M62021FP Datasheet | Renesas

Description The M62021 is a system IC that controls the memory backup function of 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. 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 m A, 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 ponents 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 VIN 3 R1 R2 - + 1.24V Reset circuit RES 7 RES 5 Delay circuit 6 GND 1 VOUT D1 2 VBAT 8 CS 4 Ct REJ03D0784-0200 Rev.2.00 Jun 15, 2007 Page 1 of 13 M62021L/P/FP Pin Arrangement M62021L M62021P M62021FP 8 CS VOUT 1 8 CS 7 RES VBAT 2 7 RES 6...