Description

The M62021 is a system IC that controls the memory backup function of microcomputer (internal RAM).

The IC outputs reset signals (RES/RES) to a microcomputer 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.

Features

• Built-in switch for selection between main power supply and backup power supply to RAM.

• Small difference between input and output voltage (IOUT= 80 mA, VIN = 5 V) 0.2 V Typ

• Detection voltage (power supply monitor voltage) 4.40 V ±0.2 V

• 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 components

Application

• Power supply control systems for memory backup of microcomputer system and SRAM boards with built-in backup function that require switching between external power supply and battery.