74ACT16244MTD中文资料

© Semiconductor Components Industries, LLC, 2006June, 2006 − Rev. 51Publication Order Number:

74VCX16244/D74VCX16244

Low−Voltage 1.8V/2.5V/3.3V

16−Bit Buffer

With 3.6 V−Tolerant Inputs and Outputs

(3−State, Non−Inverting)

The 74VCX16244 is an advanced performance, non−inverting16−bit buffer. It is designed for very high−speed, very low−poweroperation in 1.8 V, 2.5 V or 3.3 V systems.When operating at 2.5 V (or 1.8 V) the part is designed to toleratevoltages it may encounter on either inputs or outputs when interfacingto 3.3 V busses. It is guaranteed to be overvoltage tolerant to 3.6 V.

The 74VCX16244 is nibble controlled with each nibble functioningidentically, but independently. The control pins may be tied together toobtain full 16−bit operation. The 3−state outputs are controlled by anOutput Enable (OEn) input for each nibble. When OEn is LOW, theoutputs are on. When OEn is HIGH, the outputs are in the highimpedance state.

74HC14中文资料

74HC14的作用：六反相斯密特触发器真值表：Y=A

Input输入output输出

AY

LH

HL

图1引脚功能极限参数：SupplyVoltage电源电压7VInputVoltage输入电压7VOperatingFreeAirTemperatureRange自由空气温度范围0℃to+70℃

StorageTemperatureRange储存温度范围-65℃to+150℃RecommendedOperatingConditions建议操作条件Symbol符号Parameter参数最小典型最大UNIT单位

VCCSupplyVoltage电源电压4.7555.25V

VT+Positive-GoingInputThresholdVoltage正向输入阈值电压(Note2)1.41.61.9V

VT-Negative-GoingInputThresholdVoltage反向输入阈值电压(Note2)0.50.81V

HYSInputHysteresis输入滞后(Note2)0.40.8-V

IOHHIGHLevelOutputCurrent高电平输出电流---0.4mA

IOLLOWLevelOutputCurrent低电平输出电流--8mA

TAFreeAirOperatingTemperature工作温度0-70℃

Note2:VCC=5V.

ElectricalCharacteristics电气特性

overrecommendedoperatingfreeairtemperaturerange(unlessotherwisenoted)Symbol符号Parameter参数Conditions条件最小典型最大UNIT单位

VIInputClampVoltage输入钳位电压VCC=最小,II=-18mA---1.5V

VOHHIGHLevelOutputVoltage输出高电平电压VCC=最小,IOH=最大VIL=最大2.73.4-V

AC244中文资料

MC74AC244, MC74ACT244Octal Buffer/Line Driver with 3-State Outputs

The MC74AC244/74ACT244 is an octal buffer and line driver

designed to be employed as a memory address driver, clock

driver and bus oriented transmitter/receiver which provides

improved PC board density.

3–State Outputs Drive Bus Lines or Buffer Memory Address

Registers

Outputs Source/Sink 24 mA

′ACT244 Has TTL Compatible Inputs

V OE OE 1

GND

Figure 1. Pinout: 20–Lead Packages Conductors (Top View)

NOTE:

H = HIGH Voltage Level L = LOW Voltage Level X =

Immaterial

Z = High Impedance

NOTE:

H = HIGH Voltage Level L = LOW Voltage Level X =

Immaterial

Z = High Impedance

1

PDIP–20N SUFFIX

CASE 738

1

1 1 SO–20DW SUFFIX CASE 751

TSSOP–20DT SUFFIX CASE 948E EIAJ–20M SUFFIX CASE 967

Device

Package Shipping ORDERING INFORMATION

MC74AC244N PDIP–2018 Units/Rail MC74ACT244N PDIP–2018 Units/Rail MC74AC244DW SOIC–2038 Units/Rail

74LVT2244

3󰀟3V

ABT

Octal

Buffer󰁋Line

Driver

with

TRI-STATE

Outputs

ADVANCEINFORMATION

December1996

74LVT2244

3󰀟3VABTOctalBuffer󰁋LineDriver

withTRI-STATE󰀃Outputs

GeneralDescription

TheLVT2244isanoctalbufferandlinedriverdesignedto

beemployedasamemoryaddressdriver󰀷clockdriverand

busorientedtransmitterorreceiverwhichprovidesim-

provedPCboarddensity󰀟Theequivalent25X-Seriesresis-

torhelpsreduceoutputovershootandundershoot󰀟

Theseoctalbuffersandlinedriversaredesignedforlow-

voltage(3󰀟3V)VCCapplications󰀷butwiththecapabilityto

provideaTTLinterfacetoa5Venvironment󰀟TheLVT2244

isfabricatedwithanadvancedBiCMOStechnologyto

achievehighspeedoperationsimilarto5VABTwhilemain-

tainingalowpowerdissipation󰀟Features

YInputandoutputinterfacecapabilitytosystemsat5V

VCC

YBus-Holddatainputseliminatetheneedforexternal

pull-upresistorstoholdunusedinputs