SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
D 2-V to 6-V VCC Operation
D Inputs Accept Voltages to 6 V
D Max tpd of 6.5 ns at 5 V
SN54AC240 . . . J OR W PACKAGE
SN74AC240 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
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.
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
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.
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
1Y1
2A4
1Y2
2A3
1Y3
2Y1
GND
2A1
1Y4
2A2
1A2
2Y3
1A3
2Y2
1A4
2OE
2Y4
1A1
1OE
VCC
SN54AC240 . . . FK PACKAGE
(TOP VIEW)
ORDERING INFORMATION
PDIP − N
SN74AC240N
Tube
SN74AC240DW
Tape and reel
SN74AC240DWR
SOP − NS
Tape and reel
SN74AC240NSR
AC240
SSOP − DB
Tape and reel
SN74AC240DBR
AC240
Tube
SN74AC240PW
Tape and reel
SN74AC240PWR
CDIP − J
Tube
SNJ54AC240J
SNJ54AC240J
CFP − W
Tube
SNJ54AC240W
SNJ54AC240W
LCCC − FK
Tube
SNJ54AC240FK
SNJ54AC240FK
TSSOP − PW
−55°C
125°C
55 C to 125
C
†
TOP-SIDE
MARKING
Tube
SOIC − DW
−40°C
40 C to 85°C
85 C
ORDERABLE
PART NUMBER
PACKAGE†
TA
SN74AC240N
AC240
AC240
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
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.
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
FUNCTION TABLE
(each buffer)
INPUTS
OE
A
OUTPUT
Y
L
H
L
L
L
H
H
X
Z
logic diagram (positive logic)
1OE
1A1
1A2
1A3
1A4
2OE
2A1
2A2
2A3
2A4
2
1
2
18
4
16
6
14
8
12
1Y1
1Y2
1Y3
1Y4
19
11
9
13
7
15
5
17
3
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2Y1
2Y2
2Y3
2Y4
SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
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
VCC
Supply voltage
VCC = 3 V
VIH
High-level
High
level input voltage
MIN
MAX
2
6
Low-level
Low
level input voltage
MIN
MAX
2
6
2.1
2.1
VCC = 4.5 V
3.15
3.15
VCC = 5.5 V
3.85
3.85
VCC = 3 V
VIL
SN74AC240
UNIT
V
V
0.9
0.9
VCC = 4.5 V
1.35
1.35
VCC = 5.5 V
1.65
1.65
V
VI
Input voltage
0
VCC
0
VCC
V
VO
Output voltage
0
VCC
0
VCC
V
IOH
IOL
High-level
High
level output current
Low-level
Low
level output current
Δt/Δv
Input transition rise or fall rate
TA
Operating free-air temperature
VCC = 3 V
−12
−12
VCC = 4.5 V
−24
−24
VCC = 5.5 V
−24
−24
VCC = 3 V
12
12
VCC = 4.5 V
24
24
VCC = 5.5 V
24
24
8
8
ns/V
85
°C
−55
125
−40
mA
mA
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
IOH = −50
50 μA
IOH = −24
24 mA
A
MAX
SN74AC240
MIN
2.9
2.9
2.9
4.4
4.4
4.4
5.5 V
5.4
5.4
5.4
3V
2.56
2.4
2.46
4.5 V
3.86
3.7
3.76
5.5 V
4.86
4.7
4.76
MAX
5.5 V
3V
0.1
0.1
0.1
IOL = 50 μA
4.5 V
0.1
0.1
0.1
5.5 V
0.1
0.1
0.1
0.36
0.5
0.44
0.36
0.5
0.44
5.5 V
0.36
0.5
0.44
5.5 V
5.5 V
VO = VCC or GND,
VI(OE) = VIL or VIH
ICC
VI = VCC or GND,
Ci
VI = VCC or GND
IO = 0
V
1.65
1.65
±0.1
±1
±1
±0.1
±1
±1
5.5 V
±0.25
±5
±2.5
μA
5.5 V
4
80
40
μA
55V
5.5
VI = VCC or GND
IOZ‡
3.85
3V
IOL = 75 mA†
VI = VCC or GND
3.85
4.5 V
mA†
UNIT
V
5.5 V
IOL = 50
Control inputs
MIN
IOH = −75 mA†
IOL = 24 mA
II
SN54AC240
MAX
3V
IOL = 12 mA
Data inputs
TYP
mA†
IOH = −50
VOL
MIN
4.5 V
IOH = −12 mA
VOH
TA = 25°C
VCC
5V
2.5
A
μA
pF
†
Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
‡ For I/O ports, the parameter I
OZ includes the input leakage current.
switching characteristics over recommended operating
VCC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)
PARAMETER
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
4
FROM
(INPUT)
TO
(OUTPUT)
A
Y
OE
Y
OE
Y
POST OFFICE BOX 655303
free-air
TA = 25°C
temperature
SN54AC240
range,
SN74AC240
MIN
TYP
MAX
MIN
MAX
MIN
MAX
1.5
6
8
1
11
1
9
1.5
5.5
8
1
10.5
1
8.5
1.5
6
10.5
1
11.5
1
11
1.5
7
10
1
13
1
11
1.5
7
10
1
12.5
1
10.5
1.5
7.5
10.5
1
13.5
1
11.5
• DALLAS, TEXAS 75265
UNIT
ns
ns
ns
SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
switching characteristics over recommended operating
VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
A
Y
OE
Y
OE
Y
free-air
TA = 25°C
temperature
SN54AC240
range,
SN74AC240
MIN
TYP
MAX
MIN
MAX
MIN
MAX
1.5
4.5
6.5
1
8.5
1
7
1.5
4.5
6
1
8
1
6.5
1.5
5
7
1
9
1
8
1.5
5.5
8
1
10.5
1
8.5
2.5
6.5
9
1
10.5
1
9.5
2
6.5
9
1
11
1
9.5
UNIT
ns
ns
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
Cpd
TEST CONDITIONS
Power dissipation capacitance per buffer/driver
CL = 50 pF,
TYP
UNIT
45
pF
f = 1 MHz
PARAMETER MEASUREMENT INFORMATION
2 × VCC
S1
500 Ω
From Output
Under Test
CL = 50 pF
(see Note A)
Open
500 Ω
Output
Control
(low-level
enabling)
LOAD CIRCUIT
VCC
Input
50% VCC
50% VCC
0V
tPLH
tPHL
50% VCC
S1
Open
2 × VCC
Open
VCC
50% VCC
50% VCC
VOL
50% VCC
0V
tPZL
tPLZ
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
≈VCC
50% VCC
tPZH
VOH
Output
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
VOL
tPHZ
Output
Waveform 2
S1 at Open
(see Note B)
VOLTAGE WAVEFORMS
VOL + 0.3 V
50% VCC
VOH − 0.3 V
VOH
≈0 V
VOLTAGE WAVEFORMS
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
5962-87550012A
ACTIVE
LCCC
FK
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
596287550012A
SNJ54AC
240FK
5962-8755001RA
ACTIVE
CDIP
J
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-8755001RA
SNJ54AC240J
Samples
5962-8755001SA
ACTIVE
CFP
W
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-8755001SA
SNJ54AC240W
Samples
SN74AC240DBR
ACTIVE
SSOP
DB
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
AC240
Samples
SN74AC240DW
ACTIVE
SOIC
DW
20
25
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
AC240
Samples
SN74AC240DWR
ACTIVE
SOIC
DW
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
AC240
Samples
SN74AC240N
ACTIVE
PDIP
N
20
20
RoHS &
Non-Green
NIPDAU
N / A for Pkg Type
-40 to 85
SN74AC240N
Samples
SN74AC240NSR
ACTIVE
SO
NS
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
AC240
Samples
SN74AC240PW
ACTIVE
TSSOP
PW
20
70
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
AC240
Samples
SN74AC240PWR
ACTIVE
TSSOP
PW
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
AC240
Samples
SN74AC240PWRE4
ACTIVE
TSSOP
PW
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
AC240
Samples
SNJ54AC240FK
ACTIVE
LCCC
FK
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
596287550012A
SNJ54AC
240FK
SNJ54AC240J
ACTIVE
CDIP
J
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-8755001RA
SNJ54AC240J
Samples
SNJ54AC240W
ACTIVE
CFP
W
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-8755001SA
SNJ54AC240W
Samples
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
Addendum-Page 1
Samples
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of