Clock distribution workhorse in a PLCC-32
The CY7B992-5JC from Cypress is a clock buffer/driver that takes one input and fans it out to eight outputs — an 8:8 ratio — with a maximum operating frequency of 80 MHz. This is the part you reach for when a single clock source needs to drive multiple loads without signal degradation, common in telecom line cards, industrial controllers, and legacy backplane timing trees. The 32-PLCC package with J-leads (11.43 x 13.97 mm body) is a through-hole-compatible surface-mount footprint that still sees heavy use in socketed or rework-friendly designs.
80 MHz fanout — what it means for the clock tree
The 8:8 ratio means the part buffers eight input signals to eight outputs each, or can be configured as a 1:8 fanout buffer depending on the application. At 80 MHz, the propagation delay and skew between outputs are tight enough to keep a multi-drop clock bus within timing budget for most 33 MHz PCI, 50 MHz Ethernet MAC, or 66 MHz memory controller interfaces. The PLCC-32 package's J-leads offer a lower profile than DIP but still allow socket mounting for field serviceability — a consideration in telecom central-office gear where uptime drives the board architecture.
Active, but watch the RoHS flag
The catch is RoHS non-compliance — this part uses lead-bearing solder or plating, which means it cannot be used in designs requiring RoHS exemption-free assembly. For legacy builds that already have a leaded process qualified, this is not a blocker; for new designs targeting EU or California RoHS compliance, you will need to source a tin-lead compatible alternative or qualify a RoHS-compliant variant (if one exists in the family).
Sourcing and supply reality
The PLCC-32 package is still widely manufactured, so lead times tend to track the industry average for mature logic parts — typically 8 to 14 weeks from factory order, with spot availability through independent distributors for smaller quantities. The RoHS non-compliance narrows the buyer pool, which can actually improve availability for those who can accept leaded devices. Pricing is quoted per order; volume breaks are available above reel quantities.