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MC74VHC257 Datasheet

Quad 2-Channel Multiplexer

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MC74VHC257
Quad 2−Channel Multiplexer
with 3−State Outputs
The MC74VHC257 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 (OE) inputs. When (OE) 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 inputs tolerate voltages up to 7 V, allowing the interface of 5 V
systems to 3 V systems.
High Speed: tPD = 4.1 ns (Typ) at VCC = 5.0 V
Low Power Dissipation: ICC = 4.0 mA (Max) at TA = 25°C
High Noise Immunity: VNIH = VNIL = 28% VCC
Power Down Protection Provided on Inputs
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
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ESD Performance: HBM > 2000 V; Machine Model > 200 V
Chip Complexity: FETs = 100; Equivalent Gates = 25
S1
A0 2
B0 3
Y0 4
A1 5
B1 6
Y1 7
GND 8
16 VCC
15 OE
14 A3
13 B3
12 Y3
11 A2
10 B2
9 Y2
Figure 1. Pin Assignment
http://onsemi.com
MARKING DIAGRAMS
SO−16
D SUFFIX
CASE 751B
16 9
VHC257
AWLYWW
18
TSSOP−16
DT SUFFIX
CASE 948F
16 9
VHC257
ALYW
18
16 9
EIAJ SO−16
M SUFFIX
CASE 966
VHC257
ALYW
18
A
L, WL
Y
W, WW
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
Device
MC74VHC257D
MC74VHC257DR2
Package
SO−16
SO−16
Shipping
48 Units/Rail
2500 Tape & Reel
MC74VHC257DT TSSOP−16 96 Units/Rail
MC74VHC257DTR2 TSSOP−16 2500 Tape & Reel
MC74VHC257M EIAJSO−16 50 Units/Rail
MC74VHC257MEL EIAJSO−16 2000 Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2004
September, 2004 − Rev. 3
1
Publication Order Number:
MC74VHC257/D


  ON Semiconductor Electronic Components Datasheet  

MC74VHC257 Datasheet

Quad 2-Channel Multiplexer

No Preview Available !

OE I0a
MC74VHC257
I1a I0b
I1b I0c
I1c I0d
I1d S
Za Zb Zc
Figure 2. Expanded Logic Diagram
Zd
OE 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
FUNCTION TABLE
Inputs
OE S
Outputs
Y0 − Y3
HXZ
L L A0 −A3
L H B0 −B3
A0 − A3, B0 − B3 = the levels
of the respective Data−Word
Inputs.
This device contains protection
circuitry to guard against damage
due to high static voltages or electric
fields. However, precautions must
be taken to avoid applications of any
voltage higher than maximum rated
voltages to this high−impedance cir-
cuit. 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 MC74VHC257
Description Quad 2-Channel Multiplexer
Maker ON Semiconductor
Total Page 8 Pages
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