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74VHC245 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. 74VHC245
Description  OCTAL BUS TRANSCEIVER 3-STATE
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHC245 Datasheet(HTML) 1 Page - STMicroelectronics

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74VHC245
OCTAL BUS
TRANSCEIVER (3-STATE)
PRELIMINARY DATA
June 1999
ORDER CODES :
74VHC245M
74VHC245T
M
(Micro Package)
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 C
2MOS 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
T
(TSSOP Package)
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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
®
1/8


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