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74ACT257B Fiches technique(PDF) 1 Page - STMicroelectronics

No de pièce 74ACT257B
Description  QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74ACT257B Fiches technique(HTML) 1 Page - STMicroelectronics

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April 2001
s
HIGH SPEED: tPD = 5 ns (TYP.) at VCC = 5V
s
LOW POWER DISSIPATION:
ICC = 4 µA(MAX.) at TA=25°C
s
COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN.), VIL = 0.8V (MAX.)
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) = 4.5V to 5.5V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
s
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74ACT257 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 an independent 2-channel
multiplexer with common SELECT and ENABLE
(OE)inputs. It is a non-inverting multiplexer. When
the ENABLE input is held HIGH, the outputs are
forced to a high impedance state. When the
SELECT input is held LOW, "A" data is selected;
when
SELECT input is held HIGH, "B" data is
selected.
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.
74ACT257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
DIP
74ACT257B
SOP
74ACT257M
74ACT257MTR
TSSOP
74ACT257TTR
TSSOP
DIP
SOP


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