74HC4538N

Dual retriggerable precision monostable multivibrator


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The 74HC4538; 74HCT4538 are high-speed Si-gate CMOS devices and are pin compatible with Low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HC4538; 74HCT4538 are dual retriggerable-resettable monostable multivibrators. Each multivibrator has an active LOW trigger/retrigger input (nA), an active HIGH trigger/retrigger input (nB), an overriding active LOW direct reset input (nCD), an output (nQ) and its complement (nQ), and two pins (nREXT/CEXT and nCEXT) for connecting the external timing components CEXT and REXT. Typical pulse width variation over the specified temperature range is ±0.2 %.

The multivibrator may be triggered by either the positive or the negative edges of the input pulse. The duration and accuracy of the output pulse are determined by the external timing components CEXT and REXT. The output pulse width (tW) is equal to 0.7 × REXT × CEXT. The linear design techniques guarantee precise control of the output pulse width. A LOW level at nCD terminates the output pulse immediately. Schmitt trigger action on pins nA and nB makes the circuit highly tolerant of slower rise and fall times.

Features and benefits

  • Tolerant of slow trigger rise and fall times
  • Separate reset inputs
  • Triggering from falling or rising edge
  • Multiple package options
  • ESD protection:
    • HBM JESD22-A114E exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C
All information on this product information page is subject to the subsequent disclaimers:
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Show functional diagram

Block diagram: 74HC4538D, 74HC4538DB, 74HC4538N, 74HC4538PW, 74HC4538U, 74HCT4538D, 74HCT4538DB, 74HCT4538N, 74HCT4538PW
Block diagram: 74HC4538D, 74HC4538DB, 74HC4538N, 74HC4538PW, 74HC4538U, 74HCT4538D, 74HCT4538DB, 74HCT4538N, 74HCT4538PW

Parametrics of this product

Type numberPackageNr of pinsPackage nameProduct statustpd(ns)VCC(V)FamilyPower dissipation considerationsLogic switching levelsOutput drive capability(mA)DescriptionTamb(Cel)
74HC4538NSOT38-4
(DIP16)		16DIP16Production272.0 - 6.0HC(T)lowCMOS+/- 5.2dual retriggerable precision monostable multivibrator-40~125

Package

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
74HC4538N74HC4538N,6529336 698 40652Volume productionSOT38-4
(DIP16) 		Bulk Pack, CECC74HC4538N

Outline drawing

Package VersionPackage NamePackage DescriptionReference CodesIssue Date
SOT38-4DIP16plastic dual in-line package; 16 leads (300 mil)2003-02-13

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
74HC4538N74HC4538N,65274HC4538NAlways Pb-free6.621.5105740181268883E8NANA
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Documentation for this product

File nameTitleTypeFormatDate
74HC_HCT4538Dual retriggerable precision monostable multivibratorData sheetpdf2012-06-08
AN11044Pin FMEA 74HC/74HCT familyApplication notepdf2011-03-16
AN252Live Insertion Aspects of Philips Logic FamiliesApplication notepdf2013-03-13
hchc Spice modelSPICE modelzip2013-05-07
HCT_USER_GUIDEHC/T User GuideUser manualpdf1997-11-01

Ordering & availability

Type numberOrdering code (12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
74HC4538N9336 698 4065274HC4538N,652EUAVNET EXPRESS EUROPE2,1255/17/2013Buy online 
   NAMOUSER ELECTRONICS1,9735/17/2013Buy online 
   NANewark element141,84815/17/2013Buy online 
   NADIGI-KEY CORPORATION1,6295/17/2013Buy online 
   EUARROW EUROPE1,6005/8/2013Buy online 
   EUFarnell Europe1,128105/17/2013Buy online 
   NAARROW ELECTRONICS1,1005/17/2013Buy online 
   NANEWARK/ELEMENT149945/17/2013Buy online 
   ASIAElement 1499117/05/2013Buy online 
   JAPANCHIP ONE STOP6505/17/2013Buy online 

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