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Product Detailed Parameters
- Description：REAL TIME CLOCK, 1 TIMER(S)
- Series：*
- Package：Bulk
- Mfr：Texas Instruments
- Type：-
- Features：-
- Memory Size：-
- Time Format：-
- Date Format：-
- Interface：-
- Voltage - Supply：-
- Voltage - Supply, Battery：-
- Current - Timekeeping (Max)：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
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Overview
The BQ3285ESS-N is a Real-Time Clock (RTC) integrated circuit manufactured by Texas Instruments, belonging to the BQ3285 family. It provides clock/calendar functionality with a parallel interface and includes 242 bytes of non-volatile static RAM (NVSRAM). The device operates on a main supply voltage of 4.5V to 5.5V and supports a backup battery voltage of 2.5V to 4V. Key electrical specifications include a maximum current consumption of 300µA at 5V. It is housed in a 24-SSOP package with a width of 3.90mm and is rated for an operating temperature range of 0°C to 70°C.
Feature Summary
- Integrated 242-byte NVSRAM for data retention without external memory
- Parallel interface for direct connection to host microprocessors
- Supports alarm functions, daylight saving time adjustments, and leap year compensation
- Includes square wave output capability
Applications
- Industrial control systems requiring precise timekeeping
- Data logging equipment needing non-volatile storage alongside RTC
- Embedded systems with parallel bus architectures
Procurement Notes
The BQ3285ESS-N is identified as a discontinued product by Texas Instruments, with an End-of-Life (EOL) notification dated January 16, 2017. Procurement must rely on authorized distributors or secondary market suppliers such as Rochester Electronics. Verification of component authenticity and lot traceability is critical due to the EOL status. Buyers should confirm the specific suffix 'N' denotes the standard commercial grade variant consistent with the base BQ3285ESS specification.
Selection Notes
Select this component only if the design utilizes a parallel interface and requires integrated NVSRAM, eliminating the need for separate memory chips. Ensure the system power supply aligns with the 4.5V–5.5V VCC and 2.5V–4V VBAT requirements. The 0°C to 70°C operating temperature range limits suitability for harsh industrial environments; consider higher-grade variants if extended temperature ranges are necessary. Verify that the 24-SSOP package footprint matches the PCB layout.
Part Context
The BQ3285ESS-N is part of the BQ3285 series of real-time clock ICs from Texas Instruments. This series is designed to provide accurate timekeeping and calendar functions with additional data storage capabilities. The 'ESS' suffix indicates the 24-SSOP surface-mount package, while 'N' typically signifies the standard commercial temperature grade version within the TI nomenclature.
Replacement Considerations
As the BQ3285ESS-N is discontinued, direct replacements may be limited. Potential alternatives within the TI portfolio include the BQ3287 series, though pinouts and interfaces may differ. Engineers should evaluate cross-references from secondary manufacturers like Nuvoton or Microchip, ensuring compatibility with parallel interfaces and NVSRAM requirements.
