LV8571AN

Real Time Clock Overview

The LV8571AN is a volatile Real Time Clock (RTC) integrated circuit manufactured by National Semiconductor. It provides clock/calendar functionality with a 44-byte RAM capacity and supports two timer functions. The device operates within a voltage range of 3V to 3.6V, consuming a maximum current of 220µA during timekeeping. It features alarm capabilities, daylight savings adjustment, leap year compensation, and supports both 12-hour and 24-hour time formats. The component is housed in a 24-pin DIP package with a width of 0.300 inches (7.62mm).

Real Time Clock Feature Summary

• Integrated real-time clock and calendar functionality with dual timer support.
• Includes hardware alarms, daylight savings time adjustment, and leap year compensation.
• Provides 44 bytes of static RAM for data storage.
• Supports configurable 12-hour or 24-hour time display formats.

Real Time Clock Applications

• Data logging systems requiring precise timestamping.
• Industrial control equipment needing scheduled operations.
• Consumer electronics with calendar-based features.
• Communication devices requiring synchronization.

Real Time Clock Procurement Notes

Verify the manufacturer designation as National Semiconductor, noting its acquisition by Texas Instruments. Confirm the specific suffix 'AN' corresponds to the 24-DIP plastic package variant. Ensure compatibility with the required 3V to 3.6V supply voltage range for your application design. Check for availability of the original National Semiconductor part number versus Texas Instruments equivalents if sourcing from modern distributors.

Real Time Clock Selection Notes

Select this component when a dedicated RTC with integrated RAM and timer functions is required. Consider the volatile nature of the memory, which necessitates a backup power source to retain data during main power loss. Evaluate the 220µA current consumption against battery life requirements. Verify that the 24-DIP package fits the PCB layout constraints compared to surface-mount alternatives.

Real Time Clock Part Context

The LV8571AN belongs to the family of Timer Clock Peripherals (TCP) developed by National Semiconductor. It is functionally related to the DP8571 series, offering similar timing and calendar capabilities. As a legacy component from National Semiconductor, it represents an earlier generation of RTC ICs before widespread adoption of low-power CMOS technologies. Texas Instruments now holds the rights to these product lines following their acquisition of National Semiconductor.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult Texas Instruments official resources for direct replacements or cross-reference guides for compatible RTC ICs with similar pinouts and functionalities.