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Engineering Digital Design
book

Engineering Digital Design

by Richard F. Tinder
January 2000
Intermediate to advanced content levelIntermediate to advanced
884 pages
29h 39m
English
Academic Press
Content preview from Engineering Digital Design
6.6 MAGNITUDE COMPARATORS 265
FIGURE 6.23
LED configurations for the BCD-to-seven-segment display converter. (a) Common anode. (b) Com-
mon cathode.
enable the decoder if BI(L) =1(L), or disable it if BI(L) =0(L). Notice that the common
cathode configuration of LEDs in Fig. 6.23b requires the inputs to be 1(H) =HV to force
the diode into forward bias (conducting mode). Thus, a 0(L) for any output in Eqs. (6.19)
is a 1(H), which is the same as a 1 in the positive logic truth table of Fig. 6.22b. Coupling
the decoder of Fig. 6.24 with the common anode configuration requires the use of nonin-
verting tri-state drivers with active low controls as in Fig.
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Publisher Resources

ISBN: 9780126912951