DS1557P-70IND+

Real Time Clock Overview

The DS1557P-70IND+ is a nonvolatile, Y2K-compliant real-time clock/calendar with 512KB of static RAM. It integrates a lithium energy source and crystal oscillator within a 34-pin PowerCap module. Operating at 5.0V ±10%, it provides BCD-coded timekeeping up to the year 2100 with automatic leap-year compensation. The device features programmable watchdog timers, RTC alarms, and power-fail write protection. Data retention exceeds 10 years in battery-backed mode. It supports byte-wide parallel access with open-drain interrupt and reset outputs.

Real Time Clock Feature Summary

• Integrated 512KB NV SRAM with direct register access
• Y2K-compliant RTC with century byte and automatic leap-year correction
• Internal lithium battery source for over 10 years of data retention
• Programmable watchdog timer and alarm with IRQ/FT output

Real Time Clock Applications

• Industrial systems requiring precise timekeeping without external components
• Data logging equipment needing long-term nonvolatile storage
• Embedded controllers requiring hardware-based watchdog functionality
• Battery-powered devices requiring low-power backup modes

Real Time Clock Procurement Notes

Verify that the required PowerCap base (DS9034PCX+) is ordered separately, as it is not included with the DS1557P-70IND+. Confirm the industrial temperature range (-40°C to +85°C) matches system requirements. Ensure the 34-pin PowerCap module footprint aligns with PCB layout specifications before procurement.

Real Time Clock Selection Notes

Select this component when integrated RTC and large NV memory are needed in a single package. The -IND suffix indicates industrial temperature grading suitable for harsh environments. Compare against the DS1557WP series if surface-mount assembly is preferred over the through-hole PowerCap module format.

Real Time Clock Part Context

This part belongs to the Maxim Integrated DS1557 family of nonvolatile timekeeping RAMs. It combines RTC functions with substantial user-accessible memory. The PWRCP package utilizes a specific base module for mounting. It serves as a complete timing solution eliminating the need for separate crystals or batteries.

Real Time Clock Replacement Considerations

The DS1557P-70IND+ is functionally similar to the DS1557P-70+, differing only in temperature rating. For surface-mount needs, consider the DS1557WP-120IND+ variant. Verify pin compatibility and voltage levels when substituting other RTC families.