Datasheet for Alliance Memory's 512Mb DDR SDRAM with 250/200MHz clock, 2.5V power, and TSOPII/TFBGA packages.
This datasheet describes the Alliance Memory AS4C64M8D1, a 512Mb DDR SDRAM with 250/200MHz clock rates and 2.5V power. It features four internal banks, programmable CAS latency, burst length, and burst type. The device supports auto refresh, self refresh, and power-down modes. Available in 66-pin TSOPII and 60-ball TFBGA packages, it is suitable for high-performance memory and graphics applications.
Pin assignments, block diagrams, and operation modes are detailed, including command truth tables and mode register settings for configuring CAS latency, burst length, and burst type.
| Clock Rate | 250/200MHz |
|---|---|
| Power Supplies | VDD & VDDQ = 2.5V ± 0.2V |
| Operating Temperature | Commercial (0~70 °C) / Industrial (-40~85°C) |
| Interface | SSTL_2 I/O Interface |
| CAS Latency | 2, 2.5, 3 |
| Burst Length | 2, 4, 8 |
| Burst Type | Sequential & Interleaved |
The maximum clock rate is 250/200MHz.
VDD and VDDQ at 2.5V ± 0.2V.
Commercial: 0~70°C, Industrial: -40~85°C.