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Электронный компонент: 74LS645

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Semiconductor Components Industries, LLC, 1999
December, 1999 Rev. 6
1
Publication Order Number:
SN74LS640/D
SN74LS640 SN74LS641
SN74LS642 SN74LS645
Octal Bus Transceivers
These octal bus transceivers are designed for asynchronous
two-way communication between data buses. Control function
implementation minimizes external timing requirements. These
circuits allow data transmission from the A bus to B or from the B bus
to A bus depending upon the logic level of the direction control (DIR)
input. Enable input (G) can disable the device so that the buses are
effectively isolated.
DEVICE
OUTPUT
LOGIC
LS640
3-State
Inverting
LS641
Open-Collector
True
LS642
Open-Collector
Inverting
LS645
3-State
True
FUNCTION TABLE
CONTROL
INPUTS
OPERATION
INPUTS
LS640
LS641
G
DIR
LS640
LS642
LS641
LS645
L
L
B data to A bus
B data to A bus
L
H
A data to B bus
A data to B bus
H
X
Isolation
Isolation
H = HIGH Level, L = LOW Level, X = Irrelevant
GUARANTEED OPERATING RANGES
(SN74LS640, SN74LS645)
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
4.75
5.0
5.25
V
T
A
Operating Ambient
Temperature Range
0
25
70
C
I
OH
Output Current High
3.0
mA
15
mA
I
OL
Output Current Low
24
mA
GUARANTEED OPERATING RANGES
(SN74LS641, SN74LS642)
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
4.75
5.0
5.25
V
T
A
Operating Ambient
Temperature Range
0
25
70
C
V
OH
Output Voltage High
5.5
V
I
OL
Output Current Low
24
mA
LOW
POWER
SCHOTTKY
Device
Package
Shipping
ORDERING INFORMATION
SN74LS640N
16 Pin DIP
1440 Units/Box
SN74LS640DW
16 Pin
SOIC
DW SUFFIX
CASE 751D
http://onsemi.com
2500/Tape & Reel
PLASTIC
N SUFFIX
CASE 738
20
1
20
1
SN74LS641N
16 Pin DIP
1440 Units/Box
SN74LS641DW
16 Pin
2500/Tape & Reel
SN74LS642N
16 Pin DIP
1440 Units/Box
SN74LS642DW
16 Pin
2500/Tape & Reel
SN74LS645N
16 Pin DIP
1440 Units/Box
SN74LS645DW
16 Pin
2500/Tape & Reel
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
2
CONNECTION DIAGRAMS DIP (TOP VIEW)
18
17
16
15
14
13
1
2
3
4
5
6
7
20
19
8
V
CC
DIR
B1
B2
B3
B5
B4
B6
A1
A2
A3
A4
A5
A6
A7
9
10
A8
GND
12
11
B7
B8
18
17
16
15
14
13
1
2
3
4
5
6
7
20
19
8
V
CC
DIR
B1
B2
B3
B5
B4
B6
A1
A2
A3
A4
A5
A6
A7
9
10
A8
GND
12
11
B7
B8
SN74LS640
SN74LS642
SN74LS641
SN74LS645
ENABLE
G
ENABLE
G
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
3
SN74LS640
SN74LS645
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
V
IH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
V
IL
Input LOW Voltage
0.6
V
Guaranteed Input LOW Voltage for
All Inputs
V
IK
Input Clamp Diode Voltage
0.65
1.5
V
V
CC
= MIN, I
IN
= 18 mA
V
O
Output HIGH Voltage
2.4
3.4
V
V
CC
= MIN, I
OH
= 3.0 mA
V
OH
Output HIGH Voltage
2.0
V
V
CC
= MIN, I
OH
= MAX
V
O
Output LOW Voltage
0.25
0.4
V
I
OL
= 12 mA
V
CC
= V
CC
MIN,
V
IN
= V
IL
or V
IH
V
OL
Output LOW Voltage
0.35
0.5
V
I
OL
= 24 mA
V
IN
= V
IL
or V
IH
per Truth Table
I
OZH
Output Off Current HIGH
20
A
V
CC
= MAX, V
OUT
= 2.7 V
I
OZL
Output Off Current LOW
400
A
V
CC
= MAX, V
OUT
= 0.4 V
A or B, DIR or G
20
A
V
CC
= MAX, V
IN
= 2.7 V
I
IH
Input HIGH Current
DIR or G
0.1
mA
V
CC
= MAX, V
IN
= 7.0 V
A or B
0.1
mA
V
CC
= MAX, V
IN
= 5.5 V
I
IL
Input LOW Current
0.4
mA
V
CC
= MAX, V
IN
= 0.4 V
I
OS
Output Short Circuit Current (Note 1)
40
225
mA
V
CC
= MAX
I
Power Supply Current
Total Output HIGH
70
mA
V
MAX
I
CC
Total, Output LOW
90
mA
V
CC
= MAX
Total at HIGH Z
95
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
(T
A
= 25
C, V
CC
= 5.0 V)
Limits
LS640
LS645
Symbol
Parameter
Min
Typ
Max
Min
Typ
Max
Unit
Test Conditions
t
PLH
t
PHL
Propagation Delay
A to B
6.0
8.0
10
15
8.0
11
15
15
ns
t
PLH
t
PHL
Propagation Delay
B to A
6.0
8.0
10
15
8.0
11
15
15
ns
C
L
= 45 pF,
t
PZL
t
PZH
Output Enable Time
G, DIR to A
31
23
40
40
31
26
40
40
ns
L
R
L
= 667
t
PZL
t
PZH
Output Enable Time
G, DIR to B
31
23
40
40
31
26
40
40
ns
t
PLZ
t
PHZ
Output Disable Time
G, DIR to A
15
15
25
25
15
15
25
25
ns
C = 5 0 pF
t
PLZ
t
PHZ
Output Disable Time
G, DIR to B
15
15
25
25
15
15
25
25
ns
C
L
= 5.0 pF
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
4
SN74LS641
SN74LS642
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
V
IH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
V
IL
Input LOW Voltage
0.6
V
Guaranteed Input LOW Voltage for
All Inputs
V
IK
Input Clamp Diode Voltage
0.65
1.5
V
V
CC
= MIN, I
IN
= 18 mA
I
OH
Output HIGH Current
100
A
V
CC
= MIN, V
OH
= MAX
V
O
Output LOW Voltage
0.25
0.4
V
I
OL
= 12 mA
V
CC
= V
CC
MIN,
V
IN
= V
IL
or V
IH
V
OL
Output LOW Voltage
0.35
0.5
V
I
OL
= 24 mA
V
IN
= V
IL
or V
IH
per Truth Table
I
Input HIGH Current
20
A
V
CC
= MAX, V
IN
= 2.7 V
I
IH
Input HIGH Current
0.1
mA
V
CC
= MAX, V
IN
= 7.0 V
I
IL
Input LOW Current
0.4
mA
V
CC
= MAX, V
IN
= 0.4 V
I
Power Supply Current
Total, Output HIGH
70
A
V
MAX
I
CC
Total, Output LOW
90
mA
V
CC
= MAX
Total at HIGH Z
95
AC CHARACTERISTICS
(T
A
= 25
C, V
CC
= 5.0 V)
Limits
LS641
LS642
Symbol
Parameter
Min
Typ
Max
Min
Typ
Max
Unit
Test Conditions
t
PLH
t
PHL
Propagation Delay,
A to B
17
16
25
25
19
14
25
25
ns
t
PLH
t
PHL
Propagation Delay,
B to A
17
16
25
25
19
14
25
25
ns
C
L
= 45 pF,
t
PLH
t
PHL
Propagation Delay,
G, DIR to A
23
34
40
50
26
43
40
60
ns
L
R
L
= 667
t
PLH
t
PHL
Propagation Delay,
G, DIR to B
25
37
40
50
28
39
40
60
ns
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
5
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 73803
ISSUE E
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
M
L
J
20 PL
M
B
M
0.25 (0.010)
T
DIM
MIN
MAX
MIN
MAX
MILLIMETERS
INCHES
A
25.66
27.17
1.010
1.070
B
6.10
6.60
0.240
0.260
C
3.81
4.57
0.150
0.180
D
0.39
0.55
0.015
0.022
G
2.54 BSC
0.100 BSC
J
0.21
0.38
0.008
0.015
K
2.80
3.55
0.110
0.140
L
7.62 BSC
0.300 BSC
M
0
15
0
15
N
0.51
1.01
0.020
0.040
_
_
_
_
E
1.27
1.77
0.050
0.070
1
11
10
20
A
SEATING
PLANE
K
N
F
G
D
20 PL
T
M
A
M
0.25 (0.010)
T
E
B
C
F
1.27 BSC
0.050 BSC
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
6
PACKAGE DIMENSIONS
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751D05
ISSUE F
20
1
11
10
B
20X
H
10X
C
L
18X
A1
A
SEATING
PLANE
q
h
X 45
_
E
D
M
0.25
M
B
M
0.25
S
A
S
B
T
e
T
B
A
DIM
MIN
MAX
MILLIMETERS
A
2.35
2.65
A1
0.10
0.25
B
0.35
0.49
C
0.23
0.32
D
12.65
12.95
E
7.40
7.60
e
1.27 BSC
H
10.05
10.55
h
0.25
0.75
L
0.50
0.90
q
0
7
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DIMENSIONS D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION SHALL
BE 0.13 TOTAL IN EXCESS OF B DIMENSION AT
MAXIMUM MATERIAL CONDITION.
_
_
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
7
Notes
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
8
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