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
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
V
BATT
V
OUT
V
CC
TRB
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin name
GND
GND
CS
V
BATT
V
OUT
V
CC
T
RB
Function
Forced switching and detection voltage adjustment
External transistor drive
Block Diagram
Absolute Maximum Ratings
(Ta=25
°
C)
Symbol
T
OPR
T
STG
I
L
max.
I
L
max.
V
CC
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=25
°
C)
Symbol
I
CC
V
SAT
1
I
BATT
V
SAT
2
V
OUT
REG-L
REG-IN
TC
VO
V
TH
1
V
HYS
I
B
max.
V
CSH
V
CSL
Measurement conditions
V
CC
=6V, V
BATT
=0V, I
L
=0mA
V
CC
=3.6V, V
BATT
=0V, I
L
=0mA
V
CC
=5V, V
BATT
=0V, I
L
=80mA
V
CC
=3.0V, V
BATT
=0V, I
L
=200mA
V
CC
=0V, V
BATT
=6V, I
L
=0mA
V
CC
=0V, V
BATT
=3.6V, I
L
=0mA
V
CC
=0V, V
BATT
=5V, I
L
=40mA
V
CC
=0V, V
BATT
=3.0V, I
L
=20mA
V
CC
=6V or V
BATT
=6V, I
L
=5mA
V
CC
=3.6V or V
BATT
=3.6V, I
L
=3mA
V
CC
: I
L
=0-80mA, V
BATT
: I
L
=0-40mA
V
CC
=0V, V
BATT
=3.6V, I
L
=0~20mA
V
CC
or V
BATT
=5.5~10V, I
L
=5mA
V
CC
or V
BATT
=3.6V~10V, I
L
=3mA
V
CC
or V
BATT
=6V, I
L
=5mA
V
CC
or V
BATT
=3.6V, I
L
=3mA
V
CC
=6V
V
CC
=4V
V
CC
=4V
V
CC
=3V
4V, V
BATT
=6V, I
L
=40mA
3V, V
BATT
=3.6V, I
L
=3mA
6V, V
BATT
=6V, I
L
=40mA
4V, V
BATT
=3.6V, I
L
=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
µA
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
V
CC
=6V, V
CC
Ampere meter
V
CC
=3.6V, V
CC
Ampere meter
V
CC
=6V, V
BATT
=6V, V
OUT
-V
CS
V
CC
=3.6V, V
BATT
=3.6V, V
OUT
-V
CS
V
CC
=4V, V
BATT
=6V
V
CC
=3.0V, V
BATT
=3.6V
Timing Chart
V
CC
V
THI
V
CC
V
BATT
V
HYS
V
CC
V
OUT
V
OUT
V
OUT
- V
CSH
CS
V
CSL
MITSUMI
System Reset (with battery back-up) MM1025, 1174
Characteristics
(MM1025 series)
Output voltage and current consumption
for V
CC
voltage supply
I
B
ATT
(mA)
1.000
V
OUT
1000
/div
.5000
/div
V
OUT
(V)
5.000
Output voltage and current consumption for
battery voltage supply
I
BATT
(mA)
100.0
V
OUT
V
OUT
(V)
5.000
10.00
/div
.5000
/div
I
CC
I
CC
0000
0000
V
BATT
1.000/div (V)
.0000
10.00
.0000
.0000
V
BATT
1.000/div (V)
.0000
10.00
(R
L
=120Ω)
(R
L
=120Ω)
Output voltage and current consumption
for V
CC
voltage supply
I
CC
(mA)
2.000
V
OUT
V
OUT
(V)
5.000
Output voltage and current consumption for
battery voltage supply
I
CC
(mA)
100.0
V
OUT
V
OUT
(V)
5.000
2000
/div
.5000
/div
10.00
/div
.5000
/div
I
CC
.0000
.0000
.0000
10.00
.0000
.0000
I
CC
.0000
10.00
V
CC
1.000/div (V)
V
BATT
1.000/div (V)
(RL=∞)
(R
L
=∞)
Power supply switching voltage
V
OUT
(V)
5.000
I
CC
(mA)
100.0
.5000
/div
10.00
/div
.0000
4.0000
V
CC
.2000/div (V)
(Ta = ambient temperature)
.0000
6.000
MITSUMI
System Reset (with battery back-up) MM1025, 1174
V
CC
output current (external power transistor)
Output voltage (V)
5.0
4.8
4.6
0
500
1000
V
CC
=6.0V
V
BATT
=0V
External Tr 2SA1020Y
V
BATT
output current
Output voltage (V)
IL (mA)
5.0
4.8
4.6
0
20
40
60
V
CC
=0V
V
BATT
=6.0V
70
IL (mA)
V
CC
output current (no external power transistor)
Output voltage (V)
(No external power transistor)
5.0
4.8
4.6
0
50
100
V
CC
=6.0V
V
BATT
=0V
IL (mA)
Characteristics
Current consumption (µA)
(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)
I
OUT
(mA)
Input/output voltage difference 2 temperature
Output voltage (V)
3.0
2.8
2.6
2.87V
I
L
=-20mA
2.85V
2.80V
Output voltage-Temperature
Output voltage (V)
V
OUT
=3mA
3.3
3.2
3.1
-25
0
25
50
75
-25
0
25
50
75
Temperature (°C)
Temperature (°C)
