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
Input/output voltage difference I
L
=40mA
Output current
MM1174
Current consumption
Input/output voltage difference I
L
=40mA
Output current
2. Normal operation
MM1025
Input/output voltage difference I
L
=80mA (built-in transistor)
Output current
V
CC
=6V
External transistor drive current V
CC
= 6V
Current consumption
MM1174 (for external transistor)
Input/output voltage difference I
L
=200mA
Output current
External transistor drive current (no built-in TR) V
CC
=3.6V
Current consumption
600µA typ.
0.25V typ.
40mA max.
300µA typ.
0.13V typ.
40mA max.
0.29V typ.
80mA typ.
15mA typ.
900µA max.
0.13V typ.
Depends on external transistor
10mA typ.
500µA max.
3. Switching voltage from V
CC
to Battery V
CC
=High Low
MM1025
4.9V typ.
MM1174
3.25V typ.
4. V
CC
-Battery forced switching and detection voltage adjustment possible
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 [ MITSUMI ELECTRONICS, CORP. ]
