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PS8097 03/25/97

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PI74LPT2Q245

Fast CMOS 3.3V 8-Bit Bidirectional Transceiver

Product Description

Pericom Semiconductor’s PI74LPT 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 PI74LPT2Q245 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 PI74LPT2Q245 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

L20

Q20

R20

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

Product Features

• Compatible with LCX™ and LVT™ families of products

• Supports 5V Tolerant Mixed Signal Mode Operation

– Input can be 3V or 5V

– Output can be 3V or connected to 5V bus

• Advanced Low Power CMOS Operation

• Excellent output drive capability:

Balanced drives (12 mA sink and source)

•33

Ω Series Resistors on all outputs

• Low ground bounce outputs

• Hysteresis on all inputs

• Industrial operating temperature range: –40°C to +85°C

• Packages available:

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

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

– 20-pin 150 mil wide plastic TQSOP (R)

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

OE

T/R

1