1

PS8121A

07/21/97

Logic Block Diagram

Description

Pericom Semiconductor’s PI74FCT3 series of logic circuits are

produced in the Company’s advanced 0.6 micron CMOS technology,

achieving industry leading speed grades.

The PI74FCT3573 is an 8-bit transparent latch designed with

3-state outputs and is intended for bus oriented applications. When

Latch Enable (LE) is HIGH, the flip-flops appear transparent to

the data. The data that meets the set-up time when LE is LOW is

latched. When OE is HIGH, the bus output is in the high impedance

state.

The PI74FCT3573 can be driven from either 3.3V or 5.0V devices

allowing this device to be used as a translator in a mixed

3.3/5.0V system.

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012

PI74FCT3573

Fast CMOS 3.3V 8-Bit

Transparent Latch

Pinout

Inputs

(1)

Outputs

(1)

LE

OE

HH

L

H

LH

L

L

XX

H

Z

Truth Table

Note:

1. H = High Voltage Level

X = Don’t Care

L = Low Voltage Level

Z = High Impedance

Pin Description

Pin Name

Description

OE

Output Enable Input (Active LOW)

LE

Latch Enable Input (Active HIGH)

D7-D0

Data Inputs

O7-O0

3-State Outputs

GND

Ground

Power

Features

• Advanced Low Power CMOS Operation

• Compatible with LVC class of products

• Compatible with industry standard octal pinouts

• Excellent output drive capability:

Balanced drives (24 mA sink and source)

• Can serve as a 5V to 3V translator

• Inputs can be driven by 3.3V or 5V devices

• 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 (L20)

– 20-pin 150 mil wide plastic QSOP (Q20)

– 20-pin 150 mil wide plastic TQSOP (R20)

– 20-pin 300 mil wide plastic SOIC (S20)

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

Vcc

O0

O1

O2

O3

O4

O5

O6

O7

LE

OE

D0

D1

D2

D3

D4

D5

D6

D7

GND

20-Pin

L20

R20

Q20

S20

OE

LE

G

D

TO 7 OTHER CHANNELS

O