X40421

New Features Monitor Voltages: 5V to 1.6V Memory Security Battery Switch Backup VOUT 5mA to 50mA Preliminary Datasheet 4kbit EEPROM X40420/X40421 APPLICATIONS Communications Equipment —Routers, Hubs, Switches —Disk arrays Industrial Systems —Process Control —Intelligent Instrumentation Computer Systems —Desktop Computers —Network Servers X40420/21 Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch FEATURES Dual voltage detection and reset assertion —Three standard reset threshold settings (4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V) —VTRIP2 Programmable down to 0.9V —Adjust low voltage reset threshold voltages using special programming sequence —Reset signal valid to VCC = 1V —Monitor two voltages or detect power fail Battery Switch Backup VOUT: 5mA to 50mA from VCC; or 250µA from VBATT Fault detection register Selectable power on reset timeout (0.05s, 0.2s, 0.4s, 0.8s) Selectable watchdog timer interval (25ms, 200ms, 1.4s, off) Debounced manual reset input Low power CMOS —25µA typical standby current, watchdog on —6µA typical standby current, watchdog off —1µA typical battery current in backup mode www.DataSheet4U.com 4Kbits of EEPROM —16 byte page write mode —Self-timed write cycle —5ms write cycle time (typical) Built-in inadvertent write protection —Power-up/power-down protection circuitry —Block lock protect 0 or 1/2, of EEPROM 400kHz 2-wire interface 2.7V to 5.5V power supply operation Available packages —14-le...