Integrated Device Technology, Inc.

MILITARY AND COMMERCIAL TEMPERATURE RANGES

MAY 1992

©1992 Integrated Device Technology, Inc.

7.9

DSC-4201/3

®

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FAST is a registered trademark of National Semiconductor Co.

DIP/SOIC/CERPACK

TOP VIEW

FAST CMOS OCTAL

BIDIRECTIONAL

TRANSCEIVERS

IDT54/74FCT245/A/C

IDT54/74FCT640/A/C

IDT54/74FCT645/A/C

FEATURES:

• IDT54/74FCT245/640/645 equivalent to FAST

™ speed

and drive

• IDT54/74FCT245A/640A/645A 25% faster than FAST

• IDT54/74FCT245C/640C/645C 40% faster than FAST

• TTL input and output level compatible

• CMOS output level compatible

• Input current levels only 5

µA max.

• CMOS power levels (2.5mW typical static)

• Direction control and over-riding 3-state control

• Product available in Radiation Tolerant and Radiation

Enhanced versions

• Military product compliant to MIL-STD-883, Class B and

DESC listed

• Meets or exceeds JEDEC Standard 18 specifications

DESCRIPTION:

The IDT octal bidirectional transceivers are built using an

advanced dual metal CMOS technology.

The IDT54/

74FCT245/A/C, IDT54/74FCT640/A/C and IDT54/74FCT645/

A/C are designed for asynchronous two-way communication

between data buses. The transmit/receive (T/

R) input deter-

mines 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 IDT54/74FCT245/A/C and IDT54/74FCT645/A/C

transceivers have non-inverting outputs. The IDT54/

74FCT640/A/C has inverting outputs.

FUNCTIONAL BLOCK DIAGRAM

PIN CONFIGURATIONS

2534 drw 02

A

0

T/R

OE

A

1

A

2

A

3

A

4

A

5

A

6

A

7

5

6

7

8

9

10

1

2

3

4

20

19

18

17

16

15

14

13

Vcc

12

11

T/R

OE

GND

P20-1

D20-1

SO20-2

&

E20-1

2534 drw 01

INDEX

15

14

18

17

16

5

6

7

8

9

10 11 12

1

4

32

20

13

19

L20-2

LCC

TOP VIEW

NOTES:

1. FCT245, 645 are noninverting options.

2. FCT640 is the inverting option.

1