Programmable Clock Generator


Montage Technology has launched a series of programmable clock generator chips capable of producing any output frequency between 1MHz and 333.33MHz. Leveraging Montage's advanced I/O technology, this series offers excellent jitter performance and provide a wide range of clock frequencies for low phase noise spread-spectrum applications. These chips provide 1, 2 or 4 pairs of differential clock outputs with independently configurable output characteristics. All differential clock outputs are compliant with PCIe Gen1/2/3/4/5/6 common clock and separate clock architecture specifications, meeting the high-performance requirements of existing and next-generation of PCIe devices.

With their independently configurable clock outputs and ultra-low phase jitter performance, the devices can satisfy the demanding input reference clock needs of high-performance applications, including PCIe Gen5/6, 100G Ethernet, USB3.x, WiFi6 and more.

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Montage Programmable Clock Generators

Typical Application Scenarios

CKG application 1
CKG application 2
CKG application 3
CKG application 4


  • 1/2/4 independently configurable clock outputs
    • Output frequency: any frequency between 1MHz and 333.33MHz
    • Output voltage: 1.8V/2.5V/3.3V, independent from Core voltage
    • Output I/O type: LP-HCSL, HCSL, LVDS, LVCMOS
    • I/O drive capability: output impedance, amplitude and enabling
  • 2 spread spectrum modes (independently configurable)
    • Spread spectrum mode: down, center
    • Spread spectrum accuracy: 0.01%
  • 3 PCIe reference clock architectures: CC, SRIS, SRnS
  • 3 types of input reference clocks
    • Integrated/External crystal: 8MHz to 50MHz 
    • External clock source: 1.2MHz to 250MHz
  • 3 control modes:
    • I²C Mode: support maximum 1Mb/s data rate, burst read/write mode
    • OTP Mode: support dynamic switch of 4 on-chip OTP configurations
    • PIN Mode: support dynamic switch of 9 SSC settings
  • Low power consumption
    • 2-output devices: ~ 100mW
    • 4-output devices: ~ 150mW
  • Working range: 1.8V to 3.3V,-40℃ to +85℃
  • Moisture sensitivity levels
    • LGA package: MSL-3
    • VFQFPN package: MSL-1

Product List

Part No.Input Clock SourceOutput ClockPackage
M88TG0104AExternal crystal or reference clock4x differential clock outputs,  
2x LVCMOS reference clock outputs
4mm × 4mm × 0.75mm,    
24-pin VFQFPN  
M88TG0104BIntegrated 50MHz crystal4x differential clock outputs,   
2x LVCMOS reference clock outputs
4mm × 4mm × 1.10mm,    
24-pin LGA  
M88TG0102AExternal crystal or reference clock2x differential clock outputs,   
1x LVCMOS reference clock outputs
3mm × 3mm × 1.10mm,    
16-pin LGA  
M88TG0102BIntegrated 50MHz crystal2x differential clock outputs, 
1x LVCMOS reference clock output
3mm × 3mm × 1.10mm,    
16-pin LGA  
M88TG0101AExternal crystal or reference clock1x differential clock output, 
1x LVCMOS reference clock output
2.5mm × 2.5mm × 1.10mm,    
12-pin LGA  
M88TG0101BIntegrated 50MHz crystal1x differential clock output,  
1x LVCMOS reference clock output
2.5mm × 2.5mm × 1.10mm,    
12-pin LGA