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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.
SN54/74LS540
SN54/74LS541
OCTAL BUFFER / LINE DRIVER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
•
•
•
•
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)
VCC
20 19
20
1
J SUFFIX
CERAMIC
CASE 732-03
SN54 / 74LS540
18
17
16
15
14
13
12
11
20
1
N SUFFIX
PLASTIC
CASE 738-03
1
2
3
4
5
6
7
8
9
10
GND
20
1
DW SUFFIX
SOIC
CASE 751D-03
VCC
20 19
SN54 / 74LS541
18
17
16
15
14
13
12
11
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
1
2
3
4
5
6
7
8
9
10
GND
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
IOH
IOL
Supply Voltage
Operating Ambient Temperature Range
Output Current — High
Output Current — Low
Parameter
54
74
54
74
54
74
54
74
Min
4.5
4.75
– 55
0
Typ
5.0
5.0
25
25
Max
5.5
5.25
125
70
– 12
– 15
12
24
Unit
V
°C
mA
mA
FAST AND LS TTL DATA
5-1
SN54/74LS540
•
SN54/74LS541
BLOCK DIAGRAM
LS540
(1)
E1
(19)
E2
(2)
(18)
(1)
E1
(19)
E2
(2)
(18)
LS541
INPUTS
E1
Y1
L
H
X
L
E2
L
X
H
L
D
H
X
X
L
OUTPUTS
LS540
L
Z
Z
H
LS541
H
Z
Z
L
D1
D2
D3
D4
D5
D6
D7
D8
Y1
D1
D2
D3
D4
D5
D6
D7
D8
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(17)
(16)
(15)
(14)
(13)
Y2
Y3
Y4
Y5
Y6
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(17)
(16)
(15)
(14)
(13)
Y2
Y3
Y4
Y5
Y6
L = LOW Voltage Level
H = HIGH Voltage Level
X = Immaterial
Z = High Impedance
(12)
Y7
(11)
Y8
(12)
Y7
(11)
Y8
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
S b l
VIH
VIL
VIK
VOH
Parameter
P
Input HIGH Voltage
54
Input LOW Voltage
74
Input Clamp Diode Voltage
54, 74
Output HIGH Voltage
54, 74
54, 74
VOL
VT+–VT–
IOZH
IOZL
IIH
IIL
IOS
Output LOW Voltage
74
Hysteresis
Output Off Current HIGH
Output Off Current LOW
Input HIGH Current
0.1
Input LOW Current
Short Circuit Current (Note 1)
Power Supply Current
Total, Output HIGH
LS540
LS541
ICC
LS540
Total,
Total Output LOW
LS541
LS540
LS541
– 40
– 0.2
– 225
25
32
45
52
52
55
0.2
0.35
0.4
20
– 20
20
0.5
V
V
µA
µA
µA
mA
mA
mA
mA
mA
mA
mA
mA
mA
VCC = MAX
2.0
0.25
0.4
V
V
2.4
– 0.65
3.4
0.8
– 1.5
V
V
Min
2.0
0.7
V
Typ
Max
Unit
U i
V
Test C di i
T
Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
p
g
All Inputs
VCC = MIN, IIN = – 18 mA
VCC = MIN, IOH = – 3.0 mA
VCC = MIN, IOH = MAX, VIL = 0.5 V
IOL = 12 mA
IOL = 24 mA
VCC = MIN
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 = 0.4 V
VCC = MAX
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
Total Output 3-State
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
5-2
Microcontroller MCU
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