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
SN54LS’, SN54S’ . . . J OR W PACKAGE
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
SN74LS240, SN74LS244 . . . DB, DW, N, OR NS PACKAGE
SN74LS241 . . . DW, N, OR NS PACKAGE
SN74S’ . . . DW OR N PACKAGE
PNP Inputs Reduce DC Loading
(TOP VIEW)
Hysteresis at Inputs Improves Noise
Margins
1G
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
V
CC
2G/2G
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
†
description
1Y1
2A4
1Y2
2A3
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
featurehighfan-out, improvedfan-in, and400-mV
noise margin. The SN74LS’ and SN74S’ devices
can be used to drive terminated lines down to
133 Ω.
1Y3
13 2A2
12 1Y4
11
2A1
†
2G for ’LS241 and ’S241 or 2G for all other drivers.
SN54LS’, SN54S’ . . . FK PACKAGE
(TOP VIEW)
3
2
1
20 19
18
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
4
5
6
7
8
17
16
15
14
9 10 11 12 13
†
2G for ’LS241 and ’S241 or 2G for all other drivers.
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.
Copyright 2002, Texas Instruments Incorporated
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.
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.
1
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TI [ TEXAS INSTRUMENTS ]
