18-bit bus-interface D-type latch; 3-state

The 74ALVCH16843 has two 9-bit D-type latch featuring separate D-type inputs for each latch and 3-State outputs for bus oriented applications. The two sections of each register are controlled independently by the latch enable (nLE) clear (nCLR) preset (nPRE) and output enable (nOE) control gates.

When nOE is LOW, the data in the registers appear at the outputs. When nOE is HIGH, the outputs are in the high impedance OFF state. Operation of the nOE input does not affect the state of the flip-flops.

The 74ALVCH16843 has active bus hold circuitry which is provided to hold unused or floating data inputs at a valid logic level. This feature eliminates the need for external pull-up or pull-down resistors.


  • Wide supply voltage range of 1.2 V to 3.6 V
  • Complies with JEDEC standard no. 8-1A.
  • CMOS low power consumption
  • Direct interface with TTL levels
  • Current drive ±24 mA at 3.0 V
  • MULTIBYTE™™ flow-through standard pin-out architecture
  • Low inductance multiple VCC and GND pins for minimum noise and ground bounce
  • All data inputs have bus hold
  • Output drive capability 50 Ω transmission lines @ 85 °C


Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)No of bitsPower dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Package name
74ALVCH16843DGGProduction2.3 - 3.6LVTTL± 242.118low-40~859321.0TSSOP56


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Tube in DrypackActiveALVCH1684374ALVCH16843DGGS
( 9352 591 10512 )
Reel 13" Q1/T1 in DrypackActiveALVCH1684374ALVCH16843DGGY
( 9352 591 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
74ALVCH16843DGG74ALVCH16843DGGS74ALVCH16843DGGAlways Pb-free123.83.872.58E822
74ALVCH16843DGG74ALVCH16843DGGY74ALVCH16843DGGAlways Pb-free123.83.872.58E822
Quality and reliability disclaimer

Documentation (4)

File nameTitleTypeDate
74ALVCH1684318-bit bus-interface D-type latch; 3-stateData sheet2017-11-21
alvch16843alvch16843 IBIS modelIBIS model2013-04-07
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


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File nameTitleTypeDate
alvch16843alvch16843 IBIS modelIBIS model2013-04-07

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