SN74F257DR [TI]
QUADRUPLE 2-LINE TO 1-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS;
| 型号： | SN74F257DR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | QUADRUPLE 2-LINE TO 1-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS 光电二极管 输出元件 逻辑集成电路 |
| 文件： | 总5页 (文件大小：86K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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ꢉ ꢊꢋꢌ ꢍꢊꢎ ꢏꢐ ꢈꢅ ꢑꢏ ꢒꢁꢐ ꢈꢓꢔ ꢈꢕ ꢑꢏ ꢒꢁ ꢐꢈꢌꢋꢓꢋꢈꢀ ꢐꢏ ꢐꢖꢓꢔ ꢍꢀꢗ ꢘꢊ ꢏꢓ ꢒꢎ ꢏꢐ ꢙꢐ ꢍ
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SDFS065A − D2932, MARCH 1987 − REVISED OCTOBER 1993
SN54F257 . . . J PACKAGE
SN74F257 . . . D OR N PACKAGE
(TOP VIEW)
• 3-State Outputs Interface Directly With
System Bus
• Provides Bus Interface From Multiple
Sources in High-Performance Systems
V
A/B
1A
1B
1Y
2A
2B
2Y
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CC
• Package Options Include Plastic
OE
4A
4B
4Y
3A
3B
3Y
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
The ′F257 is designed to multiplex signals from
4-bit data sources to 4-output data lines in
bus-organized systems. The 3-state outputs will
not load the data lines when the output enable
(OE) input is at a high logic level.
SN54F257 . . . FK PACKAGE
(TOP VIEW)
The SN54F257 is characterized for operation over
the full military temperature range of −55°C to
125°C. The SN74F257 is characterized for
operation from 0°C to 70°C.
3
2
1
20 19
18
4A
4B
NC
4Y
3A
1B
1Y
NC
2A
2B
4
5
6
7
8
17
16
15
14
FUNCTION TABLE
INPUTS
OUTPUT
9 10 11 12 13
Y
Z
L
OE
H
L
A/B
X
A
X
L
B
X
X
X
L
L
L
L
H
X
X
H
L
NC − No internal connection
L
H
L
H
H
H
†
logic symbol
15
1
EN
G1
OE
A/B
2
1A
1B
2A
2B
3A
3B
4A
4B
MUX
4
1
1
3
1Y
5
7
6
2Y
11
10
14
13
9
3Y
12
4Y
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
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Copyright 1993, Texas Instruments Incorporated
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2−1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀꢁ ꢂ ꢃꢄ ꢅ ꢂ ꢆ ꢇ ꢈ ꢀ ꢁꢆ ꢃꢄ ꢅꢂ ꢆ
ꢉꢊ ꢋ ꢌꢍ ꢊ ꢎꢏꢐ ꢈ ꢅ ꢑꢏꢒ ꢁ ꢐ ꢈꢓꢔ ꢈꢕ ꢑꢏ ꢒ ꢁꢐ ꢈꢌ ꢋꢓꢋꢈꢀ ꢐꢏ ꢐꢖꢓꢔ ꢍꢀꢗ ꢘꢊ ꢏꢓ ꢒꢎ ꢏꢐ ꢙꢐꢍꢀ
ꢚꢒ ꢓ ꢛ ꢈꢜ ꢑꢀ ꢓꢋꢓꢐ ꢈ ꢔ ꢊꢓ ꢎꢊꢓ ꢀ
SDFS065A − D2932, MARCH 1987 − REVISED OCTOBER 1993
logic diagram (positive logic)
15
OE
1
A/B
2
1A
4
7
1Y
2Y
3
1B
5
2A
6
2B
11
3A
9
3Y
4Y
10
3B
14
4A
12
13
4B
Pin numbers shown are for the D, J, and N packages.
†
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 (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: SN54F257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA
SN74F257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA
Operating free-air temperature range: SN54F257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
SN74F257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
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ꢚ ꢒꢓ ꢛꢈ ꢜ ꢑꢀꢓꢋꢓ ꢐꢈ ꢔ ꢊꢓ ꢎꢊ ꢓ
SDFS065A − D2932, MARCH 1987 − REVISED OCTOBER 1993
recommended operating conditions
SN54F257
SN74F257
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
− 3
0.8
−18
− 3
24
V
I
I
I
mA
mA
mA
°C
IK
High-level output current
Low-level output current
Operating free-air temperature
OH
OL
20
T
A
−55
125
0
70
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54F257
SN74F257
PARAMETER
TEST CONDITIONS
I = −18 mA
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
IK
V
CC
= 4.5 V,
−1.2
−1.2
V
I
I
I
I
I
I
= − 1 mA
= − 3 mA
= − 1 mA to −3 mA
= 20 mA
2.5
2.4
3.4
3.3
2.5
2.4
2.7
3.4
3.3
OH
OH
OH
OL
OL
V
= 4.5 V
CC
CC
V
V
OH
V
= 4.75 V,
0.3
0.5
V
OL
V
CC
= 4.5 V
V
= 24 mA
0.35
0.5
50
I
I
I
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
= 2.7 V
50
−50
0.1
µA
µA
OZH
OZL
I
O
O
V
= 0.5 V
−50
0.1
V = 7 V
mA
µA
I
V = 2.7 V
20
20
IH
I
V = 0.5 V
− 0.6
−150
15
− 0.6
−150
15
mA
mA
IL
I
‡
V
= 0
−60
−60
OS
O
Condition A
Condition B
Condition C
9
14.5
15
9
14.5
15
CCH
CCL
CCZ
V
CC
= 5.5 V,
22
22
mA
See Note 2
23
23
†
‡
All typical values are at V
CC
= 5 V, T = 25°C.
A
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
is measured with the outputs open under the following conditions:
NOTE 2: I
CC
A. A/B and all B inputs at 4.5 V, other inputs grounded
B. All B inputs at 4.5 V, other inputs grounded
C. OE and all B data inputs at 4.5 V, other inputs grounded
2−3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀꢁ ꢂ ꢃꢄ ꢅ ꢂ ꢆ ꢇ ꢈ ꢀ ꢁꢆ ꢃꢄ ꢅꢂ ꢆ
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SDFS065A − D2932, MARCH 1987 − REVISED OCTOBER 1993
switching characteristics (see Note 3)
V
C
= 5 V,
= 50 pF,
V
= 4.5 V to 5.5 V,
C = 50 pF,
L
CC
L
CC
R1 = 500 Ω,
R2 = 500 Ω,
R1 = 500Ω,
R2 = 500 Ω,
T = MIN to MAX
A
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
†
T
A
= 25°C
′F257
TYP
4.1
SN54F257
SN74F257
MIN
2.2
1.2
3.7
2.7
2.2
2.2
1.2
1.2
MAX
6
MIN
2.2
1
MAX
MIN
2.2
1.2
3.7
2.7
2.2
2.2
1.2
1.2
MAX
t
t
t
t
8
8
7
6.5
15
9.5
8.5
8.5
7
PLH
PHL
PLH
PHL
PZH
A or B
A/B
G
Any Y
Any Y
Any Y
Any Y
ns
ns
ns
ns
3.8
5.5
13
8.5
7.5
7.5
6
9.7
3.7
2.7
2.2
2.2
1.2
1.2
15.5
10.5
9.5
10
6.1
t
5.5
t
5.1
PZL
PHZ
t
3.9
7
G
t
4.1
6
9.5
7
PLZ
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 3: Load circuits and waveforms are shown in Section 1.
2−4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
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