SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A D2932, MARCH 1987 REVISED OCTOBER 1993
Copyright
1993, Texas Instruments Incorporated
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
Package Options Include Plastic
Small-Outline (SOIC) and Shrink
Small-Outline (SSOP) Packages, Ceramic
Chip Carriers, and Plastic and Ceramic
DIPs
description
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. Taken together with the
F241 and
F244, 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.
The
F240 is 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.
The SN74F240 is available in TI's shrink
small-outline package (DB), which provides the
same I/O pin count and functionality of standard
small-outline packages in less than half the
printed-circuit-board area.
The SN54F240 is characterized for operation over
the full military temperature range of 55
C to
125
C. The SN74F240 is characterized for
operation from 0
C to 70
C.
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
OE
A
Y
L
H
L
L
L
H
H
X
Z
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
SN54F240 . . . J PACKAGE
SN74F240 . . . DB, DW, OR N 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
SN54F240 . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
1Y4
2A2
2OE
2Y1
GND
2A1
V
CC
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.
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A D2932, MARCH 1987 REVISED OCTOBER 1993
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic symbol
logic diagram (positive logic)
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
1
2
4
6
8
19
11
13
15
17
3
5
7
9
12
14
16
18
1A1
1A2
1A3
1A4
1Y1
2A1
2A2
2A3
2A4
2Y1
1Y2
1Y3
1Y4
2Y2
2Y3
2Y4
1OE
2OE
2
1A1
4
1A2
6
1A3
8
1A4
EN
1
1Y1
18
1Y2
16
1Y3
14
1Y4
12
11
2A1
13
2A2
15
2A3
17
2A4
EN
19
2Y1
9
2Y2
7
2Y3
5
2Y4
3
1OE
2OE
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)
1.2 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input current range
30 mA to 5 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the disabled or power-off state
0.5 V to 5.5 V
. . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state
0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state: SN54F240
96 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F240
128 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range:
SN54F240
55
C to 125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F240
0
C to 70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
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.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A D2932, MARCH 1987 REVISED OCTOBER 1993
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
SN54F240
SN74F240
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
IIK
Input clamp current
18
18
mA
IOH
High-level output current
12
15
mA
IOL
Low-level output current
48
64
mA
TA
Operating free-air temperature
55
125
0
70
C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54F240
SN74F240
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.2
1.2
V
IOH = 3 mA
2.4
3.3
2.4
3.3
VOH
VCC = 4.5 V
IOH = 12 mA
2
3.2
V
VOH
IOH = 15 mA
2
3.1
V
VCC = 4.75 V,
IOH = 3 mA
2.7
VOL
VCC = 4 5 V
IOL = 48 mA
0.38
0.55
V
VOL
VCC = 4.5 V
IOL = 64 mA
0.42
0.55
V
IOZH
VCC = 5.5 V,
VO = 2.7 V
50
50
A
IOZL
VCC = 5.5 V,
VO = 0.5 V
50
50
A
II
VCC = 5.5 V,
VI = 7 V
0.1
0.1
mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
20
A
IIL
VCC = 5.5 V,
VI = 0.5 V
1
1
mA
IOS
VCC = 5.5 V,
VO = 0
100
225
100
225
mA
Outputs high
19
29
19
29
ICC
VCC = 5.5 V
Outputs low
50
75
50
75
mA
Outputs disabled
42
63
42
63
All typical values are at VCC = 5 V, TA = 25
C.
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A D2932, MARCH 1987 REVISED OCTOBER 1993
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Note 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500
,
TA = 25
C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
,
TA = MIN to MAX
UNIT
(INPUT)
(OUTPUT)
F240
SN54F240
SN74F240
MIN
TYP
MAX
MIN
MAX
MIN
MAX
tPLH
Any A
Y
2.2
4.7
7
2.2
9
2.2
8
ns
tPHL
Any A
Y
1.2
3.1
4.7
1.2
6
1.2
5.7
ns
tPZH
OE
Y
1.2
3.1
5.3
1.2
6.7
1.2
6.1
ns
tPZL
OE
Y
3.2
6.5
9
3.2
10.5
3.2
10
ns
tPHZ
OE
Y
1.2
3.6
5.3
1.2
6.5
1.2
6.3
ns
tPLZ
OE
Y
1.2
5.6
8
1.2
12.5
1.2
9.5
ns
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and waveforms are shown in Section 1.
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Copyright
1998, Texas Instruments Incorporated
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