MITSUMI

System Reset (with battery back-up) PST620, 621

PST621

Pin No.

Pin name

Function

1

Has +2.0V detection voltage to detect AC power supply and

stable power supply primary side, for quick power outage detection.

2

+5V main power supply

3

Back-up power supply (back-up capacitor connected)

4

Pulse width setting pin for pulse shaver

(capacitor and resistor connected)

5

RE

---------------------------------------------------------------

Reset output

6

MODE

Switches 1-chip microcomputer mode with pulse

shaver output signal

7

CE

Chip enable signal output (power outage detection signal)

8

GND

GND

Block Diagram

PST620

PST621

Item

Symbol

Rating

Storage temperature

Operating temperature

Power supply voltage

-0.3~+10V

TC input input voltage

Allowable loss

Pd

450mW