The MC34064 is an undervoltage sensing circuit designed specifically for use as a reset controller in microproces sor-based systems. It offers 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 34064 consists of a temperature stable reference comparator with hysteresis, high-current clamping diode and open collector output stage capable of sinking up to 60mA. The MC34064's RESET output is specified to be fully functional at VIN=1V. A major improve ment over competing products is the glitch-free supply current during undervoltage detection. Competing products demand a step function increase in operating current during the time that you least want or need it.... during power loss. See Product Highlight below.
■ Monitors 5V Supplies (VT = 4.6V Typ.)
■ Outputs Fully Defined At VIN = 1V (See Figure 1)
■ Glitch-Free Supply Current During Switching (See Product Highlight)
□ Ultra-Low Supply Current (500µA Max.)
□ Temperature Compensated ICC For Extremely Stable Current Consumption
□ µP Reset Function Programmable With 1 External Resistor And Capacitor
□ Comparator Hysteresis Prevents Output Oscillation
□ Electrically Compatible With Motorola MC34064
□ Pin-to-Pin Compatible With Motorola MC34064/MC34164.
■ All Microprocessor Or Microcontroller Designs Using 5V Supplies
■ Simple 5V Undervoltage Detection