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

•IOL = 64mA (commercial) and 48mA (military)

• Input current levels only 5µA 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/ ) 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 ( ) 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

T/R

Vcc

T/R

GND B7

P20-1

D20-1

SO20-2

E20-1

2534 drw 01

INDEX

GND

Vcc

T/R

10 11 12

L20-2

LCC

TOP VIEW

NOTES:

1. FCT245, 645 are noninverting options.

2. FCT640 is the inverting option.

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

Output Enable Input (Active LOW)

T/ Transmit/Receive Input

0–A7 Side A Inputs or 3-State Outputs

0–B7 Side B Inputs or 3-State Outputs

2534 tbl 05

FUNCTION TABLE

(2)

Inputs

T/ 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

TERM

(2)

Terminal Voltage –0.5 to +7.0 –0.5 to +7.0 V

with Respect

to GND

TERM

(3)

Terminal Voltage –0.5 to VCC –0.5 to VCC V

with Respect

to GND

A Operating 0 to +70 –55 to +125 °C

Temperature

BIAS Temperature –55 to +125 –65 to +135 °C

Under Bias

STG Storage –55 to +125 –65 to +150 °C

Temperature

T Power Dissipation 0.5 0.5 W

OUT 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

may exceed V

CC by +0.5V unless otherwise noted.

2. Inputs and V

CC terminals.

3. Outputs and I/O terminals.

CAPACITANCE (TA = +25°C, f = 1.0MHz)

Symbol Parameter

(1)

Conditions Typ. Max. Unit

IN Input Capacitance VIN = 0V 6 10 pF

I/O I/O Capacitance VOUT = 0V 8 12 pF

NOTE: 2534 tbl 02

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

7.9 3

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

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS MILITARY AND COMMERCIAL TEMPERATURE RANGES

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified: VLC = 0.2V; VHC = VCC – 0.2V

Commercial: TA = 0°C to +70°C, VCC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%

Symbol Parameter Test Conditions

(1)

Min. Typ.

(2)

Max. Unit

IH Input HIGH Level Guaranteed Logic HIGH Level 2.0 — — V

IL Input LOW Level Guaranteed Logic LOW Level — — 0.8 V

IH Input HIGH Current VCC = Max VI = VCC ——5µA

(Except I/O pins) V

I = 2.7V — — 5

(4)

IIL Input LOW Current VI = 0.5V — — –5

(4)

(Except I/O pins) VI = GND — — –5

IH Input HIGH Current VCC = Max VI = VCC ——15µA

(I/O pins only) V

I = 2.7V — — 15

(4)

IIL Input LOW Current VI = 0.5V — — –15

(4)

(I/O pins only) VI = GND — — –15

IK Clamp Diode Voltage VCC = Min., IN = –18mA — –0.7 –1.2 V

OS Short Circuit Current VCC = Max.

(3)

, VO = GND –60 –120 — mA

OH Output HIGH Voltage VCC = 3V, VIN = VLC or VHC, IOH = –32µAVHC VCC —V

CC = Min. IOH = –300µAVHC VCC —

IN = VIH or VIL IOH = –12mA MIL. 2.4 4.3 —

OH = –15mA COM’L. 2.4 4.3 —

OL Output LOW Voltage VCC = 3V, VIN = VLC or VHC, IOL = 300µA — GND VLC V

(Port A and Port B) V

CC = Min. IOL = 300µA — GND VLC

(4)

VIN = VIH or VIL IOL = 48mA MIL. — 0.3 0.55

OL = 64mA COM’L. — 0.3 0.55

NOTES: 2534 tbl 03

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at V

CC = 5.0V, +25°C ambient and maximum loading.

3. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.

4. This parameter is guaranteed but not tested.

Part #	54FCT645DB
Description
Category	IC
Availability	Out of Stock
Qty	0

54FCT645DB

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