SN54LS240, SN54LS241, SN54LS244, SN54S240, SN54S241, SN54S244
SN74LS240, SN74LS241, SN74LS244, SN74S240, SN74S241, SN74S244
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SDLS144B – APRIL 1985 – REVISED FEBRUARY 2002
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
PNP Inputs Reduce DC Loading
Hysteresis at Inputs Improves Noise
Margins
description
These octal buffers and line drivers are designed
specifically to improve both the performance and
density of three-state memory address drivers,
clock drivers, and bus-oriented receivers and
transmitters. The designer has a choice of
selected combinations of inverting and
noninverting outputs, symmetrical, active-low
output-control (G
) inputs, and complementary
output-control (G and G
) inputs. These devices
feature high fan-out, improved fan-in, and 400-mV
noise margin. The SN74LS’ and SN74S’ devices
can be used to drive terminated lines down to
133 Ω.
Copyright 2002, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1G
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
V
CC
2G/2G
†
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
SN54LS’, SN54S’ ...J OR W PACKAGE
SN74LS240, SN74LS244 . . . DB, DW, N, OR NS PACKAGE
SN74LS241 ...DW, N, OR NS PACKAGE
SN74S’ . . . DW OR N PACKAGE
(TOP VIEW)
3 2 1 20 19
910111213
4
5
6
7
8
18
17
16
15
14
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
SN54LS’, SN54S’ . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1G
1Y4
2A2 2G/2G
2Y1
GND
2A1
V
CC
†
2G for ’LS241 and ’S241 or 2G
for all other drivers.
†
2G for ’LS241 and ’S241 or 2G
for all other drivers.
†
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
