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74HCT221

Dual non-retriggerable monostable multivibrator with reset

The 74HCT221 is a dual non-retriggerable monostable multivibrator. Each multivibrator features edge-triggered inputs (nA and nB), either of which can be used as an enable input. Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. Schmitt-trigger input circuitry for the nB inputs allow jitter-free triggering from inputs with slow transition rates, providing the circuit with excellent noise immunity. Once triggered, the outputs (nQ, nQ) are independent of further transitions of nA and nB inputs. The output pulse width is defined by the following relationship:

  • tW = 0.7 × CEXTREXT

The output pulses can be terminated by the active LOW reset inputs (nRD). Pulse width stability is achieved through internal compensation and is virtually independent of VCC and temperature. In most applications pulse stability will only be limited by the accuracy of the external timing components . This device features reduced input threshold levels to allow interfacing to TTL logic levels. Inputs also include clamp diodes, this enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

特性

  • Supply voltage range from 4.5 V to 5.5 V

  • CMOS low power dissipation

  • High noise immunity

  • Input levels:

    • For 74HCT221: TTL level

  • Pulse width variance is typically less than ±5%

  • Direct reset terminates output pulse

  • Schmitt-trigger action on nB inputs

  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

  • ESD protection:
    • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V

    • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V

  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

参数类型

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HCT221DProduction4.5 - 5.5TTL± 432low-40~125621.019SO16

封装

型号封装尺寸版本回流焊/波峰焊包装状态标示可订购的器件编号,(订购码(12NC))
74HCT221D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_118Active74HCT221D74HCT221D,118
( 9337 151 10118 )

停产信息

型号可订购的器件编号,(订购码(12NC))最后一次购买日期最后一次交货日期替代产品状态备注
74HCT221D9337151101122021-12-312022-06-3074HCT221D

    环境信息

    型号可订购的器件编号化学成分RoHSRHF指示符无铅转换日期
    74HCT221D74HCT221D,11874HCT221Dweek 4, 2004
    品质及可靠性免责声明

    文档 (6)

    文件名称标题类型日期
    74HCT221Dual non-retriggerable monostable multivibrator with resetData sheet2024-04-04
    74HCT221D_Nexperia_Product_Reliability74HCT221D Nexperia Product ReliabilityQuality document2023-05-29
    SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
    SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
    WAVE_BG-BD-1Wave soldering profileWave soldering2021-09-08
    SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm bodyPackage information2023-11-07

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