MC74VHCT257A_04 Datasheet, PDF (1/8 Pages) ON Semiconductor – Quad 2-Channel Multiplexer with 3-State Outputs

MC74VHCT257A
Quad 2−Channel Multiplexer
with 3−State Outputs
The MC74VHCT257A 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 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 V CMOS level output swings.
The VHCT257A 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 V_CC = 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 internal circuit is composed of three stages, including a buffered
output which provides high noise immunity and stable output. The inputs
tolerate voltages up to 7 V, allowing the interface of 5 V systems to 3 V
systems.
• High Speed: t_PD = 4.1 ns (Typ) at V_CC = 5.0 V
• Low Power Dissipation: I_CC = 4.0 mA (Max) at T_A = 25°C
• TTL−Compatible Inputs: V_IL = 0.8 V; V_IH = 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: V_OLP = 0.8 V (Max)
• Pin and Function Compatible with Other Standard Logic Families
• Latchup Performance Exceeds 300 mA
• ESD Performance: HBM > 2000 V; Machine Model > 200 V
S1
A0 2
B0 3
Y0 4
A1 5
B1 6
Y1 7
GND 8
16 V_CC
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
VHCT257A
AWLYWW
1
8
TSSOP−16
DT SUFFIX
CASE 948F
16
9
VHCT257A
ALYW
1
8
EIAJ SO−16
M SUFFIX
CASE 966
16
9
VHCT257A
ALYW
1
8
A
L, WL
Y
W, WW
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
Device
MC74VHCT257AD
Package
SO−16
Shipping^†
48 Units/Rail
MC74VHCT257ADR2 SO−16 2500 Tape & Reel
MC74VHCT257ADT TSSOP−16 96 Units/Rail
MC74VHCT257ADTR2 TSSOP−16 2500 Tape & Reel
MC74VHCT257AM EIAJSO−16 50 Units/Rail
MC74VHCT257AMEL 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
1
September, 2004 − Rev. 2
Publication Order Number:
MC74VHCT257A/D