Unit – 3 Session - 12 Data Processing Circuits - VTU e-Learning ...
Unit – 3 Session - 12 Data Processing Circuits - VTU e-Learning ...
Unit – 3 Session - 12 Data Processing Circuits - VTU e-Learning ...
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10CS 33 LOGIC DESIGN<br />
UNIT <strong>–</strong> 3 <strong>Data</strong> <strong>Processing</strong> <strong>Circuits</strong><br />
The stored data is erased by exposing the die to ultraviolet (UV) light. The UV light passes through the<br />
quartz window in the IC package and releases all stored charges. The effect is to erase the stored<br />
contents.<br />
EPROM ICs<br />
Some important EPROM IC types are listed below:<br />
2716 16 K bits organized as 2048 x 8 (2 KB)<br />
2732 32 K bits organized as 4096 x 8 (4 KB)<br />
27256 256 K bits organized as 32768 x 8 (32 KB)<br />
Importance of EPROM<br />
The EPROM is useful in project development. The designer can modify the contents until the stored<br />
data is perfect. When the design is finalized, the data can be burned into PROM.<br />
Programmable Array Logic<br />
Programmable Array Logic (PAL) is a programmable array of logic gates on a single chip. PAL is different<br />
from a PROM. It has a programmable AND array and a fixed OR array. The structure of PAL is as shown<br />
below:<br />
Programming a PAL<br />
With a PROM programmer, we can burn in the desired fundamental products, which are then ORed by<br />
the fixed output connections.<br />
B. S. Umashankar, BNMIT Page 4
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