TL7770-5CDWR High-Accuracy (±2%) 5V Voltage Monitor with Manual Reset Low Supply Current (40µA) Power-On Reset and 200ms Delay in SOIC-8 Package

TL7770-5CDWR High-Accuracy (±2%) 5V Voltage Monitor with Manual Reset Low Supply Current (40µA) Power-On Reset and 200ms Delay in SOIC-8 Package

Features

Power-On Reset Generator

Automatic Reset Generation After Voltage Drop

RESET Defined When VCC Exceeds 1 V

Wide Supply-Voltage Range . . . 3.5 V to 18 V

Precision Overvoltage and Undervoltage Sensing

250-mA Peak Output Current for Driving SCR Gates

2-mA Active-Low SCR Gate Drive for False-Trigger Protection

Temperature-Compensated Voltage Reference

True and Complementary Reset Outputs

Externally Adjustable Output Pulse Duration

Applications

Industrial Control and Automation Systems

Automotive Electronics

Computer and Server Systems

Consumer Electronics and Smart Appliances

Security and Critical Systems

Description

The TL7770 is an integrated-circuit system supervisor designed for use as a reset controller in microcomputer and microprocessor power-supply systems. This device contains two independent supply-voltage supervisors that monitor the supplies for overvoltage and undervoltage conditions at the VSO and VSU terminals, respectively. When VCC attains the minimum voltage of 1 V during power up, the RESET output becomes active (low). As VCC approaches 3.5 V, the time-delay function activates, latching RESET and RESET active (high and low, respectively) for a time delay (td) after system voltages have achieved normal levels. Above VCC = 3.5 V, taking RESIN low activates the time-delay function during normal system-voltage levels. To ensure that the microcomputer system has reset, the outputs remain active until the voltage at VSU exceeds the threshold value, VIT+, for a time delay, which is determined by an external timing capacitor such that: td 20 103 capacitance

where td is in seconds and capacitance is in farads.

The overvoltage-detection circuit is programmable for a wide range of designs. During an overvoltage condition, an internal silicon-controlled rectifier (SCR) is triggered, providing 250-mA peak instantaneous current and 25-mA continuous current to the SCR gate drive terminal, which can drive an external high-current SCR gate or an overvoltage-warning circuit.

The TL7770C series is characterized for operation from 0°C to 70°C. The TL7770I series is characterized for operation from ±40°C to 85°C.

INFORMATION

Drawing

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