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| MITSUMI System Reset (with battery back-up) MM1290 System Reset (battery back-up) Monolithic IC MM1290 Outline These ICs protect S-RAM data in back-up mode (CS signal makes S-RAM CE pin low and CE pin high) when power supply voltage goes below a certain set voltage (detection voltage 4.6V 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 3.5V 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. ------------------------------------------ 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. Back-up output V01 and V02 output circuit built in. 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=6V 3. Output voltage2 VCC=6V 3. Detection voltage RESET PREEND 2.7A typ. 0.03V typ. 0.5A max. 0.2V typ. 5.0V typ. 5.0V typ. IO=100A IO=50mA IO1=50mA IO2=30mA A : 2.55V typ. B : 2.70V typ. Package SOP-8A 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 MITSUMI System Reset (with battery back-up) MM1290 Pin Assignment Pin no. 1 2 3 4 5 6 7 8 Pin name GND PREEND VBAT CS RESET VO1 VIN VO2 8 7 6 5 1 2 3 4 SOP-8A (TOP VIEW) Block Diagram VO1 22 6 7 VIN 22 Reg1 3 VSW2 PRESET ctrl PREEND VBAT 2 PREEND 22000P 4 CS 1000P CS 5 VSW1 VZ RESET 0.1 Reg2 8 VO2 22 1 GND Recommended Operating Conditions Item Storage temperature Operating temperature Allowable loss Symbol TSTG TOPL Pd Rating -40~+125 -20~+75 300 Unit C C mW MITSUMI System Reset (with battery back-up) MM1290 Absolute Maximum Ratings (Ta=25C) Symbol VIN max. VBAT max. VI max. IO1 IO2 Rating -0.3~+16 -0.3~+12 -0.3~+10 0~80 0~60 Unit V V V mA mA Item Power supply voltage 1 Power supply voltage2 (BACK UP) Pin Voltage Output current 1 Output current 2 Electrical Characteristics Item Synthesis Current consumption 1 Current consumption 2 Current consumption 3 Regulator Output voltage1 Input-Output differential Voltage1 Load Regulation1 Line Regulation1 VOUT Temperature Coefficient1 Output voltage2 Input-Output differential Voltage2 Load Regulation2 Line Regulation2 VOUT Temperature Coefficient2 Reset CS detection voltage Detection voltage temperature coefficient 1 CS sync current CS operating voltage RESET detection voltage RESET hysteresis Detection voltage temperature coefficient 2 RESET sync current PREEND detection voltage PREEND hysteresis Detection voltage temperature coefficient 3 PREEND sync current RESET, PREEND operating voltage Symbol (Except where noted otherwise, VIN=6.0, Ta=25C) Measurement conditions Min. Typ. Max. Unit IIN IBAT1 IBAT2 VO1 VIO1 VO1 VI1 VO1 Ta VO2 VIO2 VO2 VI2 VO2 Ta VSL1 Vg1 Ta ISINK1 VOPL1 VSL2 VS2 VSL2 Ta ISINK2 VSL3 VS3 VS3 Ta ISINK3 VOPL2 VIN=6V VBAT=3V, VIN=6V VBAT=3V Ta=25C VIN=6V, IO1=50mA VIN=6V, IO1=50mA IO1=0~50mA IO1=50mA Ta=-20~+75C VIN=VO+1V, IO2=30mA VIN=4.5V, IO2=30mA IO2=0~30mA IO2=30mA Ta=-20~+75C 4.85 4.85 40 0.3 2.7 5.0 0.2 0.01 0.01 0.01 5.0 0.2 0.01 0.01 80 0.6 4.5 A A A 5.15 V 0.35 V 0.03 %/mA 0.2 %/V %/C 5.15 V 0.35 V 0.03 %/mA 0.2 %/V 0.01 0.20 %/C VIN=H L Ta=-20~+75C VO=0.5V, VIN=VBAT=2V VIN or VBAT ICS=50A, VOP=0.4V VO1=H L VO1=H L H Ta=-20~+75C VOP=0.4V, VIN=VBAT=2V VBAT=H L VBAT=H L H Ta=-20~+75C VOP=0.4V, VIN=VBAT=2V VIN or VBAT VOP=0.4V IR=IP=50A 4.485 4.600 4.715 0.01 V %/C 1.5 mA 1.6 16 V 2.499 2.550 2.601 V 45 90 180 mV 0.01 %/C 1.5 mA 2.646 2.700 2.754 V 110 140 250 mV 0.01 1.5 1.6 %/C mA V 16 MITSUMI System Reset (with battery back-up) MM1290 Electrical Characteristics Item Switch Switch voltage CS output prohibition voltage VBAT SW Leakage Current Input-Output differential Voltage Switch Temperature Coefficient CS voltage prohibition Temperature Coefficient Symbol (Except where noted otherwise, VIN=6.0, Ta=25C) Measurement conditions Min. Typ. Max. Unit VSW1 VSW2 ILEAK VIOSW VSW1 Ta VSW2 Ta VBAT=3V, VIN voltage detection VBAT=3V, VO1 voltage detection VIN=6V, VBAT=0V VIN=OPEN, VBAT=2.65V, IOUT=100A Ta=-20~+75C Ta=-20~+75C 3.400 3.500 3.600 V 4.550 4.700 4.850 V 0.5 A 30 60 mV 0.01 0.01 %/C %/C Timing Chart VIN (V) 5 0 VO2 (V) 5 0 VO1 (V) 5 0 VBAT (V) 5 0 CS (V) 5 0 PREEND (V) 5 0 RESET (V) 5 0 CS, PREEND RESET is pull-up to VOUT |
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