13-element, 26-bit non-inverting buffer for SSTL-2 memory buses
The Cypress CY2SSTV16859ZC is a 13-element, 26-bit non-inverting buffer designed for DDR SDRAM memory bus termination and clock distribution. Each of the 13 elements handles 26 bits, giving a total of 338 bits of buffered signal path. The part operates from a 2.3V to 2.7V supply, matching the SSTL-2 (Stub Series Terminated Logic for 2.5V) standard used in DDR1 memory interfaces. Output drive is symmetric at 16mA high and low, sufficient for driving multiple DIMM loads on a heavily loaded memory bus.
Fine-pitch TSSOP — rework and layout notes
Housed in a 64-TFSOP (0.240", 6.10mm width) package, also specified as a 64-TSSOP supplier device package, this is a fine-pitch surface-mount part with 0.5mm lead pitch. The narrow body and dense pin count demand careful solder-paste stencil design and a reflow profile that avoids tombstoning. Under a hot-air station, the part lifts cleanly if you preheat the board to 100°C and work the leads from the long sides — the thermal mass is low, so it reflows fast. The package is MSL 3 per standard Cypress TSSOP handling — bake before reflow if the moisture-barrier bag has been open past the floor-life window.
It is not specified for industrial or automotive temperature extremes. If your application sees below-freezing startup or sustained heat above 85°C, look for an industrial-temperature variant in the same family.
RoHS non-compliant — legacy solder finish
The CY2SSTV16859ZC is listed as RoHS non-compliant, meaning the device uses a lead-bearing solder finish (likely SnPb). If your assembly line is RoHS-only, you will need to qualify a lead-free alternative or apply for an exemption.