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74LCX646 Datasheet(PDF) 2 Page - STMicroelectronics

Part No. 74LCX646
Description  LOW VOLT. CMOS OCTAL BUS TRANSCEIVER/REGISTER WITH 5 VOLT TOLERANT INPUTS AND OUTPUTS(3-STATE)
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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74LCX646 Datasheet(HTML) 2 Page - STMicroelectronics

 
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M74LCX646
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(enable G high), "A" data may be stored in one
register and/or "B" data may be stored in the other
register. When an output function is disabled, the
input function is still enabled and may be used to
store and transmit data. Only one of the two
buses, A or B, may be driven at a time. It has
same speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power
consumption.
All
inputs
and
outputs
are
equipped
with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1
CLOCK AB (CAB)
A to B Clock Input (LOW to HIGH,
Edge-Triggered)
2
SELECT AB (SAB)
Select A to B Source Input
3
DIR
Direction Control Input
4, 5, 6, 7, 8, 9, 10, 11
A1 to A8
A Data Inputs/Outputs
20, 19, 18, 17, 16, 15, 14, 13
B1 to B8
B Data Inputs/Outputs
21
G
Output Enable Input (Active LOW)
22
SELECT BA (SBA)
Select B to A Source Input
23
CLOCK BA (CBA)
B to A Clock Input (LOW to HIGH,
Edge Triggered)
12
GND
Ground (0V)
24
VCC
Positive Supply Voltage


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