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SN74LS85N Datasheet(PDF) 3 Page - Motorola, Inc

Part # SN74LS85N
Description  4-BIT MAGNITUDE COMPARATOR
Download  4 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

SN74LS85N Datasheet(HTML) 3 Page - Motorola, Inc

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NOTE:
The SN54/74LS85 can be used as a 5-bit comparator
only when the outputs are used to drive the A0–A3 and
B0–B3 inputs of another SN54/74LS85 as shown in
Figure 2 in positions #1, 2, 3, and 4.
5-86
FAST AND LS TTL DATA
SN54/74LS85
Figure 1. Comparing Two n-Bit Words
L = LOW LEVEL
H = HIGH LEVEL
A0 A1 A2 A3 B0 B1 B2 B3
A0 A1 A2 A3 B0 B1 B2 B3
A0 A1 A2 A3 B0 B1 B2 B3
L
L
H
IA > B
IA < B
IA = B
OA > B
OA < B
OA = B
IA > B
IA < B
IA = B
OA > B
OA < B
OA = B
A > B
A < B
A = B
SN54/74LS85
SN54/74LS85
APPLICATIONS
Figure 2 shows a high speed method of comparing two 24-bit words with only two levels of device delay. With the technique
shown in Figure 1, six levels of device delay result when comparing two 24-bit words. The parallel technique can be expanded
to any number of bits, see Table 1.
Table 1
WORD LENGTH
NUMBER OF PKGS.
1 – 4 Bits
1
5 – 24 Bits
2 – 6
25 – 120 Bits
8 – 31
MSB = MOST SIGNIFICANT BIT
LSB = LEAST SIGNIFICANT BIT
L = LOW LEVEL
H = HIGH LEVEL
NC = NO CONNECTION
A0 A1 A2 A3 B0 B1 B2 B3
A0 A1 A2 A3 B0 B1 B2 B3
L
L
H
IA > B
IA < B
IA = B
OA > B
OA < B
OA = B
#5
(LSB)
INPUTS
A0 A1 A2 A3 B0 B1 B2 B3
IA > B
IA < B
IA = B
OA > B
OA < B
OA = B
#1
L
NC
A20 A21
B23
B22
B21
B20
A23
A22
A19
B19
(MSB)
A5 A6 A7 A8 B5 B6 B7 B8
A0 A1 A2 A3 B0 B1 B2 B3
IA > B
IA < B
IA = B
OA > B
OA < B
OA = B
#4
NC
L
A4
B4
A0 A1 A2 A3 B0 B1 B2 B3
IA > B
IA < B
IA = B
OA > B
OA < B
OA = B
#3
NC
L
A9
B9
A10 A11
B13
B12
B11
B10
A13
A12
A0 A1 A2 A3 B0 B1 B2 B3
IA > B
IA < B
IA = B
OA > B
OA < B
OA = B
#2
NC
L
A14
B14
A15 A16
B18
B17
B16
B15
A18
A17
OUTPUTS
A0 A1 A2 A3 B0 B1 B2 B3
IA > B
IA < B
IA = B
OA > B
OA < B
OA = B
#6
INPUTS
Figure 2. Comparison of Two 24-Bit Words


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