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