The GS8342D19B is a built in compliance with the Sigma Quad-II+ SRAM pin out standard for Separate I/O synchronous SRAMs. They are 37,748,736-bit (36Mb) SRAMs. The GS8342D19B Sigma Quad SRAMs are just one element in a family of low power, low voltage HSTL I/O SRAMs designed to operate at the speeds needed to implement economical high performance networking systems.Clocking and Addressing Schemes: The GS8342D19B Sigma Quad-II+ SRAMs are synchronous devices. They employ two input register clock inputs, K and K. K and K are independent single-ended clock inputs, not differential inputs to a single differential clock input buffer.Each internal read and write operation in a Sigma Quad-II+ B4 RAM is four times wider than the device I/O bus. An input data bus de-multiplexer is used to accumulate incoming data before it is simultaneously written to the memory array. An output data multiplexer is used to capture the data produced from a single memory array read and then route it to the appropriate output drivers as needed. Therefore the address field of a Sigma Quad-II+ B4 RAM is always two address pins less than the advertised index depth (e.g., the 4M x 8 has a 1M addressable index).
2.0 Clock Latency
Simultaneous Read and Write Sigma Quad™ Interface
JEDEC-standard pinout and package
Dual Double Data Rate interface
Byte Write controls sampled at data-in time
Burst of 4 Read and Write
On-Die Termination (ODT) on Data (D), Byte Write (BW), and Clock (K, K) inputs