36 Mbit QDR II+ SRAM at 450 MHz — what it buys you
The Cypress CY7C2245KV18-450BZXI is a 36 Mbit synchronous SRAM built on the QDR II+ architecture, organized as 1M x 36 and clocked at 450 MHz. QDR (Quad Data Rate) means the part transfers four data words per clock cycle — two reads and two writes — which effectively quadruples the data bandwidth compared to a single-data-rate SRAM at the same clock.
450 MHz clock — timing margin in the system budget
At 450 MHz the clock period is roughly 2.22 ns. The QDR II+ interface uses source-synchronous clocking with echo clocks from the SRAM, so the controller must account for flight time, clock skew, and setup/hold windows across the PCB. The 165-FBGA package (13x15 mm) keeps signal path inductance low, but the layout engineer will need controlled-impedance traces matched within a few picoseconds between the data and clock groups.
Industrial temperature range — where it runs
165-FBGA — rework and layout reality
The 165-ball FBGA on a 13x15 mm body is a fine-pitch BGA — expect ball diameters around 0.4 mm with a 0.8 mm pitch. This is reworkable with a good hot-air station and a stencil, but the board needs a via-in-pad or microvia fanout to route the 36 data lines plus address and control signals out of the inner balls.
Lifecycle status — active, no LTB pressure
The base product number CY7C2245 covers the whole density/speed family, so if a future spin needs a different speed grade or package, the pinout stays compatible across the series.