Unit – 3 Session - 12 Data Processing Circuits - VTU e-Learning ...

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10CS 33 LOGIC DESIGN UNIT – 3 Data Processing Circuits The stored data is erased by exposing the die to ultraviolet (UV) light. The UV light passes through the quartz window in the IC package and releases all stored charges. The effect is to erase the stored contents. EPROM ICs Some important EPROM IC types are listed below: 2716 16 K bits organized as 2048 x 8 (2 KB) 2732 32 K bits organized as 4096 x 8 (4 KB) 27256 256 K bits organized as 32768 x 8 (32 KB) Importance of EPROM The EPROM is useful in project development. The designer can modify the contents until the stored data is perfect. When the design is finalized, the data can be burned into PROM. Programmable Array Logic Programmable Array Logic (PAL) is a programmable array of logic gates on a single chip. PAL is different from a PROM. It has a programmable AND array and a fixed OR array. The structure of PAL is as shown below: Programming a PAL With a PROM programmer, we can burn in the desired fundamental products, which are then ORed by the fixed output connections. B. S. Umashankar, BNMIT Page 4
10CS 33 LOGIC DESIGN UNIT – 3 Data Processing Circuits Example: Realize a full adder using PAL. Solution: The output expressions of a full adder are: S = Σ m(1, 2, 4, 7) Co = Σ m(3, 5, 6, 7) Full adder is realized using PAL as shown below: PAL ICs Some important PAL IC types are listed below: 10H8 16H2 14L4 10 input and 8 output AND-OR 6 input and 2 output AND-OR 14 input and 4 output AND-OR-INVERT B. S. Umashankar, BNMIT Page 5
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Unit – 3 Session - 12 Data Processing Circuits - VTU e-Learning ...

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