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. ....

Features and benefits

  • 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

Parametrics

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
74HC191DB
NRND
Not for design in2.0 - 6.0+/- 5.2CMOS22low-40~12514842.0SSOP16
74HC191PWProduction2.0 - 6.0± 5.2CMOS22low-40~1251021.028.6TSSOP16

Package

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC191D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC191D74HC191D,653
( 9337 146 00653 )
Bulk Pack, CECCActive74HC191D74HC191D,652
( 9337 146 00652 )
74HC191DB
NRND

SSOP16
(SOT338-1)
SOT338-1SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC19174HC191DB,118
( 9351 886 00118 )
Bulk PackActiveHC19174HC191DB,112
( 9351 886 00112 )
74HC191PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC19174HC191PW,118
( 9351 883 70118 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
74HC191PW9351883701122018-12-312019-06-3074HC191PW

    Quality, reliability & chemical content

    Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
    74HC191D74HC191D,65374HC191Dweek 30, 200484.96.621.51E811
    74HC191D74HC191D,65274HC191Dweek 30, 200484.96.621.51E811
    74HC191DB
    NRND
    74HC191DB,11874HC191DBweek 12, 200511
    74HC191DB
    NRND
    74HC191DB,11274HC191DBweek 12, 200511
    74HC191PW74HC191PW,11874HC191PWweek 10, 200584.96.621.51E811
    Quality and reliability disclaimer

    Documentation (11)

    File nameTitleTypeDate
    74HC191Presettable synchronous 4-bit binary up/down counterData sheet2019-08-13
    AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
    HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
    SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
    SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
    SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm bodyPackage information2020-04-21
    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
    SSOP-TSSOP-VSO-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
    SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
    SOT338-1plastic, shrink small outline package; 16 leads; 0.65 mm pitch; 6.2 mm x 5.3 mm x 2 mm bodyPackage information2020-04-21

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