SRAM Adapter, SOJ to JDEC
The ADAP32 is an SRAM adapter (SOJ to DIP adapter) which allows 32 and 36-pin
SOJ SRAM devices to be used in 28 and 32-pin through-hole DIP (JDEC) sockets.
Note that this adapter is not a straight one-to-one pin-out
format. It is instead designed to accept SRAM parts with center power and
ground (center pwr and gnd), sometimes called "revolutionary SRAM", and
translate into JDEC format.
As SRAM device packaging has evolved, driven partly by the PC industry,
larger SRAM sizes (e.g. 512k x 8) and faster devices (15 nsec access time
or less) are only available in SOJ, TSOP-xx, and TQFP, and not in DIP
format. This creates a problem for board designs which have DIP sites for
For board designs which originally specified expansion SRAM as DIP or use
DIP sites to accomodate a mix of SRAM and EPROM devices, the ADAP32 solves
the problem. The ADAP32 also can be used to upgrade existing board
designs and installed board products or systems to use larger and/or
faster SRAM devices.
ADAP32 Feature Summary
The ADAP32 can be ordered either with or without SRAM devices
installed. Price depends on SRAM type. Quantity discounts are available.
- designed based on high-speed access (7 to 15 nsec) criteria
- standard JDEC 28 and 32 pinout (128k x 8 and 512k x 8 device sizes)
- available in 600 mil and 300 mil widths
- 4-layer PCB includes power and ground layers for high-speed
signal integrity, and decoupling capacitor