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MM1026BD

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仕様・特性

System Reset (with battery back-up) MM1026, 1245, 1080, 1134 MITSUMI System Reset (with battery back-up) Monolithic IC MM1026, 1245, 1080 ,1134 Outline ------------------------------------------- ue d These ICs protect S-RAM data in back-up mode (CS signal makes R-SAM CE pin low and C E pin high) when power supply voltage goes below a certain set voltage (detection voltage 3.5V, 4.2V or 4.5V 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 3.3V 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 Pr od uc t st o be di sc on tin MM1026 • Power supply switching circuit (switching between main power supply and battery) • 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) • Reset output MM1245 • Power supply switching circuit • CS control for S-RAM • CS control signal delay, power supply line chattering removal approx. 1s max. • Supply current from main power supply can be increased by external power transistor MM1080 • Power supply switching circuit • CS control for S-RAM • Low current consumption 60µA typ. MM1134 • Power supply switching circuit • CS control for S-RAM • Gate circuit with CS signal 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 , reset output) 4. Detection voltage (CS, C S IO=100µA IO=50µA IO=50mA --------------------------------------------------------- A : 3.5V typ. B : 4.2V typ. C : 4.5V typ. 0.3µA typ. 0.3V typ. 0.1µA max. 0.2V typ. 4.8V typ. 3.3V typ.

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