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| Part Number | CY7C4231-15AXC | CY7C4235-15AXC | CY7C4251-15AXC | CY7C4231-15JXC | CY7C421-15AXC | CY7C4211-15AXC | CY7C4221-15AXC | 
|---|---|---|---|---|---|---|---|
| Manufacturer | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | 
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | 
| Memory Size | 18K (2K x 9) | 36K (2K x 18) | 72K (8K x 9) | 18K (2K x 9) | 4.5K (512 x 9) | 4.5K (512 x 9) | 9K (1K x 9) | 
| Function | Synchronous | Synchronous | Synchronous | Synchronous | Asynchronous | Synchronous | Synchronous | 
| Data Rate | 66.7MHz | 66.7MHz | 66.7MHz | 66.7MHz | 50MHz | 66.7MHz | 66.7MHz | 
| Access Time | 10ns | 10ns | 10ns | 10ns | 15ns | 10ns | 10ns | 
| Voltage - Supply | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V | 
| Current - Supply (Max) | 35mA | 45mA | 35mA | 35mA | 65mA | 35mA | 35mA | 
| Bus Directional | Uni-Directional | Uni-Directional | Uni-Directional | Uni-Directional | Uni-Directional | Uni-Directional | Uni-Directional | 
| Expansion Type | Depth, Width | Depth, Width | Depth, Width | Depth, Width | Depth, Width | Depth, Width | Depth, Width | 
| Programmable Flags Support | Yes | Yes | Yes | Yes | No | Yes | Yes | 
| Retransmit Capability | No | Yes | No | No | Yes | No | No | 
| FWFT Support | No | No | No | No | No | No | No | 
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 32-TQFP | 64-LQFP | 32-TQFP | 32-LCC (J-Lead) | 32-TQFP | 32-TQFP | 32-TQFP | 
| Supplier Device Package | 32-TQFP (7x7) | 64-TQFP (14x14) | 32-TQFP (7x7) | 32-PLCC (11.43x13.97) | 32-TQFP (7x7) | 32-TQFP (7x7) | 32-TQFP (7x7) |