What this 1Mbit asynchronous SRAM does in a design
As an asynchronous part, it requires no clock — the read and write cycles are triggered by address transitions and control strobes, which simplifies the memory controller design but limits burst throughput compared to synchronous SRAMs. This part is suited for applications that need fast, random-access scratchpad memory without the complexity of a clocked interface: networking equipment, industrial controllers, test instrumentation, and embedded systems where the bus master can tolerate single-cycle handshakes.
10 ns access time — timing budget for the bus
On a 100 MHz bus (10 ns period), this SRAM leaves essentially zero margin for address-to-data setup before the next clock edge — the bus controller must insert at least one wait state or use a slower clock domain. For a 50 MHz bus (20 ns period), the 10 ns access gives a comfortable 10 ns of setup margin before the next rising edge, allowing zero-wait-state reads if the controller's address-to-output delay is accounted for. When sizing the memory subsystem, factor in the controller's own propagation delays and the PCB trace flight time; a 10 ns part on a 66 MHz bus (15 ns period) typically needs one wait state.
For new designs, a pin-compatible alternative should be qualified.
Package and footprint — 32-TSOP II wide body
The package ships in Tray form. For rework, the wide SOIC-like body is compatible with standard hot-air profiles;.