10 Differential Output, Ultra-Low-Jitter, Fanout Clock Buffer

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The SiT92211 is a 10-output, low-jitter fanout clock buffer that supports frequencies up to 2.1 GHz. It is ideal for low-jitter, high-frequency clock/data distribution and level translation applications.

The buffer can use a clock input from primary or secondary clock sources, either single ended or fully differential. The selected clock can be distributed to two output drive banks A, B and one LVCMOS output.

The output drivers of each bank can be independently programmed to LVPECL, LVDS, HCSL or HIZ mode. The LVCMOS clock output is synchronized to selected clock and can be enabled or disabled in a glitch free manner.

The SiT92211 operates from a 3.3 V/2.5 V core supply and 3 independent 3.3 V/2.5 V output supplies. The LVCMOS output driver can operate at 1.8 V.


7x7 mm, 48-pin QFN Clock Buffer package
"Specs" "Value"
Operating Temperature Range (°C) -40 to 85
Package Type (mm²) 7x7 mm, 48-pin QFN
Buffer Type Fanout
Number of Inputs 1
Number of Outputs 10 Differential
Input Type LVPECL, LVDS, LVCMOS, SSTL, HCSL
Input Frequency Range 0 Hz to 2.1 GHz
Output Type LVPECL, LVDS, HCSL, LVCMOS
Output Frequency Range 0 Hz to 2.1 GHz
Additive Phase Jitter (rms) 55 fs
Propagation Delay, Typical 1.4 ns
Output-Output Skew, Typical 30 ps
Availability Production
  • 3:1 input clock selection.
  • Two universal clock inputs can operate up to 2.1 GHz and accept LVPECL, LVDS, LVCMOS, CML(ac-coupled only), HCSL, SSTL or single ended clocks.
  • Two output driver banks A and B which can be programmed independently to LVPECL, LVDS, HCSL or HIZ mode.
  • Level translation with core supply voltage of 3.3 V/2.5 V and 3.3 V/2.5 V output supply for differential output drivers.
  • 3.3 V/2.5 V/1.8 V operation for the single LVCMOS output driver.
  • High PSRR -70/-73 dBc for LVPECL/LVDS modes.
  • Supports PCI-e Gen 1 to Gen 5.
SiT92211 Functional Overview
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