TLC7701QD

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:	1.1V
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:	TLC7701

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Introduction

The TLC7701QD is a widely used programmable voltage supervisor (PVS) designed for computer and embedded system applications. This versatile device features two selectable power supply tracking and monitoring channels and advanced features such as programmable voltage detector and window voltage detector. In addition, the device can be used to protect analog and digital design applications against overvoltages on core supplies and system I/O rails. The TLC7701QD belongs to a subcategory of power management ICs (PMICs) known as supervisors. In this article, we will discuss the application fields and working principle of the TLC7701QD.

Applications

The TLC7701QD is a highly versatile, low-cost power supply voltage supervisor suitable for monitoring of multiple power supply voltages or as a power-on reset circuit for embedded systems. The two independent channels in the TLC7701QD permits dual-voltage tracking and monitoring. This makes the TLC7701QD a suitable IC for multiple applications ranging from single-supply systems, multiple-supply systems, system reset, and power-on reset. The two channels of the TLC7701QD also feature ramp-up circuit, which is specially designed to be used as power-on reset circuit to control the transition of the power-on sequence. This feature is extremely useful in managing power-on reset signals and powering up complex embedded systems without overshooting. The TLC7701QD is also suitable for a variety of system reset applications. The device can be used to monitor system supply voltage or core voltage and ensures proper transition between normal operation state and reset state of the system. In addition, due to its dual-channel capabilities, the TLC7701QD can monitor multiple supply voltage rails in a computer system, ensuring proper system reset when the voltages drop too low. The TLC7701QD is also used in analog designs such as audio amplifiers and comparators. The device provides additional control and protection against overvoltage by monitoring the supply voltage. This prevents damage to the analog circuity due to unwanted supply voltage variations. Overall, the TLC7701QD is a versatile device with wide application fields in embedded and computer systems, system reset, analog circuitry, and various other applications.

Working Principle

The TLC7701QD consists of two voltage supervisors that independently monitor two adjustable threshold voltages. The Block diagram of the device consists of comparators and logic circuitry built into the TLC7701QD.The two input signals VINA and VINB are the two monitored voltage values. Each of the two inputs is fed to the set threshold comparators A and B respectively. The comparators have adjustable thresholds which make them suitable for monitoring different supplies voltages. The threshold voltage is set by the voltage value VM_SET, which is an externally generated voltage between 2.5V and 5.25V through an external resistor divider. When VINA or VINB are below VM_SET, the comparator transitions to a LOW output. When the voltage exceeds the threshold voltage, the comparator output transitions to HIGH. The LOW and HIGH outputs from the comparators are then fed to logic circuitry which is used to generate RESET and RDY signals. The RESET signal is used to reset the system when the input voltage values are outside the set thresholds. The RDY signal is generated when both channels indicate that the input voltage values are above their respective thresholds.

Conclusion

The TLC7701QD is a widely used programmable voltage supervisor designed for computer and embedded system applications. This versatile device features two selectable power supply tracking and monitoring channels and provides additional control and protection against overvoltage. The TLC7701QD is suitable for multiple applications ranging from single-supply systems, multiple-supply systems, system reset, and power-on reset. The working principle of the TLC7701QD consists of two adjustable threshold comparators, logic circuitry, and RESET and RDY signals. In conclusion, the TLC7701QD has wide application fields and is an important member in the PMIC - Supervisors family.

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