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Replacing SmartWatch with Phantom clock module

Posted: 30 Jan 2014     Print Version  Bookmark and Share

Keywords:SRAM  socket  DS1216  SmartWatch  Phantom clock module 

With the declining availability of plastic dual-in-line package (PDIP) static random access memory (SRAMs), the DS1216 SmartWatch products are rapidly approaching end-of-life. Populating new sockets with low-power memory devices has already become a procurement challenge that can be easily avoided.

Most of the SmartWatch products can be replaced using a pin-compatible, equivalent-density 5V Phantom clock module. This provides the customer with a drop-in, one-piece solution that is guaranteed to at least 10 years of data retention life.

In existing applications, a DS1216 SmartWatch and some version of a customer-procured SRAM provide the nonvolatile memory functionality for data storage in the absence of external power. The SRAM is the load that eventually consumes the internal battery's charge capacity. Without knowing how much current that SRAM is actually consuming, when you arbitrarily move that SRAM to the new socket, the life expectancy of that new socket becomes unknown. The dead battery in the old DS1216 socket was merely a symptom of the problem, but the root cause (SRAM) is now transferred to a new socket to fail again in time.

View the PDF document for more information.

Originally published by Maxim Integrated at as "How to Replace a DS1216 SmartSocket with an Equivalent-Density Phantom Clock Module".

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