Texas Instruments SN54HC251J, SN74HC251D, SN74HC251DBR, SN74HC251DR, SN74HC251N Datasheet
...
SN54HC251, SN74HC251
DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS132C – DECEMBER 1982 – REVISED FEBRUARY 1999
D
3-State Version of ’HC151
D
High-Current 3-State Outputs Interface
Directly With System Bus or Can Drive up
to 15 LSTTL Loads
D
Perform Parallel-to-Serial Conversion
D
Complementary Outputs Provide True and
Inverted Data
D
Package Options Include Plastic
Small-Outline (D), Shrink Small-Outline
(DB), and Ceramic Flat (W) Packages,
Ceramic Chip Carriers (FK), and Standard
Plastic (N) and Ceramic (J) DIPs
description
These data selectors/multiplexers contain full
binary decoding to select 1-of-8 data sources and
feature strobe-controlled complementary 3-state
outputs.
The 3-state outputs can interface with and drive
data lines of bus-organized systems. With all but
one of the common outputs disabled (in the
high-impedance state), the low impedance of the
single enabled output drives the bus line to a high
or low logic level. Both outputs are controlled by
the output-enable (OE
disabled when OE
The SN54HC251 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HC251 is characterized for
operation from –40°C to 85 °C.
) input. The outputs are
is high.
SN54HC251 ...J OR W PACKAGE
SN74HC251 . . . D, DB, OR N PACKAGE
SN54HC251 . . . FK PACKAGE
D1
D0
NC
Y
W
NC – No internal connection
(TOP VIEW)
D3
1
D2
2
D1
3
D0
4
Y
5
W
6
OE
7
GND
8
(TOP VIEW)
D2D3NC
3212019
4
5
6
7
8
910111213
OE
GND
NC
16
15
14
13
12
11
10
9
V
C
CC
V
D4
D5
D6
D7
A
B
C
D4
18
17
16
15
14
B
CC
D5
D6
NC
D7
A
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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
Copyright 1999, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
1
SN54HC251, SN74HC251
OE
Y
W
DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS132C – DECEMBER 1982 – REVISED FEBRUARY 1999
C B A
X X X H Z Z
L LLLD0 D0
L LHLD1 D1
L HLLD2 D2
L HHLD3 D3
H LLLD4 D4
H LHLD5 D5
H HLLD6 D6
H H H L D7 D7
D0, D1 . . . D7 = the level of the respective D input
FUNCTION TABLE
INPUTS
SELECT
OUTPUTS
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, DB, J, N, and W packages.
†
OE
D0
D1
D2
D3
D4
D5
D6
D7
7
11
A
10
B
9
C
4
3
2
1
15
14
13
12
EN
0
2
0
1
2
3
4
5
6
7
MUX
G
0
7
5
Y
6
W
2
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logic diagram (positive logic)
7
OE
11
A
10
B
9
C
4
D0
3
D1
SN54HC251, SN74HC251
DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS132C – DECEMBER 1982 – REVISED FEBRUARY 1999
TG
TG
2
D2
1
D3
15
D4
14
D5
13
D6
12
D7
Pin numbers shown are for the D, DB, J, N, and W packages.
TG
TG
TG
TG
TG
TG
5
Y
6
W
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3
SN54HC251, SN74HC251
UNIT
DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS132C – DECEMBER 1982 – REVISED FEBRUARY 1999
absolute maximum ratings over operating free-air temperature range
Supply voltage range, V
Input clamp current, I
Output clamp current, I
Continuous output current, I
Continuous current through V
Package thermal impedance, θ
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IK
(VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OK
(VO = 0 to VCC) ±35 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
or GND ±70 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(see Note 2): D package 113°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JA
†
DB package 131°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 78°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
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.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions (see Note 3)
SN54HC251 SN74HC251
MIN NOM MAX MIN NOM MAX
V
V
V
V
V
t
t
T
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Supply voltage 2 5 6 2 5 6 V
CC
VCC = 2 V 1.5 1.5
High-level input voltage
IH
Low-level input voltage
IL
Input voltage 0 V
I
Output voltage 0 V
O
Input transition (rise and fall) time
Operating free-air temperature –55 125 –40 85 °C
A
Implications of Slow or Floating CMOS Inputs
VCC = 4.5 V 3.15 3.15
VCC = 6 V 4.2 4.2
VCC = 2 V 0 0.5 0 0.5
VCC = 4.5 V
VCC = 6 V 0 1.8 0 1.8
VCC = 2 V 0 1000 0 1000
VCC = 4.5 V 0 500 0 500
VCC = 6 V 0 400 0 400
, literature number SCBA004.
0 1.35 0 1.35
CC
CC
0 V
0 V
CC
CC
V
V
V
V
ns
4
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PARAMETER
TEST CONDITIONS
V
UNIT
PARAMETER
V
UNIT
t
ns
SN54HC251, SN74HC251
DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS132C – DECEMBER 1982 – REVISED FEBRUARY 1999
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
TA = 25°C SN54HC251 SN74HC251
MIN TYP MAX MIN MAX MIN MAX
V
V
V
V
I
I
I
C
OH
OL
I
OZ
CC
i
CC
2 V 1.9 1.998 1.9 1.9
IOH = –20 µA
VI = VIH or V
VI = VIH or V
VI = VCC or 0 6 V ±0.1 ±100 ±1000 ±1000 nA
VO = VCC or 0, VI = VIH or V
VI = VCC or 0, IO = 0 6 V 8 160 80 µA
IL
IOH = –6 mA 4.5 V 3.98 4.3 3.7 3.84
IOH = –7.8 mA 6 V 5.48 5.8 5.2 5.34
IOL = 20 µA
IL
IOL = 6 mA 4.5 V 0.17 0.26 0.4 0.33
IOL = 7.8 mA 6 V 0.15 0.26 0.4 0.33
IL
4.5 V 4.4 4.499 4.4 4.4
6 V 5.9 5.999 5.9 5.9
2 V 0.002 0.1 0.1 0.1
4.5 V 0.001 0.1 0.1 0.1
6 V 0.001 0.1 0.1 0.1
6 V ±0.01 ±0.5 ±10 ±5 µA
2 V to 6 V 3 10 10 10 pF
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
FROM TO
(INPUT) (OUTPUT)
A, B, or C W or Y
pd
Any D W or Y
t
en
t
dis
t
t
OE
OE
W or Y
W or Y
W or Y
CC
2 V 58 205 300 256
4.5 V 21 41 60 51
6 V 19 35 51 44
2 V 44 195 283 244
4.5 V 17 39 57 49
6 V 15 33 48 41
2 V 30 145 210 181
4.5 V 10 29 42 36
6 V 9 25 36 31
2 V 25 195 283 244
4.5 V 15 39 57 49
6 V 14 33 48 41
2 V 20 75 110 95
4.5 V 8 15 22 19
6 V 6 13 19 16
TA = 25°C SN54HC251 SN74HC251
MIN TYP MAX MIN MAX MIN MAX
ns
ns
ns
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5
SN54HC251, SN74HC251
PARAMETER
V
UNIT
t
ns
DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS132C – DECEMBER 1982 – REVISED FEBRUARY 1999
switching characteristics over recommended operating free-air temperature range, CL = 150 pF
(unless otherwise noted) (see Figure 1)
FROM TO
(INPUT) (OUTPUT)
A, B, or C W or Y
pd
Any D W or Y
t
en
t
t
OE
W or Y
W or Y
operating characteristics, TA = 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
Power dissipation capacitance No load 70 pF
pd
CC
2 V 72 300 450 375
4.5 V 25 60 90 75
6 V 22 52 77 65
2 V 59 300 450 375
4.5 V 21 60 90 75
6 V 18 52 77 65
2 V 50 230 340 285
4.5 V 17 46 68 57
6 V 15 40 58 50
2 V 45 210 315 265
4.5 V 17 42 63 53
6 V 13 36 53 45
TA = 25°C SN54HC251 SN74HC251
MIN TYP MAX MIN MAX MIN MAX
ns
ns
6
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PARAMETER MEASUREMENT INFORMATION
50%
t
t
S1
S2
PHL
PLH
50%50%
10%10%
Test
From Output
Under Test
(see Note A)
Input
In-Phase
Output
Out-of-Phase
Output
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
Input
50%
INPUT RISE AND FALL TIMES
Point
C
L
LOAD CIRCUIT
t
PLH
50%
t
PHL
VOLTAGE WAVEFORMS
90% 90%
t
r
VOLTAGE WAVEFORM
R
L
90% 90%
t
r
50% 50%
10% 10%
t
f
SN54HC251, SN74HC251
DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS132C – DECEMBER 1982 – REVISED FEBRUARY 1999
V
t
CC
f
V
0 V
50%
10%10%
90%90%
CC
V
CC
0 V
V
OH
V
OL
t
f
V
OH
V
OL
t
r
PARAMETER C
t
Output
Control
Output
Output
t
t
t
t
t
PZL
t
PZH
PZH
PZL
PHZ
PLZ
t
en
t
dis
tpd or t
(Low-Level
Enabling)
Waveform 1
(See Note B)
Waveform 2
(See Note B)
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
R
L
1 kΩ
1 kΩ
50%
VOLTAGE WAVEFORMS
L
50 pF
or
150 pF
50 pF
50 pF
or
150 pF
≈ V
50%
50%
CC
S1
Open Closed
Closed Open
Open Closed
Closed Open
Open Open––
50%
t
PLZ
10%
90%
t
PHZ
S2
V
CC
0 V
≈ V
V
OL
V
OH
≈ 0 V
CC
NOTES: A. CL includes probe and test-fixture capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.
D. The outputs are measured one at a time with one input transition per measurement.
E. t
F. t
G. t
PLZ
PZL
PLH
and t
and t
and t
are the same as t
PHZ
are the same as ten.
PZH
are the same as tpd.
PHL
dis
.
Figure 1. Load Circuit and Voltage Waveforms
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7
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Copyright 1999, Texas Instruments Incorporated
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