PLL-based clock distribution for 200 MHz trees
The Cypress CY7B9940V-2AC is a PLL-based clock buffer from the RoboClockII Junior family. It accepts LVPECL or LVTTL inputs and delivers LVTTL outputs across a 4:10 input-to-output ratio, with a maximum operating frequency of 200 MHz.
4:10 fanout — what it means for the clock tree
The 4:10 ratio means this buffer can accept up to four independent clock inputs and distribute them to ten outputs. In practice, that lets a designer fan out a single master clock to multiple destination ICs (FPGAs, PHYs, ASICs) while keeping skew low across the bank. The differential input (LVPECL) option is useful when the reference clock arrives over a twisted pair or a long board trace; the single-ended LVTTL input works for local on-board oscillators. All ten outputs are LVTTL, so the downstream logic must accept that logic level — no CML or HCSL on the output side.
Supply and temperature — deployment context
The supply range is 2.97 V to 3.63 V. The operating temperature range is 0°C to 70°C.
Lifecycle and sourcing reality
Note that this part is marked RoHS non-compliant, so it is not suitable for new designs requiring RoHS exemption-free assembly. For RoHS-compliant builds, a lead-free variant or a different buffer should be selected.