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74VHCT257ATTR Folha de dados(PDF) 1 Page - STMicroelectronics

Nome de Peças 74VHCT257ATTR
Descrição Electrónicos  QUAD 2 CHANNEL MULTIPLEXER 3-STATE
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHCT257ATTR Folha de dados(HTML) 1 Page - STMicroelectronics

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74VHCT257A
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
PRELIMINARY DATA
March 2000
s
HIGH SPEED: tPD = 5.8 ns (TYP.) at VCC =5V
s
LOWPOWER DISSIPATION:
ICC =4
µA (MAX.) at TA =25 oC
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
LOWNOISE: 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
C
2MOS
technology.
It is composed of four independent 2 channel
multiplexers with common SELECT and ENABLE
INPUT.
The 74VHCT257A 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 output 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.
All inputs
and
outputs are
equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
®
SOP
TSSOP
ORDER CODES
PACKAGE
T UBE
T & R
SOP
74VHCT257AM
74VHCT257AMTR
TSSOP
74VHCT257ATTR
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