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M620
M62021L/P/FP System Reset IC with Switch for Memory Backup REJ03D0784-0200 Rev.2.00 Jun 15, 2007 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. The M62021 contains, in a single chip, power supply monitor and RAM backup functions needed for a microcomputer system, so that the IC makes it possible to construct a system easily and with fewer components compared with a conventional case that uses individual ICs and discrete components. 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. Block Diagram SW 1 VOUT VIN 3 R1 – R2 + D1 Com Reset circuit 2 VBAT 1.24V 8 CS RES 7 Delay circuit RES 5 6 GND REJ03D0784-0200 Rev.2.00 Jun 15, 2007 Page 1 of 13 4 Ct
TOKIN
NECトーキン株式会社
日本
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