IDT74FCT2245CTQG8 [IDT]

Bus Transceiver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, GREEN, QSOP-20;


型号：	IDT74FCT2245CTQG8
厂家：	INTEGRATED DEVICE TECHNOLOGY
描述：	Bus Transceiver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, GREEN, QSOP-20 光电二极管逻辑集成电路
文件：	总7页 (文件大小：75K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

IDT74FCT2245AT/CT

FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER

INDUSTRIALTEMPERATURERANGE

FAST CMOS OCTAL

BIDIRECTIONAL

TRANSCEIVER

IDT74FCT2245AT/CT

FEATURES:

DESCRIPTION:

• A and C grades

• Low input and output leakage ≤1µA (max.)

• 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

TheIDToctalbidirectionaltransceiversarebuiltusinganadvanceddual

metal CMOS technology. The FCT2245T is designed for asynchronous

two-waycommunicationbetweendatabuses. Thetransmit/receive(T/R)

inputdetermines the directionofdata flowthroughthe bidirectionaltrans-

ceiver. Transmit (active high) enables data from A ports to B ports, and

receive (active low)fromBports toAports. The outputenable (OE)input,

whenhigh,disables bothAandBports byplacingtheminhighZcondition.

TheFCT2245Thasbalanceddriveoutputswithcurrentlimitingresistors.

This offers lowgroundbounce,minimalundershootandcontrolledoutput

falltimes-reducingtheneedforexternalseries terminatingresistors. The

FCT2245T parts are plug-in replacements for FCT245T parts.

FUNCTIONALBLOCKDIAGRAM

T/R

TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.

INDUSTRIAL TEMPERATURE RANGE

SEPTEMBER 2009

DSC-5511/7

IDT74FCT2245AT/CT

FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER

INDUSTRIALTEMPERATURERANGE

ABSOLUTEMAXIMUMRATINGS⁽¹⁾

PINCONFIGURATION

Symbol

Description

Max

Unit

(2)

VTERM

Terminal Voltage with Respect to GND

–0.5 to +7

(3)

VTERM

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

T/R

TSTG

IOUT

Storage Temperature

DC Output Current

–65 to +150

–60 to +120

° C

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.

CAPACITANCE (TA = +25°C, F = 1.0MHz)

Symbol

CIN

Parameter⁽¹⁾

Input Capacitance

Output Capacitance

Conditions

VIN = 0V

Typ.

Max. Unit

COUT

VOUT = 0V

GND

NOTE:

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

SOIC/ QSOP

TOP VIEW

PINDESCRIPTION

Pin Names

Description

Output Enable Input (Active LOW)

Transmit/Receive Input

T/R

A0 - A7

B0 - B7

Side A Inputs or 3-State Outputs

Side BInputs or 3-State Outputs

FUNCTIONTABLE⁽¹⁾

Inputs

T/R

Outputs

Bus B Data to Bus A

Bus A Data to Bus B

HighZState

NOTE:

1. H = HIGH Voltage Level

X = Don’t Care

L = LOW Voltage Level

IDT74FCT2245AT/CT

FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER

INDUSTRIALTEMPERATURERANGE

DCELECTRICALCHARACTERISTICSOVEROPERATINGRANGE

FollowingConditionsApplyUnlessOtherwiseSpecified:

Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%

Symbol

VIH

VIL

Parameter

Input HIGH Level

Test Conditions⁽¹⁾

Guaranteed Logic HIGH Level

Min.

Typ.⁽²⁾

—

Max.

—

0.8

Unit

Input LOW Level

Guaranteed Logic LOW Level

VCC = Max.

—

IIH

Input HIGH Current⁽⁴⁾

Input LOW Current⁽⁴⁾

VI = 2.7V

VI = 0.5V

VI = 2.7V

VI = 0.5V

—

µA

IIL

VCC = Max.

—

IOZH

IOZL

High Impedance Output Current

(3-State Output Pins)⁽⁴⁾

Input HIGH Current⁽⁴⁾

Clamp Diode Voltage

Input Hysteresis

VCC = Max.

—

VCC = Max., VI = VCC (Max.)

VCC = Min., IIN = –18mA

—

µA

VIK

–0.7

200

0.01

–1.2

—

ICC

Quiescent Power Supply Current

VCC = Max.

VIN = GND or VCC

OUTPUTDRIVECHARACTERISTICS

Symbol

Parameter

OutputLOWCurrent

Output HIGH Current

OutputHIGHVoltage

Test Conditions⁽¹⁾

Min.

Typ.⁽²⁾

Max.

—

Unit

(3)

IODL

IODH

VOH

VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V

(3)

VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V

-16

2.4

-48

—

VCC = Min

IOH = –15mA

3.3

—

VIN = VIH or VIL

VCC = Min

VOL

Output LOWVoltage

IOL = 12mA

—

0.3

0.5

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.

IDT74FCT2245AT/CT

FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER

INDUSTRIALTEMPERATURERANGE

POWERSUPPLYCHARACTERISTICS

Symbol

Parameter

Test Conditions⁽¹⁾

Min.

Typ.⁽²⁾

Max.

Unit

ΔICC

Quiescent Power Supply Current

TTL Inputs HIGH

VCC = Max.

VIN = 3.4V

—

0.5

(3)

ICCD

Dynamic Power Supply

Current⁽⁴⁾

VCC = Max.

Outputs Open

OE = T/R = GND

One Input Toggling

50% Duty Cycle

VIN = VCC

VIN = GND

—

0.06

0.12

mA/

MHz

Total Power Supply Current⁽⁶⁾

VCC = Max.

Outputs Open

fi = 10MHz

VIN = VCC

VIN = GND

—

0.6

0.9

1.2

3.2

2.2

3.2

50% Duty Cycle

OE = T/R = GND

One BitToggling

VIN = 3.4V

VIN = GND

(5)

3.4

VCC = Max.

Outputs Open

fi = 2.5MHz

VIN = VCC

VIN = GND

(5)

11.4

50% Duty Cycle

OE = T/R = GND

Eight Bits Toggling

VIN = 3.4V

VIN = GND

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.

IDT74FCT2245AT/CT

FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER

INDUSTRIALTEMPERATURERANGE

SWITCHINGCHARACTERISTICSOVEROPERATINGRANGE⁽¹⁾

74FCT2245AT

74FCT2245CT

(2)

Symbol

tPLH

Parameter

Condition⁽¹⁾

CL = 50 pF

RL = 500Ω

Min.

Max.

Min.

Max.

Unit

PropagationDelay

A to B, B to A

1.5

4.6

1.5

4.1

tPHL

tPZH

tPZL

OutputEnableTime

OE to A or B

1.5

6.2

1.5

5.8

4.8

5.8

4.8

tPHZ

tPLZ

OutputDisableTime

OE to A or B

tPZH

tPZL

OutputEnableTime

6.2

(3)

T/R to A or B

tPHZ

tPLZ

OutputDisableTime

(3)

T/R to A or B

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.

IDT74FCT2245AT/CT

FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER

INDUSTRIALTEMPERATURERANGE

TESTCIRCUITSANDWAVEFORMS

SWITCHPOSITION

7.0V

Test

Switch

Closed

Open

500W

Open Drain

Disable Low

Enable Low

OUT

Pulse

Generator

D.U.T

All Other Tests

50pF

500W

DEFINITIONS:

CL = Load capacitance: includes jig and probe capacitance.

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

Octal Link

Test Circuits for All Outputs

DATA

1.5V

INPUT

LOW-HIGH-LOW

tSU

1.5V

PULSE

1.5V

TIMING

INPUT

ASYNCHRONOUS CONTROL

tREM

PRESET

CLEAR

ETC.

1.5V

HIGH-LOW-HIGH

PULSE

1.5V

SYNCHRONOUS CONTROL

PRESET

1.5V

CLEAR

tSU

CLOCK ENABLE

ETC.

Pulse Width

Octal Link

Set-Up, Hold, and Release Times

ENABLE

DISABLE

1.5V

SAME PHASE

CONTROL

INPUT

1.5V

INPUT TRANSITION

PLH

PHL

PZL

tPLZ

VOH

OUTPUT

3.5V

1.5V

3.5V

1.5V

OUTPUT

NORMALLY

LOW

SWITCH

CLOSED

VOL

tPLH

0.3V

VOL

1.5V

tPZH

tPHZ

OPPOSITE PHASE

INPUT TRANSITION

VOH

OUTPUT

NORMALLY

HIGH

SWITCH

OPEN

1.5V

Octal Link

Propagation Delay

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.

IDT74FCT2245AT/CT

FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER

INDUSTRIALTEMPERATURERANGE

ORDERINGINFORMATION

XXXX

FCT

Package

Device Type

Temp. Range

SOG

Small Outline IC - Green

Quarter-size Small Outline Package - Green

Octal Bidirectional Transceiver

2245AT

2245CT

40 C to +85 C

DatasheetDocumentHistory

09/29/09 Pg. 7

Updatedthe orderinginformationbyremovingthe "IDT"notationandnonRoHSpart.

CORPORATE HEADQUARTERS

6024 Silver Creek Valley Road

San Jose, CA 95138

for SALES:

for Tech Support:

logichelp@idt.com

800-345-7015 or 408-284-8200

fax: 408-284-2775

www.idt.com

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