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SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004F – OCTOBER 1987 – REVISED MARCH 2003
D
D
Operating Voltage Range of 4.5 V to 5.5 V
State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
SN54BCT240 . . . J OR W PACKAGE
SN74BCT240 . . . DB, DW, N, OR NS PACKAGE
(TOP VIEW)
D
D
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
SN54BCT240 . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
V
CC
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
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
description/ordering information
These octal buffers and line drivers are designed specifically to improve both the performance and density of
3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. Together with the
’BCT241 and ’BCT244 devices, these devices provide the choice of selected combinations of inverting and
noninverting outputs, symmetrical OE (active-low output-enable) inputs, and complementary OE and OE
inputs. These devices feature high fan-out and improved fan-in.
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
TA
PDIP – N
0°C to 70°C
SOIC – DW
SOP – NS
SSOP – DB
CDIP – J
–55°C to 125°C
CFP – W
LCCC – FK
PACKAGE†
Tube
Tube
Tape and reel
Tape and reel
Tape and reel
Tube
Tube
Tube
ORDERABLE
PART NUMBER
SN74BCT240N
SN74BCT240DW
SN74BCT240DWR
SN74BCT240NSR
SN74BCT240DBR
SNJ54BCT240J
SNJ54BCT240W
SNJ54BCT240FK
TOP-SIDE
MARKING
SN74BCT240N
BCT240
BCT240
BT240
SNJ54BCT240J
SNJ54BCT240W
SNJ54BCT240FK
† 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
•
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2Y1
GND
2A1
1Y4
2A2
1
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004F – OCTOBER 1987 – REVISED MARCH 2003
FUNCTION TABLE
(each buffer)
INPUTS
OE
L
L
H
A
H
L
X
OUTPUT
Y
L
H
Z
logic diagram (positive logic)
1
1OE
2
1A1
4
1A2
6
1A3
8
1A4
18
1Y1
16
1Y2
14
1Y3
12
1Y4
19
2OE
11
2A1
13
9
2Y1
2A2
7
2Y2
15
2A3
17
2A4
5
2Y3
3
2Y4
2
POST OFFICE BOX 655303
•
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SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004F – OCTOBER 1987 – REVISED MARCH 2003
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
Input voltage range, V
I
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
Voltage range applied to any output in the disabled or power-off state, V
O
. . . . . . . . . . . . . . . . –0.5 V to 5.5 V
Voltage range applied to any output in the high state, V
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
CC
Input clamp current, I
IK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA
Current into any output in the low state: SN54BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA
SN74BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Package thermal impedance,
θ
JA
(see Note 2): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W
NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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)
SN54BCT240
MIN
VCC
VIH
VIL
IIK
IOH
IOL
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
4.5
2
0.8
–18
–12
48
NOM
5
MAX
5.5
SN74BCT240
MIN
4.5
2
0.8
–18
–15
64
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
mA
TA
Operating free-air temperature
–55
125
0
70
°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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004F – OCTOBER 1987 – REVISED MARCH 2003
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VCC = 4.5 V,
VCC = 4.5 V
TEST CONDITIONS
II = –18 mA
IOH = –3 mA
IOH = –12 mA
IOH = –15 mA
IOL = 48 mA
IOL = 64 mA
VI = 7 V
VI = 2.7 V
VI = 0.5 V
VO = 2.7 V
VO = 0.5 V
VO = 0
Outputs open
Outputs open
Outputs open
VI = 2.5 V or 0.5 V
VO = 2.5 V or 0.5 V
–100
19
46
6
6
SN54BCT240
MIN TYP†
MAX
–1.2
2.4
2
3.3
3.2
2
0.38
0.55
0.42
0.1
20
–1
50
–50
–225
31
71
9
–100
19
46
6
6
11
0.55
0.1
20
–1
50
–50
–225
31
71
9
3.1
V
mA
µA
mA
µA
µA
mA
mA
mA
mA
pF
pF
2.4
3.3
V
SN74BCT240
MIN TYP†
MAX
–1.2
UNIT
V
VOL
II
IIH
IIL
IOZH
IOZL
IOS‡
ICCH
ICCL
ICCZ
Ci
Co
VCC = 4 5 V
4.5
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5 V,
VCC = 5 V,
11
† All typical values are at VCC = 5 V.
‡ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
switching characteristics (see Figure 1)
VCC = 5 V,
CL = 50 pF,
R1 = 500
Ω,
R2 = 500
Ω,
TA = 25°C
’BCT240
MIN
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
A
Y
Y
Y
0.5
0.4
1
1
1
1
TYP
3.3
1.8
6.4
7.5
6
6.7
MAX
4.8
3.5
7.9
9.4
6.8
8.1
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
Ω,
R2 = 500
Ω,
TA = MIN to MAX§
SN54BCT240 SN74BCT240
MIN
0.5
0.4
1
1
1
1
MAX
6.4
4.5
9.2
10.8
8.5
10.6
MIN
0.5
0.4
1
1
1
1
MAX
5.6
4
8.8
10.5
8.1
9.5
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
OE
OE
§ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
4
POST OFFICE BOX 655303
•
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