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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR PAR 24SSOP
- Series：-
- Package：Tube
- Mfr：Benchmarq
- 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：2.7V ~ 3.6V
- Voltage - Supply, Battery：2.4V ~ 4V
- Current - Timekeeping (Max)：-
- Operating Temperature：-
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Package / Case：24-SSOP (0.154", 3.90mm Width)
- Supplier Device Package：24-SSOP
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Overview
The BQ3285LSS is a parallel interface Real-Time Clock (RTC) and calendar integrated circuit manufactured by Benchmarq. It operates within a supply voltage range of 2.7V to 3.6V, with battery backup support from 2.4V to 4V. The device provides timekeeping in HH:MM:SS format (12/24 hour) and date tracking in YY-MM-DD-dd format. It includes 242 bytes of non-volatile static RAM (NVSRAM) for general-purpose storage. Key features include alarm functionality, daylight savings time adjustment, leap year compensation, and a programmable square wave output. The component is housed in a 24-SSOP surface-mount package.
Feature Summary
- Integrated RTC with 242-byte NVSRAM
- Parallel bus interface
- Automatic leap year and daylight savings adjustments
- Programmable alarm and square wave output
Applications
- Embedded systems requiring precise timekeeping
- Data logging devices needing non-volatile storage
- Industrial control units with power interruption scenarios
Procurement Notes
Verify the manufacturer designation as Benchmarq Microelectronics Inc against Texas Instruments datasheets, as the BQ3285 series is commonly associated with TI. Confirm the specific suffix 'LSS' corresponds to the 24-SSOP package and voltage parameters listed. Check for RoHS compliance status if required for the application environment.
Selection Notes
Select this component when a parallel interface RTC with significant onboard non-volatile memory is required. Ensure the system design supports the 2.7V–3.6V operating voltage range. Verify that the 24-SSOP package dimensions fit the PCB layout constraints. Consider the availability of the 32.768kHz external crystal oscillator required for clock operation.
Part Context
The BQ3285 series represents a family of real-time clocks compatible with IBM AT architecture standards. While often distributed under Texas Instruments branding, Benchmarq Microelectronics Inc is also listed as a manufacturer for specific variants like the BQ3285LDSS. This part shares functional similarities with other RTCs in the BQ328x lineage but is distinguished by its specific packaging and voltage specifications.
Replacement Considerations
The BQ3285ESS is a functionally similar RTC in a 24-SSOP package. Verify pin compatibility and voltage ranges before substitution. Other BQ3285 variants may differ in package type or manufacturer origin.
