AN1019 Datasheet, PDF (1/4 Pages) STMicroelectronics – Second source for SNAPHAT

AN1019
Application note
Second source for SNAPHAT^® using a dual footprint
Introduction
By integrating a battery and power switching circuitry in its ZEROPOWER^® memory devices,
STMicroelectronics was the first to develop non-volatile CMOS Static RAM technology. This is
conventional, high-speed, low-power, random access, read/write memory that retains its data even
when the external power is removed. By further integrating a crystal oscillator and a real-time clock in
the package for its TIMEKEEPER^® products, STMicroelectronics provides, in a single chip package,
non-volatile SRAM and timekeeping that continues to run without external power.
STMicroelectronics has subsequently extended the technique to work with surface-mount packaging, in
a product range that is known as the SNAPHAT^® (as shown in Figure 1: "SOIC and SNAPHAT^®
package" ). The standard 28-pin or 44-pin SOIC allows the SNAPHAT (containing the battery and
crystal) to be mounted on top of the SOIC package after completion of the surface mount process,
thereby avoiding these components from being exposed to the high temperatures of the surface-
mounting process.
Figure 1: SOIC and SNAPHAT^® package
AI02493
November 2013
DocID006394 Rev 2
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