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MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
System Reset (with battery back-up)
Monolithic IC MM1026, 1245, 1080 ,1134
Outline
These ICs protect S-RAM data in back-up mode (CS signal makes R-SAM CE pin low and CE pin high) when power supply voltage goes below a certain set voltage (detection voltage 3.5V, 4.2V or 4.5V typ.). Further, it switches from main power supply to battery back-up when power supply voltage drops. Conversely, when power supply rises, it first switches the S-RAM from battery back-up to main power supply (switching voltage 3.3V typ.), then from back-up mode to normal mode (CS signal makes S-RAM CE pin high and CE pin low). These signal processes provide reliable protection against data damage.
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Features
MM1026 * Power supply switching circuit (switching between main power supply and battery) * CS control for S-RAM (normal mode : S-RAM can be accessed; back-up mode: S-RAM can not be accessed low current consumption mode) * Reset output MM1245 * Power supply switching circuit * CS control for S-RAM * CS control signal delay, power supply line chattering removal approx. 1S max. * Supply current from main power supply can be increased by external power transistor MM1080 * Power supply switching circuit * CS control for S-RAM * Low current consumption 60A typ. MM1134 * Power supply switching circuit * CS control for S-RAM * Gate circuit with CS signal
Characteristics
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 1. Drop voltage inside IC (input/output voltage difference) 2. Output voltage VCC=5V 3. Battery-VCC switching voltage 4. Detection voltage (CS, CS, reset output)
----------------------------
IO=100A
0.3A typ. 0.3V typ. 0.1A max. 0.2V typ. 4.8V typ. 3.3V typ.
IO=50A IO=50mA A : 3.5V typ. B : 4.2V typ. C : 4.5V typ.
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
Package
DIP-8B (MM D) SOP-8C (MM F) contains detection voltage rank.
*
Applications
1. 2. 3. 4. 5. Memory cards (S-RAM cards) PCs, word processors Fax machines, photocopiers, other office equipment Sequence controllers, other FA equipment Video games and other equipment with S-RAMs
Pin Assignment
Pin no. 8 7 6 5 1 2 3 4 5 6 7 8 MM1026 GND RESET CS VBATT CS VOUT NC VCC Pin name MM1245 MM1080 GND GND TC NC CS CS VBATT VBATT NC CS VOUT VOUT Tr.B NC VCC VCC MM1134 GND RESET CS VBATT CS VOUT Y VCC
1
2
3
4
DIP-8P(C)/SOP-8P(C)/SOP-8P(C) Taping
Block Diagram
MM1026
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
MM1245
MM1080
MM1134
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
Equivalent Circuit Diagram
MM1026
MM1245
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
MM1080
MM1134
Absolute Maximum Ratings
(Ta=25C) Symbol TSTG TOPR VCC max. VCCOP Pd Rating -40~+125 -20~+75 7 7 300 80 50 200 Units C C V V mW mA mA A
Item Storage temperature Operating temperature Power supply voltage Operating voltage Allowable loss MM1245 MM1026 Output current MM1134 MM1080 Output current
IO1 IO2
Note : IO1 expresses VCC output current value, and IO2 expresses VBATT output current value.
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
Electrical Characteristics
Item
(Except where noted otherwise, Ta=25C, VCC=VRS=5V, RRS=10k) Symbol Measurement conditions Min. Typ. Max. 2.0 0.6 1.0 1.4 60 120 1.4 2.2 0.03 0.05 4.95 4.97 0.15 0.30 4.75 4.5 4.7 3.35 4.05 4.30 4.90 4.7 0.30 4.8 3.50 4.20 4.50 100 20 Units mA mA A mA V V V V V 0.50 3.65 4.35 4.70 V V V V mV mA V A V V V V V %/C S S A A V mV %/C A V V V A A V
MM1026 MM1245 MM1080 MM1134 I/O voltage difference 1 Output voltage 1 I/O voltage difference 2 MM1245 MM1026 Output voltage 2 MM1134 MM1080 I/O voltage difference 3 MM1245 Output voltage 3 Except MM1245 A type Detection voltage B type C type Hysteresis voltage Maximum base MM1245 driving current Reset output voltage L MM1026 Reset leakage current H MM1134 Reset operation limit voltage CS output voltage L MM1080 CS output voltage H (CS only) MM1026 CS output voltage L MM1245 CS output voltage H MM1134 Detection voltage temperature characteristic ON delay time MM1245 OFF delay time TC pin charge current MM1245 CS source current Power supply switching voltage Hysteresis voltage Switching voltage temperature characteristic Loss current I/O voltage difference 2 Output voltage 4 Output voltage 5 Reverse current Y pin LO H MM1134 level current Reference voltage (typical) Consumption current
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ICC
VCC=5V, VBATT=3V, IO1=0mA
VSAT1 VO1 VSAT2 VO2 VSAT3 VO3 VS VS IBUF VRSL IRSH VOPL VCSL VCSH VCSL VCSH VS/ T TdON TdOFF ITC ICSSOU VB VB VB/ T IBL Vsat2 V04 V05 IOREV IYLO VREF
VCC=5V, VBATT=3V, IO1=1mA VCC=5V, VBATT=3V, IO1=1mA VCC=5V, VBATT=3V, IO1=30mA VCC=5V, VBATT=3V, IO1=15mA VCC=5V, VBATT=3V, IO1=30mA VCC=5V, VBATT=3V, IO1=80mA VCC=5V, VBATT=3V, IO1=50mA VCC=H L VCC=L H VCC=5V, VBUF=4.5V VCC=3V VCC=5V, VRS=7.0V VRSL < 0.4V, VCC=H L = VCC=3.7V, VBATT=3V, ICS=1A VCC=5V, VBATT=3V, ICS=-1A VCC=5V, VBATT=3V, ICS=1A VCC=3.7V, VBATT=3V, ICS=-1A CTC=OPEN CTC=OPEN VCC=5V, VBATT=3V, VTC=0V VCC=5V, VBATT=3V, VCS=4.5V VCC=H L VCC=L H VCC=0V, VBATT=3V, IO2=0A VCC=0V, VBATT=3V, IO2=1A VCC=0V, VBATT=3V, IO2=1A VCC=0V, VBATT=3V, IO2=100A VCC=5V, VBATT=0V VCC=5V, VBATT=3V, VY=0V
14
26
0.2 0.4 0.01 0.1 0.8 1.2 0.1 4.90 0.1 VO-0.1 0.05 50 5 0.80 50 3.30 100
0.60 25 3.15
1.10 80 3.45 0.05 0.1 0.3
2.7 2.6
0.2 2.8 2.7
0.1 150 1.25 400
Note : Detection voltage ranks
A, B B B, C
MM1026 MM1134, MM1080 MM1245
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
Timing Chart
MM1026
VE VS
VS VB VOPL
MM1245
VE VS
VCC
VCC TC
VS VB VOPL
VTH Set inside IC Delay
RESET
VRSL
VRSH 0V
CS
VCSH
VCSL 0V
CS CS VOUT
VCSL
VCSL
CS
VCSL
VCSH 0V
VCSL
VCSL
VOUT
VO4,O5
VO1,O2,O3 0V
VO1,O2,O3 VO4,O5
MM1080
VE VS VS VB
MM1134
VE VS
VS VB VOPL
VCC
VCC Y
*VY
0V VRSL 0V
BATTERY
0V
RESET CS
VCSL VCSL 0V
CS
VCSL
VCSL
0V
4.8V
VOUT 2.8V
0V
VO1,O2
CS VCSL
0V
VCSL 0V
VO3,O4
VOUT
VO4,O5
VO1,O2,O3
0V
*
Characteristics
(V) 5.000
Use Y pin input voltage at less than 5V when VCC < Vs. =
---------------------
(MM1026, MM1134 series)
VOUT-IOUT (VCC=5.0V)
VOUT-IOUT (VBAT=3.0V)
3.000
VOUT (V)
VOUT (V)
.0500/div
0.100/div
4.500 .0000
2.000 10.00/div -100.0 0 0.100/div 1.000
IOUT (mA)
IOUT (mA)
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
VCC-IBAT
40.00
VCC-ICC
5.000
IBAT (nA)
ICC (mA)
5.000/div
.5000/div
0 -10.00 0 1.000/div 10.00 .0000 .0000
1.000/div 10.00
VCC (V)
VCC (V)
Current consumption-Temperature characteristics
Current consumption (mA)
2.0
Output voltage 1, 2-Temperature characteristics
0.3
Output voltage 1, 2 (V)
0.2
IOL=50mA
1.0
0.1
IOL=10mA
0.0
-50
0
50
100
-50
0
50
100
Ambient temperature (C)
Ambient temperature (C)
Output voltage 3, 4-Temperature
Output voltage 3, 4 (V)
0.5 0.4 0.3 0.2 0.1 0 -50 0 50 IOL=100A
IOL=1A
100
Ambient temperature (C)
Reverse current-Temperature
1A
Loss current-Temperature
1A
Reverse current
Loss current
50 100
100nA
100nA
10nA
10nA
-80 -50 0
-80-50 0
50 100
Ambient temperature (C)
Ambient temperature (C)
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
Characteristics
VOUT (V) 5.000
(MM1080 series)
Current consumption-Temperature (Vcc=5V)
VIN-IIN
IIN (A) 100.0
0.5000 /div
10.00 /div
0.0000 .0000
IOUT
10.00/div (mA) 100.0
.0000 .0000
VIN
.5000/div (V)
5.000
VOUT-IOUT (VBAT-3.0V)
VOUT (V) 5.000
VIN-IBATT
IBATT (A) 1.000
.5000 /div
.2000 /div 0
.0000 .0000
IOUT
20.00/div (A)
200.0
-1.000 .0000
VIN
.5000/div (V)
5.000
Current consumption-Temperature (VCC=5V)
(A) 80 70
VBAT detection voltage-Temperature
(V) 3.3 3.2 VBAT detection voltage 150 3.1 100 50 (mV)
60 50 3.0 -25 0 25 50 75 TEMP (C) Hysteresis voltage
-25
0
25
50 75 TEMP (C)
CS detection voltage-Temperature
(V) 4.5 4.0 3.5 150 100 Hysteresis voltage -25 0 25 50 75 TEMP (C) CS detection voltage (mV)
Hysteresis voltage
Hysteresis voltage
MITSUMI
System Reset (with battery back-up) MM1026, 1245, 1080, 1134
Characteristics
IOUT-VOUT
5.00 4.90 4.80 4.70 4.60 VOUT 4.50 4.40 4.30 4.20 4.10 4.00 5 25
(MM1245 series)
Current consumption-Temperature
Current consumption (mA)
1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8
VOUT-CS 47k CS open
-25 0 25 50 75
45
65
85
105
125
IOUT (mA)
Temperature (C)
CS detection voltage-Temperature
voltage (V)
4.4 4.35 4.3 4.25 4.2 4.15 4.1 -25 0 25 50 75
CS-CS pin ON/OFF delay time vs. capacitance TC
10 1
Delay time (S)
100m 10m 1m 100 10
OFF delay time ON delay time
Temperature (C)
VBAT detection voltage-Temperature
3.5 3.45 3.4 3.35 3.3 3.25 3.2 -25 0 25 50 75
1
10p 100p 0.001 0.01 0.1
1
Capacitance (F)
Use 1S max. for CS-CS pin ON delay time.
Voltage (V)
Temperature (C)

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