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    74HC161

    Presettable synchronous 4-bit binary counter; asynchronous reset

    The 74HC161 is a synchronous presettable binary counter with an internal look-head carry. Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock (CP). The outputs (Q0 to Q3) of the counters may be preset HIGH or LOW. A LOW at the parallel enable input (PE) disables the counting action and causes the data at the data inputs (D0 to D3) to be loaded into the counter on the positive-going edge of the clock. Preset takes place regardless of the levels at count enable inputs (CEP and CET). A LOW at the master reset input (MR) sets Q0 to Q3 LOW regardless of the levels at input pins CP, PE, CET and CEP (thus providing an asynchronous clear function). The look-ahead carry simplifies serial cascading of the counters. Both CEP and CET must be HIGH to count. The CET input is fed forward to enable the terminal count output (TC). The TC output thus enabled will produce a HIGH output pulse of a duration approximately equal to a HIGH output of Q0. This pulse can be used to enable the next cascaded stage. The maximum clock frequency for the cascaded counters is determined by the CP to TC propagation delay and CEP to CP set-up time, according to the following formula:

    Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

    特性

    • Wide supply voltage range from 2.0 V to 6.0 V

    • CMOS low power dissipation

    • High noise immunity

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

    • Complies with JEDEC standards:

      • JESD8C (2.7 V to 3.6 V)
      • JESD7A (2.0 V to 6.0 V)
    • CMOS input levels

    • Synchronous counting and loading

    • 2 count enable inputs for n-bit cascading

    • Asynchronous reset

    • Positive-edge triggered clock

    • 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 -40 °C to +125 °C

    参数类型

    Type numberProduct statusVCC (V)Output drive capability (mA)Logic switching levelstpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
    74HC161DProduction2.0 - 6.0± 5.2CMOS19low-40~125835.241SO16
    74HC161PWProduction2.0 - 6.0± 5.2CMOS19low-40~1251162.544.8TSSOP16

    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))
    74HC161D
    SO16
    (SOT109-1)
    SOT109-1SO-SOJ-REFLOW
    SO-SOJ-WAVE
    SOT109-1_653Active74HC161D74HC161D,653
    ( 9337 145 20653 )
    74HC161PW
    TSSOP16
    (SOT403-1)
    SOT403-1SSOP-TSSOP-VSO-WAVE
    SOT403-1_118ActiveHC16174HC161PW,118
    ( 9351 883 20118 )

    下表中的版本已停产。参见表 停产信息 了解更多信息。

    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))
    74HC161D
    SO16
    (SOT109-1)
    SOT109-1SO-SOJ-REFLOW
    SO-SOJ-WAVE
    SOT109-1_652Withdrawn / End-of-life74HC161D74HC161D,652
    ( 9337 145 20652 )

    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
    74HC161D9337145206522021-12-312022-06-3074HC161D
      74HC161PW9351883201122021-12-312022-06-3074HC161PW

        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
        74HC161D74HC161D,65374HC161Dweek 30, 2004
        74HC161PW74HC161PW,11874HC161PWweek 10, 2005

        下表中的版本已停产。参见表 停产信息 了解更多信息。

        型号可订购的器件编号化学成分RoHSRHF指示符无铅转换日期
        74HC161D74HC161D,65274HC161Dweek 30, 2004
        品质及可靠性免责声明

        文档 (10)

        文件名称标题类型日期
        74HC161Presettable synchronous 4-bit binary counter; asynchronous resetData sheet2024-03-11
        AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
        hcHC/HCT Spice modelSPICE model2022-02-17
        HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
        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
        SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm bodyPackage information2023-11-08
        SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08

        支持

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        模型

        文件名称标题类型日期
        hcHC/HCT Spice modelSPICE model2022-02-17

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