DS1553P-100+

Real Time Clock Overview

The DS1553P-100+ is a Year-2000-compliant real-time clock/calendar integrated with 64kB nonvolatile static RAM. It operates at a nominal 5.0V supply within a commercial temperature range of 0°C to +70°C. The device utilizes a 34-pin PowerCap package, which requires the separate DS9034PCX module for crystal and lithium battery integration. Key electrical parameters include an active supply current of up to 50mA and CMOS standby current of up to 3mA. Data retention is guaranteed for over 10 years in the absence of power.

Real Time Clock Feature Summary

• Integrated RTC with automatic leap year compensation valid through 2100
• 64kB (8k x 8) Nonvolatile Static RAM resident in top memory locations
• Programmable watchdog timer and alarm with interrupt output
• Precision power-on reset and battery voltage level indicator

Real Time Clock Applications

• Systems requiring precise timekeeping and data retention during power loss
• Industrial control units needing watchdog timer functionality
• Embedded devices utilizing byte-wide interface for register access

Real Time Clock Procurement Notes

Verify that the DS9034PCX PowerCap module is ordered separately, as it is not included with the DS1553P-100+. Confirm the specific revision status via manufacturer documentation, as errata may exist for certain production batches. Ensure the application design accommodates the surface-mount process before attaching the PowerCap module to prevent thermal damage to the internal battery.

Real Time Clock Selection Notes

Select the DS1553P-100+ when a 5.0V supply and 34-pin PowerCap form factor are required. This model provides 85ns access speed compared to the 100ns variant. For 3.3V applications or 28-pin DIP packages, consider alternative models such as the DS1553W-120+ or DS1553-85+. Verify that the system layout allows for the post-solder mounting of the external PowerCap module.

Real Time Clock Part Context

This component belongs to the DS1553 family of timekeeping RAMs manufactured by Analog Devices Inc./Maxim Integrated. The 'P' suffix indicates the 34-pin PowerCap module base, while the '-100+' denotes the 5.0V operating voltage, 100ns maximum access time specification, and lead-free/RoHS compliance. The device integrates the silicon die, allowing for a compact solution when paired with the external energy source module.

Real Time Clock Replacement Considerations

Direct substitutes within the same family include the DS1553P-85+ (85ns access), DS1553WP-120+ (3.3V/85ns), and DS1553WP-150+ (3.3V/150ns). Note that these alternatives require the same DS9034PCX PowerCap module. Cross-family replacements like the DS1554 series differ significantly in function and pinout.