DATA SHEETS AND SPECIFICATIONS
The manufacturers of
real-world devices provide data sheets that specify the devices’ logical
and electrical characteristics. The electrical specifications portion of a
minimal data sheet for a simple CMOS device, the 54/74HC00 quadruple NAND gate, is shown in Table.1.
Different manufacturers typically specify additional parameters, and they may
vary in how they specify even the “standard” parameters shown in the table.
They usually also show the
test circuits and waveforms that they use to define various parameters, as shown
in Fig.1, which contains information for some parameters in addition to those
used with the 54/74HC00. As a logic designer, we need this knowledge to create
reliable and robust real-world circuits and systems.
Fig.1:
Test Circuits and Waveforms for HC – series Logic
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