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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR PAR 28SOIC
- Series：-
- Package：Bulk
- Mfr：Benchmarq
- Type：Clock/Calendar
- Features：Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer
- Memory Size：-
- Time Format：HH:MM:SS (12/24 hr)
- Date Format：YY-MM-DD-dd
- Interface：Parallel
- Voltage - Supply：4.5V ~ 5.5V
- Voltage - Supply, Battery：2.4V ~ 4V
- Current - Timekeeping (Max)：1.5mA (Typ) @ 4.5 V ~ 5.5 V
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Package / Case：28-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：28-SOIC
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Overview
The Benchmarq BQ4802YDW is a parallel interface Real-Time Clock (RTC) and calendar integrated circuit housed in a 28-SOIC surface-mount package. It operates on a main supply voltage of 4.5V to 5.5V with a battery backup range of 2.4V to 4V, drawing a typical current of 1.5mA during timekeeping. The device supports HH:MM:SS time formats in both 12-hour and 24-hour modes, alongside YY-MM-DD-dd date formatting. Key functional features include alarm capabilities, daylight savings adjustments, leap year compensation, supervisor monitoring, and watchdog timer functions, ensuring reliable operation within a commercial temperature range of 0°C to 70°C.
Feature Summary
- Parallel interface for clock/calendar data access
- Integrated alarm, daylight savings, and leap year correction
- Supervisor and watchdog timer protection features
- Supports 12/24 hour time and YY-MM-DD-dd date formats
Applications
- Industrial systems requiring precise timekeeping and calendar tracking
- Equipment needing supervisor and watchdog timer integration
- Devices utilizing parallel bus architectures for RTC connectivity
Procurement Notes
Verify the manufacturer designation carefully, as this component is historically associated with Texas Instruments under the same part number. Confirm that the Benchmarq source provides valid datasheets and quality certifications matching the original specifications before procurement. Ensure the 28-SOIC package dimensions align with the target PCB footprint requirements.
Selection Notes
Select this component when a parallel interface is required for high-speed data transfer compared to serial alternatives. Ensure the system design accommodates the 4.5V to 5.5V main supply and 2.4V to 4V battery input ranges. Verify that the 0°C to 70°C operating temperature range meets the environmental constraints of the intended application.
Part Context
This part belongs to the broader category of real-time clock and calendar ICs used for maintaining accurate time in electronic systems. It serves as a specialized timing solution for applications where parallel communication protocols are preferred or mandated by the host microcontroller architecture.
Replacement Considerations
Cross-reference with other parallel RTC ICs from various manufacturers if Benchmarq availability is limited. Ensure any substitute maintains compatibility with the 28-SOIC package and supports the required parallel interface protocol.
