TLC7725QDG4

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active High/Active Low
Reset Timeout:	1.1 ms Minimum
Voltage - Threshold:	2.25V
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	TLC7725

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Introduction

TLC7725QDG4 is a high performance Phase-Locked Loop (PLL) supervisor IC from Texas Instruments. It has low quiescent current (< 1.4 μA typ) and low cost. The device supports multiple output options including programmable thresholds, manual reset, watchdog reset and halt. This supervisor IC is designed to assist systems in meeting the level of safety and reliability dictated by stringent standards such as automotive EMC/EMI and industrial safety regulations. This article will focus on the application field and working principle of the TLC7725QDG4.

Application field

The TLC7725QDG4 is suitable for a range of system monitoring and supervision applications, including:

• Automotive-grade microcontrollers
• Safety airbags and LED controllers
• Industrial applications
• Consumer interface devices
• Smart lighting and home appliances
• IoT and surveillance systems

The TLC7725QDG4 can be used in microcontrollers and embedded systems used in automotive, industrial and consumer applications. It is designed to monitor the operating conditions of a system, providing protection against multiple potential errors that can lead to malfunction or damage.The TLC7725QDG4 is compatible with different operating voltages. The device operates with minimal power consumption, making it suitable for battery-powered systems.

Working principle

The TLC7725QDG4 uses a phase-locked loop (PLL) supervisory circuit to detect when a system’s clock signal has stopped or has dropped below a user-set threshold.The PLL includes an oscillator, phase/frequency detector, PLL filter and voltage-controlled oscillator (VCO). The phase/frequency detector compares the phase of the input clock signal with a reference phase from the VCO. The phase error signal is used to update the PLL filter and then sent to the VCO input to adjust the output frequency.When the input clock signal goes through the set threshold (programmable by the user) for longer than the device’s watchdog timer, the PLL begins to generate watchdog reset and halt signals. The user can also program the output thresholds, manual reset and halt signals.

Conclusion

In conclusion, the TLC7725QDG4 is a high performance supervisor IC designed to assist systems in meeting stringent standards, such as automotive EMC/EMI and industrial safety regulations. It is suitable for a range of system monitoring and supervision applications, including automotive-grade microcontrollers, safety airbags and LED controllers, industrial applications, consumer interface devices, smart lighting and home appliances, and IoT and surveillance systems. The device uses a PLL supervisory circuit to detect when a system’s clock signal has stopped or has dropped below a user-set threshold.

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