PLL with band gap controlled VCO

The 74HCT9046A. This device features reduced input threshold levels to allow interfacing to TTL logic levels. Inputs also include clamp diodes, this enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features and benefits

  • Operation power supply voltage range from 4.5 V to 5.5 V
  • Low power consumption
  • Complies with JEDEC standard no. 7A
  • Inhibit control for ON/OFF keying and for low standby power consumption
  • center frequency up to 17 MHz (typical) at VCC = 5.5 V
  • Choice of two phase comparators:
    • PC2: Edge-triggered JK flip-flop
  • No dead zone of PC2
  • Charge pump output on PC2, whose current is set by an external resistor Rbias
  • center frequency tolerance ±10 %
  • Excellent Voltage Controlled Oscillator (VCO) linearity
  • Low frequency drift with supply voltage and temperature variations
  • On-chip band gap reference
  • Glitch free operation of VCO, even at very low frequencies
  • Zero voltage offset due to operational amplifier buffering
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V


  • FM modulation and demodulation where a small center frequency tolerance is essential
  • Frequency synthesis and multiplication where a low jitter is required (e.g. video picture-in-picture)
  • Frequency discrimination
  • Tone decoding
  • Data synchronization and conditioning
  • Voltage-to-frequency conversion
  • Motor-speed control


Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)fmax (MHz)Power dissipation considerationsRth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HCT9046ADProduction4.5 - 5.5TTL± 42319low671.025.1SO16


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Bulk PackActive74HCT9046AD74HCT9046AD,112
( 9350 441 80112 )
Reel 13" Q1/T1Active74HCT9046AD74HCT9046AD,118
( 9350 441 80118 )

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
74HCT9046AD74HCT9046AD,11274HCT9046ADweek 30, 200484.96.621.51E811
74HCT9046AD74HCT9046AD,11874HCT9046ADweek 30, 200484.96.621.51E811
Quality and reliability disclaimer

Documentation (7)

File nameTitleTypeDate
74HCT9046APLL with band gap controlled VCOData sheet2020-03-20
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
Nexperia_Selection_guide_2020Nexperia Selection Guide 2020Selection guide2020-01-31
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm bodyPackage information2020-04-21


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