SN74LS245
Octal Bus Transceiver
The SN74LS245 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.
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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)
V
CC
20
E
19
B1
18
B2
17
B3
16
B4
15
B5
14
B6
13
B7
12
B8
11
LOW
POWER
SCHOTTKY
20
1
1
DIR
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
10
GND
PLASTIC
N SUFFIX
CASE 738
TRUTH TABLE
INPUTS
OUTPUT
E
L
L
H
DIR
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
Isolation
20
1
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
SOIC
DW SUFFIX
CASE 751D
GUARANTEED OPERATING RANGES
Symbol
V
CC
T
A
I
OH
Parameter
Supply Voltage
Operating Ambient
Temperature Range
Output Current – High
Min
4.75
0
Typ
5.0
25
Max
5.25
70
– 3.0
– 15
I
OL
Output Current – Low
24
Unit
V
°C
mA
mA
mA
Device
SN74LS245N
SN74LS245DW
Package
16 Pin DIP
16 Pin
Shipping
1440 Units/Box
2500/Tape & Reel
ORDERING INFORMATION
©
Semiconductor Components Industries, LLC, 1999
1
December, 1999 – Rev. 6
Publication Order Number:
SN74LS245/D
SN74LS245
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
V
IH
V
IL
V
T+
–V
T–
V
IK
V
O
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Hysteresis
Input Clamp Diode Voltage
2.4
Output HIGH Voltage
2.0
0.25
V
O
OL
I
OZH
I
OZL
Output LOW Voltage
0.35
Output Off Current HIGH
Output Off Current LOW
A or B, DR or
E
I
IH
Input HIGH C
I
t
Current
t
DR or E
A or B
I
IL
I
OS
Input LOW Current
Output Short Circuit Current (Note 1)
Power Supply Current
Total, Output HIGH
I
CC
Total, Output LOW
Total at HIGH Z
– 40
0.5
20
– 200
20
0.1
0.1
– 0.2
– 225
70
90
95
mA
A
V
CC
= MAX
V
µA
µA
µA
mA
mA
mA
mA
I
OL
= 24 mA
0.4
V
V
0.2
0.4
– 0.65
3.4
– 1.5
Min
2.0
0.8
Typ
Max
Unit
V
V
V
V
V
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
V
CC
= MIN
V
CC
= MIN, I
IN
= – 18 mA
V
CC
= MIN, I
OH
= – 3.0 mA
V
CC
= MIN, I
OH
= MAX
I
OL
= 12 mA
V
CC
= V
CC
MIN,
V
IN
= V
IL
or V
IH
per Truth Table
V
CC
= MAX, V
OUT
= 2.7 V
V
CC
= MAX, V
OUT
= 0.4 V
V
CC
= MAX, V
IN
= 2.7 V
V
CC
= MAX, V
IN
= 7.0 V
V
CC
= MAX, V
IN
= 5.5 V
V
CC
= MAX, V
IN
= 0.4 V
V
CC
= MAX
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, T
RISE
/ T
FALL
≤
6.0 ns)
Limits
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PLZ
t
PHZ
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
C
L
= 5.0 pF,
R
L
= 667
Ω
C
L
= 45 pF,
F,
R
L
= 667
Ω
Test Conditions
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SN74LS245
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 738–03
ISSUE E
–A–
20
11
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.
INCHES
MIN
MAX
1.010
1.070
0.240
0.260
0.150
0.180
0.015
0.022
0.050 BSC
0.050
0.070
0.100 BSC
0.008
0.015
0.110
0.140
0.300 BSC
0
_
15
_
0.020
0.040
MILLIMETERS
MIN
MAX
25.66
27.17
6.10
6.60
3.81
4.57
0.39
0.55
1.27 BSC
1.27
1.77
2.54 BSC
0.21
0.38
2.80
3.55
7.62 BSC
0
_
15
_
0.51
1.01
B
1
10
C
L
–T–
SEATING
PLANE
K
M
E
G
F
D
20 PL
N
J
0.25 (0.010)
M
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
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751D–05
ISSUE F
D
A
11
X 45
_
q
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.
MILLIMETERS
MIN
MAX
2.35
2.65
0.10
0.25
0.35
0.49
0.23
0.32
12.65
12.95
7.40
7.60
1.27 BSC
10.05
10.55
0.25
0.75
0.50
0.90
0
_
7
_
H
M
B
M
20
10X
0.25
E
1
10
h
20X
B
0.25
M
B
T A
S
B
S
A
SEATING
PLANE
DIM
A
A1
B
C
D
E
e
H
h
L
L
18X
e
A1
q
T
C
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3
SN74LS245
ON Semiconductor
and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC 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 special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC 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 SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC 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 SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–8549
Phone:
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