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74VHCT257AMTR Scheda tecnica(PDF) 1 Page - STMicroelectronics

Il numero della parte 74VHCT257AMTR
Spiegazioni elettronici  QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHCT257AMTR Scheda tecnica(HTML) 1 Page - STMicroelectronics

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December 2004
s
HIGH SPEED: tPD = 4.8 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
POWER DOWN PROTECTION ON INPUTS
& OUTPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 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
s
LOW NOISE: VOLP = 0.8V (MAX.)
DESCRIPTION
The 74VHCT257A 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 composed of four independent 2-channel
multiplexers with common SELECT and ENABLE
INPUT(OE). The VHCT257A is a non-inverting
multiplexer. When the ENABLE INPUT is held
"High", all outputs become high impedance state.
If SELECT INPUT is held "Low", "A" data is
selected, when SELECT INPUT is "High", "B" data
is chosen.
Power down protection is provided on all inputs
and outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V since all
inputs are equipped with TTL threshold.
All
inputs
and
outputs
are
equipped
with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
74VHCT257A
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
Figure 1: Pin Connection And IEC Logic Symbols
Table 1: Order Codes
PACKAGE
T & R
SOP
74VHCT257AMTR
TSSOP
74VHCT257ATTR
TSSOP
SOP
Rev. 3


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