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| Part Number | W959D8NFYA5I | W959D8NFYA4I | 
|---|---|---|
| Manufacturer | Winbond Electronics | Winbond Electronics | 
| Product Status | Active | Active | 
| Memory Type | Volatile | Volatile | 
| Memory Format | DRAM | DRAM | 
| Technology | HyperRAM | HyperRAM | 
| Memory Size | 512Mb (64M x 8) | 512Mb (64M x 8) | 
| Memory Interface | HyperBus | HyperBus | 
| Clock Frequency | 200 MHz | 250 MHz | 
| Write Cycle Time - Word, Page | 35ns | 35ns | 
| Access Time | 35 ns | 28 ns | 
| Voltage - Supply | 1.7V ~ 2V | 1.7V ~ 2V | 
| Operating Temperature | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TC) | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 24-TBGA | 24-TBGA | 
| Supplier Device Package | 24-TFBGA, DDP (6x8) | 24-TFBGA, DDP (6x8) |