MITSUMI System Reset (with battery back-up) MM1025, 1174 System Reset (with battery back-up) Monolithic IC MM1025, 1174 Outline These ICs were developed for D-RAM and dummy S-RAM battery back-up. D-RAM and dummy S-RAM power supplies differ from that of S-RAMs because 5V or 3.3V of power supply is required even during battery back-up. Therefore, these ICs provide voltage from a stable power supply during both normal operation and back-up. Also, the internal stable power supply switches automatically to battery back-up if the main power supply voltage goes down for any reason. Features 1. Battery back-up MM1025 Current consumption Input/output voltage difference IL=40mA Output current MM1174 Current consumption Input/output voltage difference IL=40mA Output current 2. Normal operation MM1025 Input/output voltage difference IL=80mA (built-in transistor) Output current VCC=6V External transistor drive current VCC= 6V Current consumption MM1174 (for external transistor) Input/output voltage difference IL=200mA Output current External transistor drive current (no built-in TR) VCC=3.6V Current consumption 600µA typ. 0.25V typ. 40mA max. 300µA typ. 0.13V typ. 40mA max. 0.29V typ. 80mA typ. 15mA typ. 900µA max. 0.13V typ. Depends on external transistor 10mA typ. 500µA max. 3. Switching voltage from VCC to Battery VCC=High Low MM1025 4.9V typ. MM1174 3.25V typ. 4. VCC-Battery forced switching and detection voltage adjustment possible Package SOP-8A Applications 1. Memory cards (D-RAM cards, other) 2. PCs, word processors and other equipment with D-RAMs 3. Fax machines, photocopiers and other office equipment with D-RAMs System Reset (with battery back-up) MM1025, 1174 MITSUMI Pin Assignment 1 8 1 7 2 6 3 5 4 SOP-8P (A) 2 GND 3 GND 4 CS 5 VBATT 6 VOUT 7 VCC 8 TRB Pin Description Pin No. 1 2 3 4 5 6 7 8 Pin name Function Forced switching and detection voltage adjustment GND GND CS VBATT VOUT VCC TRB External transistor drive Block Diagram Absolute Maximum Ratings (Ta=25°C) Item Operating temperature Storage temperature Maximum output current 1 Maximum output current 2 Power supply voltage Power consumption Symbol TOPR TSTG IL max. IL max. VCC Pd Rating -20~+70 40~+125 80 40 -0.3~+18 300 Units °C °C mA mA V mW System Reset (with battery back-up) MM1025, 1174 MITSUMI Electrical Characteristics Item Symbol Consumption MM1025 current 1 MM1174 I/O voltage MM1025 difference 1 1 * MM1174 Consumption MM1025 current 2 MM1174 I/O voltage MM1025 difference 2 MM1174 Output voltage MM1025 MM1174 Load fluctuation MM1025 rate MM1174 Input fluctuation MM1025 rate MM1174 Output voltage MM1025 emperature coefficient MM1174 Switching voltage (H L) (Ta=25°C) MM1025 MM1174 Hysteresis MM1025 voltage MM1174 Maximum base MM1025 driving current MM1174 CS output MM1025 voltage H MM1174 CS output MM1025 voltage L MM1174 ICC VSAT1 IBATT VSAT2 VOUT REG-L REG-IN TCVO VTH1 VHYS IB max. VCSH VCSL Timing Chart VCC VHYS VCC VTHI VCC VBATT VOUT VOUT VOUT- VCSH CS VCSL Measurement conditions Min. Typ. Max. Units VCC=6V, VBATT=0V, IL=0mA 0.6 0.9 1.20 VCC=3.6V, VBATT=0V, IL=0mA 0.25 0.50 1.00 VCC=5V, VBATT=0V, IL=80mA 0.15 0.29 0.40 0.13 020 VCC=3.0V, VBATT=0V, IL=200mA VCC=0V, VBATT=6V, IL=0mA 400 600 780 VCC=0V, VBATT=3.6V, IL=0mA 150 300 600 VCC=0V, VBATT=5V, IL=40mA 0.15 0.25 0.40 0.13 0.20 VCC=0V, VBATT=3.0V, IL=20mA VCC=6V or VBATT=6V, IL=5mA 4.8 5.0 5.2 VCC=3.6V or VBATT=3.6V, IL=3mA 3.14 3.27 3.40 VCC : IL=0-80mA, VBATT : IL=0-40mA 0.05 VCC=0V, VBATT=3.6V, IL=0~20mA 0.05 VCC or VBATT=5.5~10V, IL=5mA 0.05 VCC or VBATT=3.6V~10V, IL=3mA 0.05 VCC or VBATT=6V, IL=5mA 0.01 VCC or VBATT=3.6V, IL=3mA 0.01 4V, VBATT=6V, IL=40mA 4.8 4.9 5.1 VCC=4V 3V, VBATT=3.6V, IL=3mA 3.1 3.25 3.4 VCC=4V 6V, VBATT=6V, IL=40mA 100 200 400 VCC=3V 4V, VBATT=3.6V, IL=3mA 15 30 60 9.0 15.0 20.0 5.0 10.0 20.0 VCC=6V, VBATT=6V, VOUT-VCS 0.10 0.50 VCC=3.6V, VBATT=3.6V, VOUT-VCS 0.10 0.50 VCC=3.6V, VCC Ampere meter 8PIN 8PIN V µA V V %/mA %/V %/°C VCC=6V VCC=6V, VCC Ampere meter mA VCC=4V, VBATT=6V 0.50 VCC=3.0V, VBATT=3.6V 0.50 V mV mA V V System Reset (with battery back-up) MM1025, 1174 MITSUMI Characteristics (MM1025 series) Output voltage and current consumption for VCC voltage supply VOUT (V) IBATT (mA) 1.000 Output voltage and current consumption for battery voltage supply 5.000 100.0 .5000 /div 10.00 /div VOUT 1000 /div ICC 0000 0000 VOUT (V) IBATT (mA) 5.000 VOUT ICC .0000 10.00 VBATT 1.000/div (V) .0000 .0000 VBATT 1.000/div (V) (RL=120Ω) Output voltage and current consumption for VCC voltage supply VOUT (V) ICC (mA) 2.000 2000 /div VOUT Output voltage and current consumption for battery voltage supply (mA) 100.0 .5000 /div 10.00 /div .0000 10.00 VCC 1.000/div (V) ICC (mA) 5.000 100.0 .5000 /div 10.00 /div .0000 4.0000 5.000 VOUT .5000 /div ICC Power supply switching voltage (V) VOUT (V) ICC 5.000 (RL=∞) VOUT .0000 10.00 (RL=120Ω) ICC .0000 .0000 .5000 /div .0000 6.000 VCC .2000/div (V) (Ta = ambient temperature) .0000 .0000 VBATT 1.000/div (V) .0000 10.00 (RL=∞) System Reset (with battery back-up) MM1025, 1174 MITSUMI Output voltage (V) VCC output current (external power transistor) 5.0 VCC=6.0V VBATT=0V 4.8 4.6 External Tr 2SA1020Y 0 500 VBATT output current Output voltage (V) 1000 IL (mA) 5.0 VCC=0V VBATT=6.0V 4.8 4.6 0 20 40 60 70 IL (mA) Output voltage (V) VCC output current (no external power transistor) (No external power transistor) 5.0 VCC=6.0V VBATT=0V 4.8 4.6 0 50 100 IL (mA) (MM1174 series) Current consumption (µA) Current consumption 1-2 temperatures 500 Current consumption 1 450 400 Current consumption 2 350 Input/output voltage difference 1 temperature (external transistor 2SA1020) Output voltage (V) Characteristics 3.0 2.8 2.6 2.4 2.2 2.0 300 -25 0 25 50 75 50 100 Temperature (°C) 3.0 IL=-20mA 2.87V 2.85V 2.80V 2.8 2.6 -25 0 25 50 75 Temperature (°C) 200 250 IOUT (mA) Output voltage-Temperature Output voltage (V) Output voltage (V) Input/output voltage difference 2 temperature 150 VOUT=3mA 3.3 3.2 3.1 -25 0 25 50 75 Temperature (°C) System Reset (with battery back-up) MM1025, 1174 MITSUMI CS output voltage H-L temperature 20 15 10 5 -25 0 25 50 (mV) 3.3 CS output voltage H 3.2 100 3.1 CS output voltage L -25 75 0 25 50 Temperature (°C) Temperature (°C) Base drive current VCC-ICC, IBATT ICC (mA) 5.000 5.000 20.00 ICC IBUTT (mA) IBUFF (mA) IBATT 2.000/div IBUFF .5000/div .5000/div IBATT ICC .0000 .0000 1.000/div 10.00 VCC-VOUT, VCS VCS (V) 5.0000 5.0000 VOUT VOUT VCS .500/div .5000/div .0000 0.0000 1.000/div VCC (V) .0000 2.750 .0200/div VCC (V) VCC (V) VOUT (V) 75 .0000 10.00 .0000 2.950 CS output voltage L CS output voltage H (V) Base current (mA) Maximum base drive current-Temperature