SU978085A1 - Device for checking integrated circuit contacting - Google Patents

Description

ha and increase the reliability of control.

The goal is achieved by the fact that the device for controlling the contacting of integrated circuits, which contains a parameter meter, 5 is connected by the first input through normally closed contacts of the first relay contact group and the first probe to the first output of the integrated circuit connected by the second output to the common 10 bus device, third terminals through the second probes and the corresponding normally closed contacts of the second relay contact groups - with the second inputs of the parameter meter, voltage source 5, connected by the outputs via p Sistors with corresponding normally open contacts of the second relay contact groups, triggers connected to the outputs with corresponding 2d inputs of the NRN-NI element, two-threshold discriminators, display element, NAND element, first and second delay elements, AND elements, .odonibrator and the button connected to the first pin with the common bus of the device, the second pin from the first inputs of the triggers, the first delay element and the one-shot connected to the output directly to the relay coil, and through the second delay element with the first input of the IT-NOT element connected by the output to the third input of the meter, parameters, the second input to the output of the OR-NOT element connected by the inputs to the corresponding 35 inputs of the display element, the second inputs of the triggers are connected to the outputs of the corresponding And elements connected by the first inputs to the outputs the first delay element, the second 40 inputs through the corresponding two-threshold discriminators - with normally open contacts of the second relay contact groups.

The drawing shows the structure-45 of the electrical circuit of the device for controlling contacting of the Internet. grail schemes.

The device contains the tested IC 1, probes 2 or contacts 2 of the boat-jQ node) according to the number of contact pads of IC 1 (IC outputs 1), relay 3, meter 4 parameters, resistors 5, voltage source b, double-threshold 1 discriminators 7.1 the elements AND 8, the trigger 9, the indicator 10, the element OR NOT 11, the one-shot 12, the first 13 and second 14 delay elements, the element NOT 15 and the Start button 16.

The device works as follows.

When controlling the contact of the IC, the contact pads of the structures on the plate (Svyvody ready-made ICs) for connecting the power supply of the IC are short-circuited to the housing and the rest 65

The IC outputs are divided into two groups depending on the type of the output transistor channel (polarity of the protective diode connection) and connected through current-limiting resistors

5k to the opposite source outputs

6 in order to ensure the open state of this transistor (direct diode-offset;; when a short-circuit monitored output to the common bus at the input of the two-threshold discriminator 7; 1 there is zero potential level, in the absence of a contract, High potential (equal to

source voltage 6), and if there is contact for a serviceable IC, the potential is low. In the first two cases, a logical one is set at the output of the two-threshold discriminator 7, and in the third case - a logical zero. The low potential level is bounded above and below and is set independently for the IC output.

After lowering the probes 2, onto the IC pads 1 and pressing the Start 16 button, the one-shot 12 starts, the delay element 13 is started and the flip-flops 9 and the indicator 10 are reset. During the pulse of the one-shot 12, the winding 3 is energized, its contacts are activated, connecting IC 1 to the voltage source b through the resistors 5 and to the inputs of the two threshold discriminators 7, which analyze the potential levels at the outputs of the chip 1. After a time of reliable operation of the relay 3 and transient processes in two The threshold discriminators 7 at the output of the first delay element 13 appear a short positive pulse arriving at the gate gate of the elements of AND 8. If by this point in time at the output of at least one of the two threshold discriminators 7 there is a logical unit, the corresponding trigger 9 is activated, the number of the broken non-corrupted output, the logical zero level comes to the input of the I-IV 15 element through the OR-NOT 11 element, prohibiting the subsequent launch of the 4-parameter meter. If at the outputs of all the two threshold discriminators 7 a logical zero is set, the triggers 9 remain in the initial state, np the output of the OR-NOT 11 element is a logical one. On the falling edge of the one-shot pulse 12, it starts with the second delay element 14, on the output — which, after the release time of the contacts of relay 3, a short positive pulse arrives, coming through the IS 15 element to the enable input

Claims (1)

Claim A device for monitoring the contacting of integrated circuits, comprising a parameter meter connected by the first input through normally closed contacts of the first group of relay contacts and the first probe with the first output of the integrated circuit connected by the second terminal to the device common bus, third terminals through the second probes and corresponding normally closed contacts of the second groups of relay contacts - with the second inputs of the parameter meter, a voltage source connected by outputs through resistors with the corresponding normally contacts-mentioned second group of relay contacts, triggers ^ outputs connected to the corresponding inputs of the OR-HE,. about t_ which is characterized in that, with - in order to increase the reliability of contact control and expand the functionality of the device, two-threshold discriminators, an ’indication element, an element are introduced into it 10 AND NOT, the first and second delay elements, AND elements, a single vibrator and a button connected to the first output of the device’s common bus, a second output to the first inputs of the triggers, the first 15 delay element and a single vibrator connected by the output directly to the relay coil, and through the second delay element - with the first input of the AND-NOT element connected by the 2Q output to the third input of the parameter meter, the second input - with the output of the OR-HE element connected by the inputs with the corresponding inputs of the indication element, the second inputs of the triggers are connected. 25 yen with the outputs of the corresponding AND elements connected by the first inputs to the output of the first delay element, by the second inputs through the corresponding double-threshold discriminators · with normally open contacts ’of the second groups of relay contacts.