PST620DDB データシートの表示（PDF） - Mitsumi

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PST620DDB

System Reset (with battery back-up) Monolithic IC

Mitsumi 

MITSUMI

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

System Reset (with battery back-up)

Monolithic IC PST620, 621

Outline

These ICs are part of the regular series of back-up ICs, and use capacitors (super capacitor, large capacity

chemical capacitor) as back-up power supply. They control 1-chip microcomputer high-speed, low-speed,

and stand-by modes (MNI control).

These ICs also are capable of controlling data save in EPROM and other nonvolatile memories during power outage.

Features

1. Low current consumption

2. Capacitors (super capacitor, large capacity chemical capacitor) are used for back-up power supply, lowering

system cost

3. Stable 1-chip microcomputer crystal oscillator rise time maintained with the built-in pulse shaver.

4. In addition to power outage detection for main power supply (+5V), there are built-in pins to detect AC power

supply and +5V power supply primary side

5. Reset signal output by back-up power supply (super capacitor, large capacity chemical capacitor) detection

Package

DIP-8B (PST620DDB, PST621DDB)

SOP-8C (PST620DFT, PST621DFT)

Applications

1. VCR

2. Audio equipment

3. Communications equipment

4. Rice cookers, etc.

Pin Assignment

8765

Pin Description

PST620

Pin No.

1

2

3

4

5

6

7

8

Pin name

VAC

VCC1

VCC2

TC

RE

PSCONT

CE

GND

1234

Function

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

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

+5V main power supply

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

Pulse width setting pin for pulse shaver

(capacitor and resistor connected)

Reset output

Pulse shaver ON/OFF switching High : OFF Low : ON

Chip enable signal output

GND

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