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20-bit bus interface D-type flip-flop; positive-edge trigger with 30 Ohm termination resistors; 3-state

The 74ALVT162821 is a 20-bit positive-edge triggered D-type flip-flop with 30 Ω termination resistors and 3-state outputs

The device can be used as two 10-bit flip-flops or one 20-bit flip-flop. The device features two clocks (1CP and 2CP) and two output enables (1OE and 2OE), each controlling 10-bits. The flip-flops will store the state of their individual D-inputs that meet the set-up and hold time requirements on the LOW-to-HIGH clock (nCP) transition. A HIGH on nOE causes the outputs to assume a high-impedance OFF-state. Operation of the nOE input does not affect the state of the flip-flops. Bus hold data inputs eliminate the need for external pull-up resistors to define unused inputs

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74ALVT162821DGG 74ALVT162821DGGS 935255460512 SOT364-1 Order product
74ALVT162821DGG 74ALVT162821DGGY 935255460518 SOT364-1 Order product

Features and benefits

  • Wide supply voltage range from 2.3 V to 3.6 V
  • Overvoltage tolerant inputs to 5.5 V
  • BiCMOS high speed and output drive
  • Outputs include series resistance of 30 Ω making external termination resistors unnecessary
  • No bus current loading when output is tied to 5 V bus
  • Direct interface with TTL levels
  • IOFF circuitry provides partial Power-down mode operation
  • 20-bit positive-edge triggered register
  • 5 V I/O compatible
  • Multiple VCC and GND pins minimize switching noise
  • Bus hold on data inputs
  • Live insertion and extraction permitted
  • Power-up reset
  • Power-up 3-state
  • Output capability: +12 mA and -12 mA
  • Latch-up protection:
    • JESD17: exceeds 500 mA
  • ESD protection:
    • MIL STD 883, method 3015: exceeds 2000 V
    • MM: exceeds 200 V
  • Specified from -40 °C to 85 °C



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
74ALVT162821DGGProduction2.3 - 3.6TTL± 123.2150medium-40~859321.0TSSOP56


Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackagePackage informationReflow-/Wave solderingPacking
( 9352 554 60512 )
Tube in Drypack
( 9352 554 60518 )
ActiveALVT162821Reel 13" Q1/T1 in Drypack

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
Quality and reliability disclaimer

Documentation (4)

File nameTitleTypeDate
74ALVT16282120-bit bus interface D-type flip-flop; positive-edge trigger with 30 Ω termination resistors; 3-stateData sheet2020-10-19
alvt162821alvt162821 IBIS modelIBIS model2013-04-07
alvt16alvt16 Spice modelSPICE model2013-05-06
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08


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
alvt162821alvt162821 IBIS modelIBIS model2013-04-07
alvt16alvt16 Spice modelSPICE model2013-05-06

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74ALVT162821DGG74ALVT162821DGGS935255460512Tube in DrypackOrder product
74ALVT162821DGG74ALVT162821DGGY935255460518Reel 13" Q1/T1 in DrypackOrder product


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