TI SN74F251BD

SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS066A – MARCH 1987 – REVISED OCTOBER 1993
•
•
•
•
•
SN54F251B . . . J PACKAGE
SN74F251B . . . D OR N PACKAGE
(TOP VIEW)
3-State Versions of SN54F151B and
SN74F151B
3-State Outputs Interface Directly With
System Bus
Performs Parallel-to-Serial Conversion
Complementary Outputs Provide True and
Inverted Data
Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
D3
D2
D1
D0
Y
W
G
GND
description
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
D4
D5
D6
D7
A
B
C
SN54F251B . . . FK PACKAGE
(TOP VIEW)
D2
D3
NC
VCC
D4
These data selectors/multiplexers contain full
binary decoding to select one of eight data
sources
and
feature
strobe-controlled
complementary outputs. The 3-state outputs can
interface with and drive data lines of busorganized systems. When the strobe (G) input is
high, both outputs are in a high-impedance state
in which both the upper and lower transistors of
each totem-pole output are off, and the output
neither drives nor loads the bus significantly.
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
D5
D6
NC
D7
A
G
GND
NC
C
B
D1
D0
NC
Y
W
The SN54F251B is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The SN74F251B is characterized for
operation from 0°C to 70°C.
NC – No internal connection
FUNCTION TABLE
INPUTS
SELECT
OUTPUTS
C
B
A
STROBE
G
X
X
X
H
Z
Z
L
L
L
L
D0
D0
L
L
H
L
D1
D1
L
H
L
L
D2
D2
Y
W
L
H
H
L
D3
D3
H
L
L
L
D4
D4
H
L
H
L
D5
D5
H
H
L
L
D6
D6
H
H
H
L
D7
D7
D0, D1, . . . D7 = the level of the respective D input.
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
SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS066A – MARCH 1987 – REVISED OCTOBER 1993
logic symbol†
G
A
B
C
D0
D1
D2
D3
D4
D5
D6
D7
7
11
MUX
EN
0
10
9
4
3
2
1
15
14
13
12
0
G7
2
0
5
1
6
2
3
4
5
6
7
† 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.
2–2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
Y
W
SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS066A – MARCH 1987 – REVISED OCTOBER 1993
logic diagram (positive logic)
G
D0
D1
D2
D3
4
3
2
1
5
Data
Inputs
D4
D5
D6
D7
A
Data
Select
(Binary)
7
B
C
6
15
Y
W
14
13
12
11
10
9
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: SN54F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA
SN74F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA
Operating free-air temperature range: SN54F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–3
SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS066A – MARCH 1987 – REVISED OCTOBER 1993
recommended operating conditions
SN54F251B
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
SN74F251B
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
SN54F251B
TYP†
MAX
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4
4.5
5V
VCC = 4.75 V,
MIN
II = – 18 mA
IOH = – 1 mA
SN74F251B
TYP†
MAX
MIN
– 1.2
IOH = – 3 mA
IOH = – 1 mA to – 3 mA
– 1.2
2.5
3.4
2.5
3.4
2.4
3.3
2.4
3.3
2.7
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
ICC
VCC = 5.5 V,
See Note 2
Condition A
15
22
15
22
Condition B
16
24
16
24
POST OFFICE BOX 655303
V
V
IOL = 20 mA
IOL = 24 mA
0.3
0.5
0.35
• DALLAS, TEXAS 75265
V
50
50
µA
– 50
µA
0.1
0.1
mA
20
20
µA
– 0.6
mA
–150
mA
– 0.6
– 60
0.5
– 50
–150
– 60
† 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. Select input and data input at 4.5 V, output control grounded
B. All inputs at 4.5 V
2–4
UNIT
mA
SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS066A – 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 †
′F251B
tPLH
tPHL
A B,
B or C
A,
W
tPLH
tPHL
A B,
A,
B or C
Y
tPLH
tPHL
Any D
W
tPLH
tPHL
Any D
Y
tPZH
tPZL
G
W
tPHZ
tPLZ
G
W
tPZH
tPZL
G
Y
tPHZ
tPLZ
G
Y
SN54F251B
UNIT
SN74F251B
MIN
TYP
MAX
MIN
MAX
MIN
MAX
3.5
5.4
9
3.5
11.5
3.5
9.5
2.5
4.4
7.5
2.5
8
2.5
7.5
4.5
6.2
10.5
3.5
14
4
12.5
4
6
8.5
3
10.9
3.5
9
2.5
3.7
6.5
1.8
8
2
7
1
1.9
4
1
6
1
5
3
3.8
7
2.3
9
2.3
8
3
4.5
7
2.3
9
2.5
8
2.5
3.6
6
2
7
2
7
2.5
3.8
6
2.5
7.5
2.5
6.5
1.9
2.5
5.5
1.4
6
1.5
6
1
2.4
4.5
1
5
1
4.5
3.4
4.8
7
2.7
8.5
2.9
8.5
2.9
4
7.5
2.6
9
2.6
8
1.9
2.5
5.5
1.7
5.5
1.8
5.5
1
2.3
4.5
1
5.5
1
4.5
ns
ns
ns
ns
ns
ns
ns
ns
† 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–5
SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS066A – MARCH 1987 – REVISED OCTOBER 1993
2–6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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