SN54AHC240, SN74AHC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCLS251H – OCTOBER 1995 – REVISED JULY 2003
D
D
Operating Range 2-V to 5.5-V V
CC
Latch-Up Performance Exceeds 250 mA
Per JESD 17
SN54AHC240 . . . J OR W PACKAGE
SN74AHC240 . . . DB, DGV, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
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.
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
SN54AHC240 . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
V
CC
1A2
2Y3
1A3
2Y2
1A4
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
2OE
1Y1
2A4
1Y2
2A3
1Y3
ORDERING INFORMATION
TA
PDIP – N
SOIC – DW
SOP – NS
SSOP – DB
TSSOP – PW
TVSOP – DGV
CDIP – J
–55°C to 125°C
CFP – W
LCCC – FK
PACKAGE†
Tube
Tube
Tape and reel
–40°C to 85°C
Tape and reel
Tape and reel
Tube
Tape and reel
Tape and reel
Tube
Tube
Tube
ORDERABLE
PART NUMBER
SN74AHC240N
SN74AHC240DW
SN74AHC240DWR
SN74AHC240NSR
SN74AHC240DBR
SN74AHC240PW
SN74AHC240PWR
SN74AHC240DGVR
SNJ54AHC240J
SNJ54AHC240W
SNJ54AHC240FK
AHC240
HA240
HA240
HA240
SNJ54AHC240J
SNJ54AHC240W
SNJ54AHC240FK
TOP-SIDE
MARKING
SN74AHC240N
AHC240
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
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
2003, 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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2Y1
GND
2A1
1Y4
2A2
1
TI [ TEXAS INSTRUMENTS ]
