DS1557P-70IND

Real Time Clock Overview

The DS1557P-70IND is a nonvolatile, Y2K-compliant timekeeping RAM device integrating a real-time clock (RTC), 512k x 8 static RAM, crystal oscillator, and lithium energy source. It operates at 5V with an industrial temperature range of -40°C to +85°C. The RTC provides BCD-coded year, month, date, day, hours, minutes, and seconds with automatic leap-year compensation valid through 2100. Data retention exceeds 10 years in the absence of power. The device features programmable watchdog timer and alarm functions, precision power-on reset, and battery voltage-level indicators.

Real Time Clock Feature Summary

• Integrated 512k x 8 NV SRAM with identical access to RTC registers located in the top 16 memory locations
• Y2K-compliant RTC with automatic leap-year compensation and century byte register
• Programmable watchdog timer and RTC alarm with interrupt output capabilities
• Precision power-on reset and power-fail write protection for data security

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and large nonvolatile storage
• Embedded controllers needing backup memory and system reset management
• Equipment requiring Y2K compliance and long-term data retention without external batteries

Real Time Clock Procurement Notes

Verify component authenticity and revision status against official Analog Devices documentation. Confirm that the required PowerCap module (DS9034PCX+ or DS9034I-PCX+) is ordered separately as it is not included with the DS1557P-70IND. Ensure environmental specifications match the industrial grade requirements for the target application.

Real Time Clock Selection Notes

Select the DS1557P-70IND when an industrial temperature range (-40°C to +85°C) is required alongside 512KB of nonvolatile memory. This model differs from the commercial variant by its extended temperature rating. Ensure the design accommodates the 34-pin PowerCap package dimensions and utilizes the separate PowerCap base for proper assembly and thermal performance.

Real Time Clock Part Context

This part belongs to the Maxim Integrated DS1557 family of timekeeping RAMs. It combines RTC functionality with substantial NVSRAM capacity. The 'IND' suffix specifically denotes the industrial temperature grade version, distinguishing it from the standard commercial grade counterpart which operates within a 0°C to +70°C range.

Real Time Clock Replacement Considerations

Direct replacements include the DS1557P-70+ for commercial temperature applications. For industrial temperature requirements, verify compatibility with other Maxim NVSRAM devices offering similar memory density and interface characteristics, ensuring pinout and electrical specifications align.