SN54AHC240, SN74AHC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SCLS251H – OCTOBER 1995 – REVISED JULY 2003
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
C0068 Operating Range 2-V to 5.5-V V
CC
C0068 Latch-Up Performance Exceeds 250 mA
Per JESD 17
description/ordering information
These octal buffers/drivers are designed
specifically to improve the performance and
density of 3-state memory-address drivers, clock
drivers, and bus-oriented receivers and
transmitters.
The ’AHC240 devices are organized as two 4-bit
buffers/line drivers with separate output-enable
(OE) inputs. When OE is low, the device passes
data from the A inputs to the Y outputs. When OE
is high, the outputs are in the high-impedance
state.
To ensure the high-impedance state during power
up or power down, OE should be tied to V
CC
through a pullup resistor; the minimum value of
the resistor is determined by the current-sinking
capability of the driver.
ORDERING INFORMATION
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – N Tube SN74AHC240N SN74AHC240N
SOIC – DW
Tube SN74AHC240DW
AHC240 – DW
Tape and reel SN74AHC240DWR
–40°Cto85°C
SOP – NS Tape and reel SN74AHC240NSR AHC240
–40 C to 85
SSOP – DB Tape and reel SN74AHC240DBR HA240
TSSOP PW
Tube SN74AHC240PW
HA240 –
Tape and reel SN74AHC240PWR
TVSOP – DGV Tape and reel SN74AHC240DGVR HA240
CDIP – J Tube SNJ54AHC240J SNJ54AHC240J
–55°C to 125°C CFP – W Tube SNJ54AHC240W SNJ54AHC240W
LCCC – FK Tube SNJ54AHC240FK SNJ54AHC240FK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
Copyright  2003, 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
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
SN54AHC240 ...J OR W PACKAGE
SN74AHC240 . . . DB, DGV, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
SN54AHC240 . . . FK PACKAGE
(TOP VIEW)
2Y4 1A1 1OE
1Y4 2A2
2OE
2Y1
GND
2A1
V
CC
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.