BQ4802YDM

The BQ4802YDM is a kind of parallel real-time clock with cpu supervisor and external sram nonvolatile memory backup. It is a low-power microprocessor peripheral that integrates a time-of-day clock, a century-based calendar, and a CPU supervisor. It is designed for fax machines, copiers, industrial control systems, point-of-sale terminals, data loggers, and computers.

There are some features of BQ4802YDMas follows: (1) real-time clock counts seconds through; (2) centuries in BCD format: 5-v operation; (3) on-chip battery-backup switchover circuit with nonvolatile control for external sram; (4) less than 500 na of clock operation current in backup mode; (5) microprocessor reset with push-button override; (6) independent watchdog timer with programmable time-out period; (7) power-fail interrupt warning; (8) programmable clock alarm interrupt active in battery-backup mode; (9) programmable periodic interrupt; (10) battery-low warning; (11) 28-pin SOIC package.

What comes next is about the absolute maximum ratings of BQ4802YDM over operating free-air temperature range unless otherwise noted. (1) input voltage range, VCC, VT (VT VCC +0.3): -0.3 V to 6.0 V; (2) operating temperature range, TJ:  0 to 70; (3) storage temperature range, Tstg:  -55 to 125; (4) temperature under bias, TJbias:  -40 to 85; (5) lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: 300