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74HC161D ECAD models PCB Symbol, Footprint & ECAD Model

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:

fmax= 1 / ( tP(max)(CPtoTC) + tSU(CEPtoCP) ).

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

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74HC161D 74HC161D,653 933714520653 SOT109-1 Order product
74HC161D 74HC161D,652 933714520652 SOT109-1 Order product

Features

  • Complies with JEDEC standard no. 7A
  • Input levels:
    • For 74HC161: CMOS level
  • Synchronous counting and loading
  • 2 count enable inputs for n-bit cascading
  • Asynchronous reset
  • Positive-edge triggered clock
  • ESD protection: category:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Multiple package options
  • Specified from -40 °C to +85 °C and -40 °C to +125 °C

Target applications

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
74HC161DProduction2.0 - 6.0± 5.2CMOS19low-40~125835.241SO16

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
74HC161D74HC161D,653
( 9337 145 20653 )
Active74HC161D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECC
74HC161D,652
( 9337 145 20652 )
Active74HC161DBulk Pack, CECC

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
74HC161D74HC161D,65374HC161D84.96.621.51E811
74HC161D74HC161D,65274HC161D84.96.621.51E811
Quality and reliability disclaimer

Documentation (7)

File nameTitleTypeDate
74HC161Presettable synchronous 4-bit binary counter; asynchronous resetData sheet2018-10-04
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
hchc Spice modelSPICE model2013-05-06
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 bodyOutline drawing2018-10-18

Support

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Models

File nameTitleTypeDate
hchc Spice modelSPICE model2013-05-06

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74HC161D74HC161D,653933714520653Reel 13" Q1/T1 CECCOrder product
74HC161D74HC161D,652933714520652Bulk Pack, CECCOrder product

Sample

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