DS1553WP-150+

Real Time Clock Overview

The DS1553WP-150+ is a Year-2000-compliant real-time clock/calendar and 64kB nonvolatile SRAM integrated into a single 34-pin PowerCap module. Operating at 3.3V, it provides a byte-wide parallel interface with a maximum access time of 150ns. The device integrates a lithium energy source and crystal, maintaining RTC and RAM data for over 10 years without external power. It features programmable alarms, watchdog timers, and automatic leap year compensation.

Real Time Clock Feature Summary

• Integrated 64kB NVSRAM with RTC registers mapped to the top 16 memory locations
• Year-2000 compliant with automatic leap year correction valid through 2100
• Includes programmable watchdog timer and alarm with interrupt output
• Power-fail write protection ensures data integrity during voltage drops

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing nonvolatile storage
• Embedded systems with battery backup requirements

Real Time Clock Procurement Notes

Verify that the separate DS9034PCX PowerCap module is ordered, as it contains the required crystal and lithium battery. Confirm the specific 150ns speed grade matches system timing constraints. Ensure the 3.3V supply voltage aligns with the device's operating range.

Real Time Clock Selection Notes

Select this part for applications requiring combined timekeeping and persistent data storage in a compact surface-mount package. Compare against the DS1553W-120+ if faster 120ns access is needed. Consider the 28-pin EDIP version if through-hole mounting is preferred.

Real Time Clock Part Context

This component belongs to the DS1553 family of timekeeping RAM devices. The 'WP' suffix indicates the 34-pin PowerCap package format, while '150+' denotes the 3.3V operation with 150ns access time and lead-free compliance.

Real Time Clock Replacement Considerations

Direct substitutes include other DS1553 variants such as DS1553WP-120+ for faster access or DS1553P-100+ for 5V operation. Verify pin compatibility and voltage levels when switching between these options.