background image

Integrated Device Technology, Inc.

MILITARY AND COMMERCIAL TEMPERATURE RANGES

AUGUST 1995

©

1995 Integrated Device Technology, Inc.

6.9

DSC-4611/4

1

DESCRIPTION:

The IDT octal bidirectional transceivers are built using an

advanced dual metal CMOS technology.  The FCT245T/

FCT2245T, FCT640T and FCT645T are designed for asyn-

chronous two-way communication between data buses.  The

transmit/receive (T/

R

) input determines 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 FCT245T/FCT2245T and FCT645T transceivers have

non-inverting outputs.  The FCT640T has inverting outputs.

The FCT2245T has balanced drive outputs with current

limiting resistors.  This offers low ground bounce, minimal

undershoot and controlled output fall times- reducing the need

for external series terminating resistors.  The FCT2xxxT parts

are plug-in replacements for FCTxxxT parts.

FAST CMOS OCTAL

BIDIRECTIONAL

TRANSCEIVERS

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT

IDT54/74FCT640T/AT/CT

IDT54/74FCT645T/AT/CT/DT

FEATURES:

• Common features:

Low input and output leakage 

1

µ

A (max.)

CMOS power levels

True TTL input and output compatibility

– V

OH

 = 3.3V (typ.)

– V

OL

 = 0.3V (typ.)

Meets or exceeds JEDEC standard 18 specifications

Product available in Radiation Tolerant and Radiation

Enhanced versions

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

and DESC listed (dual marked)

Available in DIP, SOIC, SSOP, QSOP, CERPACK

and LCC packages

• Features for FCT245T/FCT640T/FCT645T:

Std., A, C and D speed grades

High drive outputs  (-15mA I

OH

, 64mA I

OL

)

• Features for FCT2245T:

Std., A and C speed grades

Resistor outputs

(-15mA I

OH

, 12mA I

OL

 Com.)

(-12mA I

OH

, 12mA I

OL

 Mil.)

Reduced system switching noise

2539 drw 01

PIN CONFIGURATIONS

FUNCTIONAL BLOCK DIAGRAM

2539 drw 02

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

LCC

TOP VIEW

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

SO20-7*

SO20-8**

&

E20-1

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

4

L20-2

9 10 11 12 13

3

2

1

20 19

*FCT245T/2245T, FCT645T only.

**FCT245T/2245T, FCT640T

DIP/SOIC/SSOP/QSOP/CERPACK

TOP VIEW

FCT245T/2245T, FCT645T are non-inverting options.

FCT640T is the inverting options.

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

2539 drw 03

background image

6.9

2

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

FUNCTION TABLE

(2)

2539 tbl 01

2539 tbl 02

NOTES:

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)

CAPACITANCE

 (TA = +25

°

C, F = 1.0MHZ)

Symbol

Rating

Commercial

Military

Unit

V

TERM(2)

Terminal Voltage

with Respect to

GND

–0.5 to +7.0

–0.5 to +7.0

V

V

TERM(3)

Terminal Voltage

with Respect to

GND

–0.5 to

V

CC 

+0.5

–0.5 to

V

CC 

+0.5

V

T

A

Operating

Temperature

0 to +70

–55 to +125

°

C

T

BIAS

Temperature

Under Bias

–55 to +125

–65 to +135

°

C

T

STG

Storage

Temperature

–55 to +125

–65 to +150

°

C

P

T

Power Dissipation

0.5

0.5

W

I

OUT

DC Output

Current

–60 to +120    –60 to +120    mA

NOTES:

1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-

INGS 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. Input and V

CC

 terminals only.

3. Outputs and I/O terminals only.

2539 lnk 03

Symbol

Parameter

(1)

Conditions

Typ.

Max. Unit

C

IN

Input  

Capacitance

V

IN

  = 0V

6

10

pF

C

OUT

Output  

Capacitance

V

OUT 

= 0V

8

12

pF

2539 lnk 04

NOTE:

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

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

Inputs

OE

OE

T/

RR

Outputs

L

L

Bus B Data to Bus A

(1)

L

H

Bus B Data to Bus B

(1)

H

X

High Z State

background image

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.9

3

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

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

I H

Input HIGH Current

(4)

V

CC

 = Max.

V

I

 = 2.7V

±

1

µ

A

I

I L

Input LOW Current

(4)

  

V

I

 = 0.5V

±

1

I

OZH

High Impedance Output Current

V

CC

 = Max.

V

= 2.7V

±

1

µ

A

I

OZL

(3-State Output pins)

(4)

V

O

 = 0.5V

±

1

I

 

Input HIGH Current

(4)

V

CC

 = Max., V

= V

CC 

(Max.)

±

1

µ

A

V

IK

Clamp Diode Voltage

V

CC

 = Min., I

IN  

= –18mA

–0.7

–1.2

V

V

H

Input Hysteresis

                                         —

200

mV

I

CC

Quiescent Power Supply Current

V

CC

 = Max., V

IN

 = GND or V

CC

0.01

1

mA

OUTPUT DRIVE CHARACTERISTICS FOR FCT245T/640T/645T

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

 

Unit

V

OH

Output HIGH Voltage

V

CC

 = Min.

V

IN

 = V

IH 

or V

IL

I

OH

 = –6mA MIL.

I

OH

 = –8mA COM'L.  

2.4

3.3

V

I

OH

 = –12mA MIL.

I

OH

 = –15mA COM'L.

2.0

3.0

V

V

OL

Output LOW Voltage

V

CC

 = Min.

V

IN

 = V

IH 

or V

IL

I

OL 

= 48mA MIL.

I

OL 

= 64mA COM'L.

0.3

0.55

V

I

OS

Short Circuit Current

V

CC

 = Max., V

O

 = GND

(3)

–60

–120

–225

mA

OUTPUT DRIVE CHARACTERISTICS FOR FCT2245T

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

 

Unit

I

ODL

Output LOW Current

V

CC

 = 5V, V

IN 

= V

IH 

or

 

V

IL,  

V

OUT 

= 1.5V

(3)

16

48

mA

I

ODH

Output HIGH Current

V

CC

 = 5V, V

IN 

= V

IH 

or V

   IL,

V

OUT 

= 1.5V

(3)

–16

–48

mA

V

OH

Output HIGH Voltage

V

CC

 = Min.

V

IN

 = V

IH 

or 

 

V

IL

I

OH

 = –12mA MIL.

I

OH

 = –15mA COM'L.

2.4

3.3

V

V

OL

Output LOW Voltage

V

CC

 = Min.

V

IN

 = V

IH 

or V

IL

I

OL

 = 12mA

0.3

0.50

V

2539 lnk 05

2539 lnk 06

2539 lnk 07

NOTES:

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 Vcc = 5.0V, +25

°

C ambient.

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

4. The test limit for this parameter is 

±

5

µ

A at T

A

 = –55

°

C.

background image

6.9

4

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

NOTES:

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

T

 = Number of TTL Inputs at D

H

I

CCD

 = Dynamic Current Caused by an Input 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.

2539 tbl 08

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

I

CC

Quiescent Power Supply Current

TTL Inputs HIGH

V

CC

 = Max.

V

IN 

= 3.4V

(3)

0.5

2.0

mA

I

CCD

Dynamic Power Supply  

Current

(4)

V

CC

 = Max.

Outputs Open

V

IN

 = V

CC

V

IN

 = GND

FCTxxxT

0.15

0.25

mA/

MHz

OE

 = T/

R

 = GND   

One Input Toggling

50% Duty Cycle

FCT2xxxT

0.06

0.12

I

C

Total Power Supply Current

(6)

V

CC

 = Max.

V

IN

 = V

CC

FCTxxxT

1.5

3.5

mA

Outputs Open

fi = 10MHz

V

IN

 = GND FCT2xxxT

0.6

2.2

50% Duty Cycle

V

IN

 = 3.4

FCTxxxT

1.8

4.5

OE

 = T/

R

 = GND   

One Bit Toggling

V

IN

 = GND FCT2xxxT

0.9

3.2

V

CC

 = Max.

V

IN

 = V

CC

FCTxxxT

3.0

6.0

(5)

Outputs Open

fi = 2.5MHz

V

IN

 = GND FCT2xxxT

1.2

3.4

(5)

50% Duty Cycle

V

IN

 = 3.4

FCTxxxT

5.0

14.0

(5)

OE

 = T/

R

 = GND  

Eight Bits Toggling

V

IN

 = GND FCT2xxxT

3.2

11.4

(

5)

background image

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.9

5

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

2534  tbl 09

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

2534  tbl 10

FCT245T

FCT2245T

FCT245AT

FCT2245AT

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Conditions

(1)

Min.

(2)

Max.

Min

.

(2)

Max.

Min

.

(2)

Max.

Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay

A to B, B to A

C

L

 = 50 pF

R

L

 = 500

1.5

7.0

1.5

7.5

1.5

4.6

1.5

4.9

ns

t

PZH

t

PZL

Output Enable Time

OE

 to A or B

1.5

9.5

1.5

10.0

1.5

6.2

1.5

6.5

ns

t

PHZ

t

PLZ

Output Disable Time

OE

 to A or B

1.5

7.5

1.5

10.0

1.5

5.0

1.5

6.0

ns

t

PZH

t

PZL

Output Enable Time

T/

R

 to A or B

(3)

1.5

9.5

1.5

10.0

1.5

6.2

1.5

6.5

ns

t

PHZ

t

PLZ

Output Disable Time

T/

R

 to A or B

(3)

1.5

7.5

1.5

10.0

1.5

5.0

1.5

6.0

ns

FCT245CT

FCT2245CT

FCT245DT

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Conditions

(1)

Min.

(2)

Max.

Min

.

(2)

Max.

Min

.

(2)

Max.

Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay

A to B, B to A

C

L

 = 50 pF

R

L

 = 500

1.5

4.1

1.5

4.5

1.5

3.8

ns

t

PZH

t

PZL

Output Enable Time

OE

 to A or B

1.5

5.8

1.5

6.2

1.5

5.0

ns

t

PHZ

t

PLZ

Output Disable Time

OE

 to A or B

1.5

4.8

1.5

5.2

1.5

4.3

ns

t

PZH

t

PZL

Output Enable Time

T/

R

 to A or B

(3)

1.5

5.8

1.5

6.2

1.5

5.0

ns

t

PHZ

t

PLZ

Output Disable Time

T/

R

 to A or B

(3)

1.5

4.8

1.5

5.2

1.5

4.3

ns

FCT640T

FCT640AT

FCT640CT

Com'l.

Mil.

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Conditions

(1)

Min

.

(2)

Max. Min.

(2)

Max. Min

.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay

A to B, B to A

C

L

 = 50 pF

R

L

 = 500

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

PZH

t

PZL

Output Enable Time

OE

 to A or B

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

PHZ

t

PLZ

Output Disable Time

OE

 to A or B

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

PZH

t

PZL

Output Enable Time

T/

R

 to A or B

(3)

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

PHZ

t

PLZ

Output Disable Time

T/

R

 to A or B

(3)

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

NOTES:

2534  tbl 11

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

6.9

6

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

FCT645T

FCT645AT

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Conditions

(1)

Min.

(2)

Max.

Min

.

(2)

Max.

Min

.

(2)

Max.

Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay

A to B, B to A

C

L

 = 50 pF

R

L

 = 500

1.5

9.5

1.5

11.0

1.5

4.6

1.5

4.9

ns

t

PZH

t

PZL

Output Enable Time

OE

 to A or B

1.5

11.0

1.5

12.0

1.5

6.2

1.5

6.5

ns

t

PHZ

t

PLZ

Output Disable Time

OE

 to A or B

1.5

12.0

1.5

13.0

1.5

5.0

1.5

6.0

ns

t

PZH

t

PZL

Output Enable Time

T/

R

 to A or B

(3)

1.5

11.0

1.5

12.0

1.5

6.2

1.5

6.5

ns

t

PHZ

t

PLZ

Output Disable Time

T/

R

 to A or B

(3)

1.5

12.0

1.5

13.0

1.5

5.0

1.5

6.0

ns

2534  tbl 12

FCT645CT

FCT645DT

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Conditions

(1)

Min.

(2)

Max.

Min

.

(2)

Max.

Min

.

(2)

Max.

Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay

A to B, B to A

C

L

 = 50 pF

R

L

 = 500

1.5

4.1

1.5

4.5

1.5

3.8

ns

t

PZH

t

PZL

Output Enable Time

OE

 to A or B

1.5

5.8

1.5

6.2

1.5

5.0

ns

t

PHZ

t

PLZ

Output Disable Time

OE

 to A or B

1.5

4.8

1.5

5.2

1.5

4.3

ns

t

PZH

t

PZL

Output Enable Time

T/

R

 to A or B

(3)

1.5

5.8

1.5

6.2

1.5

5.0

ns

t

PHZ

t

PLZ

Output Disable Time

T/

R

 to A or B

(3)

1.5

4.8

1.5

5.2

1.5

4.3

ns

NOTES:

2534  tbl 13

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

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.9

7

TEST CIRCUITS AND WAVEFORMS

TEST CIRCUITS FOR ALL OUTPUTS

SET-UP, HOLD AND RELEASE TIMES

PULSE WIDTH

SWITCH POSITION

Pulse

Generator

R

T

D.U.T.

V

CC

V

IN

C

L

V

OUT

50pF

500

500

7.0V

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

DATA

INPUT

TIMING 

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

t

SU

t

H

t

REM

t

SU

t

H

HIGH-LOW-HIGH

PULSE

LOW-HIGH-LOW

PULSE

t

W

1.5V

1.5V

SAME PHASE

INPUT TRANSITION

3V

1.5V

0V

1.5V

V

OH

t

PLH

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

3V

1.5V

0V

t

PLH

t

PHL

t

PHL

V

OL

CONTROL

INPUT

3V

1.5V

0V

3.5V

0V

OUTPUT

NORMALLY

LOW

OUTPUT

NORMALLY

HIGH

SWITCH

CLOSED

SWITCH

OPEN

V

OL

0.3V

0.3V

t

PLZ

t

PZL

t

PZH

t

PHZ

3.5V

0V

1.5V

1.5V

ENABLE

DISABLE

V

OH

PRESET

CLEAR

CLOCK ENABLE

ETC.

ENABLE AND DISABLE TIMES

PROPAGATION DELAY

NOTES:

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

HIGH

2. Pulse Generator for All Pulses: Rate 

 1.0MHz; t

F

 

 2.5ns; t

R

 

 2.5ns

Test

Switch

Disable Low

Enable Low

Closed

All Other Tests

Open

Open Drain

DEFINITIONS:

C

L

=

Load capacitance: includes jig and probe capacitance.

R

=

Termination resistance: should be equal to Z

OUT 

of the Pulse

Generator.

2534 drw 04

2534 drw 05

2534 drw 06

2534 drw 07

2534 drw 08

2534 lnk 14

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6.9

8

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT

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

PY

Q

Plastic DIP

CERDIP

Small Outline IC

Leadless Chip Carrier

CERPACK

Shrink Small Outline Package

Quarter-size Small Outline Package

245T

640T

645T

245AT

640AT

645AT

245CT

640CT

645CT

245DT

645DT

Non-Inverting Octal Bidirectional Transceiver

Inverting Octal Bidirectional Transceiver

Non-Inverting Octal Bidirectional Transceiver

X

Device

Type

High Drive

Balanced Drive

Blank

2

Temperature

Range

FCT

IDT

–55

°

C to +125

°

C

0

°

C to +70

°

C

54

74

Family

X

2539 drw 09