74LVC244ADB-T中文资料

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Product speci cation

Supersedes data of 2003May20

2003Oct30

Octal buffer/line driver with 5 V tolerantinputs/outputs (3-state)

FEATURES

5V tolerant inputs/outputs for interfacing with 5V logic Wide supply voltage range from 1.2to3.6V CMOS low power consumption Direct interface with TTL levels Inputs accept voltages up to 5.5V High-impedance when VCC=0V

Bushold on all data inputs (74LVCH244A only) Complies with JEDEC standard no. 8-1A ESD protection:

HBM EIA/JESD22-A114-A exceeds 2000VMM EIA/JESD22-A115-A exceeds 200V. Specified from 40to+85°C and 40to+125°C.

DESCRIPTION

74LVC244A;74LVCH244A

The 74LVC244A/74LVCH244A is a high performance,low-power,low-voltage,Si-gateCMOSdevice,superiortomost advanced CMOS compatible TTL families.

Inputs can be driven from either 3.3or5V devices. In3-stateoperation,outputscanhandle5V.Thesefeaturesallow the use of these devices as translators in a mixed3.3and5V environment.

The 74LVC244A/74LVCH244A is an octal non-invertingbuffer/linedriverwith3-stateoutputs.The3-stateoutputshigh-impedance OFF-state. Schmitt-trigger action at allinputsmakesthecircuithighlytolerantforslowerinputriseand fall times.

The244isfunctionallyidenticaltothe240,butthe240hasinverting outputs.

QUICK REFERENCE DATA

GND=0V; Tamb=25°C; tr=tf≤2.5ns.Notes

1.CPDis used to determine the dynamic power dissipation (PDinµW).

PD=CPD×VCC2×fi×N+Σ(CL×VCC2×fo)where:fi=input frequency in MHz;fo=output frequency in MHz;CL=output load capacitance inpF;VCC=supply voltage in Volts;N=total load switching outputs;Σ(CL×VCC2×fo)=sum of the outputs.2.The condition is VI=GNDtoVCC.

inputs/outputs (3-state)

ORDERING INFORMATION

74LVC244A; 74LVCH244A

FUNCTION TABLESee note1.

Note

1.H=HIGH voltage level;

a)L=LOW voltage level;b)X=don’t care;

c)Z=high-impedance OFF-state.

inputs/outputs (3-state)

PINNING

74LVC244A; 74LVCH244A

inputs/outputs (3-state)

74LVC244A; 74LVCH244A

inputs/outputs (3-state)

RECOMMENDED OPERATING CONDITIONS

74LVC244A; 74LVCH244A

LIMITING VALUES

InaccordancewiththeAbsoluteMaximumRatingSystem(IEC60134);voltagesarereferencedtoGND(ground=0V).Notes

1.The input and output voltage ratings may be exceeded if the input and output current ratings are observed.2.For SO20 packages: above 70°C derate linearly with 8mW/K.

a)For SSOP20 and TSSOP20 packages: above 60°C derate linearly with 5.5mW/K.b)For DHVQFN20 packages: above 60°C derate linearly with 5.5mW/K.

inputs/outputs (3-state)

74LVC244A; 74LVCH244A

DCCHARACTERISTICS

At recommended operating conditions; voltages are referenced to GND (ground=0V).

inputs/outputs (3-state)

74LVC244A; 74LVCH244A

Notes

1.All typical values are measured at VCC=3.3V and Tamb=25°C.

2.For bushold parts, the bushold circuit is switched off when VI>VCC allowing 5.5V on the input pin.

3.Validfordatainputsofbusholdparts(74LVCH244A)only.Fordatainputsonly,controlinputsdonothaveabushold

circuit.4.The specified sustaining current at the data inputs do not have a bushold circuit.

5.The specified overdrive current at the data input forces the data input to the opposite logic input state.

inputs/outputs (3-state)

ACCHARACTERISTICSGND=0V; tr=tf≤2.5ns.74LVC244A; 74LVCH244A

Notes

1.All typical values are measured at VCC=3.3V and Tamb=25°C.

2.Skewbetweenanytwooutputsofthesamepackageswitchinginthesamedirection.Thisparameterisguaranteed

by design.

inputs/outputs (3-state)

ACWAVEFORMS

74LVC244A; 74LVCH244A

inputs/outputs (3-state)

74LVC244A; 74LVCH244A

inputs/outputs (3-state)

PACKAGE OUTLINES

SO20: plastic small outline package; 20 leads; body width 7.5 mm

74LVC244A; 74LVCH244A

SOT163-1

inputs/outputs (3-state)

74LVC244A; 74LVCH244A

SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mmSOT339-1

inputs/outputs (3-state)

74LVC244A; 74LVCH244A

TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mmSOT360-1

inputs/outputs (3-state)

74LVC244A; 74LVCH244A

DHVQFN20: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads;

SOT764-120 terminals; body 2.5 x 4.5 x 0.85 mm

inputs/outputs (3-state)

DATA SHEET STATUS74LVC244A; 74LVCH244A

Notes

1.Please consult the most recently issued data sheet before initiating or completing a design.

2.The product status of the device(s) described in this data sheet may have changed since this data sheet was

published. The latest information is available on the Internet at URL .3.Fordatasheetsdescribingmultipletypenumbers,thehighest-levelproductstatusdeterminesthedatasheetstatus.

DEFINITIONS

Short-form specification The data in a short-formspecification is extracted from a full data sheet with thesame type number and title. For detailed information seethe relevant data sheet or data handbook.

Limitingvaluesdefinition Limitingvaluesgivenareinaccordance with the Absolute Maximum Rating System(IEC60134). Stress above one or more of the limitingvalues may cause permanent damage to the device.

These are stress ratings only and operation of the deviceattheseoratanyotherconditionsabovethosegivenintheCharacteristicssectionsofthespecificationisnotimplied.Exposure to limiting values for extended periods mayaffect device reliability.

Application information Applications that aredescribed herein for any of these products are for

illustrative purposes only. Philips Semiconductors makenorepresentationorwarrantythatsuchapplicationswillbesuitable for the specified …… 此处隐藏：5345字，全部文档内容请下载后查看。喜欢就下载吧 ……