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74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Rev. 7 — 2 February 2016
Product data sheet
1. General description
The 74HC257; 74HCT257 is a quad 2-input multiplexer with 3-state outputs. Inputs
include clamp diodes. This enables the use of current limiting resistors to interface inputs
to voltages in excess of V
CC
.
2. Features and benefits
Non-inverting data path
3-state outputs interface directly with system bus
Complies with JEDEC standard no. 7A
Input levels:
For 74HC257: CMOS level
For 74HCT257: TTL level
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
Table 1.
Ordering information
Package
Temperature range
74HC257D
74HCT257D
74HC257DB
74HCT257DB
74HC257PW
74HCT257PW
40 C
to +125
C
TSSOP16
40 C
to +125
C
SSOP16
plastic shrink small outline package; 16 leads;
body width 5.3 mm
plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT338-1
SOT403-1
40 C
to +125
C
Name
SO16
Description
Version
plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
Type number
NXP Semiconductors
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
4. Functional diagram
Fig 1.
Logic symbol
Fig 2.
IEC logic symbol
Fig 3.
Functional diagram
74HC_HCT257
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
Rev. 7 — 2 February 2016
2 of 17
NXP Semiconductors
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Fig 4.
Logic diagram
5. Pinning information
5.1 Pinning
Fig 5.
Pin configuration SO16, SSOP16 and TSSOP16
74HC_HCT257
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
Rev. 7 — 2 February 2016
3 of 17
NXP Semiconductors
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
5.2 Pin description
Table 2.
Symbol
S
1I0 to 4I0
1I1 to 4I1
1Y to 4Y
GND
OE
V
CC
Pin description
Pin
1
2, 5, 11, 14
3, 6, 10, 13
4, 7, 9, 12
8
15
16
Description
common data select input
data input from source 0
data input from source 1
3-state multiplexer output
ground (0 V)
3-state output enable input (active LOW)
supply voltage
6. Functional description
6.1 Function table
Table 3.
Control
OE
H
L
L
L
L
[1]
Function table
[1]
Input
S
X
H
H
L
L
nl0
X
X
X
L
H
nl1
X
L
H
X
X
Output
nY
Z
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
SO16 package
SSOP16 package
TSSOP16 package
[1]
[2]
[3]
[2]
[3]
[3]
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
[1]
[1]
Min
0.5
-
-
-
-
70
65
-
-
-
Max
+7
20
20
35
+70
-
+150
500
500
500
Unit
V
mA
mA
mA
mA
mA
C
mW
mW
mW
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
For SO16 packages: above 70
C,
P
tot
derates linearly with 8 mW/K.
For SSOP16 and TSSOP16 packages: above 60
C,
P
tot
derates linearly with 5.5 mW/K.
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
74HC_HCT257
Product data sheet
Rev. 7 — 2 February 2016
4 of 17
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