October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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270
Digital Systems
GND
V
CC
7485 4-bit
Digital
magnitude
comparator
.
.
.
.
B
3
B
0
A
3
A
0
A < B
A = B
A > B
FIGURE 12.2 Digital comparator IC 7485.
MSI IC 7485 (or its HCMOS version 74HC85) is a 4-bit magnitude comparator. It also
as well incorporates all the requirements shown in Figure 11.5. Its block diagram was de-
scribed in Figure 11.6. Figure 12.2 shows the IC 7485.
12.1.2 Decoder IC
Figure 10.5(a) showed 3-line to 8-line (1 of 8) decoder with three control pins
G
1,
G
2, and
G3. The
G
1, and
G
2 control pins are activated by 0 and the G3 pin is activated by 1. A MSI
chip 74138 has the pin corresponding to the decoder shown in the figure. Figure 12.3(a)
shows an exemplary ...
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