPL and the first threshold value VPH.
- the value of the hysteresis H is about 0.2 volts.
- the second threshold value VPL which is effective when the input voltage VDD decreases, has a value smaller by the value of the hysteresis H than the first threshold value VOPRH, which is effective when the input voltage VDD rises.
- FIG. 4 shows an exemplary embodiment of a semiconductor body with the circuit arrangement according to the proposed principle.
- the semiconductor body 130 comprises the circuit arrangement 10 ".
- the circuit arrangement 10 " may, for example, be realized in accordance with the embodiments shown in FIG. 1A or FIG. 1B.
- FIG. 4 shows a further development of the embodiment shown in FIG. 1A by way of example.
- the circuit arrangement 10 is arranged on a first main surface 134 of the semiconductor body 130.
- the circuit arrangement 10 includes a control pad 131.
- the control pad 131 is connected to the second input 32 of the input logic circuit 28.
- the circuit arrangement 10 comprises a clock pad 132.
- the clock pad 132 is connected to the third input 31 of the input logic circuit 28.
- the circuit arrangement 10 comprises an additional connection surface 133.
- the additional connection surface 133 is coupled to the circuit block 26.
- the data signal SDAT can be tapped off.
- the clock signal CLK can be tapped off at the clock pad 132.
- signals generated in the circuit block 26 may be output or signals may be supplied to the circuit block 26.
- the first and the second pad 19, 20, the control pad 131, the clock pad 132, the output pad 27 and the additional pad 133 may be contacted from outside the semiconductor body 130.
- the aforementioned connection surfaces 19, 20, 27, 131, 132, 133 can be contacted in a test operation by means of test needles for the duration of the test.
- a Waferprober with a test card which includes the test needles, and an electrical measuring device for delivering the Signals and voltages and used to record the signals and voltages.
- connection surfaces mentioned can be contacted in a housing process, for example by means of bonding wires or by means of solder balls, English bumps.
- the abovementioned connection surfaces can be connected, for example, to a housing or a printed circuit board.
- a first circuit is connected between the control pad 131 and the second input 32 of the input logic circuit 28.
- between the clock pad 132 and the third input 31 of the input logic circuit 28 may be arranged a second circuit.
- the circuit arrangement 10 " is produced on the semiconductor body 130 by means of a complementary metal-oxide-semiconductor integration technique, abbreviated to CMOS technology.
- CMOS complementary metal-oxide-semiconductor
- the circuit arrangement 10 " can be realized by means of a bipolar integration technique.
- the circuit arrangement 10 " may be produced by means of a combined bipolar CMOS integration technique, abbreviated to BiCMOS technology.
- the semiconductor body 130 may comprise silicon or silicon germanium as the substrate material. LIST OF REFERENCE NUMBERS
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Semiconductor Integrated Circuits (AREA)
- Tests Of Electronic Circuits (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020107017654A KR101148345B1 (ko) | 2008-01-10 | 2009-01-09 | 리셋 회로 테스트용 회로 장치 및 방법 |
| US12/812,581 US8564323B2 (en) | 2008-01-10 | 2009-01-09 | Circuit arrangement and method for testing a reset circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008003819.9 | 2008-01-10 | ||
| DE102008003819.9A DE102008003819B4 (de) | 2008-01-10 | 2008-01-10 | Schaltungsanordnung und Verfahren zum Testen einer Rücksetzschaltung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2009100802A2 true WO2009100802A2 (de) | 2009-08-20 |
| WO2009100802A3 WO2009100802A3 (de) | 2009-10-22 |
Family
ID=40578496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2009/000086 Ceased WO2009100802A2 (de) | 2008-01-10 | 2009-01-09 | Schaltungsanordnung und verfahren zum testen einer rücksetzschaltung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8564323B2 (de) |
| KR (1) | KR101148345B1 (de) |
| DE (1) | DE102008003819B4 (de) |
| WO (1) | WO2009100802A2 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5852537B2 (ja) * | 2012-09-25 | 2016-02-03 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
| US10291146B2 (en) * | 2017-03-30 | 2019-05-14 | Infineon Technologies Ag | Gate driver circuit for a rectifier device including a cascade of transistor stages |
| CN108132434A (zh) * | 2017-12-14 | 2018-06-08 | 上海贝岭股份有限公司 | Por电路的测试系统及集成电路 |
| JP7297658B2 (ja) * | 2019-12-25 | 2023-06-26 | アルプスアルパイン株式会社 | リセット装置、回路装置及びリセット方法 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4849681A (en) * | 1987-07-07 | 1989-07-18 | U.S. Philips Corporation | Battery-powered device |
| US6473852B1 (en) * | 1998-10-30 | 2002-10-29 | Fairchild Semiconductor Corporation | Method and circuit for performing automatic power on reset of an integrated circuit |
| IT1319820B1 (it) * | 2000-01-28 | 2003-11-03 | St Microelectronics Srl | Circuito di reset di accensione a basso consumo per memorie asemiconduttore |
| US6794946B2 (en) * | 2000-05-22 | 2004-09-21 | Ramin Farjad-Rad | Frequency acquisition for data recovery loops |
| JP2002123501A (ja) | 2000-10-17 | 2002-04-26 | Mitsubishi Electric Corp | 半導体集積回路 |
| CN100437133C (zh) * | 2004-08-19 | 2008-11-26 | 鸿富锦精密工业(深圳)有限公司 | 低电压重置功能检测电路 |
| TWI244261B (en) * | 2004-11-25 | 2005-11-21 | Sunplus Technology Co Ltd | Power on reset circuit |
| KR20070076080A (ko) | 2006-01-17 | 2007-07-24 | 삼성전자주식회사 | 반도체 메모리 장치의 테스트 장치 및 테스트 방법 |
| US7710105B2 (en) * | 2006-03-14 | 2010-05-04 | Atmel Corporation | Circuit reset testing methods |
| US7519486B2 (en) * | 2006-03-31 | 2009-04-14 | Atmel Corporation | Method and apparatus to test the power-on-reset trip point of an integrated circuit |
-
2008
- 2008-01-10 DE DE102008003819.9A patent/DE102008003819B4/de not_active Expired - Fee Related
-
2009
- 2009-01-09 KR KR1020107017654A patent/KR101148345B1/ko not_active Expired - Fee Related
- 2009-01-09 US US12/812,581 patent/US8564323B2/en not_active Expired - Fee Related
- 2009-01-09 WO PCT/EP2009/000086 patent/WO2009100802A2/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US20110025365A1 (en) | 2011-02-03 |
| DE102008003819B4 (de) | 2015-06-18 |
| DE102008003819A1 (de) | 2009-07-23 |
| US8564323B2 (en) | 2013-10-22 |
| KR101148345B1 (ko) | 2012-05-21 |
| WO2009100802A3 (de) | 2009-10-22 |
| KR20100110360A (ko) | 2010-10-12 |
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