MC34064DM

欠压检测电路 UNDERVOLTAGE SENSING CIRCUIT

DESCRIPTION

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.

KEY FEATURES

■ 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.

APPLICATIONS  

■ All Microprocessor Or Microcontroller Designs Using 5V Supplies

■ Simple 5V Undervoltage Detection