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
Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
A /B
1A
1B
1Y
2A
2B
2Y
GND
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.
X
X
Z
L
X
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
A /B
A
H
X
L
L
L
3
14
4
13
5
12
6
11
7
10
8
9
VCC
OE
4A
4B
4Y
3A
3B
3Y
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
4A
4B
NC
4Y
3A
2Y
GND
NC
3Y
3B
B
OE
15
1A
A/B
NC
VCC
OE
1B
1Y
NC
2A
2B
FUNCTION TABLE
OUTPUT
Y
16
2
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.
INPUTS
1
NC − No internal connection
logic symbol†
15
OE
1
A /B
1A
1B
2A
2B
3A
3B
4A
4B
EN
G1
2
3
1
MUX
4
1
1Y
5
7
6
2Y
11
9
10
3Y
14
12
13
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.
Copyright 1993, Texas Instruments Incorporated
!"#$%&" ' ()##*& %' "! +),-(%&" .%&*/
#".)(&' ("!"#$ &" '+*(!(%&"' +*# &0* &*#$' "! *1%' ')$*&'
'&%.%#. 2%##%&3/ #".)(&" +#"(*''4 ."*' "& *(*''%#-3 (-).*
&*'&4 "! %-- +%#%$*&*#'/
• DALLAS, TEXAS 75265
• HOUSTON, TEXAS 77251−1443
POST OFFICE BOX 655303
POST OFFICE BOX 1443
2−1
SDFS065A − D2932, MARCH 1987 − REVISED OCTOBER 1993
logic diagram (positive logic)
OE
A/B
1A
1B
2A
15
1
2
4
3
5
7
2B
3A
3B
4A
4B
1Y
2Y
6
11
9
3Y
10
14
12
4Y
13
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, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
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 VCC
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
•
SDFS065A − D2932, MARCH 1987 − REVISED OCTOBER 1993
recommended operating conditions
SN54F257
SN74F257
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
0.8
0.8
V
Input clamp current
−18
−18
mA
IOH
IOL
High-level output current
−3
−3
mA
24
mA
TA
Operating free-air temperature
70
°C
High-level input voltage
2
2
Low-level output current
V
20
−55
125
V
0
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VCC = 4.5 V,
VCC = 4.5 V
VCC = 4.75 V,
MIN
II = − 18 mA
IOH = − 1 mA
VCC = 4.5 V
IOL = 20 mA
IOL = 24 mA
IOZH
IOZL
VCC = 5.5 V,
VCC = 5.5 V,
VO = 2.7 V
VO = 0.5 V
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
VI = 7 V
VI = 2.7 V
IIL
IOS‡
VCC = 5.5 V,
VCC = 5.5 V,
VI = 0.5 V
VO = 0
SN74F257
TYP†
MAX
MIN
−1.2
IOH = − 3 mA
IOH = − 1 mA to − 3 mA
VOL
ICCH
ICCL
SN54F257
TYP†
MAX
TEST CONDITIONS
−1.2
2.5
3.4
2.5
3.4
2.4
3.3
2.4
3.3
0.3
V
0.5
0.35
0.5
50
50
µA
−50
µA
0.1
0.1
mA
20
20
µA
− 0.6
mA
−150
mA
−150
−60
9
15
9
15
Condition B
14.5
22
14.5
22
ICCZ
Condition C
15
23
15
† 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.
NOTE 2: ICC is measured with the outputs open under the following conditions:
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
23
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
V
−50
− 0.6
−60
•
V
2.7
Condition A
VCC = 5.5 V,
See Note 2
UNIT
mA
2−3
SDFS065A − D2932, MARCH 1987 − REVISED OCTOBER 1993
switching characteristics (see Note 3)
PARAMETER
FROM
(INPUT)
VCC = 5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = 25°C
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX†
′F257
tPLH
tPHL
A or B
Any Y
tPLH
tPHL
A/B
Any Y
tPZH
tPZL
G
Any Y
tPHZ
tPLZ
G
Any Y
SN54F257
SN74F257
MAX
MIN
MAX
MIN
4.1
6
2.2
8
2.2
7
3.8
5.5
1
8
1.2
6.5
9.7
13
3.7
15.5
3.7
15
6.1
8.5
2.7
10.5
2.7
9.5
2.2
5.5
7.5
2.2
9.5
2.2
8.5
2.2
5.1
7.5
2.2
10
2.2
8.5
1.2
3.9
6
1.2
7
1.2
7
1.2
4.1
6
1.2
9.5
1.2
7
MIN
TYP
2.2
1.2
3.7
2.7
† 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
•
UNIT
MAX
ns
ns
ns
ns
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Jun-2022
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
K0
P1
B0 W
Reel
Diameter
Cavity
A0
B0
K0
W
P1
A0
Dimension designed to accommodate the component width
Dimension designed to accommodate the component length
Dimension designed to accommodate the component thickness
Overall width of the carrier tape
Pitch between successive cavity centers
Reel Width (W1)
QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE
Sprocket Holes
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
User Direction of Feed
Pocket Quadrants
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
SN74F257DR
SOIC
D
16
2500
330.0
16.4
6.5
10.3
2.1
8.0
16.0
Q1
SN74F257NSR
SO
NS
16
2000
330.0
16.4
8.2
10.5
2.5
12.0
16.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Jun-2022
TAPE AND REEL BOX DIMENSIONS
Width (mm)
W
L
H
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
SN74F257DR
SN74F257NSR
SOIC
D
16
2500
340.5
336.1
32.0
SO
NS
16
2000
356.0
356.0
35.0
Pack Materials-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Jun-2022
TUBE
T - Tube
height
L - Tube length
W - Tube
width
B - Alignment groove width
*All dimensions are nominal
Device
Package Name
Package Type
Pins
SPQ
L (mm)
SN74F257D
D
SOIC
16
40
507
SN74F257N
N
PDIP
16
25
506
SN74F257N
N
PDIP
16
25
506
13.97
Pack Materials-Page 3
W (mm)
T (µm)
B (mm)
8
3940
4.32
13.97
11230
4.32
11230
4.32
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