74HC251; 74HCT251
8-input multiplexer; 3-state
Rev. 4 — 1 February 2016
Product data sheet
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 V
CC
.
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 2 000 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
Table 1.
Ordering information
Package
Temperature range Name
74HC251D
74HCT251D
74HC251DB
74HCT251DB
74HC251PW
74HCT251PW
40 C
to +125
C
40 C
to +125
C
SSOP16
plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
SOT403-1
40 C
to +125
C
SO16
Description
Version
plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
Type number
TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
Nexperia
74HC251; 74HCT251
8-input multiplexer; 3-state
4. Functional diagram
Fig 1.
Logic symbol
Fig 2.
Functional diagram
Fig 3.
Logic diagram
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 B.V. 2017. All rights reserved
Nexperia
74HC251; 74HCT251
8-input multiplexer; 3-state
5. Pinning information
5.1 Pinning
Fig 4.
Pin configuration SO16
Fig 5.
Pin configuration SSOP16 and TSSOP16
5.2 Pin description
Table 2.
Symbol
I0 to I7
Y
Y
OE
GND
S0, S1, S2
V
CC
Pin description
Pin
4, 3, 2, 1, 15, 14, 13, 12
5
6
7
8
11, 10, 9
16
Description
data inputs
multiplexer output
complementary multiplexer output
output enable input (active LOW)
ground (0 V)
common data select inputs
supply voltage
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 B.V. 2017. All rights reserved
Nexperia
74HC251; 74HCT251
8-input multiplexer; 3-state
6. Functional description
Table 3.
Input
OE
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
[1]
Function table
[1]
Output
S2
X
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
S1
X
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
S0
X
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
I0
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
I1
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
I2
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
I3
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
I4
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
I5
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
I6
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
I7
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
Y
Z
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
Y
Z
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
Parameter
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
T
amb
=
40 C
to +125
C
SO16 package
(T)SSOP16 package
[1]
[2]
For SO16 package: P
tot
derates linearly with 8 mW/K above 70
C.
For SSOP16 and TSSOP16 packages: P
tot
derates linearly with 5.5 mW/K above 60
C.
[1]
[2]
Conditions
V
I
<
0.5
V or V
I
> V
CC
+ 0.5 V
V
O
<
0.5
V or V
O
> V
CC
+ 0.5 V
V
O
=
0.5
V to (V
CC
+ 0.5 V)
Min
0.5
-
-
-
-
50
65
-
-
Max
+7
20
20
25
+50
-
+150
500
500
Unit
V
mA
mA
mA
mA
mA
C
mW
mW
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 B.V. 2017. All rights reserved
Nexperia
74HC251; 74HCT251
8-input multiplexer; 3-state
8. Recommended operating conditions
Table 5.
Recommended operating conditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter
V
CC
V
I
V
O
T
amb
t/V
supply voltage
input voltage
output voltage
ambient temperature
input transition rise and fall rate
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
Conditions
Min
2.0
0
0
40
-
-
-
74HC251
Typ
5.0
-
-
+25
-
1.67
-
Max
6.0
V
CC
V
CC
+125
625
139
83
Min
4.5
0
0
40
-
-
-
74HCT251
Typ
5.0
-
-
+25
-
1.67
-
Max
5.5
V
CC
V
CC
+125
-
139
-
V
V
V
C
ns/V
ns/V
ns/V
Unit
9. Static characteristics
Table 6.
Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
T
amb
= 25
C
Min
74HC251
V
IH
HIGH-level
input voltage
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
V
IL
LOW-level
input voltage
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
V
OH
HIGH-level
output voltage
V
I
= V
IH
or V
IL
I
O
=
20 A;
V
CC
= 2.0 V
I
O
=
20 A;
V
CC
= 4.5 V
I
O
=
20 A;
V
CC
= 6.0 V
I
O
=
4.0
mA; V
CC
= 4.5 V
I
O
=
5.2
mA; V
CC
= 6.0 V
V
OL
LOW-level
output voltage
V
I
= V
IH
or V
IL
I
O
= 20
A;
V
CC
= 2.0 V
I
O
= 20
A;
V
CC
= 4.5 V
I
O
= 20
A;
V
CC
= 6.0 V
I
O
= 4.0 mA; V
CC
= 4.5 V
I
O
= 5.2 mA; V
CC
= 6.0 V
I
I
I
OZ
input leakage
current
OFF-state
output current
V
I
= V
CC
or GND;
V
CC
= 6.0 V
V
I
= V
IH
or V
IL
;
V
O
= V
CC
or GND;
V
CC
= 6.0 V
-
-
-
-
-
-
-
0
0
0
0.15
0.16
-
-
0.1
0.1
0.1
0.26
0.26
0.1
0.5
-
-
-
-
-
-
-
0.1
0.1
0.1
0.33
0.33
1.0
5.0
-
-
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
1.0
10.0
V
V
V
V
V
A
A
1.9
4.4
5.9
3.98
5.48
2.0
4.5
6.0
4.32
5.81
-
-
-
-
-
1.9
4.4
5.9
3.84
5.34
-
-
-
-
-
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
V
V
V
V
V
1.5
3.15
4.2
-
-
-
1.2
2.4
3.2
0.8
2.1
2.8
-
-
-
0.5
1.35
1.8
1.5
3.15
4.2
-
-
-
-
-
-
0.5
1.35
1.8
1.5
3.15
4.2
-
-
-
-
-
-
0.5
1.35
1.8
V
V
V
V
V
V
Typ
Max
T
amb
=
40 C
to
+85
C
Min
Max
T
amb
=
40 C
to Unit
+125
C
Min
Max
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 B.V. 2017. All rights reserved
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