Undervoltage Sensing Circuit

The MC34064 is an undervoltage sensing circuit specifically designed for use as a reset controller in microprocessor?based systems. It offers the designer an economical solution for low voltage detection with a single external resistor. The MC34064 features a trimmed?in?package bandgap reference, and a comparator with precise thresholds and built-in hysteresis to prevent erratic reset

operation. The open collector reset output is capable of sinking in excess of 10 mA, and operation is guaranteed down to 1.0 V input with low standby current. The MC devices are packaged in 3?pin TO-92, micro size TSOP?5, 8?pin SOIC?8 and Micro8surface mount packages. The NCV device is packaged in SOIC?8 and TO?92. Applications include direct monitoring of the 5.0 V MPU/logic power supply used in appliance, automotive, consumer and industrial equipment.

Features

? Trimmed?In?Package Temperature Compensated Reference

? Comparator Threshold of 4.6 V at 25°C

? Precise Comparator Thresholds Guaranteed Over Temperature

? Comparator Hysteresis Prevents Erratic Reset

? Reset Output Capable of Sinking in Excess of 10 mA

? Internal Clamp Diode for Discharging Delay Capacitor

? Guaranteed Reset Operation with 1.0 V Input

? Low Standby Current

? Economical TO?92, TSOP?5, SOIC?8 and Micro8 Surface Mount Packages

? NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes

? Pb?Free Packages are Available