Integrated Device Technology Inc IDT74FCT645TDB, IDT74FCT645TD, IDT74FCT645CTQB, IDT74FCT645CTQ, IDT74FCT645CTPYB Datasheet

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 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.

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 ≤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

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

A1
A2

A3

1
2
3
4

20
19
18
17
16
15
14
13

Vcc

12
11

T/R

B

1

A4
A5
A6
A7

OE

B2
B3
B4
B5
B6

GND B7

A0

B0

P20-1
D20-1

SO20-2

SO20-7*

SO20-8**

&

E20-1

INDEX

B0
B1
B2
B3
B4

A2
A3
A4
A5
A6

B7B6B

GND

A

7

A0A

1

Vcc

T/R

OE

15
14

5

18
17
16

5
6
7
8

4

L20-2

9

10 11 12 13

32

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

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

VTERM

(2)

Terminal Voltage
with Respect to
GND

–0.5 to +7.0 –0.5 to +7.0 V

VTERM

(3)

Terminal Voltage
with Respect to
GND

–0.5 to

V

CC +0.5

–0.5 to

VCC +0.5

V

TA Operating

Temperature

0 to +70 –55 to +125 °C

TBIAS Temperature

Under Bias

–55 to +125 –65 to +135 °C

TSTG Storage

Temperature

–55 to +125 –65 to +150 °C

PT Power Dissipation 0.5 0.5 W
IOUT DC Output

Current

–60 to +120 –60 to +120 mA

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

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

CIN Input

Capacitance

VIN = 0V 6 10 pF

COUT Output

Capacitance

VOUT = 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

A0-A

7

Side A Inputs or 3-State Outputs

B0-B

7

Side B Inputs or 3-State Outputs

Inputs

OE

OE

T/

R

R

Outputs

L L Bus B Data to Bus A

(1)

L H Bus B Data to Bus B

(1)

H X High Z State

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: 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

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

(4)

VCC = Max. VI = 2.7V — — ±1 µA

II L Input LOW Current

(4)

VI = 0.5V — — ±1
IOZH High Impedance Output Current VCC = Max. VO = 2.7V — — ±1 µA
IOZL (3-State Output pins)

(4)

VO = 0.5V — — ±1

II Input HIGH Current

(4)

VCC = Max., VI = VCC (Max.) — — ±1 µA
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

OUTPUT DRIVE CHARACTERISTICS FOR FCT245T/640T/645T

Symbol Parameter Test Conditions

(1)

Min. Typ.

(2)

Max. Unit

VOH Output HIGH Voltage VCC = Min.

V

IN = VIH or VIL

IOH = –6mA MIL.
I

OH = –8mA COM'L.

2.4 3.3 — V

IOH = –12mA MIL.
I

OH = –15mA COM'L.

2.0 3.0 — V

VOL Output LOW Voltage VCC = Min.

V

IN = VIH or VIL

IOL = 48mA MIL.
I

OL = 64mA COM'L.

— 0.3 0.55 V

IOS Short Circuit Current VCC = Max., VO = 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 VCC = 5V, V

IN

= V

IH or VIL, VOUT

= 1.5V

(3)

16 48 — mA

I

ODH

Output HIGH Current VCC = 5V, V

IN

= V

IH

or V

IL,VOUT

= 1.5V

(3)

–16 –48 — mA

V

OH

Output HIGH Voltage VCC = Min.

V

IN

= V

IH

or V

IL

IOH = –12mA MIL.
I

OH

= –15mA COM'L.

2.4 3.3 — V

V

OL

Output LOW Voltage VCC = Min.

V

IN

= V

IH

or V

IL

IOL = 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 ±5µA at T

A = –55°C.