CN209343292U - A kind of memory VTT circuit applied to desk-top mainboard - Google Patents
A kind of memory VTT circuit applied to desk-top mainboard Download PDFInfo
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- CN209343292U CN209343292U CN201920319487.8U CN201920319487U CN209343292U CN 209343292 U CN209343292 U CN 209343292U CN 201920319487 U CN201920319487 U CN 201920319487U CN 209343292 U CN209343292 U CN 209343292U
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Abstract
The utility model discloses a kind of memory VTT circuits applied to desk-top mainboard, it includes transient voltage suppressor, bleeder circuit and external power supply, the transient voltage suppressor has input pin, output pin and reference voltage pin, the external power supply is connected to the input pin, the external power supply is connected to the reference voltage pin by bleeder circuit, the output pin forms conditioner outlet end, exports VTT voltage, is connected to the VTT pin of DDR3 memory.The utility model exports VTT voltage by the cooperation of bleeder circuit and transient voltage suppressor, is connected to the VTT pin of DDR3 memory, can inhibit to transient voltage, obtains accurately VTT voltage, ensures the normal operation of memory.
Description
Technical field
The utility model relates to power circuit technical field more particularly to a kind of memory VTT applied to desk-top mainboard
Circuit.
Background technique
VTT (Tracking Terminal Voltage monitors final voltage) is AGTL bus termination voltage, is CPU
One top characterising parameter, memory, which using VTT voltage plays the role of pull-up, to be compared with reference voltage relatively and determines low and high level.Memory
VTT voltage is generally the half of the main supply voltage of memory, existing processing mode be by main supply voltage through a triode or
Double metal-oxide-semiconductors are converted to VTT voltage, although this mode is simple, its value is inaccurate, under transient voltage impact, have
Biggish fluctuating, to influence the normal use of memory.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of applied to desk-top mainboard
Memory VTT circuit is applied in desk-top mainboard, exports VTT electricity by the cooperation of bleeder circuit and transient voltage suppressor
Pressure, is connected to the VTT pin of DDR3 memory, can inhibit to transient voltage, obtains accurately VTT voltage, in guarantee
The normal operation deposited.
The purpose of this utility model adopts the following technical scheme that realization:
A kind of memory VTT circuit applied to desk-top mainboard comprising transient voltage suppressor, bleeder circuit and outer
Power supply is connect, the transient voltage suppressor has input pin, output pin and reference voltage pin, and the external power supply connects
It is connected to the input pin, the external power supply is connected to the reference voltage pin, the output pin by bleeder circuit
Conditioner outlet end is formed, VTT voltage is exported, for the VTT pin powered for DDR3 memory.
Further, the transient voltage suppressor is chip UP0109PSW8.
Further, the bleeder circuit includes resistance PR105 and resistance PR106, and the external power supply passes sequentially through electricity
It is grounded after resistance PR105 and resistance PR106, the reference voltage pin is connected between resistance PR105 and resistance PR106.
Further, capacitor PC59 is also connected on the input pin, one end of the capacitor PC59 is connected to input
Between pin and external power supply, the other end of the capacitor PC59 is grounded；Capacitor is also connected on the reference voltage pin
PC71, one end of the capacitor PC71 are connected between reference voltage pin, resistance PR105 and resistance PR106, the capacitor
The other end of PC71 is grounded.
Further, the memory VTT circuit further includes bias supply, and the bias supply is connected to transient voltage inhibition
The power end of device.
Further, input filter circuit is also connected on the bias supply, the input filter circuit includes capacitor
One end after PC67 and capacitor PC73, the capacitor PC67 and capacitor PC73 are in parallel connects between bias supply and power end, and
Other end ground connection after connection.
Further, the conditioner outlet end is also connected with output filter circuit, and the output filter circuit includes electricity
Hold C341, capacitor PC69 and capacitor PC70, the capacitor C341, capacitor PC69 and capacitor PC70 is in parallel, one end after parallel connection connects
It is connected between conditioner outlet end and output pin, the other end ground connection after parallel connection.
Further, the output voltage of the external power supply is 1.5V DC voltage, and the conditioner outlet end generates
The direct current VTT voltage of 0.75V.
Compared with prior art, the utility model has the beneficial effects that: the utility model passes through bleeder circuit and moment electricity
It presses the cooperation of suppressor to export VTT voltage, is connected to the VTT pin of DDR3 memory, transient voltage can be inhibited, be obtained
Accurately VTT voltage is taken, ensures the normal operation of memory.
Detailed description of the invention
Fig. 1 is the schematic diagram for the memory VTT circuit that the utility model is applied to desk-top mainboard.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
It please refers to shown in Fig. 1, a kind of memory VTT circuit applied to desk-top mainboard, is desktop computer motherboard circuit
A part.Memory VTT circuit includes transient voltage suppressor, bleeder circuit and external power supply, and transient voltage inhibits utensil
There are input pin, output pin and reference voltage pin, external power supply is connected to input pin, and external power supply passes through partial pressure electricity
Road is connected to reference voltage pin, and output pin forms conditioner outlet end by lead, exports VTT voltage, for being DDR3
The VTT pin powered of memory.
Transient voltage suppressor uses chip UP0109PSW8, above-mentioned input pin, output pin and reference voltage
Pin respectively corresponds the first pin, the 4th pin and third pin of chip UP0109PSW8.Bleeder circuit uses electric resistance partial pressure
Mode so that reference voltage pin input 0.75V DC voltage, thus ensure that conditioner outlet end also output phase for
The DC voltage of 0.75V, in the utility model preferred embodiment, external power supply uses the power supply of DDR3 memory, i.e.,
1.5V DC power supply, therefore, bleeder circuit are divided using the resistance of two similar resistances, preferable in the utility model
Embodiment in, for bleeder circuit using resistance PR105 and resistance the PR106 composition for being 10K Ω, external power supply passes sequentially through electricity
It is grounded after resistance PR105 and resistance PR106, reference voltage pin is connected between resistance PR105 and resistance PR106.
External power supply input decline or resistance PR105 and resistance PR106 transition in order to prevent, it is preferable in the utility model
Embodiment in, the input voltage of input voltage (i.e. external power supply) and reference voltage input pin to input pin is (i.e.
The DC voltage of above-mentioned 0.75V) it is filtered.
It is capacitor PC59 that filter circuit is connected on input pin, and one end of capacitor PC59 is connected to input pin and external
Between power supply, the other end of capacitor PC59 is grounded.The filter circuit connected on reference voltage pin is capacitor PC71, capacitor PC71
One end be connected between reference voltage pin, resistance PR105 and resistance PR106, the other end of capacitor PC71 ground connection.Capacitor
PC59 uses the capacitor of big capacitance, low ESR as far as possible, and capacitor PC59 is as close possible to input pin.Likewise, capacitor PC71
As far as possible using big capacitance, the capacitor of low ESR, capacitor PC71 is as close possible to reference voltage input pin.
The power end of chip UP0109PSW8 is the 5th to the 8th pin, these pins are connected to bias supply, biased electrical
Source provides driving voltage for chip UP0109PSW8, so that the vcntl that chip UP0109PSW8 output current driving ability matches,
Ground terminal (second pin and the 9th pin) processing from power end to chip UP0109PSW8 outputs current to greatly the electricity of few 1 μ F
Hold, the input voltage of input pin should keep below or be equal to vcntl.Input filter circuit is also connected on bias supply, it is defeated
Entering filter circuit includes capacitor PC67 and capacitor PC73, one end after capacitor PC67 is in parallel with capacitor PC73 connect bias supply with
Other end ground connection between power end, after parallel connection.Using the charge-discharge characteristic of capacitor, reduce ripple, makes the direct current of input
Press (output voltage of bias supply is here 5V DC voltage) relatively stable.
Conditioner outlet end is also connected with output filter circuit, output filter circuit include capacitor C341, capacitor PC69 and
Capacitor PC70, capacitor C341, capacitor PC69 and capacitor PC70 are in parallel, and one end after parallel connection is connected to conditioner outlet end and output
Other end ground connection on lead between pin, after parallel connection.It agrees to it is the charge-discharge characteristic using capacitor, reduces ripple,
Keep the DC voltage (VTT voltage) of output relatively stable.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (8)
1. a kind of memory VTT circuit applied to desk-top mainboard, which is characterized in that it includes transient voltage suppressor, partial pressure
Circuit and external power supply, the transient voltage suppressor has input pin, output pin and reference voltage pin, described
External power supply is connected to the input pin, and the external power supply is connected to the reference voltage pin, institute by bleeder circuit
It states output pin and forms conditioner outlet end, export VTT voltage, be connected to the VTT pin of DDR3 memory.
2. being applied to the memory VTT circuit of desk-top mainboard as described in claim 1, which is characterized in that the transient voltage
Suppressor is chip UP0109PSW8.
3. being applied to the memory VTT circuit of desk-top mainboard as claimed in claim 1 or 2, which is characterized in that the partial pressure electricity
Road includes resistance PR105 and resistance PR106, and the external power supply is grounded after passing sequentially through resistance PR105 and resistance PR106, institute
Reference voltage pin is stated to be connected between resistance PR105 and resistance PR106.
4. being applied to the memory VTT circuit of desk-top mainboard as claimed in claim 3, which is characterized in that the input pin
On be also connected with capacitor PC59, one end of the capacitor PC59 is connected between input pin and external power supply, the capacitor
The other end of PC59 is grounded；Capacitor PC71 is also connected on the reference voltage pin, one end of the capacitor PC71 is connected to
Between reference voltage pin, resistance PR105 and resistance PR106, the other end of the capacitor PC71 is grounded.
5. being applied to the memory VTT circuit of desk-top mainboard as claimed in claim 1 or 2, which is characterized in that the memory
VTT circuit further includes bias supply, and the bias supply is connected to the power end of transient voltage suppressor.
6. being applied to the memory VTT circuit of desk-top mainboard as claimed in claim 5, which is characterized in that the bias supply
On be also connected with input filter circuit, the input filter circuit include capacitor PC67 and capacitor PC73, the capacitor PC67 and
One end connection bias supply after capacitor PC73 is in parallel and the other end ground connection between power end, after parallel connection.
7. being applied to the memory VTT circuit of desk-top mainboard as claimed in claim 1 or 2, which is characterized in that the adjuster
Output end is also connected with output filter circuit, and the output filter circuit includes capacitor C341, capacitor PC69 and capacitor PC70, institute
State capacitor C341, capacitor PC69 and capacitor PC70 be in parallel, it is in parallel after one end be connected to conditioner outlet end and output pin it
Between, the other end ground connection after parallel connection.
8. being applied to the memory VTT circuit of desk-top mainboard as described in claim 1, which is characterized in that the external power supply
Output voltage be 1.5V DC voltage, the conditioner outlet end generates the direct current VTT voltage of 0.75V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920319487.8U CN209343292U (en) | 2019-03-12 | 2019-03-12 | A kind of memory VTT circuit applied to desk-top mainboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920319487.8U CN209343292U (en) | 2019-03-12 | 2019-03-12 | A kind of memory VTT circuit applied to desk-top mainboard |
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| Publication Number | Publication Date |
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| CN209343292U true CN209343292U (en) | 2019-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920319487.8U Active CN209343292U (en) | 2019-03-12 | 2019-03-12 | A kind of memory VTT circuit applied to desk-top mainboard |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768230A (en) * | 2019-12-30 | 2020-02-07 | 深圳微步信息股份有限公司 | Network interface protection circuit and terminal equipment |
-
2019
- 2019-03-12 CN CN201920319487.8U patent/CN209343292U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768230A (en) * | 2019-12-30 | 2020-02-07 | 深圳微步信息股份有限公司 | Network interface protection circuit and terminal equipment |
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