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74AC257 Datasheet(PDF) 1 Page - STMicroelectronics

No. de pieza 74AC257
Descripción Electrónicos  QUAD 2 CHANNEL MULTIPLEXER 3-STATE
PDF  11 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74AC257 Datasheet(HTML) 1 Page - STMicroelectronics

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1/11
April 2001
s
HIGH SPEED: tPD = 4.5ns (TYP.) at VCC = 5V
s
LOW POWER DISSIPATION:
ICC = 4µA(MAX.) at TA=25°C
s
HIGH NOISE IMMUNITY:
VNIH = VNIL = 28 % VCC (MIN.)
s
50
Ω TRANSMISSION LINE DRIVING
CAPABILITY
s
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24mA (MIN)
s
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
s
OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
s
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74AC257 is an advanced high-speed CMOS
QUAD 2-CHANNEL MULTIPLEXER (3-STATE)
fabricated
with
sub-micron silicon gate and
double-layer metal wiring C2MOS tecnology.
It is composed of four independent 2-channel
multiplexer with common SELECT and ENABLE
(OE) inputs. It is a non-inverting multiplexer. When
the OE input is held HIGH,all the output become in
high impedance state. If SELECT input is held
LOW, "A" data is selected, when SELECT input is
held HIGH, "B" data is chosen.
All
inputs
and
outputs
are
equipped
with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
74AC257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
DIP
74AC257B
SOP
74AC257M
74AC257MTR
TSSOP
74AC257TTR
TSSOP
DIP
SOP


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