1

PS8149B

12/10/99

120

219

1

1

318

2

2

417

1

1

516

2

2

615

1

1

714

2

2

813

1

1

912

2

2

10

11

GND

Product Description

PericomSemiconductor’sPI3Cseriesoflogiccircuitsareproduced

using the Company’s advanced submicron CMOS technology,

achieving industry leading performance.

The PI3C3244 features a set of 2.5V or 3.3V 8-bit bus switches,

which is a pinout and function compatible with the P74FCT244T,

74F244, and 74ALS/AS/LS2448-bit drivers. Two enable signals

(BEn) turn the switches on similar to the enable signals of the 244.

The bus switch create no additional propagation delay or ground

bounce noise. It is very useful in switching signals that have high

bandwidth(>400MHz).

Note:

1. H = High Voltage Level

L = Low Voltage Level

Logic Block Diagram

Product Pin Description

Pin Name

Description

BEn

Bus Enable Input (Active LOW)

A0–7

Bus A

B0–7

Bus B

GND

Ground

Power

Product Pin Configuration

PI3C3244

2.5V/3.3V, High Bandwidth, Hot Insertion,

8-Bit, 2-Port Bus Switch

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Product Features

• Near zero propagation delay

• HighBandwidth(>400MHz)

• Rail-to-Rail3.3Vor2.5VSwitching

• 5VI/OTolerant

• 2.5VSupplyVoltageOperation

• Permits Hot Insertion

• Pin compatible with 74 series 244 logic devices

• Packagesavailable:

–20-pin150milwideplasticQSOP(Q)

–20-pin173milwideplasticTSSOP(L)

20-Pin

L,Q

1

E

B2

E

BB

1

,

A

1B

2

,

A

2

HH

t

c

e

n

n

o

c

si

Dt

c

e

n

n

o

c

si

D

LH

B

1

=

A

1t

c

e

n

n

o

c

si

D

HL

t

c

e

n

n

o

c

si

DB

2

=

A

2

LL

B

1

=

A

1B

2

=

A

2

*-

)

*

)