7.9

2

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

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

PIN DESCRIPTION

Pin Names

Description

OE

Output Enable Input (Active LOW)

T/

R

Transmit/Receive Input

Side A Inputs or 3-State Outputs

Side B Inputs or 3-State Outputs

2534 tbl 05

FUNCTION TABLE

(2)

Inputs

OE

OE

T/

RR

Outputs

L

L

Bus B Data to Bus A

(1)

L

H

Bus A Data to Bus B

(1)

H

X

High Z State

NOTES:

2534 tbl 06

1. 640 is inverting from input to output.

2. H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol

Rating

Commercial

Military

Unit

–0.5 to +7.0

–0.5 to +7.0

V

with Respect

to GND

V

with Respect

to GND

Operating

0 to +70

–55 to +125

°C

Temperature

Temperature

–55 to +125

–65 to +135

°C

Under Bias

Storage

–55 to +125

–65 to +150

°C

Temperature

Power Dissipation

0.5

0.5

W

DC Output Current

120

120

mA

NOTES:

2534 tbl 01

1. Stresses greater than those listed under ABSOLUTE MAXIMUM

RATINGS may cause permanent damage to the device. This is a stress

rating only and functional operation of the device at these or any other

conditions above those indicated in the operational sections of this

specification is not implied.

Exposure to absolute maximum rating

conditions for extended periods may affect reliability. No terminal voltage

3. Outputs and I/O terminals.

°C, f = 1.0MHz)

Symbol

Parameter

(1)

Conditions

Typ. Max. Unit

Input Capacitance

6

10

pF

I/O Capacitance

8

12

pF

NOTE:

2534 tbl 02

1. This parameter is measured at characterization but not tested.