Datasheet IDT71V256SA Datasheet (Integrated Device Technology)

IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER

INDUSTRIAL TEMPERATURE RANGE

FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVER

FEA TURES:

• A and C grades

• Low input and output leakage

• CMOS power levels

• True TTL input and output compatibility:

–VOH = 3.3V (typ.)
–VOL = 0.3V (typ.)

• Meets or exceeds JEDEC standard 18 specifications

• Resistor outputs -15mA IOH, 12mA IOL

• Reduced system switching noise

• Available in SOIC and QSOP packages

FUNCTIONAL BLOCK DIAGRAM

≤≤

≤1µA (max.)

≤≤

IDT74FCT2245AT/CT

DESCRIPTION:

The IDT octal bidirectional transceivers are built using an advanced dual
metal CMOS technology. The FCT2245T is 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 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
FCT2245T parts are plug-in replacements for FCT245T parts.

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

5

B

6

A

6

B

7

A

7

B

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

JUNE 2006INDUSTRIAL TEMPERATURE RANGE

1

© 2006 Integrated Device Technology, Inc. DSC-5511/6

IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER

INDUSTRIAL TEMPERATURE RANGE

PIN CONFIGURATION

T/R

A0

A1

A2

A3

A4

A5

A6

A7

GND

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

VCC

OE

B0

B1

2

B

B3

B4

B5

B6

B7

ABSOLUTE MAXIMUM RATINGS

Symbol Description Max Unit

(2)

VTERM
VTERM
TSTG Storage Temperature –65 to +150 °C
I

OUT DC Output Current –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

Vcc by +0.5V unless otherwise noted.

2. Inputs and Vcc terminals only.

3. Output and I/O terminals only.

Terminal Voltage with Respect to GND –0.5 to +7 V

(3)

Terminal Voltage with Respect to GND –0.5 to VCC+0.5 V

(1)

CAPACITANCE (TA = +25°C, F = 1.0MHz )

Symbol Parameter

CIN Input Capacitance VIN = 0V 6 10 pF
C

OUT Output Capacitance VOUT = 0V 8 12 pF

NOTE:

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

(1)

Conditions Typ. Max. Unit

SOIC/ QSOP

TOP VIEW

PIN DESCRIPTION

Pin Names Description

OE Output Enable Input (Active LOW)

T/R Transmit/Receive Input
A0 - A7 Side A Inputs or 3-State Outputs
B

0 - B7 Side BInputs or 3-State Outputs

FUNCTION TABLE

Inputs

OE T/R Outputs

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

H X High Z State

NOTE:

1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level

(1)

2

IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER

INDUSTRIAL TEMPERATURE RANGE

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%

Symbol Parameter Test Conditions

(1)

Min. Typ.

VIH Input HIGH Level Guaranteed Logic HIGH Level 2 — — V
VIL Input LOW Level Guaranteed Logic LOW Level — — 0. 8 V

IIH Input HIGH Current
IIL Input LOW Current

OZH High Impedance Output Current VCC = Max. VI = 2.7V — — ±1µA

I
IOZL (3-State Output Pins)

II Input HIGH Current

(4)

(4)

(4)

(4)

VCC = Max. VI = 2.7V — — ±1µA
VCC = Max. VI = 0.5V — — ±1µA

VI = 0.5V — — ±1

VCC = Max., VI = VCC (Max.) — — ±1µA

VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V

VH Input Hysteresis — — 200 — mV

CC Quiescent Power Supply Current VCC = Max. — 0.01 1 mA

I

V

IN = GND or VCC

(2)

Max. Unit

OUTPUT DRIVE CHARACTERISTICS

Symbol Parameter Test Conditions

IODL Output LOW Current VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V
IODH Output HIGH Current VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V

(1)

(3)
(3)

Min. Typ.

16 48 — mA

-16 -48 — mA

VOH Output HIGH Voltage VCC = Min IOH = –15mA 2.4 3.3 — V

VIN = VIH or VIL

VOL Output LOW Voltage VCC = Min IOL = 12mA — 0.3 0.5 V

VIN = VIH or VIL

NOTES:

1. For conditions shown as Min. or Max., 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 tested at one time. Duration of the test should not exceed one second.

4. The test limit for this parameter is ±5μA at TA = -55°C.

(2)

Max. Unit

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IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER

INDUSTRIAL TEMPERATURE RANGE

POWER SUPPLY CHARACTERISTICS

Symbol Parameter Test Conditions

CC Quiescent Power Supply Current VCC = Max. — 0.5 2 mA

ΔI

TTL Inputs HIGH VIN = 3.4V

(3)

(1)

Min. Typ.

ICCD Dynamic Power Supply VCC = Max. VIN = VCC — 0.06 0.12 mA/

(4)

Current

Outputs Open VIN = GND MHz
OE = T/R = GND

One Input Toggling
50% Duty Cycle

I

C Total Power Supply Current

(6)

VCC = Max. VIN = VCC — 0.6 2.2 mA
Outputs Open VIN = GND
fi = 10MHz

50% Duty Cycle V
OE = T/R = GND V

IN = 3.4V — 0.9 3.2
IN = GND

One BitToggling
V

CC = Max. VIN = VCC — 1.2 3.4

Outputs Open VIN = GND
fi = 2.5MHz

50% Duty Cycle V

IN = 3.4V — 3.2 11.4

OE = T/R = GND VIN = GND
Eight Bits Toggling

NOTES:

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

2. Typical values are at VCC = 5.0V, +25°C ambient.

3. Per TTL driven input; (VIN = 3.4V). All other inputs at VCC 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 ΔICC formula. These limits are guaranteed but not tested.

6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ΔICC DHNT + ICCD (fCP/2+ fiNi)
ICC = Quiescent Current
ΔICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fi = Output Frequency
Ni = Number of Outputs at fi

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

(2)

Max. Unit

(5)

(5)

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IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER

INDUSTRIAL TEMPERATURE RANGE

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

(1)

74FCT2245AT 74FCT2245CT

Symbol Parameter Condition

t

PLH Propagation Delay CL = 50 pF 1.5 4.6 1.5 4.1 ns

(1)

Min.

(2)

Max. Min.

(2)

Max. Unit

tPHL A to B, B to A RL = 500Ω
tPZH Output Enable Time 1.5 6.2 1.5 5.8 ns
tPZL OE to A or B

PHZ Output Disable Time 1.5 5 1.5 4.8 ns

t
tPLZ OE to A or B
tPZH Output Enable Time 1.5 6.2 1.5 5.8 ns
tPZL T/R to A or B

(3)

tPHZ Output Disable Time 1.5 5 1.5 4.8 ns

PLZ T/R to A or B

t

NOTES:

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)

5

IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER

TEST CIRCUITS AND WAVEFORMS

CC

V

500W

VOUT

50pF

L

C

500W

Octal Link

Pulse

Generator

IN

V

D.U.T
.

T

R

Test Circuits for All Outputs

7.0V

INDUSTRIAL TEMPERATURE RANGE

SWITCH POSITION

Test Switch

Open Drain

Disable Low Closed

Enable Low

All Other Tests Open

DEFINITIONS:

L = Load capacitance: includes jig and probe capacitance.

C
R

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

DATA

INPUT

TIMING

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

PRESET

CLEAR

CLOCK ENABLE

ETC.

Set-Up, Hold, and Release Times

SAME PHASE

INPUT TRANSITION

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

Propagation Delay

tSU

tREM

tSU

tPLH

tH

tPHL

tPLH tPHL

3V

1.5V

tH

0V
3V

1.5V
0V

3V

1.5V
0V

3V

1.5V

LOW-HIGH-LOW

PULSE

HIGH-LOW-HIGH

PULSE

1.5V

tW

1.5V

0V

Pulse Width

Octal Link

3V

1.5V
0V

V

1.5V
VOL

3V

1.5V
0V

Octal Link

OH

CONTROL

INPUT

OUTPUT

NORMALLY

LOW

OUTPUT

NORMALLY

HIGH

ENABLE DISABLE

PLZtPZL

t

SWITCH
CLOSED

3.5V

1.5V

tPZH tPHZ

SWITCH
OPEN

1.5V

0V

Octal Link

0.3V

0.3V

Octal Link

3V

1.5V

0V

3.5V

VOL

VOH

0V

Enable and Disable Times

NOTES:

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

2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.

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IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER

ORDERING INFORMATION

INDUSTRIAL TEMPERATURE RANGE

IDT XX

Temp. Range

FCT

XXXX

Device Type

XX

Package

SO
SOG
Q
QG

2245AT
2245CT

74

Small Outline IC
SOIC - Green
Quarter-size Small Outline Package
QSOP - Green

Octal Bidirectional Transceiver

– 40°C to +85°C

CORPORATE HEADQUARTERS for SALES: for Tech Support:

6024 Silver Creek Valley Road 800-345-7015 or 408-284-8200 [email protected]
San Jose, CA 95138 fax: [phone]

www.idt.com

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