SN54F240 [TI]
OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS; 八路缓冲器/驱动器,具有三态输出型号: | SN54F240 |
厂家: | TEXAS INSTRUMENTS |
描述: | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
文件: | 总5页 (文件大小:75K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993
SN54F240 . . . J PACKAGE
SN74F240 . . . DB, DW, OR N PACKAGE
(TOP VIEW)
• 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
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
2OE
1Y1
2A4
1Y2
2A3
1Y3
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.
13 2A2
12 1Y4
11
2A1
SN54F240 . . . FK PACKAGE
(TOP VIEW)
3
2
1
20 19
18
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
4
5
6
7
8
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.
17
16
15
14
9 10 11 12 13
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
Y
OE
A
H
L
L
L
L
H
Z
H
X
Copyright 1993, 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.
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993
†
logic symbol
logic diagram (positive logic)
1
1
1OE
EN
1OE
18
2
2
4
6
8
18
16
14
12
1Y1
1Y2
1Y3
1A1
1A2
1A3
1A4
1Y1
1Y2
1Y3
1Y4
1A1
16
14
4
1A2
6
1A3
19
2OE
EN
12
8
1Y4
1A4
11
13
15
17
9
7
5
3
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
19
2OE
9
7
11
2Y1
2Y2
†
2A1
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
13
2A2
5
3
15
2Y3
2Y4
2A3
17
2A4
‡
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –1.2 V to 7 V
I
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.
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993
recommended operating conditions
SN54F240
SN74F240
UNIT
MIN NOM
MAX
MIN NOM
MAX
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
IH
IL
High-level input voltage
Low-level input voltage
Input clamp current
0.8
–18
– 12
48
0.8
–18
– 15
64
V
I
I
I
mA
mA
mA
°C
IK
High-level output current
Low-level output current
Operating free-air temperature
OH
OL
T
A
–55
125
0
70
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54F240
SN74F240
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
= 4.5 V,
= 4.5 V
I = –18 mA
–1.2
–1.2
V
IK
CC
I
I
I
I
I
I
I
= – 3 mA
= – 12 mA
= – 15 mA
= – 3 mA
= 48 mA
= 64 mA
= 2.7 V
2.4
2
3.3
3.2
2.4
3.3
3.1
OH
OH
OH
OH
OL
OL
CC
V
OH
V
2
V
V
= 4.75 V,
= 4.5 V
2.7
CC
0.38
0.55
V
OL
V
CC
0.42
0.55
50
I
I
I
I
I
I
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
V
50
–50
0.1
20
µA
µA
OZH
OZL
I
O
O
V
= 0.5 V
–50
0.1
20
V = 7 V
I
mA
µA
V = 2.7 V
I
IH
V = 0.5 V
I
– 1
– 1
–225
29
mA
mA
IL
‡
V
O
= 0
–100
–225 –100
OS
Outputs high
Outputs low
19
50
42
29
75
63
19
50
42
I
V
CC
= 5.5 V
75
mA
CC
Outputs disabled
63
†
‡
All typical values are at V
= 5 V, T = 25°C.
A
CC
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993
switching characteristics (see Note 2)
V
C
R
= 5 V,
= 50 pF,
= 500 Ω,
= 25°C
V
C
R
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
L
CC
L
L
= 500Ω,
FROM
(INPUT)
TO
(OUTPUT)
†
PARAMETER
UNIT
T
A
T
A
= MIN to MAX
′F240
TYP
4.7
SN54F240
SN74F240
MIN
2.2
1.2
1.2
3.2
1.2
1.2
MAX
7
MIN
2.2
1.2
1.2
3.2
1.2
1.2
MAX
MIN
2.2
1.2
1.2
3.2
1.2
1.2
MAX
t
t
9
6
8
5.7
6.1
10
PLH
PHL
PZH
Any A
ns
ns
ns
Y
Y
Y
3.1
4.7
5.3
9
t
3.1
6.7
10.5
6.5
12.5
OE
OE
t
6.5
PZL
t
3.6
5.3
8
6.3
9.5
PHZ
t
5.6
PLZ
†
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.
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
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Copyright 1998, Texas Instruments Incorporated
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