DESCRIPTION

The MC33164-3 and MC34164-3 are undervoltage sensing circuits designed specifically for use as reset controllers in microprocessor-based systems. They offer the designer an economical, space efficient solution for low supply voltage detection when used in combination with a single pull-up resistor. Adding one capacitor offers the functionality of a programmable delay time after power returns. The MC33164-3 and MC34164-3 consist of a temperature stable reference comparator with hysteresis, high-current clamping diode and an open collector output stage capable of sinking more than 6mA over the full temperature range. The MC33164-3 and MC34164-3s RESET output is specified to be fully functional at VIN ≥ 1V. See Product Highlight below.

KEY FEATURES

■ Monitors +3.3V Supplies (VT = 2.7V Typ)

■ Outputs Fully Defined At VIN ≥ 1V (See Product Highlight)

■ Ultra-Low Supply Current (13µA Max.)

■ Temperature Compensated ICC For Extremely Stable Current Consumption

■ µP Reset Delay Programmable With 1 External Resistor And Capacitor

■ Comparator Hysteresis Prevents Output Oscillation (60mV Typ.)

■ Electrically Compatible With Motorola MC34164-3

■ Pin-to-Pin Compatible With Motorola MC34064 / MC34164

APPLICATIONS

■ All Microprocessor Or Microcontroller Designs Using 3V/3.3V Supplies

■ Simple 3V/3.3V Undervoltage Detection