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SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D2-V to 6-V VCC Operation
DInputs Accept Voltages to 6 V
DMax tpd of 6.5 ns at 5 V
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 ’AC240 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 VCC
through a pullup resistor; the minimum value of
the resistor is determined by the current-sinking
capability of the driver.
ORDERING INFORMATION
TAPACKAGE†ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N Tube SN74AC240N SN74AC240N
SOIC DW
Tube SN74AC240DW
AC240
SOIC − DW Tape and reel SN74AC240DWR AC240
−40° °C to 85 C SOP − NS Tape and reel SN74AC240NSR AC240
40 C
to
85 C
SSOP − DB Tape and reel SN74AC240DBR AC240
TSSOP PW
Tube SN74AC240PW
AC240
TSSOP − PW Tape and reel SN74AC240PWR AC240
CDIP − J Tube SNJ54AC240J SNJ54AC240J
−55° °C to 125 C CFP − W Tube SNJ54AC240W SNJ54AC240W
55 C
to
125 C
LCCC − FK Tube SNJ54AC240FK SNJ54AC240FK
†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.
SN54AC240 . . . J OR W PACKAGE
SN74AC240 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
3 2 1 20 19
9 10 12 1311
4
5
6
7
8
18
17
16
15
14
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
SN54AC240 . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
1Y4
2A2 2OE
2Y1
GND
2A1 VCC
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
VCC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
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.
SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FUNCTION TABLE
(each buffer)
INPUTS OUTPUT
OE A
OUTPUT
Y
L H L
L L H
H X Z
logic diagram (positive logic)
1
2
4
6
812
14
16
18
1A1
1A2
1A3
1A4
1Y1
1Y2
1Y3
1Y4
1OE
19
11
13
15
17 3
5
7
9
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
2OE
SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1) −0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, VO (see Note 1) −0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0 or VI > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0 or VO > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, IO (VO = 0 to VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through VCC or GND ±200 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): DB package 70°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package 58°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 69°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package 60°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 83°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg −65° °C to 150 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 3)
SN54AC240 SN74AC240
UNIT
MIN MAX MIN MAX UNIT
VCC Supply voltage 2 6 2 6 V
VCC = 3 V 2.1 2.1
VIH High-level input voltage VCC = 4.5 V 3.15 3.15 V
VIH
VCC = 5.5 V 3.85 3.85
V
VCC = 3 V 0.9 0.9
VIL Low-level input voltage VCC = 4.5 V 1.35 1.35 V
VIL
VCC = 5.5 V 1.65 1.65
V
VIInput voltage 0 VCC 0 VCC V
VOOutput voltage 0 VCC 0 VCC V
VCC = 3 V −12 −12
IOH High-level output current VCC = 4.5 V −24 −24 mA
IOH
VCC = 5.5 V −24 −24
mA
VCC = 3 V 12 12
IOL Low-level output current VCC = 4.5 V 24 24 mA
IOL
VCC = 5.5 V 24 24
mA
Δ Δt/ v 8 8 ns/VInput transition rise or fall rate
TAOperating free-air temperature −55 125 −40 85 C°
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

Produktspecifikationer

Varumärke: Texas Instruments
Kategori: Inte kategoriserad
Modell: SN74AC240DW

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