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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR PAR 24DIP
- Series：-
- Package：Tube
- Mfr：Benchmarq
- Type：Clock/Calendar
- Features：Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
- Memory Size：114B
- 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：Through Hole
- Grade：-
- Qualification：-
- Package / Case：24-DIP (0.600", 15.24mm)
- Supplier Device Package：24-PDIP
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Overview
The BQ4285EP is a parallel interface real-time clock and calendar integrated circuit manufactured by Benchmarq. It operates within a supply voltage range of 4.5V to 5.5V, with battery backup support between 2.5V and 4V. The device provides timekeeping in HH:MM:SS format (12/24 hour) and date tracking in YY-MM-DD-dd format. It includes 114 bytes of non-volatile SRAM and features an alarm, daylight savings adjustment, leap year correction, and square wave output. Maximum current consumption during timekeeping is 300µA at 5V. The component is housed in a 24-pin DIP package for through-hole mounting.
Feature Summary
- Parallel interface with 114-byte NVSRAM
- Automatic leap year and daylight savings adjustments
- Programmable alarm and square wave output
- Low power consumption: 300µA max at 5V
Applications
- Industrial systems requiring precise timekeeping
- Data logging equipment with non-volatile storage needs
- Embedded controllers needing hardware calendar functions
Procurement Notes
Verify the 24-DIP package dimensions and pinout compatibility before integration. Confirm that the 4.5V–5.5V VCC range aligns with the system power rails. Ensure the external battery voltage falls within the 2.5V–4V specification for reliable switchover. Check lead times as this is a specialized RTC component.
Selection Notes
Select this part when a parallel interface is required instead of serial alternatives like I2C or SPI. It is suitable for applications needing built-in NVSRAM alongside timekeeping. Consider the 300µA current draw if battery life is critical. The 24-DIP package is appropriate for prototyping or through-hole PCB designs.
Part Context
This component belongs to the Benchmarq real-time clock family. It serves as a standalone clock/calendar solution with memory capabilities. It differs from serial RTCs by offering direct parallel data access, which may simplify software drivers in legacy or specific microcontroller architectures.
Replacement Considerations
Direct replacements must match the 24-DIP package, parallel interface, and similar voltage ranges. Verify pin-to-pin compatibility if substituting with other manufacturers' parallel RTCs. Ensure equivalent NVSRAM size and feature sets such as alarm and leap year support.
