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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 pin high) 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 SRAM 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 pin low). These signal processes provide 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.
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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 VCC=5V Current consumption D.CONT OPEN External transistor drive current MM1081 Drop voltage inside IC (input/output voltage difference) Output voltage VCC=5V Current consumption External transistor drive current (for output current increase) TC source current 3. Battery-Vcc switching voltage 4. Detection voltage (CS, CS) variable 5. Battery checker 1 X type N type 6. Battery checker 2 X type N type
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IO=10A
0.3A typ. 0.2V typ. 0.1A max.
IO=70mA IO=10mA
0.2V typ. 4.8V typ. 3.0mA max. 25mA typ. 0.25V typ. 4.75V typ. 350A max. 25mA typ. 3.0A typ. 3.3V typ. 4.2V typ. 2.70V typ. 2.50V typ. 2.55V typ. 2.35V typ.
IO=120mA IO=120mA
Package
TSOP-20A (MM1027XV, MM1027NV, MM1081XV) SOP-16A (MM1027XF, MM1027NF) DIP-16A (MM1027XD)
MITSUMI
System Reset (with battery back-up) MM1027, 1081
Applications
1. 2. 3. 4. IC memory cards (RAM cards) PCs, word processors Fax machines, photocopiers, other office equipment Other equipment with S-RAMs (equipment requiring back-up)
Pin Assignment
16 15 14 13 12 11 10 9 20 19 18 17 16 15 14 13 12 11
12345678 SOP-16A/DIP-16A
1 2 3 4 5 6 7 8 9 10 TSOP-20A
Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Function TSOP-20A GND ADJ. NC TC NC CS NC
-------------------------
SOP-16A GND NC ADJ. TC CS NC
-------------------------
DIP-16A GND NC ADJ. TC CS NC
-------------------------
CS
CS
CS NC DET.CONT Bat.DET1 NC Bat.DET2 NC Battery NC VOUT NC External drive VCC
DET.CONT Bat.DET1 NC Bat.DET2 Battery VOUT External drive NC VCC
DET.CONT Bat.DET1 NC Bat.DET2 Battery VOUT External drive NC VCC
MITSUMI
System Reset (with battery back-up) MM1027, 1081
Block Diagram
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage Operating voltage Allowable loss Output current
(Ta=25C) Symbol TSTG TOPR VCC max. VCCOP Pd IO1 IO1 IO2 Rating -40~+125 -20~+70 7 7 300 90 120 200 Units
C C
V V mW mA mA A
MM1027 MM1081
Output current
Note : IO1 expresses VCC output current value, and IO2 expresses VBATT output current value.
Electrical Characteristics
Item Consumption
All circuits
(Except where noted otherwise, Ta=25C, VCC=5V, VBAT=3V) Symbol Measurement conditions VCC=5V, VBAT=3V, IO=0mA ICC1 D.CONT pin : OPEN VCC=5V, VBAT=3V, IO=0mA ICC2 VS1 VS1 VS/ VS2 VS2 VCSL VCSH ICSH T VCC=H L, VBAT=3V H VCC=5V, VBAT=3V, IO=0mA D.CONT pin : GND VCC=H L, VBAT=3V, ADJ pin : OPEN VCC=L H Min. Typ. Max. Units 0.9 150 1.2 1.7 3.0 mA A mA V V %/C V V V V A
MM1027 MM1081 MM1027
current 1 Consumption current 2
210 350 2.2 3.5
CS, CS detection voltage 1 CS, CS hysteresis voltage 1 Detection voltage
--------------------------------
4.05 4.20 4.35 0.05 0.10 0.20 0.08 0.06
MM1027
temperature characteristic MM1081
CS*CS circuit CS, CS detection voltage 2 unit
ADJ pin : 12k PULL UP (to VCC) VCC=L VCC=3V, ICS=3A VCC=5V, ICS=-3A VCC=5V, VCS=4.6V current measured
3.25 3.50 3.75 0.05 0.10 0.20 0.05 0.10 4.85 4.95 8 15
CS, CS hysteresis voltage 2 CS output voltage L CS output voltage H CS source current
MITSUMI
System Reset (with battery back-up) MM1027, 1081
Electrical Characteristics
Item CS sync current CS output voltage L
---------------------------------------------------
(Except where noted otherwise, Ta=25C, VCC=5V, VBAT=3V) Symbol ICSL VCSL ICSL
-----------------------------------------------------------------------------------------
Measurement conditions VCC=3.5, VCS=0.4V Current measured VCC=5V, ICS=3A VCC=4V, VOUT-VCSH, ICS=-3A VCC=5V, VCS=0.4V Current measured Minimum power supply voltage at which CS pin can hold low level VCS < 0.4V = VCC=L VCC=H VCC=L VCC=H H, TC : OPEN, C1=47pF L, TC : OPEN, C1=47pF H, TC : 1nF, C1=47pF L, TC : 1nF, C1=47pF L (to VCC) H(to VCC) L (to VCC) H (to VCC)
Min. Typ. Max. Units 0.5 0.3 2.0 mA V V mA V S S mS S V V V V V mA A V V V mA V V %/C A A A 0.10 0.25 0.14 0.40 1.0 2.0 30 2.0 0.8 2.0 2.4 5 10
CS output voltage H
--------------------------
VCSH
CS sync current
--------------------------
CS CS circuit Operation limit voltage L unit ON delay time 1
*
VOPL tPLH1 tPHL1 tPLH2 tPHL2
OFF delay time 1 ON delay time 2 OFF delay time 2 BATT MM1027X
detection voltage 1 MM1081N BATT hysteresis voltage 1 BD BATT MM1027X
VBD1 VBD1 VBD2 VBD2 VBDL IBDSNK IBDH
VCC=5V, R1=10k PULL UP VBAT=H VBAT=L VBAT=H VBAT=L VCC=5V, R1=10k PULL UP VCC=5V, R2=10k PULL UP VCC=5V, R2=10k PULL UP VCC=5V, VBAT=0V VCC=5V, VBAT=0V, VBD=4V VCC=5V, VBAT=3V, VBD=5V VCC=5V, IO=70mA VCC=5V, IO=120mA VBAT=3V, IO=10A VBAT=3V, IO=100A VCC=5V, V (TB) =4.5V VCC=H VCC=L L, VBAT=3V H, VBAT=3V
2.60 2.70 2.80 0.05 0.10 0.20 2.45 2.55 2.65 0.05 0.10 0.20 1.0 16 0.2 3.0 0.2 0.2 0.3 25 0.4 0.2 0.3 0.3 0.4 -
circuit detection voltage 2 MM1081N unit BATT hysteresis voltage 2 BD output voltage L BD output sink current Leakage current I/O voltage difference 1 MM1027 MM1081
VSAT1 VSAT2 VSAT3 IBUD VBB VBB
0.25 0.4
I/O voltage difference 2 I/O voltage difference 3 External transistor driving current Backup Power supply switching voltage circuit Hysteresis voltage unit Switching voltage MM1027
3.15 3.30 3.45 0.05 0.10 0.20 0.08 0.06
temperature characteristic MM1081 Loss current
VBB/ T ILOS IOREV ITCSCE VCC=0V, VBAT=3V, IO=0A D.CONT pin : GND VCC=0V, VBAT=3V, IO=0A D.CONT pin : OPEN VCC=5V, VTC=0V
2.0
3.0
0.3 0.1 5.0
Reverse current TC source current
MITSUMI
System Reset (with battery back-up) MM1027, 1081
Timing Chart
VS1
VCC VBATT
VS VBB VBD2 VBD1 VBD1
VBB VBD2
VOUT CS CS VBD1 VBD2
MITSUMI
System Reset (with battery back-up) MM1027, 1081
Application Circuits
(Example : MM1027XV)
MITSUMI
System Reset (with battery back-up) MM1027, 1081
Characteristics
(MM1027X)
CS pin ON delay time VS. Capacitance
100m 10m
ON delay time OFF delay time Vs. Capacitance
Delay time (S)
1m 100 10
OFF delay time ON delay time
1 1p 10p 100p 0.001 0.01 0.1
Capacitance (F)
Note : CS and CS output waveforms may be disturbed if delay time is more than 10mS.
-----------------------------
Characteristics
(MM1027 series)
Current consumption
I (mA) 5.000
Loss current during back-up
IB (A) 2.400 VBAT=3V, IO=0A
.5000 /div CCONT GND CCONT OPEN
0 .6000 /div
.0000 .0000
VI
.5000/div (V)
5.000
-3.600 .0000
VI
.5000/div (V)
5.000
Output voltage 1
VO (V) VBAT=3V 5.000 5.000 VCC VOUT .1000 /div
Shot key barrier diode reverse current
IB (A) 2.700 VBAT=0
0
.5000 /div
.9000 /div
-6.300 .0000 .0000
IO
.8000/div (mA)
4.000 -80.00
.0000
VI
.5000/div (V)
5.000
MITSUMI
System Reset (with battery back-up) MM1027, 1081
Output voltage 2 3
VO (V) 3.000 VCC=0V
ICS-VCS 1
ICS (mA)
-20.00
.1000 /div
2.000 /div
2.000 .0000
IO
10.00/div (V)
-100.0 .0000 .0000 5.000
VCS
.5000/div (V)
CS pin Sink current VCC=4.5V VCS=Variable
ICS-VCS 2
ICS (mA)
ICS-VCS
ICS (mA)
-5.000
5.000
5.000 /div
.5000 /div
VCC=5V VCS=Variable
.0000 .0000
VCS
.3500/div (V)
3.500
0000 000
5.000
VCS
.5000/div (V)
CS pin Sink current VCC=3.5V VCS=Variable
MITSUMI
System Reset (with battery back-up) MM1027, 1081
ON delay time-Temperature
PPM 800 Tc pin (CT=1000PF60PPM/C)
CS detection voltage adjustment (ADJ pin)
CS detection voltage
Detection voltage (V)
Delay time
750 700 -770 PPM/C -25 0 25 -706 PPM/C 50 75 100 125
4.0
max. typ. min.
3.0
2.0 10 100
Ambient temperature (C)
Resistor R1 (k)
How to Adjust Detection Voltage Vs1
1. Connecting a resistor between ADJ pin and Vcc pin (effective only when lowering detection voltage) Calculated min. and max. values take into account resistance, etc. variance inside the IC. Refer to Figure 1 2. Using resistors to divide Vcc potential and connect to ADJ pin Detection voltage can be determined close to external resistance value by setting external R2 and R3 values small. Refer to Figure 2
(However, current increases when R2 and R3 are made smaller, so set at around R2+R3=6k.)
MITSUMI
System Reset (with battery back-up) MM1027, 1081
CS detection voltage adjustment (ADJ pin)
CS detection voltage adjustment (ADJ pin)
Detection voltage
5
4
max. typ. min.
3
0
1
2
3
4
Resistor R2 (k)
CS Output
0.5mS 2V/Div 0.5mS 2V/Div
VCC
VCC
CS
CS
*TC pin
-----------------------------------------
OPEN
*TC pin
1000pF
CS Output
0.5mS 2V/Div
VCC
VCC
CS
CS
*TC pin
OPEN
*TC pin
1000pF
MITSUMI
System Reset (with battery back-up) MM1027, 1081
Characteristics
(MM1081 series)
Input/output voltage difference 1 (Vcc=5.0V)
Output voltage (V)
5.0
CS-CS detection voltage-Temperature
--------------------------
(V) 4.30
LH
4.5
4.25 4.20 50 60 70 80 90 100 110 120 130 140 150 4.15 4.10 -25 0 25 50
HL
4.0
Output current (mA)
75
TEMP(C)
VCC-ICC
ICC (A) 300.0 VOUT-CS 47k
Power supply switching voltage-Temperature
(V) 3.45 3.40 3.35 3.30 3.25 HL
LH
CS open 30.00/div
.0000 0.0000
-25 .5000/div 5.000 VCC (V)
0
25
50
75
TEMP(C)
Timing Chart
5V 3.6V 4.3V 3.4V 3.0V 2.50V 2.35V 4.2V 3.5V 3.4V3.6V 4.3V 3.3V
2.38V 2.53V
4.2V3.5V 3.3V
VCC VBATT VOUT CS
CS BD1,BD2 D.CONT:OPEN BD1 D.CONT:GNO BD2 D.CONT:GNO
--------------------------
The broken lines for CS and CS indicate timing when the ADJ pin is pulled up to VCC by 12k.

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