A fuse programmable control circuit with isolation function

Abstract

A fuse programmable control circuit with an isolation function is provided with a power isolation control circuit unit, a fuse circuit unit and a ground isolation control circuit unit; the power isolation control circuit unit and the ground isolation control circuit unit are respectively connected to the fuse circuit unit. When in use, the fuse programmable control circuit with an isolation function isolates the programming power in the power isolation control circuit unit by the power isolation control circuit unit and isolates the programming ground in the power isolation control circuit unit by the ground isolation control circuit unit, thereby preventing the chip from being abnormally fused due to power burr interference during power-on or use, and improving the reliability of fuse programming.

Description

Technical Field

[0001] The invention relates to the technical field of programmable control circuits of fuses in integrated circuit design, and in particular to a programmable control circuit of fuses with an isolation function. Background Art

[0002] The fuse programming circuit is to apply a large voltage to both ends of the fuse, and when the current flows, electron migration occurs, causing its resistance to increase or Joule heat to cause it to break. When the fuse is used for data storage, it is achieved by maintaining or changing the resistance value of the fuse. The data is read out based on converting the resistance value of the fuse into a voltage value, and comparing it with the built-in reference voltage to determine whether the fuse is blown or not. In the prior art, when the chip is powered on during circuit operation, the fuse circuit is mistakenly burned; at the same time, the programming voltage changes rapidly, the fuse circuit is mistakenly burned; and ESD static electricity damages the fuse circuit.

[0003] Therefore, in view of the shortcomings of the prior art, it is necessary to provide a fuse programmable control circuit with an isolation function to overcome the shortcomings of the prior art. Summary of the invention

[0004] One of the purposes of the present invention is to avoid the shortcomings of the prior art and provide a fuse programmable control circuit with an isolation function. The fuse programmable control circuit with an isolation function can increase the isolation of the programming power supply and the isolation of the programming ground line to avoid the chip being abnormally blown due to power glitch interference during the power-on process or during use, thereby improving the reliability of fuse programming.

[0005] The above-mentioned object of the present invention is achieved by the following technical means: A fuse programmable control circuit with isolation function is provided, which is provided with a power isolation control circuit unit, a fuse circuit unit and a ground isolation control circuit unit; the power isolation control circuit unit and the ground isolation control circuit unit are respectively connected to the fuse circuit unit.

[0006] Preferably, the power isolation control circuit unit is provided with a PS control signal, an inverter INV1, a chip U1, a pull-down resistor R1, a pull-up tube PMOS1, a power control tube PMOS2, a discharge tube NOMS1 and a discharge tube NMOS2; the output end of the PS control signal is connected to the input end of the inverter INV1, the ground line of the inverter INV1 is grounded GND, the power supply end of the inverter INV1 is connected to the ground isolation control circuit unit, and the power supply end of the inverter INV1 is connected to the power supply VDD, the output end of the inverter INV1 is respectively connected to the 1st pin of the chip U1 and the gate of the discharge tube NMOS2, the 2nd pin of the chip U1 is respectively connected to the source of the pull-up tube PMOS1, the source of the power control tube PMOS2, the ground isolation control circuit unit and the fuse circuit unit, and the 2nd pin of the chip U1 is connected to the power supply VDDQ;

[0007] Among them, the 3rd pin of the above-mentioned chip U1 is respectively connected to the drain of the pull-up tube PMOS1, the gate of the power control tube PMOS2, and the gate of the discharge tube NMOS1, the 4th pin of the chip U1 is grounded GND, the source of the pull-up tube PMOS1 is connected to one end of the pull-down resistor R1, the other end of the pull-down resistor R1 is grounded GND, the source of the discharge tube NMOS2 is grounded GND, the drain of the discharge tube NMOS2 is respectively connected to the drain of the discharge tube NOMS1, the drain of the power control tube PMOS2 and the fuse circuit unit, and the drain of the discharge tube NMOS2 is connected to the power supply VQR.

[0008] Preferably, the fuse circuit unit is provided with a BL bit line, a WL word line, a power control tube PMOS5, a power control tube PMOS6, a discharge tube NMOS6, a discharge tube NMOS7, a resistor R3 and a fuse; the source of the power control tube PMOS5 is respectively connected to the drain of the power control tube PMOS5, the 2nd pin of the chip U1 and the ground isolation control circuit unit, the gate of the power control tube PMOS5 is respectively connected to one end of the resistor R3 and the gate of the discharge tube NMOS7, and the power control tube PMOS5 is connected to the power supply VDDQ,

[0009] Among them, the other end of the above-mentioned resistor R3 is connected to the source of the discharge tube NMOS7, and the other end of the resistor R3 is connected to the ground line GND; the drain of the discharge tube NMOS7 is respectively connected to the gate of the discharge tube NMOS6 and the WL word line, the source of the discharge tube NMOS6 is connected to the ground line GND1, the drain of the discharge tube NMOS6 is connected to one end of the fuse fuse, and the other end of the fuse fuse is connected to the drain of the power control tube PMOS6, the gate of the power control tube PMOS6 is connected to the BL bit line, the source of the power control tube PMOS6 is connected to the drain of the discharge tube NMOS2, and the source of the power control tube PMOS6 is connected to the power supply VQR.

[0010] Preferably, the ground isolation control circuit unit is provided with a power control tube PMOS3, a power control tube PMOS4, a discharge tube NMOS3, a discharge tube NMOS4, a discharge tube NMOS5 and a resistor R2; the source of the power control tube PMOS4 is respectively connected to the drain of the power control tube PMOS4 and the 2nd pin of the chip U1, and the source of the power control tube PMOS4 is connected to the power supply VDDQ,

[0011] Among them, the gate of the above-mentioned power control tube PMOS4 is respectively connected to one end of the resistor R2 and the gate of the discharge tube NMOS5, the other end of the resistor R2 is respectively connected to the source of the discharge tube NMOS5 and the source of the power control tube NMOS4, the other end of the resistor R2 is connected to the ground line GND, the source of the power control tube NMOS3 is connected to the ground line GND, the gate of the power control tube NMOS3 is respectively connected to the drain of the power control tube NMOS3 and the source of the power control tube PMOS3, the source of the power control tube PMOS3 is connected to the power supply VDD, the source of the power control tube PMOS3 is connected to the power supply end of the inverter INV1, the drain of the power control tube PMOS3 is respectively connected to the drain of the discharge tube NMOS5 and the gate of the discharge tube NMOS4, and the drain of the discharge tube NMOS4 is connected to the ground line GND1.

[0012] Among them, the pin 3 of the chip U1 is set as the output terminal Q.

[0013] Among them, pin 1 of the chip U1 is set as an input terminal D.

[0014] The chip U1 is configured as a Level Shift converter.

[0015] The fuse programmable control circuit with isolation function of the present invention is provided with a power isolation control circuit unit, a fuse circuit unit and a ground isolation control circuit unit; the power isolation control circuit unit and the ground isolation control circuit unit are respectively connected to the fuse circuit unit. When in use, the fuse programmable control circuit with isolation function isolates the programming power in the power isolation control circuit unit by the power isolation control circuit unit and isolates the programming ground in the power isolation control circuit unit by the ground isolation control circuit unit, thereby preventing the chip from being abnormally fused due to power burr interference during power-on or use, and improving the reliability of fuse programming. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0017] Figure 1 The present invention is a schematic diagram of the module connection structure of Example 1 of a fuse programmable control circuit with an isolation function.

[0018] Figure 2 The present invention is a circuit diagram of a power isolation control circuit unit of Embodiment 1 of a fuse programmable control circuit with an isolation function.

[0019] Figure 3 The circuit diagram is a ground isolation control circuit unit of Embodiment 1 of a fuse programmable control circuit with an isolation function according to the present invention.

[0020] Figure 4 It is a circuit diagram of a fuse circuit unit of Embodiment 1 of a programmable fuse control circuit with an isolation function according to the present invention.

[0021] Description of reference numerals:

[0022] A power isolation control circuit unit 100 , a fuse circuit unit 200 , and a ground isolation control circuit unit 300 . DETAILED DESCRIPTION

[0023] The present invention is further described in conjunction with the following examples.

[0024] Example 1

[0025] A programmable fuse control circuit with isolation function, such as Figure 1 As shown, a power isolation control circuit unit 100, a fuse circuit unit 200 and a ground isolation control circuit unit 300 are provided; the power isolation control circuit unit 100 and the ground isolation control circuit unit 300 are respectively connected to the fuse circuit unit 200. When in use, the power isolation control circuit unit 100 realizes the isolation of the fuse programming power supply of the fuse circuit unit 200, and the ground isolation control circuit unit 300 realizes the isolation of the programming ground.

[0026] Specifically, Figure 2 As shown, the power isolation control circuit unit 100 is provided with a PS control signal, an inverter INV1, a chip U1, a pull-down resistor R1, a pull-up tube PMOS1, a power control tube PMOS2, a discharge tube NOMS1 and a discharge tube NMOS2; the output end of the PS control signal is connected to the input end of the inverter INV1, the ground line of the inverter INV1 is grounded GND, the power supply end of the inverter INV1 is connected to the ground isolation control circuit unit 300, and the power supply end of the inverter INV1 is connected to the power supply VDD, the output end of the inverter INV1 is respectively connected to the 1st pin of the chip U1 and the gate of the discharge tube NMOS2, the 2nd pin of the chip U1 is respectively connected to the source of the pull-up tube PMOS1, the source of the power control tube PMOS2, the ground isolation control circuit unit 300 and the fuse circuit unit 200, and the 2nd pin of the chip U1 is connected to the power supply VDDQ;

[0027] Among them, the 3rd pin of the chip U1 is respectively connected to the drain of the pull-up tube PMOS1, the gate of the power control tube PMOS2, and the gate of the discharge tube NMOS1, the 4th pin of the chip U1 is grounded GND, the source of the pull-up tube PMOS1 is connected to one end of the pull-down resistor R1, the other end of the pull-down resistor R1 is grounded GND, the source of the discharge tube NMOS2 is grounded GND, the drain of the discharge tube NMOS2 is respectively connected to the drain of the discharge tube NOMS1, the drain of the power control tube PMOS2 and the fuse circuit unit 200, and the drain of the discharge tube NMOS2 is connected to the power supply VQR. Among them, the chip U1 is set as a Level Shift level converter, the 3rd pin of the chip U1 is set as the output terminal Q, and the 1st pin of the chip U1 is set as the input terminal D.

[0028] When in use, the power control tube PMOS2 separates VDDQ and the fuse programming power supply VQR. During the VDD power-on process, the PS control signal is used to control the switch state of the PMOS2 tube to ensure that VDDQ is blocked from entering the fuse during the VDD power-on process.

[0029] In the power isolation control circuit unit 100, when VDD is powered on and VDDQ is in the power-on process, PS is set to a low level, and after being output by the inverter INV1, it is a high level, and after passing through the level conversion module, the power control tube PMOS2 is turned off to prevent the VDDQ programming voltage from entering the internal fuse. On the contrary, when PS is set to a high level, the power control tube PMOS2 is turned on, and the VDDQ programming voltage enters the fuse. If VDD has not been powered on or is not stable, PS does not work, and VDDQ has been powered on, then the pull-up tube PMOS1 and the resistor R1 control PMOS2 to be in the off state, so that VDDQ enters the fuse, that is, VQR is in a floating state. The discharge tube NMOS1 discharges VQR when VDDQ exists, and the discharge tube NMOS2 discharges VQR when VDDQ is in a suspended state.

[0030] Specifically, Figure 4 As shown, the fuse circuit unit 200 is provided with a BL bit line, a WL word line, a power control tube PMOS5, a power control tube PMOS6, a discharge tube NMOS6, a discharge tube NMOS7, a resistor R3 and a fuse fuse; the source of the power control tube PMOS5 is respectively connected to the drain of the power control tube PMOS5, the 2nd pin of the chip U1 and the ground isolation control circuit unit 300, the gate of the power control tube PMOS5 is respectively connected to one end of the resistor R3 and the gate of the discharge tube NMOS7, and the power control tube PMOS5 is connected to the power supply VDDQ,

[0031] Among them, the other end of the above-mentioned resistor R3 is connected to the source of the discharge tube NMOS7, and the other end of the resistor R3 is connected to the ground line GND; the drain of the discharge tube NMOS7 is respectively connected to the gate of the discharge tube NMOS6 and the WL word line, the source of the discharge tube NMOS6 is connected to the ground line GND1, the drain of the discharge tube NMOS6 is connected to one end of the fuse fuse, and the other end of the fuse fuse is connected to the drain of the power control tube PMOS6, the gate of the power control tube PMOS6 is connected to the BL bit line, the source of the power control tube PMOS6 is connected to the drain of the discharge tube NMOS2, and the source of the power control tube PMOS6 is connected to the power supply VQR. The connection method of the power control tube is equivalent to a MOS capacitor. When the programming voltage experiences voltage fluctuations, glitch interference, or ESD, the gate voltage of the discharge tube NMOS7 at one end of the capacitor also rises rapidly, the discharge tube NMOS7 is turned on, and the gate voltage of the discharge tube NMOS6 is pulled down, turning off the discharge tube NMOS6 and blocking the current path from the fuse to the ground.

[0032] Specifically, Figure 3 As shown, the ground isolation control circuit unit 300 is provided with a power control tube PMOS3, a power control tube PMOS4, a discharge tube NMOS3, a discharge tube NMOS4, a discharge tube NMOS5 and a resistor R2; the source of the power control tube PMOS4 is respectively connected to the drain of the power control tube PMOS4 and the 2nd pin of the chip U1, and the source of the power control tube PMOS4 is connected to the power supply VDDQ,

[0033] Among them, the gate of the power control tube PMOS4 is respectively connected to one end of the resistor R2 and the gate of the discharge tube NMOS5, the other end of the resistor R2 is respectively connected to the source of the discharge tube NMOS5 and the source of the power control tube NMOS4, the other end of the resistor R2 is connected to the ground line GND, the source of the power control tube NMOS3 is connected to the ground line GND, the gate of the power control tube NMOS3 is respectively connected to the drain of the power control tube NMOS3 and the source of the power control tube PMOS3, the source of the power control tube PMOS3 is connected to the power supply VDD, the source of the power control tube PMOS3 is connected to the power supply end of the inverter INV1, the drain of the power control tube PMOS3 is respectively connected to the drain of the discharge tube NMOS5 and the gate of the discharge tube NMOS4, and the drain of the discharge tube NMOS4 is connected to the ground line GND1. The discharge tube NMOS4 separates the external ground GND and the fuse ground GND1, and when the programming voltage VDDQ changes rapidly, the fuse ground GND1 is disconnected by controlling the discharge tube NMOS4. The connection method of the power control tube PMOS4 is equivalent to a MOS capacitor. When VDDQ changes rapidly, the gate voltage (point B) of the discharge tube NMOS5 at one end of the MOS capacitor also rises rapidly, the discharge tube NMOS5 is turned on, the voltage at point C is pulled down, and the power control tube PMOS4 is turned off, thereby isolating the fuse ground GND1 from the external ground GND.

[0034] In this technology Figure 3 In the circuit, the connection of the power control tube PMOS4 is equivalent to a MOS capacitor. When the VDDQ programming voltage changes rapidly, the gate voltage (point B) of the discharge tube NMOS5 at one end of the power control tube PMOS4, which is equivalent to the capacitor, also rises rapidly. The discharge tube NMOS5 is turned on, the voltage at point C is pulled down, and the discharge tube NMOS4 is turned off, so as to isolate the fuse ground GND1 from the external ground GND, and prevent a large current from flowing through the fuse, causing the fuse to burn incorrectly. When VDDQ is stable, the power control tube PMOS4 as a capacitor blocks the connection between VDDQ and point B, the pull-down resistor R2 pulls the voltage at point B down to the ground, the discharge tube NMOS5 is turned off, the path from point C to the ground is disconnected, and the discharge tube NMOS3 using a diode connection pulls the gate voltage of the power control tube PMOS3 down to the ground. The pipeline of the power control tube PMOS3 is turned on, the voltage at point C is raised to turn on the discharge tube NMOS4, and the ground wires GND1 and GND are turned on, so that when the fuse is programmed and read, the path from the power supply through the fuse to GND is normal.

[0035] exist Figure 4The connection method of the power control tube PMOS5 is equivalent to that of a MOS capacitor. When the programming voltage VDDQ experiences voltage fluctuations, glitch interference, or ESD, the gate voltage (point D) of the discharge tube NMOS7 at one end of the power control tube PMOS5, which is equivalent to the capacitor, also rises rapidly, and the discharge tube NMOS7 is turned on. The gate voltage of the discharge tube NMOS6 is pulled down, and the discharge tube NMOS6 is turned off, blocking the current path from the fuse to the ground. When VDDQ is in a stable state, the resistor R3 pulls down the voltage at point D to turn off the NMOS7 tube. The WL word line is high level valid. When the WL word line is set high, the discharge tube NMOS6 is in the open state. The BL bit line is low level valid. When the BL bit line is set low, the power control tube PMOS6 is turned on, and the internal programming voltage VQR flows through the Fuse fuse to program or read the fuse.

[0036] The programmable fuse control circuit with isolation function of the present embodiment is provided with a power isolation control circuit unit, a fuse circuit unit and a ground isolation control circuit unit; wherein the power isolation control circuit unit and the ground isolation control circuit unit are respectively connected to the fuse circuit unit; the programmable fuse control circuit with isolation function controls the switch state of the power control tube PMOS2 by adding a PS control signal, ensuring that during the VDD power-on process, VDDQ is blocked from entering the fuse fuse, and the fuse is mistakenly burned during the chip power-on process. At the same time, when VDDQ changes rapidly, the fuse ground line is disconnected by controlling the discharge tube NMOS4 to prevent the programming power supply VDDQ from changing too fast and causing the fuse to be mistakenly burned, and by adding a protection circuit on the WL word line, when the programming voltage has voltage fluctuations, burr interference or ESD and other working conditions, the fuse current loop is turned off to protect the fuse from being mistakenly burned. And in the subsequent function expansion, it can also be easily mastered by designers and applied in other integrated circuit designs.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A programmable fuse control circuit with isolation function, characterized in that: A power isolation control circuit unit, a fuse circuit unit and a ground isolation control circuit unit are provided; the power isolation control circuit unit and the ground isolation control circuit unit are connected to the fuse circuit unit respectively, and the power isolation control circuit unit is connected to the ground isolation control circuit unit; The power isolation control circuit unit is provided with a PS control signal, an inverter INV1, a chip U1, a pull-down resistor R1, a pull-up tube PMOS1, a power control tube PMOS2, a discharge tube NOMS1 and a discharge tube NMOS2; the output end of the PS control signal is connected to the input end of the inverter INV1, the ground line of the inverter INV1 is grounded GND, the power supply end of the inverter INV1 is connected to the ground isolation control circuit unit, and the power supply end of the inverter INV1 is connected to the power supply VDD, the output end of the inverter INV1 is respectively connected to the 1st pin of the chip U1 and the gate of the discharge tube NMOS2, the 2nd pin of the chip U1 is respectively connected to the source of the pull-up tube PMOS1, the source of the power control tube PMOS2, the ground isolation control circuit unit and the fuse circuit unit, and the 2nd pin of the chip U1 is connected to the power supply VDDQ; Pin 3 of the chip U1 is respectively connected to the drain of the pull-up tube PMOS1, the gate of the power control tube PMOS2, and the gate of the discharge tube NMOS1, pin 4 of the chip U1 is grounded GND, the source of the pull-up tube PMOS1 is connected to one end of the pull-down resistor R1, the other end of the pull-down resistor R1 is grounded GND, the source of the discharge tube NMOS2 is grounded GND, the drain of the discharge tube NMOS2 is respectively connected to the drain of the discharge tube NOMS1, the drain of the power control tube PMOS2 and the fuse circuit unit, and the drain of the discharge tube NMOS2 is connected to the power supply VQR.

2. The programmable fuse control circuit with isolation function according to claim 1, characterized in that: The fuse circuit unit is provided with a BL bit line, a WL word line, a power control tube PMOS5, a power control tube PMOS6, a discharge tube NMOS6, a discharge tube NMOS7, a resistor R3 and a fuse; the source of the power control tube PMOS5 is respectively connected to the drain of the power control tube PMOS5, the 2nd pin of the chip U1 and the ground isolation control circuit unit, the gate of the power control tube PMOS5 is respectively connected to one end of the resistor R3 and the gate of the discharge tube NMOS7, and the power control tube PMOS5 is connected to the power supply VDDQ, The other end of the resistor R3 is connected to the source of the discharge tube NMOS7, and the other end of the resistor R3 is connected to the ground line GND; The drain of the discharge tube NMOS7 is connected to the gate of the discharge tube NMOS6 and the WL word line respectively, the source of the discharge tube NMOS6 is connected to the ground line GND1, the drain of the discharge tube NMOS6 is connected to one end of the fuse fuse, the other end of the fuse fuse is connected to the drain of the power control tube PMOS6, the gate of the power control tube PMOS6 is connected to the BL bit line, the source of the power control tube PMOS6 is connected to the drain of the discharge tube NMOS2, and the source of the power control tube PMOS6 is connected to the power supply VQR.

3. The programmable fuse control circuit with isolation function according to claim 2, characterized in that: The ground isolation control circuit unit is provided with a power control tube PMOS3, a power control tube PMOS4, a discharge tube NMOS3, a discharge tube NMOS4, a discharge tube NMOS5 and a resistor R2; the source of the power control tube PMOS4 is respectively connected to the drain of the power control tube PMOS4 and the 2nd pin of the chip U1, and the source of the power control tube PMOS4 is connected to the power supply VDDQ, The gate of the power control tube PMOS4 is respectively connected to one end of the resistor R2 and the gate of the discharge tube NMOS5, the other end of the resistor R2 is respectively connected to the source of the discharge tube NMOS5 and the source of the power control tube NMOS4, the other end of the resistor R2 is connected to the ground line GND, the source of the power control tube NMOS3 is connected to the ground line GND, the gate of the power control tube NMOS3 is respectively connected to the drain of the power control tube NMOS3 and the source of the power control tube PMOS3, the source of the power control tube PMOS3 is connected to the power supply VDD, the source of the power control tube PMOS3 is connected to the power supply end of the inverter INV1, the drain of the power control tube PMOS3 is respectively connected to the drain of the discharge tube NMOS5 and the gate of the discharge tube NMOS4, and the drain of the discharge tube NMOS4 is connected to the ground line GND1.

4. The programmable fuse control circuit with isolation function according to claim 3, characterized in that: Pin 3 of the chip U1 is configured as an output terminal Q.

5. The programmable fuse control circuit with isolation function according to claim 4, characterized in that: Pin 1 of the chip U1 is configured as an input terminal D.

6. The programmable fuse control circuit with isolation function according to claim 5, characterized in that: The chip U1 is configured as a Level Shift converter.

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