20-bit bus interface D-type flip-flop; positive-edge trigger; 3-state

The 74ALVT16821 high-performance Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) device combines low static and dynamic power dissipation with high speed and high output drive. It is designed for VCC operation at 2.5 V or 3.3 V with I/O compatibility to 5 V.

The 74ALVT16821 has two 10-bit, edge triggered registers, with each register coupled to a 3-state output buffer. The two sections of each register are controlled independently by the clock (nCP) and output enable (nOE) control gates.

Each register is fully edge triggered. The state of each D input, one set-up time before the LOW-to-HIGH clock transition, is transferred to the corresponding flip-flops Q output.

The 3-state output buffers are designed to drive heavily loaded 3-state buses, MOS memories, or MOS microprocessors.

The active low output enable (nOE) controls all ten 3-state buffers independent of the register operation. When nOE is LOW, the data in the register appears at the outputs. When nOE is HIGH, the outputs are in high-impedance OFF-state, which means they will neither drive nor load the bus.

Features and benefits

  • 20-bit positive-edge triggered register
  • 5 V I/O compatible
  • Multiple VCC and GND pins minimize switching noise
  • Bus hold data inputs eliminate the need for external pull-up resistors to hold unused inputs
  • Live insertion and extraction permitted
  • Power-up reset
  • Power-up 3-state
  • Output capability: +64 mA and -32 mA
  • Latch-up protection:
    • JESD78: exceeds 500 mA
  • ESD protection:
    • MIL STD 883, method 3015: exceeds 2000 V
    • Machine model: exceeds 200 V


Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)fmax (MHz)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Package name
74ALVT16821DGGProduction2.3 - 3.6TTL-32/+641.8150medium-40~859321.0TSSOP56


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Tube in DrypackActiveALVT1682174ALVT16821DGGS
( 9352 100 10512 )
Reel 13" Q1/T1 in DrypackActiveALVT1682174ALVT16821DGGY
( 9352 100 10518 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74ALVT16821DGG74ALVT16821DGGS74ALVT16821DGGAlways Pb-free50.40.81.25E922
74ALVT16821DGG74ALVT16821DGGY74ALVT16821DGGAlways Pb-free50.40.81.25E922
Quality and reliability disclaimer

Documentation (7)

File nameTitleTypeDate
74ALVT1682120-bit bus interface D-type flip-flop; positive-edge trigger; 3-stateData sheet2018-01-23
alvt16821alvt16821 IBIS modelIBIS model2013-04-07
Nexperia_Selection_guide_2020Nexperia Selection Guide 2020Selection guide2020-01-31
Nexperia_Selection_guide_2021Nexperia Selection Guide 2021Selection guide2021-01-08
alvt16alvt16 Spice modelSPICE model2013-05-06
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT364-1plastic, thin shrink small outline package; 56 leads; 0.5 mm pitch; 14 mm x 6.1 mm x 1.2 mm bodyPackage information2020-04-21


If you are in need of design/technical support, let us know and fill in the answer form, we'll get back to you shortly.


File nameTitleTypeDate
alvt16821alvt16821 IBIS modelIBIS model2013-04-07
alvt16alvt16 Spice modelSPICE model2013-05-06

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