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Description

The HB54A2568KN is Double Data Rate (DDR) SDRAM Module, mounted 256M bits DDR SDRAM (HM5425161BTT) sealed in TSOP package, and 1 piece of serial EEPROM (2k bits EEPROM) for Presence Detect (PD). The HB54A2568KN is organized as 16M × 64 × 2 bank mounted 8 pieces of 256M bits DDR SDRAM.

Features

? 200-pin socket type package (dual lead out)

- Outline: 67.6mm (Length) × 31.75mm (Height) × 3.80mm (Thickness)

- Lead pitch: 0.6mm

? 2.5V power supply (VCC)

? SSTL-2 interface for all inputs and outputs

? Clock frequency: 133 MHz (max) (-A75B/B75B) : 100 MHz (max) (-10B)

? Data inputs, outputs and DM are synchronized with DQS

? 4 banks can operate simultaneously and independently (Component)

? Burst read/write operation

? Programmable burst length: 2, 4, 8

- Burst read stop capability

? Programmable burst sequence

- Sequential

- Interleave

? Start addressing capability

- Even and Odd

? Programmable /CAS latency (CL): 2, 2.5

? 8192 refresh cycles: 7.8μs (8192row /64ms)

? 2 variations of refresh

- Auto refresh

- Self refresh