SCLS132E − DECEMBER 1982 − REVISED SEPTEMBER 2003
D 3-State Version of ’HC151
D Wide Operating Voltage Range of 2 V to 6 V
D High-Current 3-State Outputs Interface
D
D
D
D
D
D
SN54HC251 . . . J OR W PACKAGE
SN74HC251 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
Directly With System Bus or Can Drive Up
To 15 LSTTL Loads
Low Power Consumption, 80-µA Max ICC
Typical tpd = 9 ns
±6-mA Output Drive at 5 V
Low Input Current of 1 µA Max
Perform Parallel-to-Serial Conversion
Complementary Outputs Provide True and
Inverted Data
D3
D2
D1
D0
Y
W
OE
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
D4
D5
D6
D7
A
B
C
SN54HC251 . . . FK PACKAGE
(TOP VIEW)
D2
D3
NC
VCC
D4
description/ordering information
These data selectors/multiplexers contain full
binary decoding to select 1-of-8 data sources and
feature strobe-controlled complementary 3-state
outputs.
D1
D0
NC
Y
W
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
D5
D6
NC
D7
A
OE
GND
NC
C
B
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) input. The outputs are
disabled when OE is high.
4
NC − No internal connection
ORDERING INFORMATION
PACKAGE†
TA
PDIP − N
SN74HC251N
Tube of 40
SN74HC251D
Reel of 2500
SN74HC251DR
Reel of 250
SN74HC251DT
SOP − NS
Reel of 2000
SN74HC251NSR
HC251
SSOP − DB
Reel of 2000
SN74HC251DBR
HC251
Tube of 90
SN74HC251PW
Reel of 2000
SN74HC251PWR
TSSOP − PW
−55°C
−55
C to 125
125°C
C
TOP-SIDE
MARKING
Tube of 25
SOIC − D
−40°C
−40
C to 85
85°C
C
ORDERABLE
PART NUMBER
SN74HC251N
HC251
HC251
Reel of 250
SN74HC251PWT
CDIP − J
Tube of 25
SNJ54HC251J
SNJ54HC251J
CFP − W
Tube of 150
SNJ54HC251W
SNJ54HC251W
LCCC − FK
Tube of 55
SNJ54HC251FK
SNJ54HC251FK
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
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.
Copyright 2003, Texas Instruments Incorporated
!"# $ %&'# "$ (&)*%"# +"#',
+&%#$ %! # $('%%"#$ (' #-' #'!$ '."$ $#&!'#$
$#"+"+ /""#0, +&%# (%'$$1 +'$ # '%'$$"*0 %*&+'
#'$#1 "** (""!'#'$,
(+&%#$ %!(*"# # 23 "** (""!'#'$ "' #'$#'+
&*'$$ #-'/$' #'+, "** #-' (+&%#$ (+&%#
(%'$$1 +'$ # '%'$$"*0 %*&+' #'$#1 "** (""!'#'$,
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SCLS132E − DECEMBER 1982 − REVISED SEPTEMBER 2003
FUNCTION TABLE
OUTPUTS
INPUTS
SELECT
OE
Y
W
C
B
A
X
X
X
H
Z
Z
L
L
L
L
D0
D0
L
L
H
L
D1
D1
L
H
L
L
D2
D2
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
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SCLS132E − DECEMBER 1982 − REVISED SEPTEMBER 2003
logic diagram (positive logic)
OE
A
B
C
D0
D1
D2
7
11
10
9
4
TG
3
TG
2
TG
5
D3
D4
TG
15
TG
6
D5
D6
D7
Y
1
14
W
TG
13
TG
12
TG
Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
SCLS132E − DECEMBER 1982 − REVISED SEPTEMBER 2003
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±70 mA
Package thermal impedance, θJA (see Note 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W
DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W
NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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.
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 51-7.
recommended operating conditions (see Note 3)
SN54HC251
VCC
VIH
Supply voltage
High-level input voltage
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 2 V
VIL
VI
VO
∆t/∆v
Low-level input voltage
MIN
NOM
MAX
2
5
6
MIN
NOM
MAX
2
5
6
1.5
1.5
3.15
3.15
4.2
4.2
VCC = 4.5 V
VCC = 6 V
Input voltage
0
Output voltage
0
Input transition rise/fall time
SN74HC251
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
0.5
1.35
1.35
1.8
1.8
0
0
V
V
0.5
VCC
VCC
UNIT
VCC
VCC
1000
1000
500
500
400
400
V
V
V
ns
TA
Operating free-air temperature
−55
125
−40
85
°C
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,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SCLS132E − DECEMBER 1982 − REVISED SEPTEMBER 2003
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
IOH = −20 µA
VOH
VI = VIH or VIL
IOH = −6 mA
IOH = −7.8 mA
IOL = 20 µA
VOL
VI = VIH or VIL
IOL = 6 mA
IOL = 7.8 mA
II
IOZ
VI = VCC or 0
VO = VCC or 0,
ICC
Ci
VI = VCC or 0,
VI = VIH or VIL
IO = 0
VCC
MIN
TA = 25°C
TYP
MAX
SN54HC251
MIN
MAX
SN74HC251
MIN
2V
1.9
1.998
1.9
1.9
4.5 V
4.4
4.499
4.4
4.4
6V
5.9
5.999
5.9
5.9
4.5 V
3.98
4.3
3.7
3.84
6V
5.48
5.8
5.2
MAX
UNIT
V
5.34
2V
0.002
0.1
0.1
0.1
4.5 V
0.001
0.1
0.1
0.1
6V
0.001
0.1
0.1
0.1
4.5 V
0.17
0.26
0.4
0.33
6V
0.15
0.26
0.4
0.33
6V
±0.1
±100
±1000
±1000
nA
6V
±0.01
±0.5
±10
±5
µA
8
160
80
µA
10
10
10
pF
6V
2 V to 6 V
3
V
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
A, B, or C
ten
tdis
tt
OE
OE
SN54HC251
SN74HC251
VCC
2V
58
205
300
256
W or Y
4.5 V
21
41
60
51
6V
19
35
51
44
2V
44
195
283
244
4.5 V
17
39
57
49
6V
15
33
48
41
2V
30
145
210
181
4.5 V
10
29
42
36
6V
9
25
36
31
2V
25
195
283
244
4.5 V
15
39
57
49
6V
14
33
48
41
2V
20
75
110
95
4.5 V
8
15
22
19
6V
6
13
19
16
tpd
Any D
TA = 25°C
MIN
TYP
MAX
TO
(OUTPUT)
W or Y
W or Y
W or Y
W or Y
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MIN
MAX
MIN
MAX
UNIT
ns
ns
ns
ns
5
SCLS132E − DECEMBER 1982 − REVISED SEPTEMBER 2003
switching characteristics over recommended operating free-air temperature range, CL = 150 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
SN54HC251
SN74HC251
TO
(OUTPUT)
VCC
2V
72
300
450
375
A, B, or C
W or Y
4.5 V
25
60
90
75
6V
22
52
77
65
2V
59
300
450
375
4.5 V
21
60
90
75
6V
18
52
77
65
tpd
Any D
ten
TA = 25°C
TYP
MAX
FROM
(INPUT)
OE
tt
W or Y
W or Y
W or Y
MIN
MIN
MAX
MIN
MAX
2V
50
230
340
285
4.5 V
17
46
68
57
6V
15
40
58
50
2V
45
210
315
265
4.5 V
17
42
63
53
6V
13
36
53
45
UNIT
ns
ns
ns
operating characteristics, TA = 25°C
PARAMETER
Cpd
6
TEST CONDITIONS
Power dissipation capacitance
No load
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TYP
70
UNIT
pF
SCLS132E − DECEMBER 1982 − REVISED SEPTEMBER 2003
PARAMETER MEASUREMENT INFORMATION
VCC
PARAMETER
Test
Point
From Output
Under Test
tPZH
S1
ten
RL
CL
(see Note A)
1 kΩ
tPZL
tPHZ
tdis
S2
RL
tPLZ
tpd or tt
1 kΩ
−−
LOAD CIRCUIT
CL
S1
S2
50 pF
or
150 pF
Open
Closed
Closed
Open
Open
Closed
Closed
Open
Open
Open
50 pF
50 pF
or
150 pF
VCC
Input
50%
50%
0V
tPLH
In-Phase
Output
50%
10%
tPHL
90%
VOH
50%
10% V
OL
tf
90%
tr
tPHL
Out-of-Phase
Output
90%
tPLH
50%
10%
50%
10%
90%
VOH
VOL
tf
tr
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
Output
Control
(Low-Level
Enabling)
VCC
50%
50%
0V
tPZL
Output
Waveform 1
(See Note B)
tPLZ
10%
tPZH
Input
50%
10%
90%
VCC
90%
50%
10% 0 V
tr
Output
Waveform 2
(See Note B)
≈VCC
≈VCC
50%
VOL
tPHZ
50%
90%
VOH
≈0 V
tf
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
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. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
7
PACKAGE OPTION ADDENDUM
www.ti.com
17-Oct-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
Lead/Ball Finish
MSL Peak Temp (3)
85125012A
ACTIVE
LCCC
FK
20
1
TBD
Call TI
Level-NC-NC-NC
8512501EA
ACTIVE
CDIP
J
16
1
TBD
Call TI
Level-NC-NC-NC
Level-NC-NC-NC
SN54HC251J
ACTIVE
CDIP
J
16
1
TBD
Call TI
SN74HC251D
ACTIVE
SOIC
D
16
40
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251DBR
ACTIVE
SSOP
DB
16
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251DBRE4
ACTIVE
SSOP
DB
16
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251DE4
ACTIVE
SOIC
D
16
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251DR
ACTIVE
SOIC
D
16
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251DRE4
ACTIVE
SOIC
D
16
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251DT
ACTIVE
SOIC
D
16
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251DTE4
ACTIVE
SOIC
D
16
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251N
ACTIVE
PDIP
N
16
25
Pb-Free
(RoHS)
CU NIPDAU
Level-NC-NC-NC
SN74HC251NE4
ACTIVE
PDIP
N
16
25
Pb-Free
(RoHS)
CU NIPDAU
Level-NC-NC-NC
SN74HC251NSR
ACTIVE
SO
NS
16
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251NSRE4
ACTIVE
SO
NS
16
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251PW
ACTIVE
TSSOP
PW
16
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251PWR
ACTIVE
TSSOP
PW
16
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251PWRE4
ACTIVE
TSSOP
PW
16
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251PWT
ACTIVE
TSSOP
PW
16
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SN74HC251PWTE4
ACTIVE
TSSOP
PW
16
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SNJ54HC251FK
ACTIVE
LCCC
FK
20
1
TBD
Call TI
Level-NC-NC-NC
SNJ54HC251J
ACTIVE
CDIP
J
16
1
TBD
Call TI
Level-NC-NC-NC
40
90
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS &
http://www.ti.com/productcontent for the latest availability information and additional product content details.
Addendum-Page 1
no
Sb/Br)
-
please
check
PACKAGE OPTION ADDENDUM
www.ti.com
17-Oct-2005
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 2
MECHANICAL DATA
MLCC006B – OCTOBER 1996
FK (S-CQCC-N**)
LEADLESS CERAMIC CHIP CARRIER
28 TERMINAL SHOWN
18
17
16
15
14
13
NO. OF
TERMINALS
**
12
19
11
20
10
A
B
MIN
MAX
MIN
MAX
20
0.342
(8,69)
0.358
(9,09)
0.307
(7,80)
0.358
(9,09)
28
0.442
(11,23)
0.458
(11,63)
0.406
(10,31)
0.458
(11,63)
21
9
22
8
44
0.640
(16,26)
0.660
(16,76)
0.495
(12,58)
0.560
(14,22)
23
7
52
0.739
(18,78)
0.761
(19,32)
0.495
(12,58)
0.560
(14,22)
24
6
68
0.938
(23,83)
0.962
(24,43)
0.850
(21,6)
0.858
(21,8)
84
1.141
(28,99)
1.165
(29,59)
1.047
(26,6)
1.063
(27,0)
B SQ
A SQ
25
5
26
27
28
1
2
3
4
0.080 (2,03)
0.064 (1,63)
0.020 (0,51)
0.010 (0,25)
0.020 (0,51)
0.010 (0,25)
0.055 (1,40)
0.045 (1,14)
0.045 (1,14)
0.035 (0,89)
0.045 (1,14)
0.035 (0,89)
0.028 (0,71)
0.022 (0,54)
0.050 (1,27)
4040140 / D 10/96
NOTES: A.
B.
C.
D.
E.
All linear dimensions are in inches (millimeters).
This drawing is subject to change without notice.
This package can be hermetically sealed with a metal lid.
The terminals are gold plated.
Falls within JEDEC MS-004
POST OFFICE BOX 655303
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MECHANICAL DATA
MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001
DB (R-PDSO-G**)
PLASTIC SMALL-OUTLINE
28 PINS SHOWN
0,38
0,22
0,65
28
0,15 M
15
0,25
0,09
8,20
7,40
5,60
5,00
Gage Plane
1
14
0,25
A
0°–ā8°
0,95
0,55
Seating Plane
2,00 MAX
0,10
0,05 MIN
PINS **
14
16
20
24
28
30
38
A MAX
6,50
6,50
7,50
8,50
10,50
10,50
12,90
A MIN
5,90
5,90
6,90
7,90
9,90
9,90
12,30
DIM
4040065 /E 12/01
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion not to exceed 0,15.
Falls within JEDEC MO-150
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,30
0,19
0,65
14
0,10 M
8
0,15 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
1
7
0°– 8°
A
0,75
0,50
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,10
8
14
16
20
24
28
A MAX
3,10
5,10
5,10
6,60
7,90
9,80
A MIN
2,90
4,90
4,90
6,40
7,70
9,60
DIM
4040064/F 01/97
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion not to exceed 0,15.
Falls within JEDEC MO-153
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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