The SN54 / 74LS245 is an Octal Bus Transmitter/Receiver designed for
8-line asynchronous 2-way data communication between data buses.
Direction Input (DR) controls transmission of Data from bus A to bus B or bus
B to bus A depending upon its logic level. The Enable input (E) can be used
to isolate the buses.
OCTAL BUS TRANSCEIVER
LOW POWER SCHOTTKY
•
•
•
•
Hysteresis Inputs to Improve Noise Immunity
2-Way Asynchronous Data Bus Communication
Input Diodes Limit High-Speed Termination Effects
ESD > 3500 Volts
LOGIC AND CONNECTION DIAGRAMS DIP
(TOP VIEW)
VCC
20
E
19
B1
18
B2
17
B3
16
B4
15
B5
14
B6
13
B7
12
B8
11
20
1
J SUFFIX
CERAMIC
CASE 732-03
1
DIR
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
10
GND
20
1
N SUFFIX
PLASTIC
CASE 738-03
TRUTH TABLE
INPUTS
E
L
L
H
DIR
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
Isolation
OUTPUT
20
1
DW SUFFIX
SOIC
CASE 751D-03
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
IOH
Supply Voltage
Operating Ambient Temperature Range
Output Current — High
Parameter
54
74
54
74
54, 74
54
74
IOL
Output Current — Low
54
74
Min
4.5
4.75
– 55
0
Typ
5.0
5.0
25
25
Max
5.5
5.25
125
70
– 3.0
– 12
– 15
12
24
Unit
V
°C
mA
mA
mA
FAST AND LS TTL DATA
5-398
SN54/74LS245
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
VIH
VIL
VT+–VT–
VIK
VOH
Parameter
Input HIGH Voltage
54
Input LOW Voltage
74
Hysteresis
Input Clamp Diode Voltage
54, 74
Output HIGH Voltage
54, 74
54, 74
VOL
IOZH
IOZL
Output LOW Voltage
74
Output Off Current HIGH
Output Off Current LOW
A or B, DR or E
IIH
Input HIGH Current
DR or E
A or B
IIL
IOS
Input LOW Current
Output Short Circuit Current (Note 1)
Power Supply Current
Total, Output HIGH
ICC
Total, Output LOW
Total at HIGH Z
– 40
0.35
0.5
20
– 200
20
0.1
0.1
– 0.2
– 225
70
90
95
mA
VCC = MAX
V
µA
µA
µA
mA
mA
mA
mA
2.0
0.25
0.4
V
V
2.4
0.2
0.4
– 0.65
3.4
– 1.5
0.8
V
V
V
Min
2.0
0.7
V
Typ
Max
Unit
V
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
VCC = MIN
VCC = MIN, IIN = – 18 mA
VCC = MIN, IOH = – 3.0 mA
VCC = MIN, IOH = MAX
IOL = 12 mA
IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VCC = MAX, VOUT = 2.7 V
VCC = MAX, VOUT = 0.4 V
VCC = MAX, VIN = 2.7 V
VCC = MAX, VIN = 7.0 V
VCC = MAX, VIN = 5.5 V
VCC = MAX, VIN = 0.4 V
VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
(TA = 25°C, VCC = 5.0 V, TRISE / TFALL
≤
6.0 ns)
Limits
Symbol
tPLH
tPHL
tPZH
tPZL
tPLZ
tPHZ
Parameter
Propagation Delay, Data to Output
Output Enable Time to HIGH Level
Output Enable Time to LOW Level
Output Disable Time from LOW Level
Output Disable Time from HIGH Level
Min
Typ
8.0
8.0
25
27
15
15
Max
12
12
40
40
25
25
Unit
ns
ns
ns
ns
ns
CL = 5.0 pF,
RL = 667
Ω
CL = 45 pF,
RL = 667
Ω
Test Conditions
FAST AND LS TTL DATA
5-399
Case 751D-03 DW Suffix
20-Pin Plastic
SO-20 (WIDE)
-A-
20
11
NOTES:
1.
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2.
3.
CONTROLLING DIMENSION: MILLIMETER.
DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4.
MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
-B-
1
10
P
0.25 (0.010)
M
B
M
5.
751D 01, AND 02 OBSOLETE, NEW STANDARD
751D 03.
10 PL
G
R X 45°
-T-
C
K
M
SEATING
PLANE
M
D
20 PL
0.25 (0.010)
T
B
S
F
J
DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
12.65
7.40
2.35
0.35
0.50
12.95
7.60
2.65
0.49
0.90
INCHES
MIN
MAX
0.499
0.292
0.093
0.014
0.020
0.510
0.299
0.104
0.019
0.035
1.27 BSC
0.25
0.10
0
0.32
0.25
7
0.050 BSC
0.010
0.004
0
0.012
0.009
7
°
°
°
°
10.05
0.25
10.55
0.75
0.395
0.010
0.415
0.029
A
S
Case 732-03 J Suffix
20-Pin Ceramic Dual In-Line
NOTES:
1.
LEADS WITHIN 0.25 mm (0.010) DIA., TRUE
POSITION AT SEATING PLANE, AT MAXIMUM
20
1
11
2.
MATERIAL CONDITION.
DIM L TO CENTER OF LEADS WHEN FORMED
PARALLEL.
10
3.
DIM A AND B INCLUDES MENISCUS.
B
A
F
C
L
N
H
D
SEATING
PLANE
J
M
G
K
DIM
A
B
C
D
F
G
H
J
K
L
M
N
MILLIMETERS
MIN
MAX
23.88
6.60
3.81
0.38
1.40
25.15
7.49
5.08
0.56
1.65
INCHES
MIN
MAX
0.940
0.260
0.150
0.015
0.055
0.990
0.295
0.200
0.022
0.065
2.54 BSC
0.51
0.20
3.18
1.27
0.30
4.06
0.100 BSC
0.020
0.008
0.125
0.050
0.012
0.160
7.62 BSC
0
°
15
°
0.300 BSC
0
°
15
°
0.25
1.02
0.010
0.040
Case 738-03 N Suffix
20-Pin Plastic
-A-
20
1
11
10
NOTES:
1.
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2.
3.
CONTROLLING DIMENSION: INCH.
DIMENSION L" TO CENTER OF LEAD WHEN
FORMED PARALLEL.
B
C
L
4.
DIMENSION B" DOES NOT INCLUDE MOLD
FLASH.
5.
738 02 OBSOLETE, NEW STANDARD 738 03.
-T-
SEATING
PLANE
K
E
G
F
D
20 PL
0.25 (0.010)
M
N
M
J
20 PL
0.25 (0.010)
T
A
M
M
T
B
M
DIM
A
B
C
D
E
F
G
J
K
L
M
N
MILLIMETERS
MIN
MAX
25.66
6.10
3.81
0.39
27.17
6.60
4.57
0.55
INCHES
MIN
MAX
1.010
0.240
0.150
0.015
1.070
0.260
0.180
0.022
1.27 BSC
1.27
1.77
0.050 BSC
0.050
0.070
2.54 BSC
0.21
2.80
0.38
3.55
0.100 BSC
0.008
0.110
0.015
0.140
7.62 BSC
0
°
15
°
0.300 BSC
0
°
15
°
0.51
1.01
0.020
0.040
FAST AND LS TTL DATA
5-400
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit,
and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different
applications. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does
not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in
systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of
the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such
unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless
against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
Literature Distribution Centers:
USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036.
tPZH
Open
Closed
EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England.
JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan.
tPZL
Closed
Open
ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.
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