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PS2099A 02/13/97

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PI74LCX245

Fast CMOS 3.3V 8-Bit

Bidirectional Transceiver

Product Features

• Functionally compatible with FCT3, LVT, and 74 series

245 families of products

• Tri-State outputs

• 5V Tolerant inputs and outputs

• Balanced sink and source output drives (24 mA)

• Low ground bounce 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)

Product Description

Pericom Semiconductor’s PI74LCX series of logic circuits are

produced in 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

Note:

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

L = Low Voltage Level, Z = High Impedance

s

t

u

p

n

I

)

1

(

s

t

u

p

t

u

O

)

1

(

E

OR

/

T

LL

A

s

u

B

o

t

a

t

a

D

B

s

u

B

LH

B

s

u

B

o

t

a

t

a

D

A

s

u

B

HX

Z

e

t

a

t

S

h

g

i

H

20-PIN

H20

L20

Q20

S20

e

m

a

N

n

i

Pn

o

i

t

p

i

r

c

s

e

D

OE

e

l

b

a

n

E

t

u

p

t

u

O

e

t

a

t

S

-

3

)

W

O

L

e

v

i

t

c

A

(

s

t

u

p

n

I

R

/

Tt

u

p

n

I

l

o

r

t

n

o

C

n

o

i

t

c

e

r

i

D

7

A

-

0

Ar

o

s

t

u

p

n

I

A

e

d

i

S

s

t

u

p

t

u

O

e

t

a

t

S

-

3

7

B

-

0

Br

o

s

t

u

p

n

I

B

e

d

i

S

s

t

u

p

t

u

O

e

t

a

t

S

-

3

D

N

Gd

n

u

o

r

G

r

e

w

o

P

OE

T/R

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