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MC74LCX257
Low−Voltage CMOS Quad
2−Input Multiplexer
With 5.0 V−Tolerant Inputs and Outputs
(3−State, Non−Inverting)
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The MC74LCX257 is a high performance, quad 2−input
multiplexer with 3−state outputs operating from a 2.3 to 3.6 V supply.
High impedance TTL compatible inputs significantly reduce current
loading to input drivers while TTL compatible outputs offer improved
switching noise performance. A V
I
specification of 5.5 V allows
MC74LCX257 inputs to be safely driven from 5.0 V devices.
Four bits of data from two sources can be selected using the Select
input. The four outputs present the selected data in the true
(non−inverted) form. The outputs may be switched to a high
impedance state by placing a logic HIGH on the Output Enable (OE)
input. Current drive capability is 24 mA at the outputs.
Features
MARKING
DIAGRAMS
16
SOIC−16
D SUFFIX
CASE 751B
1
16
LCX257
AWLYWW
16
1
•
•
•
•
•
•
•
•
16
1
Designed for 2.3 to 3.6 V V
CC
Operation
5.0 V Tolerant − Interface Capability with 5.0 V TTL Logic
Supports Live Insertion and Withdrawal
I
OFF
Specification Guarantees High Impedance When V
CC
= 0 V
LVTTL Compatible
LVCMOS Compatible
24 mA Balanced Output Sink and Source Capability
Near Zero Static Supply Current in All Three Logic States (10
mA)
Substantially Reduces System Power Requirements
•
Latchup Performance Exceeds 500 mA
•
ESD Performance:
Human Body Model >2000 V
Machine Model >200 V
•
Pb−Free Packages are Available*
TSSOP−16
DT SUFFIX
CASE 948F
LCX
257
ALYW
1
16
SOEIAJ−16
M SUFFIX
CASE 966
1
1
A
L, WL
Y
W, WW
=
=
=
=
Assembly Location
Wafer Lot
Year
Work Week
74LCX257
ALYW
16
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 3 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©
Semiconductor Components Industries, LLC, 2005
1
January, 2005 − Rev. 3
Publication Order Number:
MC74LCX257/D
MC74LCX257
V
CC
16
OE
15
I0c
14
I1c
13
Zc
12
I0d
11
I1d
10
Zd
9
I0a
I1a
I0b
I1b
1
S
2
I0a
3
I1a
4
Za
5
I0b
6
I1b
7
Zb
8
GND
I0c
I1c
I0d
I1d
2
3
5
6
14
13
11
10
4
Za
7
Zb
12
Zc
Figure 1. Pinout: 16−Lead Plastic Package
(Top View)
9
Zd
OE
15
S
1
Figure 2. Logic Diagram
PIN NAMES
Pins
l0n
l1n
OE
S
Zn
Function
Source 0 Data Inputs
Source 1 Data Inputs
Output Enable Input
Select Input
Outputs
TRUTH TABLE
Inputs
OE
H
L
L
L
L
H
L
X
Z
=
=
=
=
S
X
H
H
L
L
l0n
X
X
X
L
H
l1n
X
L
H
X
X
Outputs
Zn
Z
L
H
L
H
High Voltage Level
Low Voltage Level
High or Low Voltage Level and Transitions are Acceptable
High Impedance State
For ICC reasons, DO NOT FLOAT Inputs
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2
MC74LCX257
MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
Parameter
DC Supply Voltage
DC Input Voltage
DC Output Voltage
Value
−0.5 to +7.0
−0.5
≤
V
I
≤
+7.0
−0.5
≤
V
I
≤
+7.0
−0.5
≤
V
O
≤
V
CC
+ 0.5
I
IK
I
OK
DC Input Diode Current
DC Output Diode Current
−50
−50
+50
I
O
I
CC
I
GND
T
STG
DC Output Source/Sink Current
DC Supply Current Per Supply Pin
DC Ground Current Per Ground Pin
Storage Temperature Range
±50
±100
±100
−65 to +150
Output in 3−State
Output in HIGH or LOW State (Note 1)
V
I
< GND
V
O
< GND
V
O
> V
CC
Condition
Unit
V
V
V
V
mA
mA
mA
mA
mA
mA
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. I
O
absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
I
OH
Supply Voltage
Input Voltage
Output Voltage
HIGH Level Output Current
(HIGH or LOW State)
(3−State)
V
CC
= 3.0 V − 3.6 V
V
CC
= 2.7 V − 3.0 V
V
CC
= 2.3 V − 2.7 V
V
CC
= 3.0 V − 3.6 V
V
CC
= 2.7 V − 3.0 V
V
CC
= 2.3 V − 2.7 V
−40
0
Parameter
Operating
Data Retention Only
Min
2.0
1.5
0
0
0
Type
2.5, 3.3
2.5, 3.3
Max
3.6
3.6
5.5
V
CC
5.5
−24
−12
−8
+24
+12
+8
+85
10
Unit
V
V
V
mA
I
OL
LOW Level Output Current
mA
T
A
Dt/DV
Operating Free−Air Temperature
Input Transition Rise or Fall Rate, V
IN
from 0.8 V to 2.0 V,
V
CC
= 3.0 V
°C
ns/V
ORDERING INFORMATION
Device
MC74LCX257DR2
MC74LCX257DR2G
MC74LCX257DT
MC74LCX257DTR2
MC74LCX257M
MC74LCX257MEL
Package
SOIC−16
SOIC−16
(Pb−Free)
TSSOP−16*
TSSOP−16*
SOEIAJ−16
SOEIAJ−16
Shipping
†
2500 Tape & Reel
2500 Tape & Reel
96 Units / Rail
2500 Tape & Reel
48 Units / Rail
2000 Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*This package is inherently Pb−Free.
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3
MC74LCX257
DC ELECTRICAL CHARACTERISTICS
T
A
= −40°C to +85°C
Symbol
V
IH
Characteristic
HIGH Level Input Voltage (Note 2)
Condition
2.3 V
≤
V
CC
≤
2.7 V
2.7 V
≤
V
CC
≤
3.6 V
V
IL
LOW Level Input Voltage (Note 2)
2.3 V
≤
V
CC
≤
2.7 V
2.7 V
≤
V
CC
≤
3.6 V
V
OH
HIGH Level Output Voltage
2.3 V
≤
V
CC
≤
3.6 V; I
OH
= −100
mA
V
CC
= 2.3 V; I
OH
= −8 mA
V
CC
= 2.7 V; I
OH
= −12 mA
V
CC
= 3.0 V; I
OH
= −18 mA
V
CC
= 3.0 V; I
OH
= −24 mA
V
OL
LOW Level Output Voltage
2.3 V
≤
V
CC
≤
3.6 V; I
OL
= 100
mA
V
CC
= 2.3 V; I
OL
= 8 mA
V
CC
= 2.7 V; I
OL
= 12 mA
V
CC
= 3.0 V; I
OL
= 16 mA
V
CC
= 3.0 V; I
OL
= 24 mA
I
I
I
OZ
I
OFF
I
CC
Input Leakage Current
3−State Output Current
Power−Off Leakage Current
Quiescent Supply Current
2.3 V
≤
V
CC
≤
3.6 V; 0 V
≤
V
I
≤
5.5 V
2.3
≤
V
CC
≤
3.6 V; 0 V
≤
V
O
≤
5.5 V;
V
I
= V
IH
or V
IL
V
CC
= 0 V; V
I
or V
O
= 5.5 V
2.3
≤
V
CC
≤
3.6 V; V
I
= GND or V
CC
2.3
≤
V
CC
≤
3.6 V; 3.6
≤
V
I
or V
O
≤
5.5 V
DI
CC
Increase in I
CC
per Input
2.3
≤
V
CC
≤
3.6 V; V
IH
= V
CC
− 0.6 V
2. These values of V
I
are used to test DC electrical characteristics only.
V
CC
− 0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5
±5
10
10
±10
500
mA
mA
mA
mA
mA
V
Min
1.7
2.0
0.7
0.8
V
V
Max
Unit
V
AC CHARACTERISTICS
t
R
= t
F
= 2.5 ns; R
L
= 500
W
Limits
T
A
= −40°C to +85°C
V
CC
= 3.3 V
±
0.3 V
C
L
= 50 pF
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Parameter
Propagation Delay
In to Zn
Propagation Delay
S to Zn
Output Enable Time to
High and Low Level
Output Disable Time From
High and Low Level
Output−to−Output Skew
(Note 3)
3
3
1, 2
Waveform
1
Min
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max
6.0
6.0
7.0
7.0
7.0
7.0
5.5
5.5
1.0
1.0
V
CC
= 2.7 V
C
L
= 50 pF
Min
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max
6.5
6.5
8.5
8.5
8.5
8.5
6.0
6.0
V
CC
= 2.5 V
±
0.2 V
C
L
= 30 pF
Min
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max
7.2
7.2
9.1
9.1
9.1
9.1
6.6
6.6
ns
ns
ns
ns
Unit
ns
3. Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device.
The specification applies to any outputs switching in the same direction, either HIGH−to−LOW (t
OSHL
) or LOW−to−HIGH (t
OSLH
); parameter
guaranteed by design.
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4
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