74LVC161DB NRND

Presettable synchronous 4-bit binary counter; asynchronous reset

The 74LVC161 is a synchronous presettable binary counter which features an internal look-ahead carry and can be used for high-speed counting. Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock (pin CP). The outputs (pins Q0 to Q3) of the counters may be preset to a HIGH-level or LOW-level. A LOW-level at the parallel enable input (pin PE) disables the counting action and causes the data at the data inputs (pins D0 to D3) to be loaded into the counter on the positive-going edge of the clock (provided that the set-up and hold time requirements for PE are met). Preset takes place regardless of the levels at count enable inputs (pins CEP and CET). A LOW-level at the master reset input (pin MR) sets all four outputs of the flip-flops (pins Q0 to Q3) to LOW-level 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 count enable inputs (pin CEP and CET) must be HIGH to count. The CET input is fed forward to enable the terminal count output (pin TC). The TC output thus enabled will produce a HIGH output pulse of a duration approximately equal to a HIGH-level 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 tPHL (propagation delay CP to TC) and tsu (set-up time CEP to CP) according to the formula: fmax = 1/ (tPHL(max)+tsu)

It is a high-performance, low-power, low-voltage, Si-gate CMOS device and superior to most advanced CMOS compatible TTL families.

Not recommended for new designs (NRND), click here for the alternative product.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74LVC161DB 74LVC161DB,118 935210520118 SOT338-1 Order product
74LVC161DB 74LVC161DB,112 935210520112 SOT338-1 Order product

Features

  • 5 V tolerant inputs for interfacing with 5 V logic
  • Wide supply voltage range from 1.2 V to 3.6 V
  • CMOS low power consumption
  • Direct interface with TTL levels
  • Asynchronous reset
  • Synchronous counting and loading
  • Two count enable inputs for n-bit cascading
  • Positive edge-triggered clock
  • Complies with JEDEC standard:
    • JESD8-7A (1.65 V to 1.95 V)
    • JESD8-5A (2.3 V to 2.7 V)
    • JESD8-C/JESD36 (2.7 V to 3.6 V)
  • Specified from -40 °C to +85 °C and -40 °C to +125 °C
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-B exceeds 200 V
    • CDM JESD22-C101E exceeds 1000 V

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)Package name
74LVC161DB
NRND
Not for design in1.2 - 3.6+/- 24CMOS/LVTTL4.9low-40~12514842.0SSOP16

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
74LVC161DB
NRND
74LVC161DB,118
( 9352 105 20118 )
ActiveLVC161
SSOP16
(SOT338-1)
SOT338-1SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFMSLMSL leadfree
74LVC161DB
NRND
74LVC161DB,11874LVC161DB11
Quality and reliability disclaimer

Documentation (7)

File nameTitleTypeDate
74LVC161Presettable synchronous 4-bit binary counter; asynchronous resetData sheet2017-05-03
AN11009Pin FMEA for LVC familyApplication note2019-01-09
lvc161lvc161 IBIS modelIBIS model2013-04-07
lvclvc Spice modelSPICE model2013-05-06
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SSOP-TSSOP-VSO-REFLOWFootprint for reflow solderingReflow 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 bodyOutline drawing2018-10-18

Support

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Models

File nameTitleTypeDate
lvc161lvc161 IBIS modelIBIS model2013-04-07
lvclvc Spice modelSPICE model2013-05-06

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74LVC161DB74LVC161DB,118935210520118Reel 13" Q1/T1Order product
74LVC161DB74LVC161DB,112935210520112Bulk PackOrder product

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