DESCRIPTION

The X40020 combines power-on reset control, watch dog timer, supply voltage supervision, and secondary supervision, and manual reset, in one package. This combination lowers system cost, reduces board space requirements, and increases reliability.

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; 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 battery current in backup mode

? 400kHz 2-wire interface

? 2.7V to 5.5V power supply operation

? Available packages

—14-lead SOIC, TSSOP

? Monitor voltages: 5V to 1.6V

? Memory security

? Pb-free plus anneal available (RoHS compliant)

APPLICATIONS

? Communications equipment

—Routers, hubs, switches

—Disk arrays

? Industrial systems

—Process control

—Intelligent instrumentation

? Computer systems

—Desktop computers

—Network servers