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)
C0049C0056 C0049C0055 C0049C0054 C0049C0053 C0049C0052 C0049C0051
C0049 C0050 C0051 C0052 C0053 C0054 C0055
C0050C0048 C0049C0057
C0056
C0086
C0067C0067
C0057 C0049C0048
C0071C0078C0068
C0049C0050 C0049C0049
SN54/74LS540
SN54/74LS541
C0049C0056 C0049C0055 C0049C0054 C0049C0053 C0049C0052 C0049C0051
C0049 C0050 C0051 C0052 C0053 C0054 C0055
C0050C0048 C0049C0057
C0056
C0086
C0067C0067
C0057 C0049C0048
C0071C0078C0068
C0049C0050 C0049C0049
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage 54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range 54
74
–55
0
25
25
125
70
°C
I
OH
Output Current — High 54
74
–12
–15
mA
I
OL
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