BQ4802LY Series
Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V Vcc
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V Vcc
| Part | Voltage - Supply [Min] | Voltage - Supply [Max] | Interface | Time Format | Mounting Type | Package / Case | Package / Case | Package / Case | Type | Voltage - Supply, Battery [Max] | Voltage - Supply, Battery [Min] | Supplier Device Package | Operating Temperature [Max] | Operating Temperature [Min] | Current - Timekeeping (Max) | Features | Package / Case |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ4802LYDW | 2.7 V | 3.6 V | Parallel | HH:MM:SS (12/24 hr) | Surface Mount | 0.295 " | 28-SOIC | 7.5 mm | Clock/Calendar | 4 V | 2.4 V | 28-SOIC | 70 ░C | 0 °C | 1.5 mA | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | |
Texas Instruments BQ4802LYPW | 2.7 V | 3.6 V | Parallel | HH:MM:SS (12/24 hr) | Surface Mount | 4.4 mm | 28-TSSOP | Clock/Calendar | 4 V | 2.4 V | 28-TSSOP | 70 ░C | 0 °C | 1.5 mA | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | 0.173 in |
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
AI
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.