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