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X40420

Xicor
Part Number X40420
Manufacturer Xicor
Description (X40420 / X40421) Dual Voltage Monitor
Published May 28, 2007
Detailed Description New Features • • • • Monitor Voltages: 5V to 1.6V Memory Security Battery Switch Backup VOUT 5mA to 50mA Preliminary Da...
Datasheet PDF File X40420 PDF File

X40420
X40420

Overview
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-lead SOIC, TSSOP EL IM BLOCK DIAGRAM V2MON PR IN + V2 Monitor Logic VTRIP2 See “Ordering Information” for more details For Custom Settings, call Xicor.
DESCRIPTION The X40420/21 combines power-on reset control, watchdog timer, supply voltage supervision, and secondary supervision, manual reset, and Block Lock™ protect serial EEPROM in one package.
This combination lowers system cost, reduces board space requirements, and increases reliability.
Applying voltage to VCC activates the power on ...


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