Semiconductor Components Industries, LLC, 2000
August, 2000 Rev. 7
1
Publication Order Number:
SN74LS245/D
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.
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)
18
17
16
15
14
13
1
2
3
4
5
6
7
20
19
8
V
CC
DIR
E
B1
B2
B3
B5
B4
B6
A1
A2
A3
A4
A5
A6
A7
9
10
A8 GND
12
11
B7
B8
TRUTH TABLE
INPUTS
OUTPUT
E
DIR
OUTPUT
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
Isolation
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
GUARANTEED OPERATING RANGES
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
LOW
POWER
SCHOTTKY
Device
Package
Shipping
ORDERING INFORMATION
SN74LS245N
PDIP20
1440 Units/Box
SN74LS245DW
SOIC20
http://onsemi.com
2500/Tape & Reel
PDIP20
N SUFFIX
CASE 738
20
1
20
1
A
= Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
SN74LS245N
AWLYYWW
MARKING
DIAGRAMS
LS245
AWLYYWW
SOIC20
DW SUFFIX
CASE 751D
1
1
SN74LS245
http://onsemi.com
2
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
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
V
T+
V
T
Hysteresis
0.2
0.4
V
V
CC
= MIN
V
IK
Input Clamp Diode Voltage
0.65
1.5
V
V
CC
= MIN, I
IN
= 18 mA
V
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
Output LOW Voltage
0.25
0.4
V
I
OL
= 12 mA
V
CC
= V
CC
MIN,
V
V
or V
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
200
A
V
CC
= MAX, V
OUT
= 0.4 V
A or B, DR or
E
20
A
V
CC
= MAX, V
IN
= 2.7 V
I
IH
Input HIGH Current
DR or E
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
0.2
mA
V
CC
= MAX, V
IN
= 0.4 V
I
OS
Output Short Circuit Current (Note 1.)
40
225
mA
V
CC
= MAX
Power Supply Current
Total, Output HIGH
70
I
CC
Total, Output LOW
90
mA
V
CC
= MAX
Total at HIGH Z
95
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
Parameter
Min
Typ
Max
Unit
Test Conditions
t
PLH
t
PHL
Propagation Delay, Data to Output
8.0
8.0
12
12
ns
C
L
= 45 pF,
t
PZH
Output Enable Time to HIGH Level
25
40
ns
C
L
= 45 pF,
R
L
= 667
t
PZL
Output Enable Time to LOW Level
27
40
ns
t
PLZ
Output Disable Time from LOW Level
15
25
ns
C
L
= 5.0 pF,
t
PHZ
Output Disable Time from HIGH Level
15
25
ns
C
L
= 5.0 F,
R
L
= 667
SN74LS245
http://onsemi.com
3
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
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.
_
_
SN74LS245
http://onsemi.com
4
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