BQ4802LY Series

Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V Vcc

Catalog

Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V Vcc

Part	Operating Temperature [Max]	Time Format	Type	Voltage - Supply, Battery [Max]	Voltage - Supply, Battery [Min]	Supplier Device Package	Mounting Type	Interface	Voltage - Supply [Min]	Voltage - Supply [Max]	Current - Timekeeping (Max)	Features	Package / Case	Package / Case [x]	Package / Case [y]	Package / Case	Package / Case [x]	Package / Case [x]
Texas Instruments BQ4802LYDW	70 °C	HH:MM:SS (12/24 hr)	Clock/Calendar	4 V	2.4 V	28-SOIC	Surface Mount	Parallel	2.7 V	3.6 V	1.5 mA	Alarm Daylight Savings Leap Year Supervisor Watchdog Timer	28-SOIC	0.295 in	7.5 mm
Texas Instruments BQ4802LYPWG4	70 °C	HH:MM:SS (12/24 hr)	Clock/Calendar	4 V	2.4 V	28-TSSOP	Surface Mount	Parallel	2.7 V	3.6 V	1.5 mA	Alarm Daylight Savings Leap Year Supervisor Watchdog Timer	28-TSSOP		4.4 mm	0.173 in
Texas Instruments BQ4802YDW	70 °C	HH:MM:SS (12/24 hr)	Clock/Calendar	4 V	2.4 V	28-SOIC	Surface Mount	Parallel	4.5 V	5.5 V	1.5 mA	Alarm Daylight Savings Leap Year Supervisor Watchdog Timer	28-SOIC	0.295 in	7.5 mm
Texas Instruments BQ4802LYPW	70 °C	HH:MM:SS (12/24 hr)	Clock/Calendar	4 V	2.4 V	28-TSSOP	Surface Mount	Parallel	2.7 V	3.6 V	1.5 mA	Alarm Daylight Savings Leap Year Supervisor Watchdog Timer	28-TSSOP		4.4 mm	0.173 in
Texas Instruments BQ4802YDSH	70 °C	HH:MM:SS (12/24 hr)	Clock/Calendar	4 V	2.4 V	28-SOP	Surface Mount	Parallel	4.5 V	5.5 V	1.5 mA	Alarm Daylight Savings Leap Year Supervisor Watchdog Timer	28-SOIC with SNAPHAT Sockets				8.77 mm	0.345 in
Texas Instruments BQ4802LYDSH	70 °C	HH:MM:SS (12/24 hr)	Clock/Calendar	4 V	2.4 V	28-SOP	Surface Mount	Parallel	2.7 V	3.6 V	1.5 mA	Alarm Daylight Savings Leap Year Supervisor Watchdog Timer	28-SOIC with SNAPHAT Sockets				8.77 mm	0.345 in
Texas Instruments BQ4802YDWR	70 °C	HH:MM:SS (12/24 hr)	Clock/Calendar	4 V	2.4 V	28-SOIC	Surface Mount	Parallel	4.5 V	5.5 V	1.5 mA	Alarm Daylight Savings Leap Year Supervisor Watchdog Timer	28-SOIC	0.295 in	7.5 mm
Texas Instruments BQ4802YDWRG4	70 °C	HH:MM:SS (12/24 hr)	Clock/Calendar	4 V	2.4 V	28-SOIC	Surface Mount	Parallel	4.5 V	5.5 V	1.5 mA	Alarm Daylight Savings Leap Year Supervisor Watchdog Timer	28-SOIC	0.295 in	7.5 mm

Catalog

Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V Vcc

Key Features

• Real-Time Clock Counts Seconds Through Centuries in BCD Formatbq4802Y: 5-V Operationbq4802LY: 3.3-V OperationOn-Chip Battery-Backup Switchover Circuit With Nonvolatile Control for External SRAMLess Than 500 nA of Clock Operation Current in Backup ModeMicroprocessor Reset With Push-Button OverrideIndependent Watchdog Timer With Programmable Time-Out PeriodPower-Fail Interrupt WarningProgrammable Clock Alarm Interrupt Active in Battery-Backup ModeProgrammable Periodic InterruptBattery-Low Warning28-pin SOIC, TSSOP, and SNAPHAT Package OptionsAPPLICATIONSTelecommunications Base StationsServersHandheld Data Collection EquipmentMedical EquipmentHandheld InstrumentationTest EquipmentReal-Time Clock Counts Seconds Through Centuries in BCD Formatbq4802Y: 5-V Operationbq4802LY: 3.3-V OperationOn-Chip Battery-Backup Switchover Circuit With Nonvolatile Control for External SRAMLess Than 500 nA of Clock Operation Current in Backup ModeMicroprocessor Reset With Push-Button OverrideIndependent Watchdog Timer With Programmable Time-Out PeriodPower-Fail Interrupt WarningProgrammable Clock Alarm Interrupt Active in Battery-Backup ModeProgrammable Periodic InterruptBattery-Low Warning28-pin SOIC, TSSOP, and SNAPHAT Package OptionsAPPLICATIONSTelecommunications Base StationsServersHandheld Data Collection EquipmentMedical EquipmentHandheld InstrumentationTest Equipment

Description

The 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 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. The bq4802Y/bq4802LY provides direct connections for a 32.768-kHz quartz crystal and a 3-V backup battery. Through the use of the conditional chip enable output (CE\OUT) and battery voltage output (VOUT) pins, the bq4802Y/bq4802LY can write-protect and make non- volatile external SRAMs. The backup cell powers the real-time clock and maintains SRAM information the absence of system voltage. The crystal and battery are contained within the modules for a more integrated solution. The bq4802Y/bq4802LY contains a temperature-compensated reference and comparator circuit that monitors the status of its voltage supply. When the bq4802Y/bq4802LY detects an out-of-tolerance condition, it generates an interrupt warning and subsequently a microprocessor reset. The reset stays active for 200 ms after VCCrises within tolerance, to allow for power supply and processor stabilization. The reset function also allows for an external push-button override. The 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 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. The bq4802Y/bq4802LY provides direct connections for a 32.768-kHz quartz crystal and a 3-V backup battery. Through the use of the conditional chip enable output (CE\OUT) and battery voltage output (VOUT) pins, the bq4802Y/bq4802LY can write-protect and make non- volatile external SRAMs. The backup cell powers the real-time clock and maintains SRAM information the absence of system voltage. The crystal and battery are contained within the modules for a more integrated solution. The bq4802Y/bq4802LY contains a temperature-compensated reference and comparator circuit that monitors the status of its voltage supply. When the bq4802Y/bq4802LY detects an out-of-tolerance condition, it generates an interrupt warning and subsequently a microprocessor reset. The reset stays active for 200 ms after VCCrises within tolerance, to allow for power supply and processor stabilization. The reset function also allows for an external push-button override.