The HM5225165B is a 256-Mbit SDRAM organized as 4194304-word x 16-bit x 4 bank. The HM5225805B is a 256-Mbit SDRAM organized as 8388608-word x 8-bit x 4 bank. The HM5225405B is a 256-Mbit SDRAM organized as 16777216-word x 4-bit x 4 bank. All inputs and outputs are referred to the rising edge of the clock input. It is packaged in standard 54-pin plastic TSOP II.