DESCRIPTION
The M66220 is a mail box that incorporates a complete CMOS shared memory cell of 256 × 8-bit configuration using high-performance silicon gate CMOS process technology, and is equipped with two access ports of A and B.
Access ports A and B are equipped with independent addresses CS, WE and OE control pins and I/O pins to allow independent and asynchronous read/write operations from/to shared memory individually. This product also incorporates a port adjustment arbitration function in address contention from both ports.

FEATURES
• Memory configuration of 256 × 8 bits
• High-speed access, address access time 40ns (typ.)
• Complete asynchronous accessibility from ports A and B
• Completely static operation
• Built-in port arbitration function
• Low power dissipation CMOS design
• 5V single power supply
• Not Ready output pin is provided (open drain output)
• TTL direct-coupled I/O
• 3-state output for I/O pins

APPLICATION
   Inter-MPU data transfer memory, buffer memory for image processing system.