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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR PAR 28SOIC
- Series：-
- Package：Tape & Reel (TR),Cut Tape (CT),Bulk
- Mfr：Texas Instruments
- 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
- Package / Case：28-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：28-SOIC
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Overview
The BQ4802YDWR is a parallel interface Real-Time Clock (RTC) integrated circuit manufactured by Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V, with battery backup support between 2.4V and 4V. The device features a 28-SOIC package and supports HH:MM:SS time formats in both 12-hour and 24-hour modes, alongside YY-MM-DD-dd date formatting. Typical current consumption is 1.5mA at the main supply voltage. Key functional attributes include alarm capabilities, daylight saving time adjustments, leap year compensation, and watchdog timer monitoring.
Feature Summary
- Parallel RTC interface with 16-byte storage capacity
- Supports 12/24 hour time format and YY-MM-DD-dd date format
- Integrated features for alarms, daylight saving time, and leap year correction
- Watchdog timer and monitor functions included
Applications
- Systems requiring precise clock/calendar tracking via parallel bus
- Industrial equipment needing watchdog timer protection
- Devices utilizing NV SRAM control capabilities
Procurement Notes
Verify component authenticity through authorized channels as the part status is listed as Last Time Buy or End-of-Life depending on the specific variant context. Confirm package integrity for the 28-SOIC form factor. Check RoHS3 compliance status if environmental regulations apply to the final assembly. Ensure supply chain stability due to potential discontinuation notices associated with the BQ4802 family.
Selection Notes
Select this component when a parallel interface RTC is required for systems operating at 5V logic levels. The BQ4802YDWR is suitable for applications necessitating hardware-based calendar calculations including leap years and daylight saving time adjustments without continuous CPU intervention. Verify that the system design accommodates the 28-SOIC footprint and parallel data bus requirements.
Part Context
The BQ4802YDWR belongs to the BQ4802Y series of real-time clocks from Texas Instruments. It shares core functionalities with variants such as the BQ4802YPW, differing primarily in packaging (SOIC vs TSSOP). The 'DWR' suffix indicates the specific tape-and-reel packaging configuration for the SOIC-28 package.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Consider evaluating other members of the BQ4802 family, such as BQ4802YPW, noting differences in package type (TSSOP-28 vs SOIC-28) and ensuring pin compatibility before substitution.
