TI SN74F257N

SN54F257, SN74F257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
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.
A /B
A
B
H
X
X
X
Z
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
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
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
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
• DALLAS, TEXAS 75265
2–1
SN54F257, SN74F257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS065A – D2932, MARCH 1987 – REVISED OCTOBER 1993
logic diagram (positive logic)
OE
A/B
1A
1B
2A
15
1
2
4
5
7
2B
3A
3B
4A
4B
1Y
3
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
SN54F257, SN74F257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS065A – D2932, MARCH 1987 – REVISED OCTOBER 1993
recommended operating conditions
SN54F257
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
IOH
IOL
High-level output current
TA
Operating free-air temperature
High-level input voltage
SN74F257
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
2
2
Input clamp current
Low-level output current
V
V
0.8
0.8
V
– 18
– 18
mA
–3
–3
mA
24
mA
70
°C
20
– 55
UNIT
125
0
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VCC = 4.5 V,
VCC = 4
4.5
5V
VCC = 4.75 V,
MIN
II = – 18 mA
IOH = – 1 mA
VOL
5V
VCC = 4
4.5
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
IOL = 20 mA
IOL = 24 mA
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
2.7
0.3
0.5
0.35
50
50
µA
– 50
µA
0.1
0.1
mA
20
20
µA
– 0.6
mA
–150
mA
–150
– 60
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
• DALLAS, TEXAS 75265
V
– 50
– 0.6
– 60
0.5
9
POST OFFICE BOX 655303
V
V
Condition A
VCC = 5.5
55V
V,
See Note 2
UNIT
mA
2–3
SN54F257, SN74F257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS065A – D2932, MARCH 1987 – REVISED OCTOBER 1993
switching characteristics (see Note 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = 25°C
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
MIN
TYP
MAX
MIN
MAX
MIN
MAX
2.2
4.1
6
2.2
8
2.2
7
1.2
3.8
5.5
1
8
1.2
6.5
3.7
9.7
13
3.7
15.5
3.7
15
2.7
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
† 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
UNIT
• DALLAS, TEXAS 75265
ns
ns
ns
ns
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Copyright  1998, Texas Instruments Incorporated