HY5DU56822ALT

• V_DD, V_DDQ = 2.5V +/- 0.2V
• All inputs and outputs are compatible with SSTL_2 interface
• Fully differential clock inputs (CK, /CK) operation
• Double data rate interface
• Source synchronous - data transaction aligned to bidirectional data strobe (DQS)
• x16 device has two bytewide data strobes (UDQS,LDQS) per each x8 I/O
• Data outputs on DQS edges when read (edged DQ)Data inputs on DQS centers when write (centered DQ)
• On chip DLL align DQ and DQS transition with CKtransition
• DM mask write data-in at the both rising and falling edges of the data strobe
• All addresses and control inputs except data, data strobes and data masks latched on the rising edges of the clock
• Programmable CAS latency 1.5, 2, 2.5 and 3 supported
• Programmable burst length 2 / 4 / 8 with both sequential and interleave mode
• Internal four bank operations with single pulsed /RAS
• tRAS Lock-out function supported
• Auto refresh and Self refresh supported
• 8192 refresh cycles / 64ms
• JEDEC standard 400mil 66pin TSOP-II with 0.65mm pin pitch
• Full and Half strength driver option controlled by EMRS

The Hynix HY5DU56422, HY5DU56822ALT and HY5DU561622 are a 268,435,456-bit CMOS Double Data Rate(DDR) Synchronous DRAM, ideally suited for the main memory applications which requires large memory density and high bandwidth. The Hynix 256Mb DDR SDRAMs offer fully synchronous operations referenced to both rising and falling edges of the clock. While all addresses and control inputs are latched on the rising edges of the CK (falling edges of the /CK), Data,Data strobes and Write data masks inputs are sampled on both rising and falling edges of it.

The data paths are internally pipelined and 2-bit prefetched to achieve very high bandwidth. All input and output voltage levels are compatible with SSTL_2.