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.

This product has been discontinued, click here for discontinuation information and replacement parts.

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 number Product status VCC (V) Output drive capability (mA) Logic switching levels tpd (ns) Power dissipation considerations Tamb (°C) Rth(j-a) (K/W) Ψth(j-top) (K/W) Package name
74HC6323AD End of life 2.0 - 6.0 ± 7.8 CMOS 17 low -40~125 158 43.0 SO8

PCB Symbol, Footprint and 3D Model

Model Name Description


All type numbers in the table below are discontinued. See the table Discontinuation information for more information.

Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
74HC6323AD 74HC6323AD,112
Obsolete 7C6323A SOT96-1
Not available
Obsolete 7C6323A SOT96-1_118

Environmental information

All type numbers in the table below are discontinued. See the table Discontinuation information for more information.

Type number Orderable part number Chemical content RoHS RHF-indicator
74HC6323AD 74HC6323AD,112 74HC6323AD rohs rhf rhf
74HC6323AD 74HC6323AD,118 74HC6323AD rohs rhf rhf
Quality and reliability disclaimer

Documentation (15)

File name Title Type Date
74HC_HCT6323A Programmable ripple counter with oscillator; 3-state Data sheet 2018-07-09
AN11044 Pin FMEA 74HC/74HCT family Application note 2019-01-09
HCT_USER_GUIDE HC/T User Guide User manual 1997-10-31
Nexperia_package_poster Nexperia package poster Leaflet 2020-05-15
SO8_SOT96-1_mk plastic, small outline package; 8 leads; 1.27 mm pitch; 4.9 mm x 3.9 mm x 1.75 mm body Marcom graphics 2017-01-28
SOT96-1_115 Tape reel SMD; standard product orientation 12NC ending 115 Packing information 2020-04-27
SOT96-1_118 SO8; Reel pack for SMD, 13''; Q1/T1 product orientation Packing information 2022-12-21
SOT96-1_431 SO8; Reel sulfur barrier pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431 Packing information 2020-04-27
SOT96-1_515 SO8; Reel dry pack; SMD, 7" Q1/T1 Standard product orientation Orderable part number ending, 515 or Z Ordering code (12NC) ending 515 Packing information 2020-04-27
SOT96-1_518 SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending, 518 or Y Ordering code (12NC) ending 518 Packing information 2020-04-27
SO-SOJ-REFLOW Footprint for reflow soldering Reflow soldering 2009-10-08
SO-SOJ-WAVE Footprint for wave soldering Wave soldering 2009-10-08
WAVE_BG-BD-1 Wave soldering profile Wave soldering 2021-09-08


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No documents available

PCB Symbol, Footprint and 3D Model

Model Name Description

How does it work?

The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.