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MM1027

System Reset (with battery back-up)

Mitsumi 

MITSUMI

System Reset (with battery back-up) MM1027, 1081

System Reset (with battery back-up)

Monolithic IC MM1027, 1081

Outline

These ICs were developed for STATIC-RAM (S-RAM) battery back-up, and have built-in switching circuit for

main power supply and battery, back-up timing circuit and battery checker.

Power ON/OFF and momentary power interruptions can damage S-RAM data on equipment that contains an

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S-RAM. These ICs switch the S-RAM to back-up mode (CS signal makes S-RAM CE pin low and CE pin high)

when power supply voltage goes below a set voltage (detection voltage 4.2V typ., variable), preventing

damage to data. Further, when power supply voltage drops, these ICs switch from main power supply to

battery back-up (switching voltage 3.3V typ.). Then, when power supply voltage rises, they first switch the S-

RAM from battery back-up state to main power supply (switching voltage 3.3V typ.), and from back-up mode

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to normal mode (CS signal makes S-RAM CE pin high and CE pin low). These signal processes provide

reliable protection against data damage. The CS signal also can absorb power supply chattering and

roughness through the external capacitor.

There is a built-in battery checker to monitor the back-up battery voltage, and this circuit is turned ON/OFF by

the control pin.

Features

1. Battery back-up

1. Low IC current consumption (loss current)

2. Drop voltage inside IC (input/output voltage difference)

3. Reverse current (reverse leak current)

2. Normal operation

MM1027

Drop voltage inside IC (input/output voltage difference)

Output voltage

VCC=5V

Current consumption D.CONT OPEN

External transistor drive current

MM1081

Drop voltage inside IC (input/output voltage difference)

Output voltage

VCC=5V

Current consumption

External transistor drive current (for output current increase)

TC source current

3. Battery-Vcc switching voltage

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4. Detection voltage (CS, CS) variable

5. Battery checker 1 X type

N type

6. Battery checker 2 X type

N type

IO=10µA

IO=70mA

IO=10mA

IO=120mA

IO=120mA

0.3µA typ.

0.2V typ.

0.1µA max.

0.2V typ.

4.8V typ.

3.0mA max.

25mA typ.

0.25V typ.

4.75V typ.

350µA max.

25mA typ.

3.0µA typ.

3.3V typ.

4.2V typ.

2.70V typ.

2.50V typ.

2.55V typ.

2.35V typ.

Package

TSOP-20A (MM1027XV, MM1027NV, MM1081XV)

SOP-16A (MM1027XF, MM1027NF)

DIP-16A (MM1027XD)

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