background image

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

• I

OL

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

• Input current levels only 5

µ

A 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

B

0

0

T/R

OE

A

B

1

1

A

B

2

2

A

B

3

3

A

B

4

4

A

B

5

5

A

B

6

6

A

B

7

7

5

6

7

8

9

10

A

1

A

2

A

3

1

2

3

4

20

19

18

17

16

15

14

13

Vcc

12

11

T/R

B

1

A

4

A

5

A

6

A

7

OE

B

2

B

3

B

4

B

5

B

6

GND

B

7

A

0

B

0

P20-1

D20-1

SO20-2

&

E20-1

2534 drw 01

INDEX

B

0

B

1

B

2

B

3

B

4

A

2

A

3

A

4

A

5

A

6

B

7

B

6

B

GND

A

7

A

0

A

1

Vcc

T/R

OE

15

14

5

18

17

16

5

6

7

8

9

10 11 12

1

4

3

2

20

13

19

L20-2

LCC

TOP VIEW

NOTES:

1. FCT245, 645 are noninverting options.

2. FCT640 is the inverting option.

1

background image

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

A

0

–A

7

Side A Inputs or 3-State Outputs

B

0

–B

7

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

V

TERM

(2)

Terminal Voltage

 –0.5 to +7.0

 –0.5 to +7.0

V

with Respect

to GND

V

TERM

(3)

Terminal Voltage

 –0.5 to V

CC

 –0.5 to V

CC

V

with Respect

to GND

T

A

Operating

 0 to +70

 –55 to +125

°

C

Temperature

T

BIAS

Temperature

 –55 to +125

 –65 to +135

°

C

Under Bias

T

STG

Storage

 –55 to +125

 –65 to +150

°

C

Temperature

P

T

Power Dissipation

0.5

0.5

W

I

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 

(T

A

 = +25

°

C, f = 1.0MHz)

 Symbol

Parameter

(1)

Conditions

Typ. Max. Unit

C

IN

Input Capacitance

V

IN

 = 0V

6

10

pF

C

I/O

I/O Capacitance

V

OUT

 = 0V

8

12

pF

NOTE:

2534  tbl  02

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

background image

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: V

LC

 = 0.2V; V

HC

  = V

CC 

– 0.2V

Commercial: T

A

 = 0

°

C to +70

°

C, V

CC

 = 5.0V 

±

 5%; Military: T

A

 = –55

°

C to +125

°

C, V

CC

 = 5.0V 

±

 10%

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

V

IH

Input HIGH Level

Guaranteed Logic HIGH Level

2.0

V

V

IL

Input LOW Level

Guaranteed Logic LOW Level

0.8

V

I

IH

Input HIGH Current

V

CC 

= Max

V

= V

CC

5

µ

A

(Except I/O pins)

V

= 2.7V

5

(4)

I

IL

Input LOW Current

V

= 0.5V

–5

(4)

(Except I/O pins)

V

= GND

–5

I

IH

Input HIGH Current

V

CC 

= Max

V

=  V

CC

15

µ

A

(I/O pins only)

V

=  2.7V

15

(4)

I

IL

Input LOW Current

V

=  0.5V

–15

(4)

(I/O pins only)

V

=  GND

–15

V

IK

Clamp Diode Voltage

V

CC 

= Min., I

N

 = –18mA

–0.7

–1.2

V

I

OS

Short Circuit Current

V

CC 

= Max.

(3)

, V

O

 = GND

–60

–120

mA

V

OH

Output HIGH Voltage

V

CC 

= 3V, V

IN

 = V

LC

 or V

HC

, I

OH

 = –32

µ

A

V

HC

V

CC

V

V

CC 

= Min.

I

OH

  = –300

µ

A

V

HC

V

CC

V

IN

 = V

IH 

or V

IL

I

OH

  = –12mA MIL.

2.4

4.3

I

OH

  = –15mA COM’L.

2.4

4.3

V

OL

Output LOW Voltage

V

CC 

= 3V, V

IN

 = V

LC

 or V

HC

, I

OL 

= 300

µ

A

GND

V

LC

V

(Port A and Port B)

V

CC 

= Min.

I

OL 

= 300

µ

A

GND

V

LC

(4)

V

IN

 = V

IH 

or V

IL

I

OL 

= 48mA MIL.

0.3

0.55

I

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.

background image

7.9

4

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

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

V

LC

 = 0.2V; V

HC

 = V

CC

 – 0.2V

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

I

CC

Quiescent Power Supply Current

Vcc = Max.

0.5

1.5

mA

V

IN

 

 V

HC

; V

IN

 

 V

LC

I

CC

Quiescent Power Supply Current

Vcc = Max.

0.5

2.0

mA

TTL Inputs HIGH

V

IN

 = 3.4V

(3)

I

CCD

Dynamic Power Supply Current

(4)

Vcc = Max.

V

IN

 

 V

HC

0.15

0.25

mA/MHz

Outputs Open

V

IN

 

 V

LC

OE

 = GND

T/

R

 = GND or V

CC

One Input Toggling

50% Duty Cycle

I

C

Total Power Supply Current

(6)

Vcc = Max.

V

IN

 

 V

HC

2.0

4.0

mA

Outputs Open

V

IN

 

 V

LC

f

 = 10MHz

(FCT)

50% Duty Cycle

V

IN

  = 3.4V

2.3

5.0

T/

R

 = 

OE

 = GND

V

IN

  = GND

One Bit Toggling

Vcc = Max.

V

IN

 

 V

HC

3.5

6.5

(5)

Outputs Open

V

IN

 

 V

LC

f

= 2.5MHz

(FCT)

50% Duty Cycle

V

IN

  = 3.4V

5.5

14.5

(5)

T/

R

 = 

OE

 = GND

V

IN

  = GND

Eight Bits Toggling

NOTES:

2534 tbl 04

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.

3. Per TTL driven input (V

IN

 = 3.4V); all other inputs at V

CC

 or GND.

4. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.

5. Values for these conditions are examples of the I

CC

 formula.  These limits are guaranteed but not tested.

6. I

C

 = I

QUIESCENT

 + I

INPUTS 

+ I

DYNAMIC

I

C

 = I

CC

 + 

I

CC

 D

H

N

T

 + I

CCD

 (f

CP

/2 + f

i

N

i

)

I

CC

 = Quiescent Current

I

CC

 = Power Supply Current for a TTL High Input (V

IN

 = 3.4V)

D

H

 = Duty Cycle for TTL Inputs High

N

= Number of TTL Inputs at D

H

I

CCD 

= Dynamic Current Caused by an Output Transition Pair (HLH or LHL)

f

CP 

= Clock Frequency for Register Devices (Zero for Non-Register Devices)

f

i

 = Input Frequency

N

i

 = Number of Inputs at f

i

All currents are in milliamps and all frequencies are in megahertz.

background image

7.9

5

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

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

  t

PLH

Propagation Delay

C

L

 = 50 pF

1.5

7.0

1.5

7.5

1.5

4.6

1.5

4.9

1.5

4.1

1.5

4.5

ns

  t

PHL

A to B, B to A

R

L

 = 500

  t

PZH

Output Enable Time

1.5

9.5

1.5

10.0

1.5

6.2

1.5

6.5

1.5

5.8

1.5

6.2

ns

  t

PZL

OE

 to A or B

  t

PHZ

Output Disable Time

1.5

7.5

1.5

10.0

1.5

5.0

1.5

6.0

1.5

4.8

1.5

5.2

ns

  t

PLZ

OE

 to A or B

  t

PZH

Output EnableTime

1.5

9.5

1.5

10.0

1.5

6.2

1.5

6.5

1.5

5.8

1.5

6.2

ns

  t

PZL

T/

R

 to A or B

(3)

  t

PHZ

Output Disable Time

1.5

7.5

1.5

10.0

1.5

5.0

1.5

6.0

1.5

4.8

1.5

5.2

ns

  t

PLZ

T/

R

 to A or B

(3)

2534  tbl 07

SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT245/A/C

54/74FCT245

54/74FCT245A

54/74FCT245C

Com’l.

Mil.

Com’l.

Mil.

Com’l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max.

Min.

(2)

Max. Min

.

(2)

Max.

Unit

  t

PLH

Propagation Delay

C

L

 = 50 pF

2.0

7.0

2.0

8.0

1.5

5.0

1.5

5.3

1.5

4.4

1.5

4.7

ns

  t

PHL

A to B, B to A

R

L

 = 500

  t

PZH

Output Enable Time

2.0

13.0

2.0

16.0

1.5

6.2

1.5

6.5

1.5

5.8

1.5

6.2

ns

  t

PZL

OE

 to A or B

  t

PHZ

Output Disable Time

2.0

10.0

2.0

12.0

1.5

5.0

1.5

6.0

1.5

4.8

1.5

5.2

ns

  t

PLZ

OE

 to A or B

  t

PZH

Output Enable Time

2.0

13.0

2.0

16.0

1.5

6.2

1.5

6.5

1.5

5.8

1.5

6.2

ns

  t

PZL

T/

R

 to A or B

(3)

  t

PHZ

Output Disable Time

2.0

10.0

2.0

12.0

1.5

5.0

1.5

6.0

1.5

4.8

1.5

5.2

ns

  t

PLZ

T/

R

 to A or B

(3)

2534  tbl 08

SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT640/A/C

54/74FCT640

54/74FCT640A

54/74FCT640C

Com’l.

Mil.

Com’l.

Mil.

Com’l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max.

Min.

(2)

Max. Min

.

(2)

Max.

Unit

SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT645/A/C

54/74FCT645

54/74FCT645A

54/74FCT645C

Com’l.

Mil.

Com’l.

Mil.

Com’l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max.

Min.

(2)

Max. Min

.

(2)

Max.

Unit

  t

PLH

Propagation Delay

C

L

 = 50 pF

1.5

9.5

1.5

11.0

1.5

4.6

1.5

4.9

1.5

4.1

1.5

4.5

ns

  t

PHL

A to B, B to A

R

L

 = 500

  t

PZH

Output Enable Time

1.5

11.0

1.5

12.0

1.5

6.2

1.5

6.5

1.5

5.8

1.5

6.2

ns

  t

PZL

OE

 to A or B

  t

PHZ

Output Disable Time

1.5

12.0

1.5

13.0

1.5

5.0

1.5

6.0

1.5

4.8

1.5

5.2

ns

  t

PLZ

OE

 to A or B

  t

PZH

Output Enable Time

1.5

11.0

1.5

12.0

1.5

6.2

1.5

6.5

1.5

5.8

1.5

6.2

ns

  t

PZL

T/

R

 to A or B

(3)

  t

PHZ

Output Disable Time

1.5

12.0

1.5

13.0

1.5

5.0

1.5

6.0

1.5

4.8

1.5

5.2

ns

  t

PLZ

T/

R

 to A or B

(3)

NOTES:

2534  tbl 09

1. See test circuit and waveforms.

2. Minimum limits are guaranteed but not tested on Propagation Delays.

3. This parameter is guaranteed but not tested.

background image

7.9

6

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

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

TEST CIRCUITS AND WAVEFORMS

TEST CIRCUITS FOR ALL OUTPUTS

ENABLE AND DISABLE TIMES

PROPAGATION DELAY

SET-UP, HOLD AND RELEASE TIMES

PULSE WIDTH

Pulse

Generator

DATA

INPUT

TIMING 

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

PRESET

CLEAR

CLOCK ENABLE

ETC.

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

t

SU

t

H

t

REM

H

t

SU

R

T

D.U.T.

V

CC

V

IN

C

L

V

OUT

50pF

500

500

7.0V

SAME PHASE

INPUT TRANSITION

3V

1.5V

0V

1.5V

V

OH

V

OL

t

PLH

t

PHL

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

CONTROL

INPUT

3V

1.5V

0V

3.5V

0V

OUTPUT

NORMALLY

LOW

OUTPUT

NORMALLY

HIGH

SWITCH

CLOSED

SWITCH

OPEN

V

OL

V

OH

3V

1.5V

0V

t

PLH

t

PHL

0.3V

0.3V

t

PLZ

t

PZL

t

PZH

t

PHZ

3.5V

0V

1.5V

1.5V

ENABLE

DISABLE

HIGH-LOW-HIGH

PULSE

LOW-HIGH-LOW

PULSE

t

W

1.5V

1.5V

t

NOTES

2534 drw 04

1. Diagram shown for input Control Enable-LOW and input Control

Disable-HIGH.

2. Pulse Generator for All Pulses: Rate 

 1.0 MHz; Z

O

 

 50

; t

F

 

 2.5ns;

t

R

 

 2.5ns.

SWITCH POSITION

Test

Switch

Open Drain

Disable Low

Closed

Enable Low

All Other Tests

Open

DEFINITIONS:

2534 tbl 08

C

L

 = Load capacitance: includes jig and probe capacitance.

R

T

 = Termination resistance: should be equal to Z

OUT

 of the Pulse

Generator.

background image

7.9

7

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

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

ORDERING INFORMATION

XX

X

Package

X

Process

Blank

B

Commercial 

MIL-STD-883, Class B

P

D

SO

L

E

Plastic DIP

CERDIP

Small Outline IC

Leadless Chip Carrier

CERPACK

245

640

645

245A

640A

645A

245C

640C

645C

Non-Inverting Buffer Transceiver

Octal Inverting Buffer Transceiver

Non-Inverting Buffer Transceiver

Fast Non-Inverting Buffer Transceiver

Fast Octal Inverting Buffer Transceiver

Fast Non-Inverting Buffer Transceiver

Super Fast Non-Inverting Buffer Transceiver

Super Fast Octal Inverting Buffer Transceiver

Super Fast Non-Inverting Buffer Transceiver 

X

Device

Type

2534 drw 03

–55

°

C to +125

°

C

0

°

C to +70

°

C

54

74

Temperature 

Range

FCT

IDT