74LCX646(2004) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

74LCX646
(Rev.:2004)

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

STMicroelectronics 

M74LCX646

(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

Figure 2: Input And Output Equivalent Circuit

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.

Table 2: Pin Description

PIN N°

1

2

3

4, 5, 6, 7, 8, 9, 10, 11

20, 19, 18, 17, 16, 15, 14, 13

21

22

23

12

24

SYMBOL

CLOCK AB (CAB)

SELECT AB (SAB)

DIR

A1 to A8

B1 to B8

G

SELECT BA (SBA)

CLOCK BA (CBA)

GND

VCC

NAME AND FUNCTION

A to B Clock Input (LOW to HIGH,

Edge-Triggered)

Select A to B Source Input

Direction Control Input

A Data Inputs/Outputs

B Data Inputs/Outputs

Output Enable Input (Active LOW)

Select B to A Source Input

B to A Clock Input (LOW to HIGH,

Edge Triggered)

Ground (0V)

Positive Supply Voltage

2/16

Share Link: