FEATURES

Real-Time Clock Counts Seconds Through

Centuries in BCD Format

– bq4802Y: 5-V Operation

– bq4802LY: 3.3-V Operation

On-Chip Battery-Backup Switchover Circuit

With Nonvolatile Control for External SRAM

Less Than 500 nA of Clock Operation Current

in Backup Mode

Microprocessor Reset With Push-Button

Override

Independent Watchdog Timer With

Programmable Time-Out Period

Power-Fail Interrupt Warning

Programmable Clock Alarm Interrupt Active

in Battery-Backup Mode

Programmable Periodic Interrupt

Battery-Low Warning

28-pin SOIC, TSSOP, and SNAPHAT Package

Options

APPLICATIONS

Telecommunications Base Stations

Servers

Handheld Data Collection Equipment

Medical Equipment

Handheld Instrumentation

Test Equipment

DESCRIPTION

The bq4802Y/bq4802LY real-time clock is a low-power

microprocessor peripheral that integrates a time-ofday

clock, a century-based calendar, and a CPU supervisor,

with package options including a 28-pin SOIC,

TSSOP, or SNAPHAT that requires the bq48SH-28x6

to complete the two-piece module. The bq4802Y/

bq4802LY is ideal for fax machines, copiers, industrial

control systems, point-of-sale terminals, data loggers,

and computers.