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  ON Semiconductor Electronic Components Datasheet  

MC74VHCT157A Datasheet

Quad 2-Channel Multiplexer

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MC74VHCT157A
Quad 2−Channel Multiplexer
The MC74VHCT157A is an advanced high speed CMOS quad
2−channel multiplexer fabricated with silicon gate CMOS technology.
It achieves high speed operation similar to equivalent Bipolar
Schottky TTL while maintaining CMOS low power dissipation.
It consists of four 2−input digital multiplexers with common select
(S) and enable (E) inputs. When E is held High, selection of data is
inhibited and all the outputs go Low.
The select decoding determines whether the A or B inputs get routed
to the corresponding Y outputs.
The VHCT inputs are compatible with TTL levels. This device can
be used as a level converter for interfacing 3.3 V to 5.0 V because it
has full 5.0 V CMOS level output swings.
The VHCT157A input structures provide protection when voltages
between 0 V and 5.5 V are applied, regardless of the supply voltage.
The output structures also provide protection when VCC = 0 V. These
input and output structures help prevent device destruction caused by
supply voltage−input/output voltage mismatch, battery backup, hot
insertion, etc.
The inputs tolerate voltages up to 7.0 V, allowing the interface of
5.0 V systems to 3.0 V systems.
Features
High Speed: tPD = 4.1 ns (Typ) at VCC = 5.0 V
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Low Power Dissipation: ICC = 4 mA (Max) at TA = 25°C
TTL−Compatible Inputs: VIL = 0.8 V; VIH = 2.0 V
Power Down Protection Provided on Inputs and Outputs
Balanced Propagation Delays
Designed for 2.0 V to 5.5 V Operating Range
Low Noise: VOLP = 0.8 V (Max)
Pin and Function Compatible with Other Standard Logic Families
Latchup Performance Exceeds 300 mA
ESD Performance:
Human Body Model > 2000 V;
Machine Model > 200 V
Chip Complexity: 82 FETs or 20 Equivalent Gates
Pb−Free Packages are Available*
http://onsemi.com
MARKING
DIAGRAMS
16
SOIC−16
D SUFFIX
CASE 751B
VHCT157AG
AWLYWW
11
16
TSSOP−16
VHCT
DT SUFFIX
157A
CASE 948F
ALYWG
G
11
16
SOEIAJ−16
M SUFFIX
CASE 966
74VHCT157
ALYWG
11
A = Assembly Location
WL, L = Wafer Lot
Y = Year
WW, W = Work Week
G or G = Pb−Free Package
(Note: Microdot may be in either location)
FUNCTION TABLE
Inputs
ES
HX
LL
LH
Outputs
Y0 − Y3
L
A0 −A3
B0 −B3
A0 − A3, B0 − B3 = the levels of
the respective Data−Word Inputs.
*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
December, 2005 − Rev. 2
1
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
Publication Order Number:
MC74VHCT157A/D


  ON Semiconductor Electronic Components Datasheet  

MC74VHCT157A Datasheet

Quad 2-Channel Multiplexer

No Preview Available !

MC74VHCT157A
S1
A0 2
B0 3
Y0 4
A1 5
B1 6
Y1 7
GND 8
16 VCC
15 E
14 A3
13 B3
12 Y3
11 A2
10 B2
9 Y2
Figure 1. Pin Assignment
NIBBLE
INPUTS
E
S
2
A0
3
B0
A1 5
B1 6
11
A2
10
B2
A3 14
B3 13
15
1
4 Y0
7
Y1
9 Y2
DATA
OUTPUTS
12 Y3
Figure 2. Expanded Logic Diagram
E 15
S1
A0 2
B0 3
A1 5
B1 6
A2 11
B2 10
A3 14
B3 13
EN
G1
1 MUX
1
4 Y0
7 Y1
9 Y2
12 Y3
Figure 3. IEC Logic Symbol
This device contains protection circuitry to
guard against damage due to high static
voltages or electric fields. However, pre-
cautions must be taken to avoid applications
of any voltage higher than maximum rated
voltages to this high−impedance circuit. For
proper operation, Vin and Vout should be
constrained to the range GND v (Vin or Vout)
v VCC.
Unused inputs must always be tied to an
appropriate logic voltage level (e.g., either
GND or VCC). Unused outputs must be left
open.
http://onsemi.com
2


Part Number MC74VHCT157A
Description Quad 2-Channel Multiplexer
Maker ON Semiconductor
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