BQ4802LYPWR ,Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V VccMAXIMUM RATINGS(1)over operating free-air temperature range unless otherwise notedbq4802Ybq4802LYIn ..
BQ4802YDW ,Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 5V VccFEATURES APPLICATIONS Real-Time Clock Counts Seconds Through Telecommunications Base StationsCent ..
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BVS-A-R002-1.0 , Precision Resistors
BVS-A-R002-1.0 , Precision Resistors
BVS-A-R003-5.0 , Precision Resistors
BVS-A-R003-5.0 , Precision Resistors
BVS-M-R0003-1.0 , Precision Resistors
BVS-M-R001-1.0 , Precision Resistors
BQ4802LYDW-BQ4802LYPW-BQ4802LYPWG4-BQ4802LYPWR
Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V Vcc
bq4802Y
bq4802LYSLUS464C – AUGUST 2000 – REVISED JUNE 2002
PARALLEL REAL-TIME CLOCK WITH CPU SUPERVISOR AND
EXTERNAL SRAM NONVOLATILE MEMORY BACKUP
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
DESCRIPTIONThe bq4802Y/bq4802LY real-time clock is a low-power
microprocessor peripheral that integrates a time-of-
day clock, a century-based calendar, and a CPU super-
visor, 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.
32.768 kHz
CRYSTAL
ADDRESS BUS
DATA BUSDATA BUS
LITHIUM
CELLADDRESS BUS
CMOS SRAM
5 kΩ
VCC
TYPICAL APPLICATION
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