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SN74LS85 数据表(PDF) 4 Page - ON Semiconductor

部件名 SN74LS85
功能描述  LOW POWER SCHOTTKY
Download  8 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

SN74LS85 数据表(HTML) 4 Page - ON Semiconductor

  SN74LS85 Datasheet HTML 1Page - ON Semiconductor SN74LS85 Datasheet HTML 2Page - ON Semiconductor SN74LS85 Datasheet HTML 3Page - ON Semiconductor SN74LS85 Datasheet HTML 4Page - ON Semiconductor SN74LS85 Datasheet HTML 5Page - ON Semiconductor SN74LS85 Datasheet HTML 6Page - ON Semiconductor SN74LS85 Datasheet HTML 7Page - ON Semiconductor SN74LS85 Datasheet HTML 8Page - ON Semiconductor  
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NOTE:
The SN74LS85 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 SN74LS85 as shown in Figure 2 in posi-
tions #1, 2, 3, and 4.
SN74LS85
http://onsemi.com
4
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
SN74LS85
SN74LS85
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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