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參數(shù)資料
| 型號： | MM1081XV |
| 廠商： | MITSUMI ELECTRIC CO LTD |
| 元件分類： | 電源管理 |
| 英文描述： | System Reset (with battery back-up) Monolithic IC |
| 中文描述： | POWER SUPPLY SUPPORT CKT, PDSO29 |
| 封裝： | TSOP-20 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大?。?/td> | 120K |
| 代理商： | MM1081XV |
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
S-RAM. These ICs switch the S-RAM to back-up mode (CS signal makes S-RAM CE pin low and CE
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
to normal mode (CS signal makes S-RAM CE pin high and CE
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.
pin high)
pin low). These signal processes provide
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
V
CC
=5V
Current consumption
D.CONT OPEN
External transistor drive current
MM1081
Drop voltage inside IC (input/output voltage difference)
Output voltage
V
CC
=5V
Current consumption
External transistor drive current (for output current increase)
TC source current
3. Battery-Vcc switching voltage
4. Detection voltage (CS, CS
5. Battery checker 1
X type
N type
6. Battery checker 2
X type
N type
0.3μA typ.
0.2V typ.
0.1μA max.
I
O
=10μA
I
O
=70mA
I
O
=10mA
0.2V typ.
4.8V typ.
3.0mA max.
25mA typ.
I
O
=120mA
I
O
=120mA
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.
) variable
Package
TSOP-20A (MM1027XV, MM1027NV, MM1081XV)
SOP-16A (MM1027XF, MM1027NF)
DIP-16A (MM1027XD)
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