W9464G6IH is a CMOS Double Data Rate synchronous dynamic random access memory (DDR SDRAM); organized as 1M words × 4 banks × 16 bits. W9464G6IH delivers a data bandwidth of up to 500M words per second.Such a chip is used in the hard disk WD1600AAJS

• 2.5V ±0.2V Power Supply for DDR 333/400
• 2.6V ±0.1V Power Supply for DDR500
• Up to 250 MHz Clock Frequency
• Double Data Rate architecture; two data transfers per clock cycle
• Differential clock inputs (CLK and CLK )
• DQS is edge-aligned with data for Read; center-aligned with data for Write
• CAS Latency: 2, 2.5, 3 and 4
• Burst Length: 2, 4 and 8
• Auto Refresh and Self Refresh
• Precharged Power Down and Active Power Down
• Write Data Mask
• Write Latency = 1
• 15.6μS Refresh interval (4K/64 mS Refresh)
• Maximum burst refresh cycle: 8
• Interface: SSTL_2
• Packaged in TSOP II 66-pin, using Lead free materials with RoHS compliant