PT7M7434TAEX

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The PT7M7434TAEX is a low-voltage Supervisory Circuit constructed with a CMOS process to watch over a main power supply voltage and provide three reset signals and one watchdog timer reset signal. Low power requirements, a push-pull output, and selectable reset and reset timing functions make the PT7M7434TAEX an efficient, versatile supervisor circuit, suitable for many different applications.

Operating Principle

The PT7M7434TAEX supervisor circuit monitors a main power supply voltage, VCC, typically 3.3V. The circuit uses a threshold voltage of 1.9V and a hysteresis voltage 1.5V between the rising and falling thresholds of the reset signal. When VCC drops below the reset threshold, a reset signal is generated within 150ms (typical) after power is initially turned on. As VCC rises above the reset threshold, the reset signal is removed. If VCC drops below the reset threshold (Vres) for longer than the reset timer is programmed, the reset output is immediately asserted regardless of the voltage level of VCC.

The PT7M7434TAEX can be configured as an active high or active low reset signal depending on the state of input pins RST and MR. The output signal can also be put in a forced active or forced idle state by the pins RST and MR.

Application Fields

The PT7M7434TAEX is well suited to many types of applications, including:

• Computer motherboards
• Networking equipment
• Printers
• Medical equipment
• GPS receivers
• Automotive systems
• Industrial control systems

The small size, low power consumption, selectable output, and low reset threshold make the PT7M7434TAEX suitable for use in a wide range of applications, particularly those requiring robust power supply monitoring.

Conclusion

The PT7M7434TAEX low voltage Supervisory Circuit is a versatile and reliable way to monitor power supply voltages and provide active low or active high reset signals for a wide range of applications. The small size, low power consumption, and selectable reset functions of the PT7M7434TAEX make it ideal for many applications which require robust power management.

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