SN74LS85N [ONSEMI]
LOW POWER SCHOTTKY; 小功率肖特基
| 型号： | SN74LS85N |
| 厂家： | 
ONSEMI |
| 描述： | LOW POWER SCHOTTKY |
| 文件： | 总8页 (文件大小：137K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
The SN74LS85 is a 4-Bit Magnitude Camparator which compares
two 4-bit words (A, B), each word having four Parallel Inputs
(A –A , B –B ); A , B being the most significant inputs. Operation
is not restricted to binary codes, the device will work with any
monotonic code. Three Outputs are provided: “A greater than B”
0
3
0
3
3
3
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(O
), “A less than B” (O
), “A equal to B” (O
, allow cascading without external
). Three
LOW
POWER
SCHOTTKY
A>B
A<B
A=B
Expander Inputs, I
gates. For proper compare operation, the Expander Inputs to the least
significant position must be connected as follows: I
, I
, I
A>B A<B A=B
= I
= L,
A<B
A>B
I
= H. For serial (ripple) expansion, the O
, O
, I
and O
, and I
A=B
A>B
A<B
A=B
A=B
Outputs are connected respectively to the I
A>B A<B
Inputs of the next most significant comparator, as shown in Figure 1.
Refer to Applications section of data sheet for high speed method of
comparing large words.
The Truth Table on the following page describes the operation of the
SN74LS85 under all possible logic conditions. The upper 11 lines
describe the normal operation under all conditions that will occur in a
single device or in a series expansion scheme. The lower five lines
describe the operation under abnormal conditions on the cascading
inputs. These conditions occur when the parallel expansion technique
is used.
16
1
PLASTIC
N SUFFIX
CASE 648
• Easily Expandable
• Binary or BCD Comparison
• O
, O
, and O
Outputs Available
A>B
A<B
A=B
16
1
GUARANTEED OPERATING RANGES
Symbol
Parameter
Supply Voltage
Min
4.75
0
Typ
5.0
25
Max
5.25
70
Unit
V
SOIC
D SUFFIX
CASE 751B
V
CC
T
A
Operating Ambient
Temperature Range
°C
I
Output Current – High
Output Current – Low
–0.4
8.0
mA
mA
OH
I
OL
ORDERING INFORMATION
Device
Package
16 Pin DIP
16 Pin
Shipping
SN74LS85N
SN74LS85D
2000 Units/Box
2500/Tape & Reel
Semiconductor Components Industries, LLC, 1999
1
Publication Order Number:
December, 1999 – Rev. 6
SN74LS85/D
SN74LS85
CONNECTION DIAGRAM DIP (TOP VIEW)
V
CC
B
2
A
2
A
1
B
1
A
0
B
0
A
3
16
15
14
13
12
11
10
9
NOTE:
The Flatpak version has the same
pinouts (Connection Diagram) as
the Dual In-Line Package.
1
2
3
4
5
6
8
7
O
O
A=B
I
I
I
O
A>B
GND
B
3
A<B
A<B
A=B
A>B
LOADING (Note a)
HIGH
LOW
PIN NAMES
A – A , B – B
3
Parallel Inputs
A = B Expander Inputs
1.5 U.L.
1.5 U.L.
0.75 U.L.
0.75 U.L.
0.25 U.L.
5 U.L.
5 U.L.
5 U.L.
0
3
0
I
A = B
I
, I
A < B, A > B, Expander Inputs 0.5 U.L.
A < B A > B
O
A > B
A Greater than B Output
B Greater than A Output
A Equal to B Output
10 U.L.
10 U.L.
10 U.L.
O
A < B
O = B
A
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW.
LOGIC SYMBOL
10 12 13 15 9 11 14 1
A
A>B
A A A B B B B
1 2 3 0 1 2 3
0
4
2
3
I
I
I
O
5
7
6
A>B
O
A<B
A<B
O
A=B
A=B
V
CC
= PIN 16
GND = PIN 8
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2
SN74LS85
LOGIC DIAGRAM
(15)
(1)
A3
B3
(5)
(6)
O
O
A>B
A=B
(13)
(14)
(2)
(3)
(4)
A2
B2
A<B
A=B
A>B
(12)
(11)
A1
B1
(7)
O
A<B
(10)
(9)
A0
B0
TRUTH TABLE
CASCADING
INPUTS
COMPARING INPUTS
OUTPUTS
A ,B
A ,B
A ,B
A ,B
I
I
I
O
O
O
A=B
3
3
2
2
1
1
0
0
A>B
A<B
A=B
A>B
A<B
A >B
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
L
X
X
X
X
X
X
X
X
L
H
X
H
L
X
X
X
X
X
X
X
X
L
H
L
H
L
H
L
H
L
H
L
L
L
H
L
H
L
H
L
H
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
3
3
3
3
3
3
3
3
3
3
3
3
3
3
A <B
3
A =B
A >B
3
2
2
2
2
2
2
2
2
2
2
2
2
A =B
A <B
3
2
A =B
A =B
A >B
3
2
1
1
A =B
A =B
A <B
3
2
1
1
A =B
A =B
A =B1
A >B
3
2
1
0
0
0
0
0
0
0
0
A =B
A =B
A =B
A <B
3
2
1
1
1
1
1
1
1
0
A =B
A =B
A =B
A =B
3
2
1
0
A =B
A =B
A =B
A =B
L
H
L
H
L
L
3
2
1
0
A =B
A =B
A =B
A =B
X
H
L
3
2
1
0
H = HIGH Level
L = LOW Level
X = IMMATERIAL
A =B
A =B
A =B
A =B
3
2
1
0
A =B
3
A =B
2
A =B
1
A =B
0
L
H
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3
SN74LS85
A
0
A
1
A
2
A
3
B
0
B
1
B
2
B
3
A
0
A
1
A
2
A
3
B
0
B
1
B
2
B
3
A
0
A
1
A
2
A
3
B
0
B
1
B
2
B
3
I
O
I
O
A > B
A > B
L
L
H
A > B
A > B
A < B
A = B
A > B
O
A < B
I
I
O
A < B
A < B
A < B
SN74LS85
SN74LS85
O
A = B
I
O
A = B
I
A = B
A = B
L = LOW LEVEL
H = HIGH LEVEL
Figure 1. Comparing Two n-Bit Words
APPLICATIONS
Figure 2 shows a high speed method of comparing two
24-bit words with only two levels of device delay. With the
techniqueshowninFigure1, sixlevelsofdevicedelayresult
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
5–24 Bits
25–120 Bits
1
2–6
8–31
NOTE:
The SN74LS85 can be used as a 5-bit comparator only
when the outputs are used to drive the A –A and B –B
0
3
0
3
inputs of another SN74LS85 as shown in Figure 2 in posi-
tions #1, 2, 3, and 4.
INPUTS
(LSB)
(MSB)
A
A
A
A
B
B
B
B
A
0
A
1
A
2
A
3
B
0
B
B B
20 21 22 23 20 21 22 23
1 2 3
A
0
A
1
A
2
A
3
B
0
B
1
B
2
B
3
A
0
A
1
A
A B B B B
2 3 0 1 2 3
L
L
I
I
O
A > B
O
A > B
A > B
A
A > B
19
I
#5
O
A < B
I
#1
O
A < B
B
19
A < B
A < B
L
H
I
I
O
A = B
O
A = B
NC
A = B
A = B
INPUTS
A
5
A
6
A
7
A
8
B
5
B
6
B
7
B
8
A
A
A
A
B
B
B
B
A A A A B B B B
15 16 17 18 15 16 17 18
10 11 12 13 10 11 12 13
A
0
A
1
A
2
A
3
B
0
B
1
B
2
B
3
A
0
A
1
A
2
A
3
B
0
B
1
B
2
B
3
A
0
A
1
A
A B B B
B
3
2 3 0 1 2
O
A > B
A
9
O
A > B
O
A > B
A
4
I
I
A
14
I
A > B
A > B
A > B
#4
#3
#2
B
4
I
O
A < B
B
9
I
O
A < B
I
O
A < B
B
14
A < B
A < B
A < B
I
O
A = B
I
O
A = B
I
O
A = B
L
L
L
A = B
NC
A = B
A = B
NC
NC
A
0
A
1
A
A B B B B
2 3 0 1 2 3
I
O
A > B
A > B
I
O
A < B
#6
A < B
OUTPUTS
I
O
A = B
A = B
MSB = MOST SIGNIFICANT BIT
LSB = LEAST SIGNIFICANT BIT
L = LOW LEVEL
H = HIGH LEVEL
NC = NO CONNECTION
Figure 2. Comparison of Two 24-Bit Words
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4
SN74LS85
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Min
Typ
Max
Guaranteed Input HIGH Voltage for
All Inputs
V
IH
2.0
V
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.5
–1.5
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
2.7
= MIN, I = MAX, V = V
OH IN IH
CC
OH
or V per Truth Table
IL
0.4
0.5
V
V
= V MIN,
CC
0.25
0.35
V
V
I
= 4.0 mA
= 8.0 mA
CC
OL
OL
= V or V
IH
V
OL
Output LOW Voltage
IN
IL
I
per Truth Table
Input HIGH Current
A < B, A > B
Other Inputs
20
60
µA
mA
mA
V
CC
V
CC
V
CC
= MAX, V = 2.7 V
IN
I
I
IH
A < B, A > B
Other Inputs
0.1
0.3
= MAX, V = 7.0 V
IN
Input LOW Current
A < B, A > B
Other Inputs
–0.4
–1.2
= MAX, V = 0.4 V
IL
IN
I
I
Output Short Circuit Current (Note 1)
Power Supply Current
–20
–100
20
mA
mA
V
V
= MAX
= MAX
OS
CC
CC
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T = 25°C, V = 5.0 V)
A
CC
Limits
Typ
Symbol
Parameter
Unit
Test Conditions
Min
Max
t
t
Any A or B to A < B, A > B
Any A or B to A = B
A < B or A = B to A > B
A = B to A = B
24
20
36
30
ns
PLH
PHL
t
t
27
23
45
45
ns
ns
ns
ns
PLH
PHL
t
t
14
11
22
17
V
CC
= 5.0 V
PLH
PHL
C = 15 pF
L
t
t
13
13
20
26
PLH
PHL
t
t
A > B or A = B to A < B
14
11
22
17
PLH
PHL
AC WAVEFORMS
1.3 V
1.3 V
1.3 V
1.3 V
V
IN
V
IN
t
t
t
t
PLH
PHL
PHL
PLH
V
OUT
1.3 V
1.3 V
1.3 V
1.3 V
V
OUT
Figure 3.
Figure 4.
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5
SN74LS85
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
NOTES:
–A–
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
16
1
9
8
B
S
INCHES
DIM MIN MAX
0.740 0.770 18.80 19.55
MILLIMETERS
MIN MAX
F
A
B
C
D
F
C
L
0.250 0.270
0.145 0.175
0.015 0.021
6.35
3.69
0.39
1.02
6.85
4.44
0.53
1.77
0.040
0.70
SEATING
–T–
G
H
J
K
L
M
S
0.100 BSC
0.050 BSC
0.008 0.015
2.54 BSC
1.27 BSC
PLANE
K
M
0.21
0.38
3.30
7.74
10
H
J
0.110
0.295 0.305
10
0.020 0.040
0.130
2.80
7.50
0
G
D 16 PL
0
0.51
1.01
M
M
0.25 (0.010)
T A
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6
SN74LS85
PACKAGE DIMENSIONS
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
–A–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
16
1
9
8
–B–
P 8 PL
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
M
S
0.25 (0.010)
B
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
G
MILLIMETERS
DIM MIN MAX
INCHES
MIN
MAX
0.393
0.157
0.068
0.019
0.049
F
A
B
C
D
F
9.80
3.80
1.35
0.35
0.40
10.00 0.386
4.00 0.150
1.75 0.054
0.49 0.014
1.25 0.016
R X 45
K
C
G
J
K
M
P
1.27 BSC
0.050 BSC
–T–
SEATING
PLANE
0.19
0.10
0
0.25 0.008
0.25 0.004
0.009
0.009
7
J
M
D
16 PL
7
0
5.80
0.25
6.20 0.229
0.50 0.010
0.244
0.019
M
S
S
0.25 (0.010)
T B
A
R
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7
SN74LS85
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withoutfurthernoticetoanyproductsherein. SCILLCmakesnowarranty,representationorguaranteeregardingthesuitabilityofitsproductsforanyparticular
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including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
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For additional information, please contact your local
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SN74LS85/D
相关型号：
SN74LS85NP3
Magnitude Comparator, LS Series, 4-Bit, True Output, TTL, PDIP16, PLASTIC, DIP-16
ROCHESTER
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