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74VHC245 fiches techniques PDF

STMicroelectronics - OCTAL BUS TRANSCEIVER 3-STATE

Numéro de référence 74VHC245
Description OCTAL BUS TRANSCEIVER 3-STATE
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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74VHC245 fiche technique
®
s HIGH SPEED: tPD = 4.0 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s POWER DOWN PROTECTION ON CONTROL
INPUTS
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (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 245
s IMPROVED LATCH-UP IMMUNITY
s LOW NOISE VOLP = 0.9V (Max.)
DESCRIPTION
The 74VHC245 is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
This IC is intended for two-way asynchronous
communication between data busses; the
direction of data trasmission is determined by the
level of the DIR input. The enable input G can be
PIN CONNECTION AND IEC LOGIC SYMBOLS
74VHC245
OCTAL BUS
TRANSCEIVER (3-STATE)
PRELIMINARY DATA
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHC245M
74VHC245T
used to disable the device so that the busses are
effectively isolated.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2kV ESD immunity and transient excess
voltage.
IT IS PROHIBITED TO APPLY A SIGNAL TO A
TERMINAL WHEN IT IS IN OUTPUT MODE
AND WHEN A BUS TERMINAL IS FLOATING
(HIGH IMPEDANCE STATE) IT IS REQUESTED
TO FIX THE INPUT LEVEL BY MEANS OF
EXTERNAL PULL DOWN OR PULL UP
RESISTOR.
June 1999
1/8

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