IDTQS3R245 [IDT]

HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH; 高速CMOS快速切换8位低电阻总线开关


型号：	IDTQS3R245
厂家：	INTEGRATED DEVICE TECHNOLOGY
描述：	HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH 高速CMOS快速切换8位低电阻总线开关开关
文件：	总5页 (文件大小：44K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

IDTQS3R245

HIGH-SPEEDCMOSQUICKSWITCH8-BITLOWRESISTANCEBUSSWITCH

INDUSTRIALTEMPERATURERANGE

QUICKSWITCH^®PRODUCTS

HIGH-SPEED CMOS

IDTQS3R245

QUICKSWITCH 8-BIT LOW

RESISTANCE BUS SWITCH

DESCRIPTION:

FEATURES:

TheQS3R245providesasetofeighthigh-speedCMOSTTL-compatible

bus switches in a pinout compatible with 74FCT245, 74F245, 74ALS/AS/

LS245 8-bit transceivers. The low ON resistance of the QS3R245 allows

inputs to be connected to outputs without adding propagation delay and

withoutgeneratingadditionalgroundbouncenoise.TheOutputEnable(OE)

signal turns the switches on similar to the OEsignal of the 74’245. The low

ONresistanceofQS3R245makesitidealforPCIhotdockingapplications.

QuickSwitch devices provide an order of magnitude faster speed than

conventionallogicdevices.

• Enhanced N channel FET with no inherent diode to Vcc

• 5Ω bidirectional switches connect inputs to outputs

• Pin compatible with the 74F245, 74FCT245, and 74FCT245T

• Zero propagation delay, zero ground bounce

• Undershoot clamp diodes on all switch and control inputs

• TTL-compatible control inputs

• Available in SOIC and QSOP packages

The QS3R245 is characterized for operation at -40°C to +85°C.

APPLICATIONS:

• Hot-swapping and hot-docking (low resistance for PCI and

Compact PCI applications)

• Bus switching and isolation

• Voltage translation (5V to 3.3V)

• Capacitance reduction and isolation

• Power conservation

• Logic replacement (data processing)

• Clock gating

FUNCTIONALBLOCKDIAGRAM

TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.

INDUSTRIAL TEMPERATURE RANGE

NOVEMBER 1999

1999 Integrated Device Technology, Inc.

DSC-5546/1

IDTQS3R245

HIGH-SPEEDCMOSQUICKSWITCH8-BITLOWRESISTANCEBUSSWITCH

INDUSTRIALTEMPERATURERANGE

ABSOLUTEMAXIMUMRATINGS⁽¹⁾

PINCONFIGURATION

Symbol

Description

Supply Voltage to Ground

DC Switch Voltage Vs

Max

–0.5 to +7

–3

Unit

(2)

VTERM

(3)

VTERM

VCC

(3)

VTERM

DC Input Voltage VIN

VAC

AC Input Voltage (pulse width ≤ 20ns)

DC Output Current

IOUT

PMAX

TSTG

120

Maximum Power Dissipation

Storage Temperature

0.5

–65 to +150

°C

NOTE:

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.

2. Vcc terminals.

3. All terminals except Vcc.

GND

CAPACITANCE

(TA = +25°C, f = 1.0MHZ, VIN = 0V, VOUT = 0V)

SOIC/ QSOP/ TSSOP

TOP VIEW

Pins

Typ.

Max.⁽¹⁾

Unit

Control Pins

Quickswitch Channels (Switch OFF)

NOTE:

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

PINDESCRIPTION

Pin Names

Description

OutputEnable

Data I/Os

FUNCTIONTABLE⁽¹⁾

Outputs

Disconnected

Ax = Bx

NOTE:

1. H = HIGH Voltage Level

L = LOW Voltage Level

IDTQS3R245

HIGH-SPEEDCMOSQUICKSWITCH8-BITLOWRESISTANCEBUSSWITCH

INDUSTRIALTEMPERATURERANGE

DCELECTRICALCHARACTERISTICSOVEROPERATINGRANGE

FollowingConditionsApplyUnlessOtherwiseSpecified:

Industrial: TA = –40°C to +85°C, VCC = 5.0V ±10%

Symbol

VIH

Parameter

Input HIGH Level

Test Conditions

Guaranteed Logic HIGH for Control Pins

Guaranteed Logic LOW for Control Pins

0V ≤ VIN ≤ VCC

Min.

Typ.⁽¹⁾

—

Max.

—

Unit

VIL

Input LOW Level

—

0.8

±1

IIN

Input LeakageCurrent (Control Inputs)

Off-State Output Current (Hi-Z)

Switch ON Resistance⁽²⁾

—

µA

Ω

IOZ

0V ≤ VOUT ≤ VCC, Switches OFF

—

0.001

2.5

RON

VCC = Min., VIN = 0V, ION = 30mA

VCC = Min., VIN = 2.4V, ION =15mA

VIN = VCC = 5V, IOUT = -5µA

—

8.5

4.3

PassVoltage⁽³⁾

3.7

NOTES:

1. Typical values are at VCC = 5.0V, TA = 25°C.

2. Max value of R^ONis guaranteed but not tested.

3. Pass Voltage is guaranteed but not production tested.

TYPICAL ON RESISTANCE vs VIN AT VCC = 5V

RON

(ohms)

1.5

2.0

2.5

3.0

3.5

1.0

0.0

0.5

VIN

(Volts)

IDTQS3R245

HIGH-SPEEDCMOSQUICKSWITCH8-BITLOWRESISTANCEBUSSWITCH

INDUSTRIALTEMPERATURERANGE

POWERSUPPLYCHARACTERISTICS

Symbol

ICCQ

Parameter

TestConditions⁽¹⁾

VCC = Max., VIN = GND or Vcc, f = 0

VCC = Max., VIN = 3.4V, f = 0

Max.

Unit

µA

Quiescent Power Supply Current

Power Supply Current per Control Input HIGH ⁽²⁾

Dynamic Power Supply Current per MHz⁽³⁾

∆ICC

2.5

ICCD

VCC = Max., A and B pins open

0.25

mA/MHz

Control Inputs Toggling at 50% Duty Cycle

NOTES:

1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.

2. Per TLL driven input (V^IN= 3.4V, control inputs only). A and B pins do not contribute to ∆Icc.

3. This current applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The A and B inputs generate no significant

AC or DC currents as they transition. This parameter is guaranteed but not production tested.

SWITCHINGCHARACTERISTICSOVEROPERATINGRANGE

TA = -40°C to +85°C, VCC = 5.0V ± 10%;

C^LOAD= 50pF, RLOAD = 500Ω unless otherwise noted.

Symbol

tPLH

Parameter

Min.⁽¹⁾

Typ.

Max.

Unit

DataPropagationDelay^(2,3)

An to/from Bn

—

0.12

tPHL

tPZL

SwitchTurn-onDelay

OE to Ax/Bx

SwitchTurn-offDelay⁽²⁾

0.5

—

5.6

4.5

tPZH

tPLZ

tPHZ

OE to Ax/Bx

NOTES:

1. Minimums are guaranteed but not production tested.

2. This parameter is guaranteed but not production tested.

3. The bus switch contributes no propagation delay other than the RC delay of the ON resistance of the switch and the load capacitance. The time constant for the switch alone

is of the order of 0.12ns for C^L= 50pF. Since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very little propagation delay to

the system. Propagation delay of the bus switch, when used in a system, is determined by the driving circuit on the driving side of the switch and its interaction with the load

on the driven side.

IDTQS3R245

HIGH-SPEEDCMOSQUICKSWITCH8-BITLOWRESISTANCEBUSSWITCH

INDUSTRIALTEMPERATURERANGE

ORDERINGINFORMATION

IDTQS

XXXXX

Package

Process

Device Type

Industrial (-40°C to +85°C)

Blank

Small Outline IC

Quarter Size Outline Package

High Speed Quickswitch 8-Bit Low Resistance Bus Switch

3R245

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for Tech Support:

logichelp@idt.com

(408) 654-6459

www.idt.com

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