Description The HB54A2569F1U, HB54A5129F2U are Double Data Rate (DDR) SDRAM Module, mounted 256M bits DDR SDRAM (HM5425801BTT) sealed in TSOP package, and 1 piece of serial EEPROM (2k bits EEPROM) for Presence Detect (PD). Features • 184-pin socket type package (dual lead out) - Outline: 133.35mm (Length) × 30.48mm (Height) × 4.00mm (Thickness) - Lead pitch: 1.27mm • 2.5V power supply (VCC/VCCQ) • SSTL-2 interface for all inputs and outputs • Clock frequency: 143MHz/133MHz/125MHz (max.) • 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): 3, 3.5 • 8192 refresh cycles: 7.8µs (8192/64ms) • 2 variations of refresh - Auto refresh - Self refresh
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