18 Mbit QDR II+ SRAM at 550 MHz
The QDR II+ interface eliminates bus-turnaround dead cycles between read and write operations, delivering full back-to-back throughput for high-bandwidth data paths in networking line cards, telecom switches, and high-end test equipment. The 1.7 V to 1.9 V supply rail and commercial temperature range (0°C to 70°C) target indoor, temperature-controlled environments where tight timing margin at 550 MHz demands a clean supply.
At 550 MHz, every nanosecond of skew or supply noise eats into the data-valid window. The QDR II+ architecture helps by separating read and write data ports, so the bus never idles during direction changes. Plan for dedicated decoupling per the layout guidelines — this is not a part you drop onto a shared rail.
Supplied in a 165-ball FBGA (13 x 15 mm) on tray. The ball pitch requires a controlled-impedance PCB stackup and via-in-pad if routing all data bits plus address and control at 550 MHz.