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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 IL=40mA Output current MM1174 Current consumption Input/output voltage difference IL=40mA Output current 2. Normal operation MM1025 Input/output voltage difference IL=80mA (built-in transistor) Output current VCC=6V External transistor drive current VCC= 6V Current consumption MM1174 (for external transistor) Input/output voltage difference IL=200mA Output current External transistor drive current (no built-in TR) VCC=3.6V Current consumption
600A typ. 0.25V typ. 40mA max. 300A typ. 0.13V typ. 40mA max.
0.29V typ. 80mA typ. 15mA typ. 900A max. 0.13V typ. Depends on external transistor 10mA typ. 500A max.
3. Switching voltage from VCC to Battery VCC=High Low MM1025 4.9V typ. MM1174 3.25V typ. 4. VCC-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
System Reset (with battery back-up) MM1025, 1174
Pin Assignment
1 2 8 7 6 5 3 4 5 1 2 3 4 6 7 SOP-8P (A) 8 GND GND CS VBATT VOUT VCC TRB
Pin Description
Pin No. 1 2 3 4 5 6 7 8 Pin name GND GND CS VBATT VOUT VCC TRB Function Forced switching and detection voltage adjustment
External transistor drive
Block Diagram
Absolute Maximum Ratings
(Ta=25C) Symbol TOPR TSTG IL max. IL max. VCC Pd Rating -20~+70 40~+125 80 40 -0.3~+18 300 Units C C mA mA V mW
Item Operating temperature Storage temperature Maximum output current 1 Maximum output current 2 Power supply voltage Power consumption
MITSUMI
System Reset (with battery back-up) MM1025, 1174
Electrical Characteristics
Item Consumption current 1 I/O voltage difference 1 1 MM1025 MM1174 MM1025 MM1174 MM1025 MM1174 MM1025 MM1174 MM1025 MM1174 MM1025 MM1174 MM1025 MM1174 MM1025
(Ta=25C) Symbol ICC VSAT1 IBATT VSAT2 VOUT REG-L REG-IN TCVO VTH1 VHYS IB max. VCSH VCSL Measurement conditions VCC=6V, VBATT=0V, IL=0mA VCC=3.6V, VBATT=0V, IL=0mA VCC=5V, VBATT=0V, IL=80mA VCC=3.0V, VBATT=0V, IL=200mA VCC=0V, VBATT=6V, IL=0mA VCC=0V, VBATT=3.6V, IL=0mA VCC=0V, VBATT=5V, IL=40mA VCC=0V, VBATT=3.0V, IL=20mA VCC=6V or VBATT=6V, IL=5mA VCC=3.6V or VBATT=3.6V, IL=3mA VCC : IL=0-80mA, VBATT : IL=0-40mA VCC=0V, VBATT=3.6V, IL=0~20mA VCC or VBATT=5.5~10V, IL=5mA VCC or VBATT=3.6V~10V, IL=3mA VCC or VBATT=6V, IL=5mA VCC or VBATT=3.6V, IL=3mA VCC=6V VCC=4V VCC=4V VCC=3V 4V, VBATT=6V, IL=40mA 3V, VBATT=3.6V, IL=3mA 6V, VBATT=6V, IL=40mA 4V, VBATT=3.6V, IL=3mA 8PIN 8PIN 4.8 3.1 100 15 9.0 5.0 0.01 0.01 4.9 3.25 200 30 15.0 10.0 0.10 0.10 5.1 3.4 400 60 20.0 20.0 0.50 0.50 0.50 0.50 4.8 3.14 400 150 0.15 Min. Typ. Max. Units 0.6 0.25 0.15 0.9 0.50 0.29 0.13 600 300 0.25 0.13 5.0 3.27 1.20 1.00 0.40 020 780 600 0.40 0.20 5.2 3.40 0.05 0.05 0.05 0.05 mA V A V V %/mA %/V %/C V mV mA V V
*
Consumption current 2 I/O voltage difference 2 Output voltage Load fluctuation rate Input fluctuation rate Output voltage
emperature coefficient MM1174 Switching voltage (H L) MM1025 MM1174 MM1025 MM1174 MM1025 MM1174 MM1025 MM1174 MM1025 MM1174
Hysteresis voltage Maximum base driving current CS output voltage H CS output voltage L
VCC=6V, VCC Ampere meter VCC=3.6V, VCC Ampere meter
VCC=6V, VBATT=6V, VOUT-VCS VCC=3.6V, VBATT=3.6V, VOUT-VCS VCC=4V, VBATT=6V VCC=3.0V, VBATT=3.6V
Timing Chart
VCC VTHI
VCC VBATT
VHYS VCC
VOUT
VOUT
VOUT- VCSH
CS
VCSL
MITSUMI
System Reset (with battery back-up) MM1025, 1174
Characteristics
(MM1025 series)
Output voltage and current consumption for VCC voltage supply
IBATT (mA) 1.000 VOUT 1000 /div .5000 /div VOUT (V) 5.000
Output voltage and current consumption for battery voltage supply
IBATT (mA) 100.0
VOUT
VOUT (V) 5.000
10.00 /div
.5000 /div
ICC
ICC
0000 0000
VBATT 1.000/div (V)
.0000 10.00
.0000 .0000
VBATT 1.000/div (V)
.0000 10.00 (RL=120)
(RL=120)
Output voltage and current consumption for VCC voltage supply
ICC (mA) 2.000 VOUT VOUT (V) 5.000
Output voltage and current consumption for battery voltage supply
ICC (mA) 100.0 VOUT VOUT (V) 5.000
2000 /div
.5000 /div
10.00 /div
.5000 /div
ICC .0000 .0000 .0000 10.00 .0000 .0000
ICC .0000 10.00
VCC 1.000/div (V)
VBATT 1.000/div (V)
(RL=)
(RL=)
Power supply switching voltage
VOUT (V) 5.000 ICC (mA) 100.0
.5000 /div
10.00 /div
.0000 4.0000
VCC .2000/div (V) (Ta = ambient temperature)
.0000 6.000
MITSUMI
System Reset (with battery back-up) MM1025, 1174
VCC output current (external power transistor)
Output voltage (V)
5.0 4.8 4.6 0 500 1000
VCC=6.0V VBATT=0V External Tr 2SA1020Y
VBATT output current
Output voltage (V)
IL (mA)
5.0 4.8 4.6 0 20 40 60
VCC=0V VBATT=6.0V
70
IL (mA)
VCC output current (no external power transistor)
Output voltage (V)
(No external power transistor) 5.0 4.8 4.6 0 50 100 VCC=6.0V VBATT=0V
IL (mA)
Characteristics
Current consumption (A)
(MM1174 series)
Current consumption 1-2 temperatures
Input/output voltage difference 1 temperature (external transistor 2SA1020)
Output voltage (V)
3.0 2.8 2.6 2.4 2.2 2.0
500 450 400 350 300 -25 0 25 50 75 Current consumption 2 Current consumption 1
50
100
150
200
250
Temperature (C)
IOUT (mA)
Input/output voltage difference 2 temperature
Output voltage (V)
3.0 2.8 2.6 2.87V IL=-20mA 2.85V 2.80V
Output voltage-Temperature
Output voltage (V)
VOUT=3mA 3.3 3.2 3.1
-25
0
25
50
75
-25
0
25
50
75
Temperature (C)
Temperature (C)
MITSUMI
System Reset (with battery back-up) MM1025, 1174
Maximum base drive current-Temperature
CS output voltage H-L temperature
(mV)
CS output voltage H (V)
Base current (mA)
20 15 10 5 -25 0 25 50 75
3.3 3.2 3.1 CS output voltage L -25 0 25 50 75 CS output voltage H 100
Temperature (C)
Temperature (C)
Base drive current
VCC-ICC, IBATT
ICC (mA) 5.000
20.00
5.000
IBATT
ICC
IBUFF (mA)
2.000/div IBUFF
IBUTT (mA)
.5000/div
.5000/div
ICC .0000 .0000 10.00 .0000 2.750
IBATT .0000 2.950
1.000/div VCC (V)
.0200/div VCC (V)
VCC-VOUT, VCS
VCS (V) 5.0000
5.0000
VOUT
VOUT
VOUT (V)
VCS .5000/div .500/div
.0000 0.0000
1.000/div VCC (V)
.0000 10.00
CS output voltage L

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