MM1174

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...