IDT74FST3244Q [IDT]

Bus Driver, CBT/FST/QS/5C/B Series, 4-Func, 4-Bit, True Output, CMOS, PDSO20, QSOP-20;


型号：	IDT74FST3244Q
厂家：	INTEGRATED DEVICE TECHNOLOGY
描述：	Bus Driver, CBT/FST/QS/5C/B Series, 4-Func, 4-Bit, True Output, CMOS, PDSO20, QSOP-20 驱动光电二极管逻辑集成电路
文件：	总5页 (文件大小：78K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

IDT74FST3244

OCTALBUSSWITCH

INDUSTRIALTEMPERATURERANGE

OCTAL BUS SWITCH

IDT74FST3244

FEATURES:

DESCRIPTION:

−

Bus switches provide zero delay paths

Low switch on-resistance

TTL-compatible input and output levels

ESD > 2000V per MIL-STD-883, Method 3015; > 200V using

machine model (C = 200pF, R = 0)

Hot insertion capability

The FST3244 belongs to IDT's family of Bus switches. Bus switch

devices perform the function of connecting or isolating two ports without

providing any inherent current sink or source capability. Thus they

generatelittleornonoiseoftheirownwhileprovidingalowresistancepath

foranexternaldriver. Thesedevicesconnectinputandoutputportsthrough

an n-channel FET. When the gate-to-source junction of this FET is

adequatelyforward-biasedthedeviceconductsortheresistancebetween

inputandoutputportsissmall. Withoutadequatebiasonthegate-to-source

junctionoftheFET,theFETisturnedoff,thereforewithnoVCCapplied,the

device has hotinsertioncapability.

−

Very low power dissipation

Available in QSOP, SOIC, SSOP, and TSSOP Packages

The lowon-resistance andsimplicityofthe connectionbetweeninput

andoutput ports reduces the delay inthis pathtoclose tozero.

The FST3244 is an octal TTL-compatible bus switch. The OE pins

provide outputenable controlforall8bits. This device is pin-compatible

withandfunctionallysimilartothe FCT244T.

PINCONFIGURATION

FUNCTIONALBLOCKDIAGRAM

1OE

1A0

2B3

Vcc

2OE

1B0

2A3

1B1

1A1

2B2

1A2

2B1

1A3

2B0

SO20-2

SO20-8

SO20-9

SO20-7

2A2

1B2

2A1

1B3

2A0

2B1

GND

2A2

QSOP/ SOIC/ SSOP/ TSSOP

TOP VIEW

INDUSTRIAL TEMPERATURE RANGE

APRIL 2001

2001 Integrated Device Technology, Inc.

DSC-5522/-

IDT74FST3244

OCTALBUSSWITCH

INDUSTRIALTEMPERATURERANGE

ABSOLUTE MAXIMUM RATINGS⁽¹⁾

PIN DESCRIPTION

Symbol

Rating

Max.

–0.5 to +7

–65 to +150

128

Unit

Pin Names

Description

(2)

VTERM

Terminal Voltage with Respect to GND

Storage Temperature

xOE

Output Enable Inputs (Active LOW)

TSTG

IOUT

°C

xAx

xBx

A Port Bits

B Port Bits

Maximum Continuous Channel Current

FST LINK

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.

FUNCTION TABLE ⁽¹⁾

1OE

2OE

Description

Disconnect

Connect 1A to 1B

2. Vcc, Control, and Switch terminals.

Connect 2A to 2B

Connect 1A to 1B and 2A to 2B

CAPACITANCE ⁽¹⁾

NOTE:

1. H = HIGH

L = LOW

Symbol

Parameter

Conditions⁽²⁾

Typ. Unit

CIN

Control Input Capacitance

CI/O

Switch Input/Output

Capacitance

Switch Off

NOTES:

1. Capacitance is characterized but not tested.

2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Operating Conditions: TA = -40°C to +85°C, VCC = 5.0V ±5%

Symbol

Parameter

Test Conditions

Min.

Typ.⁽¹⁾

Max.

Unit

VIH

Control Input HIGH Voltage

Guaranteed Logic HIGH Level

—

VIL

IIH

Control Input LOW Voltage

Control Input HIGH Current

Control Input LOW Current

Current during

Guaranteed Logic LOW Level

—

0.8

±1

–1.2

±1

VCC = Max.

VI = VCC

µA

IIL

VI = GND

—

IOZH

IOZL

VIK

IOFF

ICC

VCC = Max., VO = 0 to 5V

—

µA

Bus Switch DISCONNECT

Clamp Diode Voltage

—

VCC = Min., IIN = –18mA

–0.7

—

Switch Power Off Leakage

Quiescent Power Supply Current

VCC = 0V, VIN or VO ≤ 5.5V

µA

VCC = Max., VIN = GND or VCC

0.1

BUS SWITCH IMPEDANCE OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Operating Conditions: TA = -40°C to +85°C, VCC = 5.0V ±5%

Symbol

Parameter

Test Conditions

Min.

Typ.⁽¹⁾Max.

Unit

(2)

RON

Switch CONNECT Resistance, A to B

Vcc = Min., VIN = 0V

ION = 30mA

—

Ω

Vcc = Min., VIN = 2.4V

ION = 15mA

—

(3)

IOS

Short Circuit Current, A to B

A(B) = 0V, B(A) = VCC

100

NOTES:

1. Typical values are at Vcc = 5.0V, +25°C ambient.

2. The voltage drop between the indicated ports divided by the current through the switch.

3. Not more than one output should be shorted at one time. Duration of the test should not esceed one second.

IDT74FST3244

OCTALBUSSWITCH

INDUSTRIALTEMPERATURERANGE

POWER SUPPLY CHARACTERISTICS

Symbol

Parameter

Quiescent Power Supply Current

TTL Inputs HIGH

Test Conditions⁽¹⁾

Min.

Typ.⁽²⁾Max.

Unit

∆ICC

VCC = Max.

—

0.5

1.5

(3)

VIN = 3.4V

ICCD

Dynamic Power Supply Current⁽⁴⁾

VCC = Max.

Outputs Open

1 Enable Pin Toggling

50% Duty Cycle

VCC = Max.

Outputs Open

2 Enable Pins Toggling

fi = 10MHz

VIN = VCC

—

120

160

µA/

MHz/

Enable

VIN = GND

(6)

Total Power Supply Current

VIN = VCC

—

2.4

2.9

3.2

4.7

VIN = GND

VIN = 3.4

50% Duty Cycle

VIN = GND

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. 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. CPD = ICCD/VCC

CPD = Power Dissipation Capacitance

6. IC = IQUIESCENT + IINPUTS + IDYNAMIC

IC = ICC + ∆ICC DHNT + ICCD (fiN)

ICC = Quiescent Current

∆ICC = 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)

fi = Input Frequency

N = Number of Switches Toggling at fi

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

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Operating Conditions: TA = -40°C to +85°C, VCC = 5.0V ±5%

Typ.

Symbol

tPLH

Description

Min.⁽²⁾

Max.

Unit

Data Propagation Delay

—

0.25

(2)

tPHL

A to B, B to A

tPZH

tPZL

Switch CONNECT Delay

xOE to A or B

1.5

—

6.5

5.5

—

tPHZ

Switch DISCONNECT Delay

xOE to A or B

tPLZ

|QCI|

Charge Injection During Switch DISCONNECT,

1.5

(3)

xOE to A or B

NOTES:

1. See test circuit and waveforms.

2. The bus switch contributes no propagation delay other than the RC delay of the load interacting with the RC of the switch.

3. IQCII is the charge injection for a single switch DISCONNECT and applies to either single switches or multiplexers.

IQDCII is the charge injection for a multiplexer as the multiplexed port switches from one path to another. Charge Injection is reduced becasue the injection

from the DISCONNECT of the first path is compensated by the CONNECT of the second path.

IDT74FST3244

OCTALBUSSWITCH

INDUSTRIALTEMPERATURERANGE

TESTCIRCUITSANDWAVEFORMS

PROPAGATIONDELAY

TEST CIRCUITS FOR ALL OUTPUTS

V CC

7.0V

SAME PHASE

INPUT TRANSITION

1.5V

500Ω

tPLH

tPHL

VOH

1.5V

VOL

V_OUT

VIN

OUTPUT

Pulse

Generator

D.U.T.

50pF

500Ω

OPPOSITE PHASE

INPUT TRANSITION

1.5V

SET-UP, HOLD, AND RELEASE TIMES

SWITCH POSITION

Test

Switch

1.5V

DATA

INPUT

Open Drain

Disable Low

Enable Low

All Other Tests

tSU

Closed

Open

1.5V

TIMING

INPUT

tREM

1.5V

ASYNCHRONOUS

CONTROL

FCT LINK

DEFINITIONS:

C^L= Load capacitance: includes jig and probe capacitance.

R^T= Termination resistance: should be equal to Z^OUTof the Pulse

Generator.

1.5V

SYNCHRONOUS

CONTROL

tSU

CHARGEINJECTION

V^CC

ENABLEANDDISABLETIMES

ENABLE

DISABLE

Switch

Out

Enable/Select⁽¹⁾

1 MHz

(3)

V^OUT

CONTROL

INPUT

1.5V

D.U.T.

Signal

Generator

Switch In

Switch In (MUX)⁽²⁾

tPZL

tPLZ

CL =

3.5V

1.5V

3.5V

VOL

OUTPUT

NORMALLY

LOW

50pF

SWITCH

CLOSED

0.3V

tPZH

tPHZ

VOH

OUTPUT

NORMALLY

HIGH

SWITCH

OPEN

NOTES:

1.5V

1. Select is used with multiplexers for measuring IQDCII during multiplexer

select. During all other tests Enable is used.

2. Used with multiplexers to measure IQDCII only.

3.ChargeInjection=∆VOUT CL,withEnabletogglingforIQCIIorSelecttoggling

for IQDCII. ∆VOUT is the change in VOUT and is measured with a 10MΩ

probe.

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

PULSEWIDTH

LOW-HIGH-LOW

1.5V

PULSE

HIGH-LOW-HIGH

PULSE

1.5V

IDT74FST3244

OCTALBUSSWITCH

INDUSTRIALTEMPERATURERANGE

ORDERINGINFORMATION

IDT

FST

Temp. Range

Family

Package

Device Type

Shrink Small Outline Package (SO20-7)

Small Outline IC (SO20-2)

Quarter-size Small Outline Package (SO20-8)

Thin Shrink Small Outline Package (SO20-9)

8-Bit Switch

244

Octal Bus Switch

− 40°C to +85°C

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