74LCX646 datasheet(2/16 Pages) STMICROELECTRONICS

Part #	74LCX646

Description	LOW VOLT. CMOS OCTAL BUS TRANSCEIVER/REGISTER WITH 5 VOLT TOLERANT INPUTS AND OUTPUTS(3-STATE)

PDF	16 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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2 / 16 page

M74LCX646

2/16

(enable G high), "A" data may be stored in one

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.

Figure 2: Input And Output Equivalent Circuit

Table 2: Pin Description

PIN N°

SYMBOL

NAME AND FUNCTION

CLOCK AB (CAB)

A to B Clock Input (LOW to HIGH,

Edge-Triggered)

SELECT AB (SAB)

Select A to B Source Input

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

Output Enable Input (Active LOW)

SELECT BA (SBA)

Select B to A Source Input

CLOCK BA (CBA)

B to A Clock Input (LOW to HIGH,

Edge Triggered)

GND

Ground (0V)

VCC

Positive Supply Voltage

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