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MITSUMI
System Reset (with battery back-up) MM1134
System Reset (with battery back-up)
Monolithic IC MM1134
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 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
1 Power supply switching circuit (switching between main power supply and battery) 2 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) 3 With CS signal gate circuit
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)
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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.
MITSUMI
System Reset (with battery back-up) MM1134
Package
SOP-8C (MM1134 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. 1 2 3 4 5 6 7 8 Pin name GND RESET CS VBATT CS VOUT Y VCC
8
7
6
5
1
2
3
4
SOP-8C (TOP VIEW)
Block Diagram
MITSUMI
System Reset (with battery back-up) MM1134
Equivalent Circuit Diagram
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage Operating voltage Allowable loss Output current Output current
(Ta=25C) Symbol TSTG TOPR VCC max. VCCOP Pd IO1 IO2 Rating -40~+125 -20~+75 -0.3~7 -0.3~7 300 80 200 Units C C V V mW mA A
Note : IO1 expresses VCC output current value, and IO2 expresses VBATT output current value.
MITSUMI
System Reset (with battery back-up) MM1134
Electrical Characteristics
Item Consumption current I/O voltage difference 1 Output voltage 1 Output voltage 2 Output voltage 3 Detection voltage Hysteresis voltage Reset output voltage L Reset leakage current H Reset operation limit voltage CS output voltage L CS output voltage H CS output voltage L CS output voltage H Symbol ICC VSAT1 VO1 VO2 VO3 VS VS VRSL IRSH VOPL VCSL VCSH VCSL VCSH
Typical model: MM1134B(Except where noted otherwise, Ta=25C, VCC=VRS=5V, RRS=10k) Measuring circuit 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2
Measurement conditions VCC=5V, VBATT=3V, IO1=0mA VCC=5V, VBATT=3V, IO1=1mA VCC=5V, VBATT=3V, IO1=1mA VCC=5V, VBATT=3V, IO1=15mA VCC=5V, VBATT=3V, IO1=50mA VCC=H L VCC=L H VCC=3.7V VCC=5V, VRS=7.0V VRSL0.4V, VCC=H L VCC=3.7V, VBATT=3V, ICS=1A VCC=5V, VBATT=3V, ICS=-1A VCC=5V, VBATT=3V, ICS=1A, VY=0V VCC=3.7V, VBATT=3V, ICS=-1A, VY=0V VCC=5V, VBATT=3V, ICS=-1A, VY=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 VY=L H, CL=15pF VY=H L, CL=15pF
Min. Typ. Max. Units 1.4 0.03 4.97 4.90 4.80 4.20 100 0.2 0.01 0.8 2.2 0.05 mA V V V V V mV V A V V V V V 0.05 %/C 3.30 3.45 V 100 200 mV 0.05 %/C 0.3 0.5 A 0.2 0.3 V 2.8 V 2.7 V 0.1 A 150 400 A 8 20 ns 8 20 ns 1.25 V
4.95 4.75 4.70 4.00 50
4.40 200 0.4 0.1 1.2 0.1 0.2
4.90
VO-0.1
Detection voltage temperature characteristic VS/ T Power supply switching voltage VB Hysteresis voltage VB Switching voltage temperature characteristic VB/ T Loss current IBL I/O voltage difference 2 Vsat2 Output voltage 4 VO4 Output voltage 5 VO5 Reverse current IOREV Y pin Lo level current IYLO Y pin tpLH Pin transmission delay time tpHL Reference voltage (typical) VREF Note :
3.15 50
2.7 2.6
* *
When input pulse rise and fall time is less than 6Nsec.
MITSUMI
System Reset (with battery back-up) MM1134
Measuring circuit 1
V RS A 1 8 C1 R RS
10k 0.1F
ICC A VCC
VRS V
2 MM1134 3
7 A IVLO
6 C2 V VO IO
ICS
V VCS
0.1F
A VBATT V I BATT
4
5 V V CS I CS
MITSUMI
System Reset (with battery back-up) MM1134
Measuring circuit 2
1 RRS 10k 2 MM1134 3
8 C1
0.1F
VCC
7 VY 6 C2
0.1F
4 V BATT
5 CL Oscilloscope
15pF
VCC INPUT(VY)
50% GND
VCSH OUTPUT(VCS)
0.5VCC
GND tpLH tpHL
MITSUMI
System Reset (with battery back-up) MM1134
Timing Chart
VE VS
VS VB VOPL
VCC Y
VRSL
*VY
0V 0V
RESET CS
VCSL VCSL 0V
CS VCSL VOUT
VO4,O5
VCSL 0V VO1,O2,O3 0V
= * Use Y pin input voltage at less than 5V when VCC < Vs.
Characteristics
VOUT-IOUT (VCC=5.0V)
(V) 5.000
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)
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)
MITSUMI
System Reset (with battery back-up) MM1134
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)

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