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
ONSEMI [ ON SEMICONDUCTOR ]
