SN74LS645 [MOTOROLA]
OCTAL BUS TRANSCEIVERS; 八路总线收发器
| 型号： | SN74LS645 |
| 厂家： | 
MOTOROLA |
| 描述： | OCTAL BUS TRANSCEIVERS |
| 文件： | 总3页 (文件大小：88K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS640
SN54/74LS641
SN54/74LS642
SN54/74LS645
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 transmis-
sion 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.
OCTAL BUS TRANSCEIVERS
LOW POWER SCHOTTKY
DEVICE
LS640
LS641
LS642
LS645
OUTPUT
3-State
Open-Collector
Open-Collector
3-State
LOGIC
Inverting
True
Inverting
True
J SUFFIX
CERAMIC
CASE 732-03
FUNCTION TABLE
20
CONTROL
INPUTS
OPERATION
1
LS640
LS642
LS641
LS645
G
L
DIR
L
N SUFFIX
PLASTIC
CASE 738-03
B data to A bus
A data to B bus
Isolation
B data to A bus
A data to B bus
Isolation
20
L
H
1
H
X
H = HIGH Level, L = LOW Level, X = Irrelevant
DW SUFFIX
SOIC
CASE 751D-03
20
1
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
CONNECTION DIAGRAMS DIP (TOP VIEW)
ENABLE
ENABLE
V
B1
18
B2
17
B3
16
B4
15
B5
14
B6 B7
B8
11
V
B1
18
B2
17
B3
16
B4
15
B5
14
B6 B7
B8
11
G
G
CC
20
CC
20
19
13
12
19
13
12
1
2
3
4
5
6
8
9
10
1
2
3
4
5
6
8
9
10
7
7
DIR A1
A2
A3
A4
A5
A6
A7
A8 GND
DIR A1
A2
A3
A4
A5
A6
A7
A8 GND
SN54/74LS640
SN54/74LS642
SN54/74LS641
SN54/74LS645
FAST AND LS TTL DATA
5-1
SN54/74LS640 • SN54/74LS645
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
Operating Ambient Temperature Range
Output Current — High
54
74
–55
0
25
25
125
70
°C
A
I
54, 74
–3.0
mA
mA
OH
54
74
–12
–15
I
Output Current — Low
54
74
12
24
mA
OL
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Input HIGH Voltage
Min
Typ
Max
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.5
0.6
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.4
–1.5
V
V
V
V
CC
V
CC
V
CC
= MIN, I = –18 mA
IN
IK
54, 74
54, 74
2.4
2.0
= MIN, I
= MIN, I
= 3.0 mA
= MAX
OH
OH
OH
V
V
= V
= V or V
MIN,
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
= 12 mA
= 24 mA
CC
IN
CC
IL
OL
V
OL
Output LOW Voltage
IH
I
per Truth Table
OL
I
I
Output Off Current HIGH
Output Off Current LOW
20
–400
20
µA
µA
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= MAX, V
= MAX, V
= 2.7 V
= 0.4 V
OZH
OUT
OUT
OZL
A or B, DIR or G
DIR or G
µA
= MAX, V = 2.7 V
IN
I
IH
Input HIGH Current
Input LOW Current
0.1
mA
mA
mA
mA
= MAX, V = 7.0 V
IN
A or B
0.1
= MAX, V = 5.5 V
IN
I
I
–0.4
–225
= MAX, V = 0.4 V
IN
IL
Output Short Circuit Current (Note 1)
–40
= MAX
OS
Power Supply Current
Total Output HIGH
70
90
95
I
mA
V
CC
= MAX
CC
Total, Output LOW
Total at HIGH Z
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)
CC
A
Limits
LS640
Typ
LS645
Typ
Symbol
Parameter
Min
Max
Min
Max
Unit
Test Conditions
t
t
Propagation Delay
A to B
6.0
8.0
10
15
8.0
11
15
15
PLH
PHL
ns
t
t
Propagation Delay
B to A
6.0
8.0
10
15
8.0
11
15
15
PLH
PHL
ns
ns
ns
ns
ns
C
R
= 45 pF,
= 667 Ω
L
L
t
t
Output Enable Time
G, DIR to A
31
23
40
40
31
26
40
40
PZL
PZH
t
t
Output Enable Time
G, DIR to B
31
23
40
40
31
26
40
40
PZL
PZH
t
t
Output Disable Time
G, DIR to A
15
15
25
25
15
15
25
25
PLZ
PHZ
C
= 5.0 pF
L
t
t
Output Disable Time
G, DIR to B
15
15
25
25
15
15
25
25
PLZ
PHZ
FAST AND LS TTL DATA
5-2
SN54/74LS641 • SN54/74LS642
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°C
V
Output Current — High
Output Current — Low
54, 74
5.5
V
OH
I
54
74
12
24
mA
OL
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.5
0.6
Guaranteed Input LOW Voltage for
All Inputs
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Current
–0.65
–1.5
100
V
V
V
= MIN, I = –18 mA
IN
IK
CC
I
54, 74
54, 74
µA
= MIN, V
= MAX
OH
OH
CC
V
V
= V
= V or V
MIN,
0.25
0.35
0.4
0.5
V
V
I
= 12 mA
= 24 mA
CC
IN
CC
IL
OL
V
OL
Output LOW Voltage
IH
74
I
OL
per Truth Table
20
µA
mA
mA
V
CC
V
CC
V
CC
= MAX, V = 2.7 V
IN
I
I
Input HIGH Current
Input LOW Current
IH
–0.1
–0.4
= MAX, V = 7.0 V
IN
= MAX, V = 0.4 V
IN
IL
Power Supply Current
Total, Output HIGH
70
90
95
I
mA
V
CC
= MAX
CC
Total, Output LOW
Total at HIGH Z
AC CHARACTERISTICS (T = 25°C, V
= 5.0 V)
CC
A
Limits
LS641
LS642
Typ
Symbol
Parameter
Unit
Test Conditions
Min
Typ
Max
Min
Max
t
t
Propagation Delay,
A to B
17
16
25
25
19
14
25
25
PLH
PHL
ns
t
t
Propagation Delay,
B to A
17
16
25
25
19
14
25
25
PLH
PHL
ns
ns
ns
C
R
= 45 pF,
= 667 Ω
L
L
t
t
Propagation Delay,
G, DIR to A
23
34
40
50
26
43
40
60
PLH
PHL
t
t
Propagation Delay,
G, DIR to B
25
37
40
50
28
39
40
60
PLH
PHL
FAST AND LS TTL DATA
5-3
相关型号：
SN74LS645-1N
LS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDIP20, ROHS COMPLIANT, PLASTIC, DIP-20
ROCHESTER
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