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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：2.7V ~ 3.6V
- Voltage - Supply, Battery：2.4V ~ 4V
- Current - Timekeeping (Max)：1.5mA (Typ) @ 2.7 V ~ 3.6 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 BQ4802LYDWR is a parallel real-time clock (RTC) integrated circuit manufactured by Texas Instruments. It provides clock and calendar functionality in a 28-SOIC package. The device operates with a main supply voltage of 4.5V to 5.5V and a battery backup voltage of 2.4V to 4V. Typical current consumption is 1.5mA at the main supply voltage. It supports 12/24-hour time formats and YY-MM-DD-dd date formats. Key features include alarm, daylight saving time, leap year, monitor, and watchdog timer functions.
Feature Summary
- Parallel interface for direct connection to microprocessors
- Integrated alarm, daylight saving time, and leap year correction
- Battery backup switching capability with 2.4V-4V support
- Watchdog timer and monitor functions for system reliability
Applications
- Industrial control systems requiring precise timekeeping
- Data logging equipment needing calendar tracking
- Telecommunications infrastructure with parallel bus interfaces
- Embedded systems utilizing 5V logic levels
Procurement Notes
Verify the specific suffix 'LY' against the official Texas Instruments datasheet for the BQ4802 family. Confirm that the 'L' variant meets the required operating temperature range and material specifications compared to the standard 'Y' version. Ensure the 'DWR' suffix corresponds to the tape-and-reel packaging format intended for surface-mount assembly. Cross-reference the RoHS status and moisture sensitivity level with current regulatory requirements before procurement.
Selection Notes
Select this component when a parallel RTC interface is required instead of I2C or SPI. Ensure the host system can accommodate the 28-SOIC footprint and the specific pinout configuration. Verify that the 4.5V-5.5V VCC range aligns with the system power rails. Consider the 1.5mA typical current consumption for battery backup calculations if primary power is lost.
Part Context
The BQ4802LYDWR belongs to the BQ4802 series of parallel RTCs from Texas Instruments. It shares core functionalities with variants like the BQ4802YDW but may differ in specific environmental ratings or material compositions indicated by the 'L' prefix. The 'DWR' designation specifies the 28-SOIC package with tape-and-reel shipping. This part is designed for applications requiring robust timekeeping without serial protocol overhead.
Replacement Considerations
Direct substitutes within the same package and interface include other BQ4802 variants such as BQ4802YDWR. Verify pin compatibility and electrical parameters before substitution. No alternative cross-manufacturer parts are confirmed in the provided data.
