GENERAL DESCRIPTION

The MU9C4485A/L, MU9C2485A/L, and MU9C1485A/L WidePort LANCAMs are 64-bit wide content-addressable memories (CAMs), featuring a 32-bit wide interface. This interface doubles the available I/O bandwidth in many applications while maintaining the same powerful enhanced architecture and instruction set as the MU9C2480A/L.

DISTINCTIVE CHARACTERISTICS

? 4096 (4485A/L), 2048 (2485A/L), and 1024 (1485A/L) word CMOS content-addressable memories (CAMs)

? 64-bit word width

? 32-bit I/O compatible with the MU9C1485

? Fast 50 ns compare speed

? Dual configuration register set for rapid context switching

? Increased flexibility of MUSIC’s patented CAM/RAM partitioning

? 80-pin TQFP package with the same pinout as the MU9C1485 and MU9C1965A/L

? 5 volt (A) or 3.3 volt (L) operation

APPLICATION BENEFITS

Enhances Ethernet and Token-Ring LAN bridges and switches:

? 64-bit width stores 48-bit MAC address plus associated data (Port ID, time stamp, “permanent” flag)

? 32-bit I/O supports multiple ports of fast (100 Mb) Ethernet or Gigabit Ethernet

? Station list depth flexibility with choice of pin-compatible device densities and glue-free cascading

? 3.3 Volt option for low power systems

? Industrial temperature grades for harsh environments