DP8570AVX

Overview

The DP8570AVX is a Timer Clock Peripheral (TCP) manufactured by National Semiconductor, now part of Texas Instruments. It functions as a real-time clock and calendar controller designed for microprocessor-based systems. The device provides binary-coded decimal (BCD) timekeeping for seconds, minutes, hours, days, dates, months, and years, including leap year compensation. It features a parallel interface for data transfer and supports battery backup switching to maintain timekeeping during main power failures. The component operates within a voltage range of 4.5 V to 5.5 V and is rated for industrial temperatures from -40°C to +85°C.

Feature Summary

• Integrated Real-Time Clock (RTC) with Calendar functionality supporting BCD format
• Parallel bus interface for direct connection to system data buses
• Hardware battery backup switching circuit for continuous operation
• Leap year compensation valid through the year 2100

Applications

• Personal computers and workstations requiring persistent timekeeping
• Industrial control systems needing accurate date and time stamps
• Embedded microprocessor applications with parallel memory interfaces

Part Context

The DP8570 series belongs to the Timer Clock Peripheral family originally developed by National Semiconductor. The 'A' suffix typically denotes an enhanced version with improved specifications or features compared to earlier iterations. The 'V' indicates a plastic PLCC package variant, while 'X' often signifies a specific tape-and-reel packaging option for automated assembly. This component serves as a foundational timing solution for legacy PC architectures and embedded systems utilizing standard 5V logic levels.

Replacement Considerations

Direct pin-compatible replacements include the DP8570AN (DIP package) and DP8570AV (PLCC package). For modern designs, consider CMOS-based RTCs such as the DS1307 or PCF8563, though these require I2C/SPI interface adaptation rather than parallel bus compatibility.