PI74LCX245 Просмотр технического описания (PDF) - Pericom Semiconductor Corporation

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PI74LCX245

Fast CMOS 3.3V 8-Bit Bidirectional Transceiver

Pericom Semiconductor Corporation 

PI74LCX245

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Fast CMOS 3.3V 8-Bit Bidirectional Transceiver

Product Features

Product Description

• Functionally compatible with FCT3, LVT, and 74 series

245 families of products

• Tri-State outputs

• 5V Tolerant inputs and outputs

• 2.0V-3.6V VCC supply operation

• Balanced sink and source output drives (24 mA)

• Low ground bounce outputs

• Power Down High Impedance inputs and outputs

• Supports live insertion

• ESD Protection exceeds 2000V, Human Body Model

200V, Machine Model

• Packages available:

– 20-pin 209-mil wide plastic SSOP (H)

– 20-pin 173-mil wide plastic TSSOP (L)

– 20-pin 150-mil wide plastic QSOP (Q)

– 20-pin 300-mil wide plastic SOIC (S)

Pericom Semiconductor’s PI74LCX series of logic circuits are

produced using the Company’s advanced 0.6 micron CMOS

technology achieving high speed while maintaining low power

operation.

The PI74LCX245 is an 8-bit bidirectional transceiver designed for

asynchronous two-way communication between data buses.

The transmit/receive input pin (T/R) determines the direction of data

flow through the bidirectional transceiver. Transmit (active HIGH)

enables data from A ports to B ports, and receive (active LOW) from

B ports to A ports. The output enable (OE) input, when HIGH,

disables both A and B ports by placing them in HIGH Z condition.

The PI74LCX245 can be driven from either 3.3V or 5.0V devices

allowing this device to be used as a translator in a mixed 3.3V/5.0V

system.

Logic Block Diagram

Product Pin Configuration Product Pin Description

T/R

OE

Pin Name Description

OE

3-State Output Enable

Inputs (Active LOW)

A0

20-Pin

T/R

Direction Control Input

B0

H20

L20

A0-A7 Side A Inputs or

A1

Q20

3-State Outputs

B1

S20

B0-B7 Side B Inputs or

A2

3-State Outputs

B2

A3

GND Ground

B3

VCC

Power

A4

Truth Table(1)

B4

1A5

Inputs(1)

B5

OE

T/R

Outputs(1)

A6

B6

L

L

Bus B Data to Bus A

A7

L

H

Bus A Data to Bus B

B7

H

X

High State Z

Note:

1. H = High Voltage Level, X = Don’t Care,

L = Low Voltage Level, Z = High Impedance

1

PS2099B 11/17/02

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