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| MITSUMI IC for System Reset (battery backup) MM1134 IC for System Reset (battery backup) Monolithic IC MM1134 Outline This IC protects SRAM data by setting SRAM in backup mode (setting the CE pin of SRAM low and CE pin high with CS signal) when supply voltage falls below a predetermined voltage (detection voltage 3.5V, 4.2V typ.). Then, when supply voltage is getting lower, the main power supply is switched to a battery (switching voltage 3.3V typ.) to enter backup mode with the battery. Meanwhile, when the power supply rises, first it switches to the main power supply (switching voltage 3.3V typ.) from the battey backup mode, then switches SRAM from backup mode to normal mode (by setting the CE pin of SRAM high and CE pin low). Data damage can be reliably prevented by this signal processing. ----------------------------------------------------------------------------------- Features 1. Power supply switching circuit (switching between the main power supply and a battery) 2. CS control for SRAM Normal mode: Enables access to SRAM Backup mode: Disables access to SRAM, 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) ---------------------------- 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 IC for System Reset (battery backup) MM1134 Package SOP-8C (MM1134 F) The box represents a rank of detection voltage. * Applications 1. 2. 3. 4. 5. Memory cards (SRAM cards) PCs, word processors Fax machines, photocopiers, other OA equipment Sequence controllers, other FA equipment SRAM-mounted devices such as video game devices 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 IC for System Reset (battery backup) 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 IC for System Reset (battery backup) 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 IC for System Reset (battery backup) 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 IC for System Reset (battery backup) 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 IC for System Reset (battery backup) 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 IC for System Reset (battery backup) 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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