Datasheet
SN54ACT240, SN74ACT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS515C − JUNE 1995 − REVISED OCTOBER 2002
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D 4.5-V to 5.5-V V
CC
Operation
D Inputs Accept Voltages to 5.5 V
D Max t
pd
of 8.5 ns at 5 V
D Inputs Are TTL Compatible
SN54ACT240 ...J OR W PACKAGE
SN74ACT240 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
3 2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
SN54ACT240...FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
1Y4
2A2 2OE
2Y1
GND
2A1
V
CC
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
description/ordering information
These octal buffers and line 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 ’ACT240 devices are organized as two 4-bit buffers/drivers with separate output-enable (OE
) inputs. When
OE
is low, the device passes inverted 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 SN74ACT240N SN74ACT240N
SOIC DW
Tube SN74ACT240DW
ACT240
40°Cto85°C
SOIC − DW
Tape and reel SN74ACT240DWR
ACT240
−40°C to 85°C
SOP − NS Tape and reel SN74ACT240NSR ACT240
SSOP − DB Tape and reel SN74ACT240DBR AD240
TSSOP − PW Tape and reel SN74ACT240PWR AD240
CDIP − J Tube SNJ54ACT240J SNJ54ACT240J
−55°C to 125°C
CFP − W Tube SNJ54ACT240W SNJ54ACT240W
LCCC − FK Tube SNJ54ACT240FK SNJ54ACT240FK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
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.
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.