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74HC191

Presettable synchronous 4-bit binary up/down counter

The 74HC191 is an asynchronously presettable 4-bit binary up/down counter. It contains four master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operation. Asynchronous parallel load capability permits the counter to be preset to any desired value. Information present on the parallel data inputs (D0 to D3) is loaded into the counter and appears on the outputs when the parallel load (PL) input is LOW. This operation overrides the counting function. Counting is inhibited by a HIGH level on the count enable (CE) input. When CE is LOW internal state changes are initiated synchronously by the LOW-to-HIGH transition of the clock input. The up/down (U/D) input signal determines the direction of counting as indicated in the function table. The CE input may go LOW when the clock is in either state, however, the LOW-to-HIGH CE transition must occur only when the clock is HIGH. Also, the U/D input should be changed only when either CE or CP is HIGH. Overflow/underflow indications are provided by two types of outputs, the terminal count (TC) and ripple clock (RC). The TC output is normally LOW and goes HIGH when a circuit reaches zero in the count-down mode or reaches '15' in the count-up-mode. The TC output will remain HIGH until a state change occurs, either by counting or presetting, or until U/D is changed. ....

特性

  • Complies with JEDEC standard no. 7A
  • CMOS input levels
  • Synchronous reversible counting
  • Asynchronous parallel load
  • Count enable control for synchronous expansion
  • Single up/down control input
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 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
74HC191DProduction2.0 - 6.0± 5.2CMOS22low-40~125671.024SO16
74HC191PWProduction2.0 - 6.0± 5.2CMOS22low-40~1251021.028.6TSSOP16

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))
74HC191D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC191D74HC191D,653
( 9337 146 00653 )
74HC191PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC19174HC191PW,118
( 9351 883 70118 )

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))
74HC191D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HC191D74HC191D,652
( 9337 146 00652 )

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
74HC191D933714600652
74HC191PW9351883701122018-12-312019-06-3074HC191PW

    品质、可靠性及化学成分

    型号可订购的器件编号化学成分RoHS / RHF无铅转换日期EFRIFRMTBF(小时)MSLMSL无铅
    74HC191D74HC191D,65374HC191Dweek 30, 200439.31.37.69E811
    74HC191PW74HC191PW,11874HC191PWweek 10, 200539.31.37.69E811

    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RoHS / RHF无铅转换日期EFRIFRMTBF(小时)MSLMSL无铅
    74HC191D74HC191D,65274HC191Dweek 30, 200439.31.37.69E811
    品质及可靠性免责声明

    文档 (9)

    文件名称标题类型日期
    74HC191Presettable synchronous 4-bit binary up/down counterData sheet2021-09-08
    AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
    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
    SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm bodyPackage information2021-01-06
    WAVE_BG-BD-1Wave soldering profileWave soldering2021-09-08
    SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
    SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyPackage information2020-04-21

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