Datasheet IDT54FCT245T, IDT54FCT245AT, IDT54FCT245CT, IDT54FCT245DT, IDT54FCT640T Datasheet (Integrated Device Technology)

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FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVERS

Integrated Device Technology, Inc.

FEATURES:

• Common features:

– Low input and output leakage ≤1µA (max.)
– CMOS power levels
– True TTL input and output compatibility

– VOH = 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 IOH, 64mA IOL)

• Features for FCT2245T:

– Std., A and C speed grades
– Resistor outputs (-15mA IOH, 12mA IOL Com.)

(-12mA IOH, 12mA IOL Mil.)

– Reduced system switching noise

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

IDT54/74FCT640T/AT/CT

IDT54/74FCT645T/AT/CT/DT

DESCRIPTION:

The IDT octal bidirectional transceivers are built using an
advanced dual metal CMOS technology. The FCT245T/
FCT2245T, FCT640T and FCT645T are designed for asyn­chronous 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.

FUNCTIONAL BLOCK DIAGRAM

T/R

OE

0

A

0

B

1

A

1

B

2

A

2

B

3

A

3

B

4

A

4

B

5

A

B

5

6

A

B

6

7

A

B

7

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

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

FCT640T is the inverting options.

2539 drw 01

PIN CONFIGURATIONS

T/R

GND B7

DIP/SOIC/SSOP/QSOP/CERPACK

INDEX

1
2

A0

3

A1

A2
A3
A4
A5
A6
A7

*FCT245T/2245T, FCT645T only.

**FCT245T/2245T, FCT640T

A2

A3

A4

A5

A6

4

SO20-2

5

SO20-7*

6

SO20-8**

7
8
9

10

TOP VIEW

1

32

4
5
6
7
8

10 11 12 13

9

7

A

TOP VIEW

P20-1
D20-1

E20-1

L20-2

LCC

&

A0A

1

GND

20
19
18
17
16
15
14
13
12
11

Vcc

T/R

20 19

B7B6B

OE

18
17
16
15
14

5

Vcc
OE
B0
B
B2
B3
B4
B5
B6

B0
B1
B2
B3
B4

1

2539 drw 02

2539 drw 03

MILITARY AND COMMERCIAL TEMPERATURE RANGES AUGUST 1995

1995 Integrated Device Technology, Inc. 6.9 DSC-4611/4

1

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

PIN DESCRIPTION

Pin Names Description

OE

T/

R

A0-A

7

B0-B

7

ABSOLUTE MAXIMUM RATINGS

Symbol Rating Commercial Military Unit

(2)

VTERM

VTERM

TA Operating

TBIAS Temperature

TSTG Storage

PT Power Dissipation 0.5 0.5 W
IOUT DC Output

NOTES:

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

2. Input and V

3. Outputs and I/O terminals only.

Terminal Voltage
with Respect to
GND

(3)

Terminal Voltage
with Respect to
GND

Temperature

Under Bias

Temperature

Current

CC by +0.5V unless otherwise noted.

CC terminals only.

Output Enable Input (Active LOW)
Transmit/Receive Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs

(1)

–0.5 to +7.0 –0.5 to +7.0 V

–0.5 to

CC +0.5

V

–0.5 to

VCC +0.5

0 to +70 –55 to +125 °C

–55 to +125 –65 to +135 °C

–55 to +125 –65 to +150 °C

–60 to +120 –60 to +120 mA

2539 tbl 01

V

2539 lnk 03

FUNCTION TABLE

(2)

Inputs

OE

OE

L L Bus B Data to Bus A
L H Bus B Data to Bus B

T/

R

R

Outputs

(1)
(1)

H X High Z State

NOTES:

1. 640 is inverting from input to output.

2. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care

CAPACITANCE (TA = +25°C, F = 1.0MHZ)

Symbol Parameter

CIN Input

Capacitance

COUT Output

Capacitance

NOTE:

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

(1)

Conditions Typ. Max. Unit

VIN = 0V 6 10 pF

VOUT = 0V 8 12 pF

2539 tbl 02

2539 lnk 04

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

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:
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.

VIH Input HIGH Level Guaranteed Logic HIGH Level 2.0 — — V
VIL Input LOW Level Guaranteed Logic LOW Level — — 0.8 V
II H Input HIGH Current
II L Input LOW Current

(4)

(4)

VI = 0.5V — — ±1

VCC = Max. VI = 2.7V — — ±1 µA

IOZH High Impedance Output Current VCC = Max. VO = 2.7V — — ±1 µA

(4)

(4)

VO = 0.5V — — ±1

VCC = Max., VI = VCC (Max.) — — ±1 µA

IOZL (3-State Output pins)
II Input HIGH Current
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V
VH Input Hysteresis — — 200 — mV
ICC Quiescent Power Supply Current VCC = Max., VIN = GND or VCC — 0.01 1 mA

(2)

Max. Unit

2539 lnk 05

OUTPUT DRIVE CHARACTERISTICS FOR FCT245T/640T/645T

Symbol Parameter Test Conditions

VOH Output HIGH Voltage VCC = Min.

IN = VIH or VIL

V

IOH = –6mA MIL.

OH = –8mA COM'L.

I
IOH = –12mA MIL.

OH = –15mA COM'L.

I

VOL Output LOW Voltage VCC = Min.

IN = VIH or VIL

V

IOS Short Circuit Current VCC = Max., VO = GND

IOL = 48mA MIL.

OL = 64mA COM'L.

I

(3)

(1)

Min. Typ.

2.4 3.3 — V

2.0 3.0 — V

— 0.3 0.55 V

–60 –120 –225 mA

(2)

Max. Unit

2539 lnk 06

OUTPUT DRIVE CHARACTERISTICS FOR FCT2245T

Symbol Parameter Test Conditions

I

ODL

I

ODH

V

OH

V

OL

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 ±5µA at T

Output LOW Current VCC = 5V, V
Output HIGH Current VCC = 5V, V
Output HIGH Voltage VCC = Min.

IN

= V

IH

V

or V

Output LOW Voltage VCC = Min.

IN

= V

IH

V

A = –55°C.

or V

IN

= V

IH or VIL, VOUT

IN

= V

IH

IL

IL

or V

IL,VOUT

(1)

(3)

= 1.5V

(3)

= 1.5V

IOH = –12mA MIL.

OH

= –15mA COM'L.

I

Min. Typ.

16 48 — mA

–16 –48 — mA

2.4 3.3 — V

IOL = 12mA — 0.3 0.50 V

(2)

Max. Unit

2539 lnk 07

6.9 3

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

Symbol Parameter Test Conditions

∆ICC Quiescent Power Supply Current

TTL Inputs HIGH

ICCD Dynamic Power Supply

(4)

Current

VCC = Max.
V

IN = 3.4V

(3)

VCC = Max.
Outputs Open

OE

= T/R = GND

(1)

VIN = VCC
VIN = GND

Min. Typ.

— 0.5 2.0 mA

FCTxxxT — 0.15 0.25 mA/

FCT2xxxT — 0.06 0.12
One Input Toggling
50% Duty Cycle

IC Total Power Supply Current

(6)

VCC = Max. VIN = VCC FCTxxxT — 1.5 3.5 mA
Outputs Open

VIN = GND FCT2xxxT — 0.6 2.2
fi = 10MHz
50% Duty Cycle VIN = 3.4 FCTxxxT — 1.8 4.5

OE

= T/R = GND

VIN = GND FCT2xxxT 0.9 3.2
One Bit Toggling
VCC = Max. VIN = VCC FCTxxxT — 3.0 6.0

Outputs Open

VIN = GND FCT2xxxT — 1.2 3.4
fi = 2.5MHz
50% Duty Cycle VIN = 3.4 FCTxxxT — 5.0 14.0

OE

= T/R = GND

VIN = GND FCT2xxxT — 3.2 11.4
Eight Bits Toggling

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

3. Per TTL driven input (V

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

C = IQUIESCENT + IINPUTS + IDYNAMIC

6. I
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fiNi)

CC = Quiescent Current

I
∆I

CC = Power Supply Current for a TTL High Input (VIN = 3.4V)

H = Duty Cycle for TTL Inputs High

D

T = Number of TTL Inputs at DH

N
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f

CP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
i = Input Frequency

f

i = Number of Inputs at fi

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

CC = 5.0V, +25°C ambient.

IN = 3.4V). All other inputs at VCC or GND.

CC formula. These limits are guaranteed but not tested.

(2)

Max. Unit

MHz

(5)
(5)

(5)

(5)

2539 tbl 08

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

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

Symbol Parameter Conditions

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

t

PZH

t

PZL

t

PHZ

t

PLZ

Propagation Delay
A to B, B to A
Output Enable Time

OE

to A or B

Output Disable Time

OE

to A or B
Output Enable Time
T/R to A or B

(3)

Output Disable Time
T/R to A or B

(3)

CL = 50 pF

L

= 500

R

Symbol Parameter Conditions

tPLH
tPHL

tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ

Propagation Delay
A to B, B to A

Output Enable Time

OE

to A or B
Output Disable Time

OE

to A or B
Output Enable Time
T/R to A or B

(3)

Output Disable Time
T/R to A or B

(3)

CL = 50 pF

L = 500Ω

R

FCT245T

FCT2245T

Com'l. Mil. Com'l. Mil.

(1)

Min.

(2)

Max. Min

(2)

.

Max. Min

1.5 7.0 1.5 7.5 1.5 4.6 1.5 4.9 ns

Ω

1.5 9.5 1.5 10.0 1.5 6.2 1.5 6.5 ns

1.5 7.5 1.5 10.0 1.5 5.0 1.5 6.0 ns

1.5 9.5 1.5 10.0 1.5 6.2 1.5 6.5 ns

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.

(1)

Min.

(2)

Max. Min.

(2)

Max. Min.

1.5 4.1 1.5 4.5 1.5 3.8 — — ns

1.5 5.8 1.5 6.2 1.5 5.0 — — ns

1.5 4.8 1.5 5.2 1.5 4.3 — — ns

1.5 5.8 1.5 6.2 1.5 5.0 — — ns

1.5 4.8 1.5 5.2 1.5 4.3 — — ns

(2)

.

(2)

FCT245AT

FCT2245AT

Max. Min.

Max. Min.

(2)

Max. Unit

(2)

Max. Unit

2534 tbl 09

2534 tbl 10

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

FCT640T FCT640AT FCT640CT

Com'l. Mil. Com'l. Mil. Com'l. Mil.

(1)

Symbol Parameter Conditions

tPLH

Propagation Delay

tPHL

A to B, B to A

tPZH

Output Enable Time

tPZL

OE

to A or B

tPHZ

Output Disable Time

tPLZ

OE

to A or B

tPZH

Output Enable Time

tPZL

T/R to A or B

tPHZ

Output Disable Time

tPLZ

T/R to A or B

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.

(3)

(3)

CL = 50 pF

L = 500Ω

R

(2)

Min.

Max. Min.

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

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

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

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

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

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Unit

6.9 5

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

tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ

Propagation Delay
A to B, B to A
Output Enable Time

OE

to A or B
Output Disable Time

OE

to A or B
Output Enable Time
T/R to A or B

(3)

Output Disable Time
T/R to A or B

(3)

CL = 50 pF

L = 500Ω

R

Symbol Parameter Conditions

tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ

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.

Propagation Delay
A to B, B to A
Output Enable Time

OE

to A or B
Output Disable Time

OE

to A or B
Output Enable Time
T/R to A or B

(3)

Output Disable Time
T/R to A or B

(3)

CL = 50 pF

L = 500Ω

R

(1)

(1)

Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Unit

1.5 9.5 1.5 11.0 1.5 4.6 1.5 4.9 ns

1.5 11.0 1.5 12.0 1.5 6.2 1.5 6.5 ns

1.5 12.0 1.5 13.0 1.5 5.0 1.5 6.0 ns

1.5 11.0 1.5 12.0 1.5 6.2 1.5 6.5 ns

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.

Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Unit

1.5 4.1 1.5 4.5 1.5 3.8 — — ns

1.5 5.8 1.5 6.2 1.5 5.0 — — ns

1.5 4.8 1.5 5.2 1.5 4.3 — — ns

1.5 5.8 1.5 6.2 1.5 5.0 — — ns

1.5 4.8 1.5 5.2 1.5 4.3 — — ns

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

TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS

V

CC

V

OUT

50pF

C

L

Pulse

Generator

V

IN

D.U.T.

T

R

500

500

Ω

Ω

2534 drw 04

SWITCH POSITION

7.0V

DEFINITIONS:

L= Load capacitance: includes jig and probe capacitance.

C
R

T = Termination resistance: should be equal to ZOUT of the Pulse

Generator.

Test Switch

Open Drain
Disable Low

Enable Low

All Other Tests

SET-UP, HOLD AND RELEASE TIMES PULSE WIDTH

DATA

INPUT

TIMING

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

PRESET

CLEAR

CLOCK ENABLE

ETC.

t

t

REM

H

t

H

t

SU

t

SU

3V

1.5V
0V

3V

1.5V
0V

3V

1.5V

0V

3V

1.5V
0V

2534 drw 05

LOW-HIGH-LOW

PULSE

HIGH-LOW-HIGH

PULSE

Closed

Open

2534 lnk 14

1.5V

t

W

1.5V

2534 drw 06

SAME PHASE

INPUT TRANSITION

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

t

PLH

t

PLH

t

t

PHL

PHL

3V

1.5V
0V

OH

V

1.5V

V

OL

3V

1.5V
0V

2534 drw 07

ENABLE AND DISABLE TIMESPROPAGATION DELAY

ENABLE DISABLE

3V

CONTROL

INPUT

t

PHZ

PLZ

t

F ≤ 2.5ns; tR ≤ 2.5ns

t

PZL

OUTPUT

NORMALLY

OUTPUT

NORMALLY

HIGH

NOTES:

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

2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; t

LOW

SWITCH
CLOSED

t

PZH

SWITCH
OPEN

3.5V

1.5V

1.5V
0V

0.3V

0.3V

1.5V
0V

3.5V

V

OL

V

OH

0V

2534 drw 08

6.9 7

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

IDT

Temperature

Range

XX X

FCT

X

Family

X

Device

Type

PackageXProcess

Blank
B

P
D
SO
L
E
PY
Q

245T
640T
645T
245AT
640AT
645AT
245CT
640CT
645CT
245DT
645DT

Blank
2

54
74

Commercial
MIL-STD-883, Class B

Plastic DIP
CERDIP
Small Outline IC
Leadless Chip Carrier
CERPACK
Shrink Small Outline Package
Quarter-size Small Outline Package

Non-Inverting Octal Bidirectional Transceiver
Inverting Octal Bidirectional Transceiver
Non-Inverting Octal Bidirectional Transceiver

High Drive
Balanced Drive

–55°C to +125°C
0

°

C to +70°C

2539 drw 09

6.9 8