MITSUMI

System Reset (with battery back-up) MM1025, 1174

System Reset (with battery back-up)

Monolithic IC MM1025, 1174

Outline

These ICs were developed for D-RAM and dummy S-RAM battery back-up. D-RAM and dummy S-RAM

power supplies differ from that of S-RAMs because 5V or 3.3V of power supply is required even during

battery back-up. Therefore, these ICs provide voltage from a stable power supply during both normal

operation and back-up. Also, the internal stable power supply switches automatically to battery back-up if the

main power supply voltage goes down for any reason.

Features

1. Battery back-up

MM1025

Current consumption

600µA typ.

0.25V typ.

Output current

40mA max.

MM1174

Current consumption

300µA typ.

0.13V typ.

Output current

40mA max.

2. Normal operation

MM1025

Input/output voltage difference

0.29V typ.

Output current

80mA typ.

15mA typ.

Current consumption

900µA max.

MM1174 (for external transistor)

Input/output voltage difference

0.13V typ.

Output current

Depends on external transistor

10mA typ.

Current consumption

500µA max.

Low

MM1025

4.9V typ.

MM1174

3.25V typ.

Package

SOP-8A

Applications

1. Memory cards (D-RAM cards, other)

2. PCs, word processors and other equipment with D-RAMs

3. Fax machines, photocopiers and other office equipment with D-RAMs