5-387
FAST AND LS TTL DATA
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
The SN54 / 74LS240, 241 and 244 are Octal Buffers and Line Drivers
designed to be employed as memory address drivers, clock drivers and
bus-oriented transmitters/receivers which provide improved PC board
density.
Hysteresis at Inputs to Improve Noise Margins
3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
Input Clamp Diodes Limit High-Speed Termination Effects
LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)
18
17
16
15
14
13
1
2
3
4
5
6
7
20
19
8
VCC
1G
2G 1Y1 2A4 1Y2
1Y3
2A3
2A2
1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4
9
10
2Y1 GND
12
11
1Y4 2A1
18
17
16
15
14
13
1
2
3
4
5
6
7
20
19
8
VCC
1G
2G 1Y1 2A4 1Y2
1Y3
2A3
2A2
1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4
9
10
2Y1 GND
12
11
1Y4 2A1
18
17
16
15
14
13
1
2
3
4
5
6
7
20
19
8
VCC
1G
2G 1Y1 2A4 1Y2
1Y3
2A3
2A2
1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4
9
10
2Y1 GND
12
11
1Y4 2A1
SN54 / 74LS240
SN54 / 74LS241
SN54 / 74LS244
SN54/74LS240
SN54/74LS241
SN54/74LS244
OCTAL BUFFER / LINE DRIVER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN
Plastic
SN74LSXXXDW SOIC
20
1
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
20
1
DW SUFFIX
SOIC
CASE 751D-03
5-388
FAST AND LS TTL DATA
SN54/74LS240
SN54/74LS241
SN54/74LS244
TRUTH TABLES
SN54 / 74LS240
INPUTS
OUTPUT
1G, 2G
D
OUTPUT
L
L
H
L
H
X
H
L
(Z)
SN54 / 74LS244
INPUTS
OUTPUT
1G, 2G
D
OUTPUT
L
L
H
L
H
X
L
H
(Z)
SN54 / 74LS241
INPUTS
OUTPUT
INPUTS
OUTPUT
1G
D
OUTPUT
2G
D
OUTPUT
L
L
H
L
H
X
L
H
(Z)
H
H
L
L
H
X
L
H
(Z)
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = HIGH Impedance
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
TA
Operating Ambient Temperature Range
54
74
55
0
25
25
125
70
C
IOH
Output Current -- High
54, 74
3.0
mA
OH
54
74
12
15
mA
IOL
Output Current -- Low
54
74
12
24
mA
5-389
FAST AND LS TTL DATA
SN54/74LS240
SN54/74LS241
SN54/74LS244
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54
0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
Input LOW Voltage
74
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VT+VT
Hysteresis
0.2
0.4
V
VCC = MIN
VIK
Input Clamp Diode Voltage
0.65
1.5
V
VCC = MIN, IIN = 18 mA
VOH
Output HIGH Voltage
54, 74
2.4
3.4
V
VCC = MIN, IOH = 3.0 mA
VOH
Output HIGH Voltage
54, 74
2.0
V
VCC = MIN, IOH = MAX
VOL
Output LOW Voltage
54, 74
0.25
0.4
V
IOL = 12 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
Output LOW Voltage
74
0.35
0.5
V
IOL = 24 mA
VIN = VIL or VIH
per Truth Table
IOZH
Output Off Current HIGH
20
A
VCC = MAX, VOUT = 2.7 V
IOZL
Output Off Current LOW
20
A
VCC = MAX, VOUT = 0.4 V
IIH
Input HIGH Current
20
A
VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
0.1
mA
VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
0.2
mA
VCC = MAX, VIN = 0.4 V
IOS
Output Short Circuit Current (Note 1)
40
225
mA
VCC = MAX
ICC
Power Supply Current
Total, Output HIGH
27
mA
VCC = MAX
ICC
Total, Output LOW
LS240
44
mA
VCC = MAX
ICC
LS241/244
46
mA
VCC = MAX
Total at HIGH Z
LS240
50
LS241/244
54
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)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
tPLH
tPHL
Propagation Delay, Data to Output
LS240
9.0
12
14
18
ns
CL = 45 pF,
RL = 667
tPLH
tPHL
Propagation Delay, Data to Output
LS241 / 244
12
12
18
18
ns
CL = 45 pF,
RL = 667
tPZH
Output Enable Time to HIGH Level
15
23
ns
L = 667
tPZL
Output Enable Time to LOW Level
20
30
ns
tPLZ
Output Disable Time from LOW Level
15
25
ns
CL = 5.0 pF,
RL = 667
tPHZ
Output Disable Time from HIGH Level
10
18
ns
CL = 5.0 pF,
RL = 667
AC WAVEFORMS
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
VIN
VOUT
tPLH
tPHL
1.3 V
1.3 V
VIN
VOUT
SW2
CL*
5 k
SW1
VCC
RL
TO OUTPUT
UNDER TEST
1.3 V
tPHL
tPLH
VE
VE
VOUT
VE
VE
VOUT
tPHZ
1.3 V
1.3 V
tPZL
tPLZ
VOL
1.3 V
VOH
0.5 V
tPZH
1.3 V
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
1.3 V
0.5 V
1.3 V
SWITCH POSITIONS
5-390
FAST AND LS TTL DATA
SN54/74LS240
SN54/74LS241
SN54/74LS244
5-391
FAST AND LS TTL DATA
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. 751D 01, AND 02 OBSOLETE, NEW STANDARD
751D 03.
MIN
MIN
MAX
MAX
MILLIMETERS
INCHES
DIM
A
B
C
D
F
G
J
K
M
P
R
12.65
7.40
2.35
0.35
0.50
0.25
0.10
0
10.05
0.25
12.95
7.60
2.65
0.49
0.90
0.32
0.25
7
10.55
0.75
0.499
0.292
0.093
0.014
0.020
0.010
0.004
0
0.395
0.010
0.510
0.299
0.104
0.019
0.035
0.012
0.009
7
0.415
0.029
1.27 BSC
0.050 BSC
-A-
-B-
P
10 PL
1
10
11
20
G
-T-
D
20 PL
K
C
SEATING
PLANE
R X 45
M
F
J
Case 751D-03 DW Suffix
20-Pin Plastic
SO-20 (WIDE)
B
0.25 (0.010)
M
M
T
0.25 (0.010)
B
A
M
S
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
MATERIAL CONDITION.
2. DIM L TO CENTER OF LEADS WHEN FORMED
PARALLEL.
3. DIM A AND B INCLUDES MENISCUS.
MIN
MIN
MAX
MAX
MILLIMETERS
INCHES
DIM
23.88
6.60
3.81
0.38
1.40
0.51
0.20
3.18
25.15
7.49
5.08
0.56
1.65
1.27
0.30
4.06
0
0.25
0.940
0.260
0.150
0.015
0.055
0.020
0.008
0.125
0.990
0.295
0.200
0.022
0.065
0.050
0.012
0.160
15
1.02
2.54 BSC
7.62 BSC
0.100 BSC
0.300 BSC
A
B
C
D
F
G
H
J
K
L
M
N
0
0.010
15
0.040
B
C
D
G
H
J
M
N
A
L
20
11
1
10
SEATING
PLANE
K
F
Case 738-03 N Suffix
20-Pin Plastic
MIN
MIN
MAX
MAX
MILLIMETERS
INCHES
DIM
25.66
6.10
3.81
0.39
1.27
0.21
2.80
27.17
6.60
4.57
0.55
1.77
0.38
3.55
0
0.51
1.010
0.240
0.150
0.015
0.050
0.008
0.110
1.070
0.260
0.180
0.022
0.070
0.015
0.140
15
1.01
1.27 BSC
2.54 BSC
7.62 BSC
0.050 BSC
0.100 BSC
0.300 BSC
A
B
C
D
E
F
G
J
K
L
M
N
0
0.020
15
0.040
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.
5. 738 02 OBSOLETE, NEW STANDARD 738 03.
-A-
B
C
K
N
E
G
F
D
20 PL
J
20 PL
L
M
-T-
SEATING
PLANE
1
10
11
20
T A
0.25 (0.010)
M
M
T B
0.25 (0.010)
M
M
5-392
FAST AND LS TTL DATA
SYMBOL
SW1
SW2
tPZH
Open
Closed
tPZL
Closed
Open
tPLZ
Closed
Closed
tPHZ
Closed
Closed
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