1. General description
The 74HC251; 74HCT251 is an 8-bit multiplexer with eight binary inputs (I0 to I7), three
select inputs (S0 to S2) and an output enable input (OE). The select inputs select one of
the eight binary inputs and route it to the complementary outputs (Y and Y). A HIGH on
OE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp
diodes that enable the use of current limiting resistors to interface inputs to voltages in
excess of VCC.
2. Features and benefits
Input levels:
For 74HC251: CMOS level
For 74HCT251: TTL level
Low-power dissipation
Non-inverting data path
Specified in compliance with JEDEC standard no. 7A
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from 40 C to +85 C and from 40 C to +125 C
3. Ordering information
74HC251; 74HCT251
8-input multiplexer; 3-state
Rev. 4 — 1 February 2016 Product data sheet
Table 1. Ordering information
Type number Package
Temperatu re range Name Description Version
74HC251D 40 C to +125 C SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
74HCT251D
74HC251DB 40 C to +125 C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm SOT338-1
74HCT251DB
74HC251PW 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm SOT403-1
74HCT251PW
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 2 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
4. Functional diagram
Fig 1. Logic symbol Fig 2. Functional di agram
DDD
2(
6
,,
6
,,
6
,,
<
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DDD
6
08/7,3/(;(5
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6
6
2(
Fig 3. Logic diag ra m
DDD
<
<
,
,
,
,
,
,
,
,
6 6 6 2(
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 3 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
5. Pinning information
5.1 Pinning
5.2 Pin description
Fig 4. Pin configuration SO16 Fig 5. Pin configuration SSOP16 and TSSOP16
DDD
,
,
,
,
,
,
,
,
<
<
6
2
(
6
6
9&&
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+&
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DDD
,
9&&
,
,
,
,
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<
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<
6
2
(
6
*1' 6
+&
+&7
Table 2. Pin description
Symbol Pin Description
I0 to I7 4, 3, 2, 1, 15, 14, 13, 12 data inputs
Y 5 multiplexer output
Y6 complementary multiplexer output
OE 7 output enable input (active LOW)
GND 8 ground (0 V)
S0, S1, S2 11, 10, 9 common data select inputs
VCC 16 supply voltage
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 4 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
6. Functional description
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
7. Limiting values
[1] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
[2] For SSOP16 and TSSOP16 packages: Ptot derates linearly with 5.5 mW/K above 60 C.
Table 3. Function table[1]
Input Output
OE S2 S1 S0 I0 I1 I2 I3 I4 I5 I6 I7 Y Y
HXXXXXXXXXXXZZ
LLLLLXXXXXXXHL
LLLLHXXXXXXXLH
LLLHXLXXXXXXHL
LLLHXHXXXXXXLH
LLHLXXLXXXXXHL
LLHLXXHXXXXXLH
LLHHXXXLXXXXHL
LLHHXXXHXXXXLH
LHLLXXXXLXXXHL
LHLLXXXXHXXXLH
LHLHXXXXXLXXHL
LHLHXXXXXHXXLH
LHHLXXXXXXLXHL
LHHLXXXXXXHXLH
LHHHXXXXXXXLHL
LHHHXXXXXXXHLH
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
VCC supply voltage 0.5 +7 V
IIK input clamping current VI < 0.5 V or VI>V
CC +0.5 V - 20 mA
IOK output clamping current VO<0.5 V or VO>V
CC +0.5V - 20 mA
IOoutput current VO = 0.5 V to (VCC +0.5V) - 25 mA
ICC supply current - +50 mA
IGND ground current 50 - mA
Tstg storage temperature 65 +150 C
Ptot total power dissipation Tamb = 40 C to +125 C
SO16 package [1] - 500 mW
(T)SSOP16 package [2] - 500 mW
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 5 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
8. Recommended operating conditions
9. Static characteristics
Table 5. Recommended operating con ditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter Conditions 74HC251 74HCT251 Unit
Min Typ Max Min Typ Max
VCC supply voltage 2.0 5.0 6.0 4.5 5.0 5.5 V
VIinput voltage 0 - VCC 0-V
CC V
VOoutput voltage 0 - VCC 0-V
CC V
Tamb ambient temperature 40 +25 +125 40 +25 +125 C
t/V input transition rise and fall rate VCC = 2.0 V - - 625 - - - ns/V
VCC = 4.5 V - 1.67 139 - 1.67 139 ns/V
VCC = 6.0 V - - 83 - - - ns/V
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C to
+85 CTamb = 40 C to
+125 CUnit
Min Typ Max Min Max Min Max
74HC251
VIH HIGH-level
input voltage VCC = 2.0 V 1.5 1.2 - 1.5 - 1.5 - V
VCC = 4.5 V 3.15 2.4 - 3.15 - 3.15 - V
VCC = 6.0 V 4.2 3.2 - 4.2 - 4.2 - V
VIL LOW-level
input voltage VCC = 2.0 V - 0.8 0.5 - 0.5 - 0.5 V
VCC = 4.5 V - 2.1 1.35 - 1.35 - 1.35 V
VCC = 6.0 V - 2.8 1.8 - 1.8 - 1.8 V
VOH HIGH-level
output voltage VI=V
IH or VIL
IO=20 A; VCC = 2.0 V 1.9 2.0 - 1.9 - 1.9 - V
IO=20 A; VCC = 4.5 V 4.4 4.5 - 4.4 - 4.4 - V
IO=20 A; VCC = 6.0 V 5.9 6.0 - 5.9 - 5.9 - V
IO=4.0 mA; VCC = 4.5 V 3.98 4.32 - 3.84 - 3.7 - V
IO=5.2 mA; VCC = 6.0 V 5.48 5.81 - 5.34 - 5.2 - V
VOL LOW-level
output voltage VI=V
IH or VIL
IO=20A; VCC = 2.0 V - 0 0.1 - 0.1 - 0.1 V
IO=20A; VCC = 4.5 V - 0 0.1 - 0.1 - 0.1 V
IO=20A; VCC = 6.0 V - 0 0.1 - 0.1 - 0.1 V
IO= 4.0 mA; VCC = 4.5 V - 0.15 0.26 - 0.33 - 0.4 V
IO= 5.2 mA; VCC = 6.0 V - 0.16 0.26 - 0.33 - 0.4 V
IIinput leakage
current VI=V
CC or GND;
VCC =6.0V --0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current VI=V
IH or VIL;
VO=V
CC or GND;
VCC =6.0V
--0.5 - 5.0 - 10.0 A
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 6 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
ICC supply current VI=V
CC or GND; IO=0A;
VCC =6.0V - - 8.0 - 80 - 160 A
CIinput
capacitance -3.5- pF
74HCT251
VIH HIGH-level
input voltage VCC = 4.5 V to 5.5 V 2.0 1.6 - 2.0 - 2.0 - V
VIL LOW-level
input voltage VCC = 4.5 V to 5.5 V - 1.2 0.8 - 0.8 - 0.8 V
VOH HIGH-level
output voltage VI=V
IH or VIL; VCC =4.5V
IO=20 A 4.4 4.5 - 4.4 - 4.4 - V
IO=4 mA 3.98 4.32 - 3.84 - 3.7 - V
VOL LOW-level
output voltage VI=V
IH or VIL; VCC =4.5V
IO=20A - 0 0.1 - 0.1 - 0.1 V
IO= 4.0 mA - 0.15 0.26 - 0.33 - 0.4 V
IIinput leakage
current VI=V
CC or GND;
VCC =5.5V --0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current VI=V
IH or VIL;
VO=V
CC or GND;
VCC =5.5V
--0.5 - 5.0 - 10 A
ICC supply current VI=V
CC or GND; IO=0A;
VCC =5.5V - - 8.0 - 80 - 160 A
ICC additional
supply current VI=V
CC 2.1 V;
other inputs at VCC or GND;
VCC = 4.5 V to 5.5 V;
IO=0A
per input pin; In inputs - 100 360 - 450 - 490 A
per input pin; OE input - 150 540 - 675 - 735 A
per input pin; Sn input - 150 540 - 675 - 735 A
CIinput
capacitance -3.5- pF
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C to
+85 CTamb = 40 C to
+125 CUnit
Min Typ Max Min Max Min Max
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 7 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit, see Figure 9.
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C
to +85 CTamb = 40 C
to +125 CUnit
Min Typ Max Min Max Min Max
74HC251
tpd propagation
delay In to Y; see Figure 6 [1]
VCC = 2.0 V - 50 170 - 215 - 255 ns
VCC = 4.5 V - 18 34 - 43 - 51 ns
VCC =5V; C
L=15pF - 15 - - - - - ns
VCC = 6.0 V - 14 29 - 37 - 43 ns
In to Y; see Figure 6 [1]
VCC = 2.0 V - 55 175 - 220 - 265 ns
VCC = 4.5 V - 20 35 - 44 - 53 ns
VCC =5V; C
L=15pF - 17 - - - - - ns
VCC = 6.0 V - 16 30 - 37 - 45 ns
Sn to Y; see Figure 7 [1]
VCC = 2.0 V - 66 205 - 255 - 310 ns
VCC = 4.5 V - 24 41 - 51 - 62 ns
VCC =5V; C
L=15pF - 20 - - - - - ns
VCC = 6.0 V - 19 35 - 43 - 53 ns
Sn to Y; see Figure 7 [1]
VCC = 2.0 V - 69 205 - 255 - 310 ns
VCC = 4.5 V - 25 41 - 51 - 62 ns
VCC =5V; C
L=15pF - 21 - - - - - ns
VCC = 6.0 V - 20 35 - 43 - 53 ns
ten enable time OE to Y, Y; see Figure 7 [2]
VCC = 2.0 V - 36 140 - 175 - 210 ns
VCC = 4.5 V - 13 28 - 35 - 42 ns
VCC = 6.0 V - 10 24 - 30 - 36 ns
tdis disable time OE to Y, Y; see Figure 7 [3]
VCC = 2.0 V - 39 140 - 170 - 210 ns
VCC = 4.5 V - 14 28 - 35 - 42 ns
VCC = 6.0 V - 11 24 - 30 - 36 ns
tttransition
time Y, Y; see Figure 6 [4]
VCC = 2.0 V - 19 75 - 95 - 110 ns
VCC = 4.5 V - 7 15 - 19 - 22 ns
VCC = 6.0 V - 6 13 - 16 - 19 ns
CPD power
dissipation
capacitance
CL= 50 pF; f = 1 MHz;
VI=GNDtoV
CC
[5] -44- - - - -pF
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 8 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
[1] tpd is the same as tPLH and tPHL.
[2] ten is the same as tPZH and tPZL.
[3] tdis is the same as tPLZ and tPHZ.
[4] tt is the same as tTHL and tTLH.
[5] CPD is used to determine the dynamic power dissipation (PD in W).
PD=C
PD VCC2fiN+(CLVCC2fo) where:
fi = input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
(CLVCC2fo) = sum of outputs.
74HCT251
tpd propagation
delay In to Y; see Figure 6 [1]
VCC = 4.5 V - 22 35 - 44 - 53 ns
VCC =5V; C
L=15pF - 19 - - - - - ns
In to Y; see Figure 6 [1]
VCC = 4.5 V - 22 35 - 44 - 53 ns
VCC =5V; C
L=15pF - 19 - - - - - ns
Sn to Y; see Figure 7 [1]
VCC = 4.5 V - 24 44 - 55 - 66 ns
VCC =5V; C
L=15pF - 20 - - - - - ns
Sn to Y; see Figure 7 [1]
VCC = 4.5 V - 25 44 - 55 - 66 ns
VCC =5V; C
L=15pF - 21 - - - - - ns
ten enable time OE to Y, Y; see Figure 7 [2]
VCC = 4.5 V - 13 28 - 35 - 42 ns
VCC =5V; C
L=15pF - 13 - - - - - ns
tdis disable time OE to Y, Y; see Figure 7 [3]
VCC = 4.5 V - 14 28 - 35 - 42 ns
VCC =5V; C
L=15pF - 18 - - - - - ns
tttransition
time Y, Y; see Figure 6 [4]
VCC = 4.5 V - 7 15 - 19 - 22 ns
CPD power
dissipation
capacitance
CL= 50 pF; f = 1 MHz;
VI=GNDtoV
CC
[5] -46- - - - -pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit, see Figure 9.
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C
to +85 CTamb = 40 C
to +125 CUnit
Min Typ Max Min Max Min Max
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 9 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
11. Waveforms
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6. Propagation delay input (In) to output (Y, Y) and the output (Y, Y) transition time
DDD
W
3/+
W
3+/
9
0
9
0
9
0
9
0
<R
XWSXW
,QLQSXW
9
,
*1'
9
2+
9
2/
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7/+
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7+/
W
3+/
W
3/+
9
0
9
0
W
7+
/
W
7/+
<R
XWSXW
9
2+
9
2/
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7. Prop a ga t io n de la y input (Sn, OE) to output (Y, Y)
DDD
W3+/
W3/+
90
90
W
7+/
W7/+
<RXWSXW
92+
92/
W3/+
W3+/
9090
9090
<RXWSXW
6Q2(LQSXW
9
,
*1'
92+
92/
W
7/+
W7+/
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 10 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 8. Enable and disable times
DDH
W3/=
W3+=
RXWSXWV
GLVDEOHG
RXWSXWV
HQDEOHG
RXWSXWV
HQDEOHG
RXWSXW
/2:WR2))
2))WR/2:
RXWSXW
+,*+WR2))
2))WR+,*+
2(LQSXW
9,
92/
92+
9&&
90
*1'
*1'
W3=/
W3=+
90
90
Table 8. Measurement points
Type Input Output
VMVM
74HC251 0.5VCC 0.5VCC
74HCT251 1.3 V 1.3 V
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 11 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
Test data is given in Table 9.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance.
RL = Load resistance.
S1 = Test selection switch.
Fig 9. Test circuit for measuring switching times
9
0
9
0
W
:
W
:
9
9
,
9
,
QHJDWLYH
SXOVH
SRVLWLYH
SXOVH
9
9
0
9
0
W
I
W
U
W
U
W
I
DDG
'87
9
&&
9
&&
9,92
57
5/6
&/
RSHQ
*
Table 9. Test data
Type Input Load S1 position
VItr, tfCLRLtPHL, tPLH tPZH, tPHZ tPZL, tPLZ
74HC251 VCC 6ns 15pF, 50 pF 1kopen GND VCC
74HCT251 3 V 6 ns 15 pF, 50 pF 1 kopen GND VCC
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 12 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
12. Package outline
Fig 10. Package outline SOT109-1 (SO16)
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 13 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
Fig 11. Package outline SOT338-1 (SSOP16)
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 14 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
Fig 12. Package outline SOT403-1 (TSSOP16)
81,7 $
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 15 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
13. Abbreviations
14. Revision history
Table 10. Abbreviations
Acronym Description
CMOS Complementary Metal Oxide Semiconductor
DUT Device Under Test
ESD ElectroStatic Discharge
HBM Human Body Model
MM Machine Model
TTL Transistor-Transistor Logic
MIL Military
Table 11. Revision history
Document ID Release date Data sheet status Change notice Supersedes
74HC_HCT251 v.4 20160201 Product data sheet - 74HC_HCT251 v.3
Modifications: •Type numbers 74HC251 N and 74HCT251N (SOT38-4) removed.
74HC_HCT251 v.3 20130709 Product data sheet - 74HC_HCT251_CNV v.2
Modifications: •The format of this data sheet has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
•Legal texts have been adapted to the new company name where appropriate.
74HC_HCT251_CNV v.2 19970828 Product specification -
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 16 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
15. Legal information
15.1 Data sheet status
[1] Please consult the most recently issued document before initiating or completing a design.
[2] The term ‘short data sheet’ is explained in section “Definitions”.
[3] The product status of de vice(s) descr ibed in th is document m ay have cha nged since thi s document w as publish ed and may di ffe r in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nexperia.com.
15.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. Nexperia does not give any
representations or warrant ies as to t he accuracy or completeness of
information included herein and shall have no liab ility for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and tit le. A short data sh eet is intended
for quick reference only and shou ld not b e relied u pon to cont ain det ailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local Nexperia sales
office. In case of any inconsistency or conf lict with the short data sheet, the
full data sheet shall pre va il.
Product specificat ion — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
Nexperia and its customer, unless Nexperia and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the Nexperia product is
deemed to off er functions and qualities beyond those described in the
Product data sheet.
15.3 Disclaimers
Limited warr a nty and liability — Information in this document is believed to
be accurate and reliable. However, Nexperia does not give any
representations or warrant ies, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. Nexperia takes no
responsibility for the content in this document if provided by an information
source outside of Nexperia.
In no event shall Nexperia be liable for any indirect, incidental,
punitive, special or consequ ential damages (including - wit hout limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, Nexperia's aggregate and cumulative liability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of Nexperia.
Right to make changes — Nexperia reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all informa tion supplied prior
to the publication hereof .
Suitability for use — Nexperia products are not designed,
authorized or warranted to be suitable for use in life support, life-critical or
safety-critical systems or equipme nt, nor in applications where failure or
malfunction of a Nexperia product can reasonably be expected
to result in perso nal injury, death or severe property or environmental
damage. Nexperia and its suppliers accept no liability for
inclusion and/or use of Nexperia products in such equipment or
applications and ther efore such inclu sion and/or use is at the cu stomer’s own
risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. Nexperia makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and ope ration of their applications
and products using Nexperia products, and Nexperia
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the Nexperia
product is suitable and fit for the customer’s applications and
products planned, as well as fo r the planned application and use of
customer’s third party customer(s). Custo mers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
Nexperia does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party custo mer(s). Customer is responsible for doing all necessa ry
testing for the customer’s applications and products using Nexperia
products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). Nexperia does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — Nexperia
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nexperia.com/profile/terms, unless otherwise
agreed in a valid written individua l agreement. In case an individual
agreement is concluded only the ter m s and conditions of the respective
agreement shall apply. Nexperia hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of Nexperia products by customer.
No offer to sell or license — Nothing i n this document may be interpreted or
construed as an of fer t o sell product s that is open for accept ance or the gr ant,
conveyance or implication of any license under any copyrights, patents or
other industrial or intellectual property rights.
Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contains data from the objective specification for product development.
Preliminary [short] dat a sheet Qualification This document contains data from the preliminary specificat ion.
Product [short] data sheet Production This document contains the product specification.
© Nexperia B.V. 2017. All rights reserved
74HC_HCT251 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 4 — 1 February 2016 17 of 18
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific Nexperia product is automotive qualified,
the product is not suitable for automotive use. It i s neit her qualif ied nor tested
in accordance with automotive testing or application requirements. Nexperia
accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automot ive specifications and standards, custome r
(a) shall use the product without Nexperia's warranty of the
product for such au tomotive applications, use and specifi cations, and (b)
whenever customer uses the product for automotive applications beyond
Nexperia's specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies Nexperia for any
liability, damages or failed product claims resulting from custome r design and
use of the product for automotive applications beyond Nexperia's
standard warranty and Nexperia's product specifications.
Translations — A non-English (translated) versio n of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
15.4 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respective ow ners.
16. Contact information
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Nexperia 74HC251; 74HCT251
8-input multiplexer; 3-state
17. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 1
4 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 3
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
6 Functional description . . . . . . . . . . . . . . . . . . . 4
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 4
8 Recommended operating conditions . . . . . . . . 5
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 5
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 7
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
12 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 12
13 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 15
14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 15
15 Legal information. . . . . . . . . . . . . . . . . . . . . . . 16
15.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 16
15.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
15.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
15.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
16 Contact information. . . . . . . . . . . . . . . . . . . . . 17
17 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
© Nexperia B.V. 2017. All rights reserved
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release:
01 February 2016
