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Product Detailed Parameters
- Description：RTC, NON-VOLATILE, 1 TIMER(S)
- Series：-
- Package：Bulk
- Mfr：Texas Instruments
- Type：Clock/Calendar
- Features：Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
- Memory Size：242B
- 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：2.5V ~ 4V
- Current - Timekeeping (Max)：300µA @ 5V
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Surface Mount
- Package / Case：24-SSOP (0.154", 3.90mm Width)
- Supplier Device Package：24-SSOP
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Overview
The BQ3285ESS-TR1 is a Real-Time Clock (RTC) integrated circuit manufactured by Texas Instruments. It features a parallel interface and includes an onboard Non-Volatile Static RAM (NVSRAM) with a storage capacity of 242 bytes. The device supports clock/calendar functions in HH:MM:SS and YY-MM-DD-dd formats, along with alarm, daylight saving time, leap year, and square wave output capabilities. It operates on a main supply voltage of 4.5V to 5.5V and a backup battery voltage of 2.5V to 4V. The maximum current consumption during timing at 5V is 300µA. The component is housed in a 24-SSOP package and is rated for operation within a temperature range of 0°C to 70°C.
Feature Summary
- Integrated 242-byte NVSRAM for data retention
- Parallel interface for system connectivity
- Supports alarms, daylight saving time, and leap year calculations
- Low power consumption of 300µA @ 5V
Applications
- Systems requiring precise timekeeping with non-volatile data storage
- Industrial equipment needing calendar and alarm functions
- Embedded systems utilizing parallel bus architectures
Procurement Notes
The BQ3285ESS variant is listed as obsolete or end-of-life by the manufacturer. Verification of availability should focus on authorized distributors or secondary market suppliers such as Rochester Electronics. Confirm that the -TR1 suffix denotes tape and reel packaging if required for automated assembly processes.
Selection Notes
Select this component when a parallel interface RTC with significant onboard SRAM is required. Ensure the system design accommodates the 24-pin SSOP footprint and the specific voltage requirements of 4.5V–5.5V for VCC and 2.5V–4V for the backup battery. Verify compatibility with the host microcontroller's parallel bus protocol.
Part Context
The BQ3285ESS-TR1 belongs to the BQ3285 family of real-time clocks from Texas Instruments. This family is designed to provide accurate timekeeping and date calculation while offering substantial non-volatile memory for application-specific data storage. The ESS suffix indicates the 24-SSOP surface-mount package type.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. As the base model is obsolete, alternative solutions may require redesigning the interface or selecting a newer RTC family with different pinouts or interfaces.
