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DESCRIPTION

These devices combine four popular functions, Power-on Reset Control, Watchdog Timer, Supply Voltage Supervision, and Block Lock Protect Serial EEPROM Memory in one package. This combination lowers system cost, reduces board space requirements, and increases reliability.

FEATURES

? Selectable watchdog timer

? Low VCC detection and reset assertion

¡ªFive standard reset threshold voltages

¡ªRe-program low VCC reset threshold voltage using special programming sequence

¡ªReset signal valid to VCC = 1V

? Determine watchdog or low voltage reset with a volatile flag bit

? Long battery life with low power consumption

¡ª<50?A max standby current, watchdog on

¡ª<1?A max standby current, watchdog off

¡ª<400?A max active current during read

? 32Kbits of EEPROM

? Built-in inadvertent write protection

¡ªPower-up/power-down protection circuitry

¡ªProtect 0, 1/4, 1/2 or all of EEPROM array with Block Lock? protection

¡ªIn circuit programmable ROM mode

? 2MHz SPI interface modes (0,0 & 1,1)

? Minimize EEPROM programming time

¡ª32-byte page write mode

¡ªSelf-timed write cycle

¡ª5ms write cycle time (typical)

? 2.7V to 5.5V and 4.5V to 5.5V power supply operation

? Available packages

¡ª14 Ld TSSOP, 8 Ld SOIC, 8 Ld PDIP

? Pb-free plus anneal available (RoHS compliant)