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74VHC257 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. 74VHC257
Description  QUAD 2 CHANNEL MULTIPLEXER 3-STATE
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHC257 Datasheet(HTML) 1 Page - STMicroelectronics

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November 2004
s
HIGH SPEED: tPD = 3.7ns (TYP.) at VCC = 5V
s
LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA=25°C
s
HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s
POWER DOWN PROTECTION ON INPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8mA (MIN)
s
BALANCED PROPAGATION DELAYS:
tPLH tPHL
s
OPERATING VOLTAGE RANGE:
VCC(OPR) = 2V 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 74VHC257 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
(OE) INPUT. The VHC257 is a non-inverting
multiplexer. When the ENABLE INPUT is held
"High", all outputs become in 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 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.
74VHC257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
Figure 1: Pin Connection And IEC Logic Symbols
Table 1: Order Codes
PACKAGE
T & R
SOP
74VHC257MTR
TSSOP
74VHC257TTR
TSSOP
SOP
Rev. 4


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