5-568
FAST AND LS TTL DATA
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
The SN54/ 74LS540 and SN54 / 74LS541 are octal buffers and line drivers
with the same functions as the LS240 and LS241, but with pinouts on the
opposite side of the package.
These device types are designed to be used as memory address drivers,
clock drivers and bus-oriented transmitters / receivers. These devices are
especially useful as output ports for the microprocessors, allowing ease of
layout and greater PC board density.
Hysteresis at Inputs to Improve Noise Margin
PNP Inputs Reduce Loading
3-State Outputs Drive Bus Lines
Inputs and Outputs Opposite Side of Package, Allowing Easier
Interface to Microprocessors
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
9
10
GND
12
11
SN54 / 74LS540
SN54 / 74LS541
18
17
16 15 14 13
1
2
3
4
5
6
7
20 19
8
VCC
9
10
GND
12
11
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
12
15
mA
IOL
Output Current -- Low
54
74
12
24
mA
SN54/74LS540
SN54/74LS541
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
BLOCK DIAGRAM
LS540
LS541
E1
E2
D1
D2
D3
D4
D5
D6
D7
D8
Y8
Y7
Y6
Y5
Y4
Y3
Y2
Y1
(1)
(19)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
E1
E2
D1
D2
D3
D4
D5
D6
D7
D8
Y8
Y7
Y6
Y5
Y4
Y3
Y2
Y1
(1)
(19)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
5-569
FAST AND LS TTL DATA
SN54/74LS540
SN54/74LS541
INPUTS
OUTPUTS
E1
E2
D
LS540
LS541
L
L
H
L
H
H
X
X
Z
Z
X
H
X
Z
Z
L
L
L
H
L
L = LOW Voltage Level
H = HIGH Voltage Level
X = Immaterial
Z = High Impedance
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
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, VIL = 0.5 V
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
VT+VT
Hysteresis
0.2
0.4
V
VCC = MIN
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
Short Circuit Current (Note 1)
40
225
mA
VCC = MAX
ICC
Power Supply Current
Total, Output HIGH
LS540
25
mA
VCC = MAX
ICC
LS541
32
mA
VCC = MAX
ICC
Total, Output LOW
Total Output 3-State
LS540
45
mA
VCC = MAX
ICC
Total, Output LOW
Total Output 3-State
LS541
52
mA
VCC = MAX
Total Output 3-State
LS540
52
mA
Total Output 3-State
LS541
55
mA
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC WAVEFORMS
1.5 V
1.5 V
1.5 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
tPLH
tPHL
VE
VE
VOUT
VE
VE
VOUT
tPHZ
1.5 V
1.5 V
tPZL
tPLZ
VOL
1.5 V
VOH
0.5 V
tPZH
1.3 V
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
1.5 V
0.5 V
1.5 V
SWITCH POSITIONS
5-570
FAST AND LS TTL DATA
SN54/74LS540
SN54/74LS541
AC CHARACTERISTICS
(TA = 25
C)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
tPLH
Propagation Delay,
Data to Output
LS540
9.0
15
ns
VCC = 5.0 V
CL = 45 pF
RL = 667
tPLH
Propagation Delay,
Data to Output
LS541
12
15
ns
VCC = 5.0 V
CL = 45 pF
RL = 667
tPHL
Propagation Delay,
Data to Output
LS540
12
15
ns
VCC = 5.0 V
CL = 45 pF
RL = 667
tPHL
LS541
12
18
VCC = 5.0 V
CL = 45 pF
RL = 667
tPZH
Output Enable Time
to HIGH Level
LS540
15
25
ns
CL = 45 pF
RL = 667
tPZH
Output Enable Time
to HIGH Level
LS541
15
32
ns
L = 667
tPZL
Output Enable Time
to LOW Level
LS540
20
38
ns
tPZL
Output Enable Time
to LOW Level
LS541
20
38
ns
tPHZ
Output Disable Time
to HIGH Level
LS540
10
18
ns
CL = 5.0 pF
tPHZ
Output Disable Time
to HIGH Level
LS541
10
18
ns
CL = 5.0 pF
tPLZ
Output Disable Time
to LOW Level
LS540
15
25
ns
CL = 5.0 pF
tPLZ
Output Disable Time
to LOW Level
LS541
15
29
ns
SYMBOL
SW1
SW2
tPZH
Open
Closed
tPZL
Closed
Open
tPLZ
Closed
Closed
tPHZ
Closed
Closed
5-571
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
5-572
FAST AND LS TTL DATA
SYMBOL
SW1
SW2
tPZH
Open
Closed
tPZL
Closed
Open
tPLZ
Closed
Closed
tPHZ
Closed
Closed
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