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74LCX257 Datasheet دیتاشیت PDF دانلود

دیتاشیت - National Semiconductor - Low-Voltage Quad 2-Input Multiplexer

شماره قطعه 74LCX257
شرح مفصل Low-Voltage Quad 2-Input Multiplexer
تولید کننده National Semiconductor 
آرم National Semiconductor 


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74LCX257 شرح
December 1996
74LCX257
Low-Voltage Quad 2-Input Multiplexer
with 5V Tolerant Inputs and Outputs
General Description
The LCX257 is a quad 2-input multiplexer with TRI-STATE
outputs Four bits of data from two sources can be selected
using a Common Data Select input The four outputs pres-
ent the selected data in true (noninverted) form The out-
puts may be switched to a high impedance state by placing
a logic HIGH on the common Output Enable (OE) input
allowing the outputs to interface directly with bus-oriented
systems
The 74LCX257 is fabricated with advanced CMOS technol-
ogy to achieve high speed operation while maintaining
CMOS low power dissipation
Features
Y 5V tolerant inputs and outputs
Y 6 5 ns tPD max 10 mA ICCQ max
Y Power down high impedance inputs and outputs
Y Supports live insertion withdrawal
Y 2 0V – 3 6V VCC supply operation
Y g24 mA output drive
Y Implements patented Quiet SeriesTM noise EMI reduc-
tion circuitry
Y Functionally compatible with 74 series 257
Y Latch-up performance exceeds 500 mA
Y ESD performance
Human body model l 2000V
Machine model l 200V
Logic Symbols
Connection Diagram
IEEE IEC
Pin Assignment for
SOIC and TSSOP
TL F 12466–1
TL F 12466 – 2
Pin Names
S
OE
I0a – I0d
I1a – I1d
Za – Zd
Description
Common Data Select Input
TRI-STATE Output Enable Input
Data Inputs from Source 0
Data Inputs from Source 1
TRI-STATE Multiplexer Outputs
Order Number
See NS Package Number
SOIC JEDEC
74LCX257M
74LCX257MX
M16A
SOIC EIAJ
74LCX257SJ
74LCX257SJX
M16D
TSSOP
74LCX257MTC
74LCX257MTCX
MTC16
TL F 12466 – 3
TRI-STATE is a registered trademark of National Semiconductor Corporation
Quiet SeriesTM is a trademark of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL F 12466
RRD-B30M17 Printed in U S A
http www national com

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