74HC6323A; 74HCT6323A

Programmable ripple counter with oscillator; 3-state

The 74HC6323A; 74HCT6323A is an oscillator designed for quartz crystal combined with a programmable 3-state counter, a 3-state output buffer and an overriding asynchronous master reset (MR). With the two select inputs S1 and S2 the counter can be switched in the divide-by-1, 2, 4 or 8 mode. If left floating the clock is divided by 8. The oscillator is designed to operate either in the fundamental or third overtone mode depending on the crystal and external components applied. On-chip capacitors minimize external component count for third overtone crystal applications. The oscillator may be replaced by an external clock signal at input X1. In this event the other oscillator pin (X2) must be floating. The counter advances on the negative-going transition of X1. A LOW level on MR resets the counter, stops the oscillator and sets the output buffer in the 3-state condition. MR can be left floating since an internal pull-up resistor will make the MR inactive.

The X1 input has CMOS input switching levels and may be driven by a TTL output using a pull-up resistor connected to VCC. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features and benefits

  • Programmable 3-stage ripple counter
  • Suitable for over-tone crystal application up to 50 MHz (VCC = 5 V ± 10%)
  • 3-state output buffer
  • Two internal capacitors
  • Recommended operating range for use with third overtone crystals 3 to 6 V
  • Oscillator stop function (MR)
  • Input levels:
    • For 74HC6323: CMOS level
    • For 74HCT6323: TTL level
  • ESD protection:
    • HBM JESD22-A114-A exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C


  • Control counters
  • Timers
  • Frequency dividers
  • Time-delay circuits
  • CIO (Compact Integrated Oscillator)
  • Third-overtone crystal operation


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
74HC6323ADProduction2.0 - 6.0± 7.8CMOS17low-40~12515843.0SO8
74HCT6323ADProduction4.5 - 5.5± 4TTL17low-40~12515843.0SO8


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Reel 13" Q1/T1Active7C6323A74HC6323AD,118
( 9350 137 10118 )
Bulk PackActive7C6323A74HC6323AD,112
( 9350 137 10112 )
Reel 13" Q1/T1Active7T6323A74HCT6323AD,118
( 9350 137 20118 )
Bulk PackActive7T6323A74HCT6323AD,112
( 9350 137 20112 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC6323AD74HC6323AD,11874HC6323ADweek 6, 200584.96.621.51E811
74HC6323AD74HC6323AD,11274HC6323ADweek 6, 200584.96.621.51E811
74HCT6323AD74HCT6323AD,11874HCT6323ADweek 6, 200584.96.621.51E811
74HCT6323AD74HCT6323AD,11274HCT6323ADweek 6, 200584.96.621.51E811
Quality and reliability disclaimer

Documentation (4)

File nameTitleTypeDate
74HC_HCT6323AProgrammable ripple counter with oscillator; 3-stateData sheet2018-07-09
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT96-1plastic, small outline package; 8 leads; 1.27 mm pitch; 4.9 mm x 3.9 mm x 1.75 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.

Ordering, pricing & availability


As a Nexperia customer you can order samples via our sales organization or directly via our Online Sample Store: https://extranet.nexperia.com.

Sample orders normally take 2-4 days for delivery.

If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples.