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 (andplusmn;2%) 5V Voltage Monitor with Manual Reset Low Supply Current (40andmicro;A) Power-On Reset and 200ms Delay in SOIC-8 Package

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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

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Applications

Industrial Control and Automation Systems

Automotive Electronics

Computer and Server Systems

Consumer Electronics and Smart Appliances

Security and Critical Systems

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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 0anddeg;C to 70anddeg;C. The TL7770I series is characterized for operation from andplusmn;40anddeg;C to 85anddeg;C.

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INFORMATION

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Drawing

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