74LCX257 MULTIPLEXER Datasheet

74LCX257 Datasheet, PDF, Equivalent


Part Number

74LCX257

Description

LOW VOLTAGE CMOS QUAD 2-CHANNEL MULTIPLEXER

Manufacture

STMicroelectronics

Total Page 13 Pages
Datasheet
Download 74LCX257 Datasheet


74LCX257
74LCX257
LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER
WITH 5V TOLERANT INPUTS AND OUTPUTS (3-STATE)
s 5V TOLERANT INPUTS AND OUTPUTS
s HIGH SPEED:
tPD = 6.0 ns (MAX.) at VCC = 3V
s POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
)s SYMMETRICAL OUTPUT IMPEDANCE:
t(s|IOH| = IOL = 24mA (MIN) at VCC = 3V
cs PCI BUS LEVELS GUARANTEED AT 24 mA
SOP
TSSOP
us BALANCED PROPAGATION DELAYS:
rodtPLH tPHL
s OPERATING VOLTAGE RANGE:
PVCC(OPR) = 2.0V to 3.6V (1.5V Data
teRetention)
Table 1: Order Codes
PACKAGE
SOP
TSSOP
T&R
74LCX257MTR
74LCX257TTR
les PIN AND FUNCTION COMPATIBLE WITH
o74 SERIES 257
ss LATCH-UP PERFORMANCE EXCEEDS
b500mA (JESD 17)
Os ESD PERFORMANCE:
-HBM > 2000V (MIL STD 883 method 3015);
t(s)MM > 200V
It is composed of four independent 2 channel
multiplexers with common SELECT and ENABLE
(OE) INPUT. The 74LCX257 is a non-inverting
multiplexer. When the ENABLE INPUT is held
"High", all outputs become in high impedance
state. If SELECT INPUT is held "Low", "A" data is
cDESCRIPTION
duThe 74LCX257 is a low voltage CMOS QUAD 2
roCHANNEL MULTIPLEXER (3-STATE) fabricated
with sub-micron silicon gate and double-layer
Pmetal wiring C2MOS technology. It is ideal for low
tepower and high speed 3.3V applications; it can be
leinterfaced to 5V signal environment for both inputs
and outputs.
selected, when SELECT INPUT is "High", "B" data
is chosen.
It has same speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power
consumption.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
ObsoFigure 1: Pin Connection And IEC Logic Symbols
September 2004
Rev. 4
1/13

74LCX257
74LCX257
Figure 2: Input And Output Equivalent Circuit
roduct(s)Table 2: Pin Description
PPIN N°
te1
le2, 5, 11, 14
o3, 6, 10, 13
s4, 7, 9, 12
b15
- O8
)16
t(sTable 3: Truth Table
SYMBOL
SELECT
1A to 4A
1B to 4B
1Y to 4Y
OE
GND
VCC
roducOE
PH
teL
leL
oL
sL
ObX : Don’t Care
SELECT
X
L
L
H
H
INPUTS
A
X
L
H
X
X
NAME AND FUNCTION
Common Data Select Inputs
Data Inputs From Source A
Data Inputs From Source B
3 State Multiplexer Outputs
3 State Output Enable Inputs (Active LOW)
Ground (0V)
Positive Supply Voltage
OUTPUT
BY
XZ
XL
XH
LL
HH
Z : High Impedance
2/13


Features 74LCX257 LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER WITH 5V TOLERANT INPUTS AN D OUTPUTS (3-STATE) s 5V TOLERANT INPU TS AND OUTPUTS s HIGH SPEED: tPD = 6. 0 ns (MAX.) at VCC = 3V s POWER DOWN P ROTECTION ON INPUTS AND OUTPUTS )s SY MMETRICAL OUTPUT IMPEDANCE: t(s|IOH| = IOL = 24mA (MIN) at VCC = 3V cs PCI BUS LEVELS GUARANTEED AT 24 mA SOP TSSOP us BALANCED PROPAGATION DELAYS: rodtP LH ≅ tPHL s OPERATING VOLTAGE RANGE: PVCC(OPR) = 2.0V to 3.6V (1.5V Data teR etention) Table 1: Order Codes PACKAGE SOP TSSOP T&R 74LCX257MTR 74LCX257TTR les PIN AND FUNCTION COMPATIBLE WITH o74 SERIES 257 ss LATCH-UP PERFORMANCE EXCEEDS b500mA (JESD 17) Os ESD PERFORM ANCE: -HBM > 2000V (MIL STD 883 method 3015); t(s)MM > 200V It is composed of four independent 2 channel multiplexer s with common SELECT and ENABLE (OE) IN PUT. The 74LCX257 is a non-inverting mu ltiplexer. When the ENABLE INPUT is hel d "High", all outputs become in high im pedance state. If SELECT INPUT is held "Low", "A" data is cDESCR.
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