What this dual-port SRAM does in a system
The Infineon CY7C019V-20AXC is a 1.152 Mbit dual-port asynchronous SRAM organized as 128K x 9 bits. It gives two independent bus masters simultaneous read/write access to the same memory array through separate left and right ports, each with its own address, data, and control lines. The 20 ns access time means a read or write completes within 20 ns of the address being stable, which keeps bus timing closure manageable in systems running at moderate clock rates. Typical applications include shared memory in multi-processor systems, FIFO buffers in networking equipment, and mailbox registers in telecom line cards where two controllers need to exchange data without contention logic.
A 20 ns access time means the SRAM can support bus cycles down to 20 ns, which translates to a 50 MHz read/write rate in a single-cycle handshake. For a dual-port part, that access time applies independently on each port, so both sides can run at that speed simultaneously. This matters when the part is used as a shared buffer between a fast DSP and a slower host controller — the faster port can burst without stalling.
Supply and temperature — where it fits
The part comes in a 100-pin TQFP with a 14 mm x 14 mm body, surface-mount only. The TQFP is a fine-pitch (0.5 mm) quad flat pack that needs careful solder-paste stencil design and X-ray inspection after reflow to catch bridging. No exposed thermal pad — all heat dissipates through the leads, so forced airflow may be needed if the ambient is near the upper limit and both ports are running continuously.
Lifecycle status — obsolete, plan the bridge
The CY7C019V-20AXC is marked obsolete by Infineon (formerly Cypress). That means no further factory orders are accepted, and the last-time-buy window has closed. Any new design should avoid this part; existing production runs should secure a bridge supply while qualifying a replacement.