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STMicroelectronics - QUAD 2 CHANNEL MULTIPLEXER 3-STATE

Numéro de référence 74ACT257M
Description QUAD 2 CHANNEL MULTIPLEXER 3-STATE
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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74ACT257M fiche technique
74ACT257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s HIGH SPEED: tPD =5 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 8 µA (MAX.) at TA = 25 oC
s COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN), VIL = 0.8V (MAX)
s 50TRANSMISSION LINE DRIVING
CAPABILITY
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24 mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 4.5V to 5.5V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
s IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The ACT257 is an advanced high-speed CMOS
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
It is ideal for low power applications mantaining
high speed operation similar to equivalent Bipolar
Schottky TTL.
These IC’s are composed of an independent 2
channel multiplexer with common SELECT and
PIN CONNECTION AND IEC LOGIC SYMBOLS
BM
(Plastic Package)
(Micro Package)
ORDER CODES :
74ACT257B
74ACT257M
ENABLE INPUT.
The AC257 is a non inverting multiplexer.
When the ENABLE INPUT is held ”High” outputs
of both IC’s become high impedance state. If
SELECT INPUT is held ”Low”, ”A” data is
selected, when SELECT INPUT is ”High”, ”B”
data is closen.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
April 1997
1/10

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