M62021L Datasheet | Mitsubishi Electric

DESCRIPTION The M62021 is a system IC that controls the memory backup function of SRAM and microputer (internal RAM). The IC outputs reset signals(RES/RES) to a microputer at power-down and power failure.It also shifts the power supply to RAM from main to backup,outputs a signal (CS) that invokes standby mode,and alters RAM to backup circuit mode. The M62021 contains,in a single chip,power supply monitor and RAM backup functions needed for a microputer system,so that the IC makes it possible to construct a system easily and with fewer ponents pared with a conventional case that uses individual ICs and discrete ponents. PIN CONFIGURATION (TOP VIEW) 8 7 6 5 4 3 2 1 CS RES GND RES Ct(DELAY CAPACITANCE) VIN VBAT VOUT FEATURES - Built-in switch for selection between main power supply and backup power supply to RAM. - Small difference between input and output voltage (IOUT=80m A,VIN=5V)0.2V typ - Detection voltage (power supply monitor voltage)4.40V±0.2V - Chip select signal output(CS) Two channels of reset outputs(RES/RES) - Power on reset circuit built-in - Delay time variable by an external capacitance connected to Ct pin - Facilitates to form backup function with a few number of ponents VOUT VBAT VIN Ct(DELAY CAPACITANCE) Outline 8P5(L) 1 2 3 4 8 7 6 5 CS RES GND RES Outline 8P4(P) 8P2S-A(FP) APPLICATION Power supply control systems for memory backup of microputer system and SRAM boards with built-in backup function that require switching between external power supply and battery. BLOCK DIAGRAM R1 D1 1 + 1.24V RESET CIRCUIT VOUT VBAT CS 2 8 R2 RES RES 7 5 DELAY CIRCUIT Ct MITSUBISHI ELECTRIC ( 1 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62021L,P,FP SYSTEM RESET IC WITH SWITCH FOR MEMORY...