MITSMI MM1174, MM1025 Datasheet

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.
Input/output voltage difference I
Output current 40mA max.

MM1174

Current consumption 300µA typ.
Input/output voltage difference I
Output current 40mA max.

2. Normal operation
MM1025

Input/output voltage difference I
Output current V
External transistor drive current V
Current consumption 900µA max.

MM1174 (for external transistor)

Input/output voltage difference I
Output current Depends on external transistor
External transistor drive current (no built-in TR) V
Current consumption 500µA max.

L=40mA 0.25V typ.

L=40mA 0.13V typ.

L=80mA (built-in transistor) 0.29V typ.

CC=6V 80mA typ.
CC= 6V 15mA typ.

L=200mA 0.13V typ.

CC=3.6V 10mA typ.

3. Switching voltage from V
MM1025 4.9V typ.
MM1174 3.25V typ.

4. V

CC-Battery forced switching and detection voltage adjustment possible

CC to Battery VCC=High Low

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

MITSUMI

1432

8567

SOP-8P (A)

Pin Assignment

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

1
2 GND
3 GND
4 CS

Pin Description

Pin No. Pin name Function

1 Forced switching and detection voltage adjustment
2 GND
3 GND
4 CS
5 V
6 VOUT
7 VCC
8 TRB External transistor drive

Block Diagram

BATT

5 V

BATT

6 VOUT
7 VCC
8 TRB

Absolute Maximum Ratings

Item Symbol Rating Units

Operating temperature T

Storage temperature T
Maximum output current 1 I
Maximum output current 2 I

Power supply voltage V

Power consumption Pd 300 mW

(Ta=25°C)

OPR

STG 40~+125
L max. 80 mA
L max. 40 mA

CC

-

20~+70

-

0.3~+18 V

°

C

°

C