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| PartNumber | IS61DDB21M18C-250M3L | IS61DDB21M18A-300M3L | IS61DDB21M18A-300B4L |
| Description | SRAM 18Mb 250Mhz 1Mx18 DDR-II Sync SRAM | SRAM 18Mb 300Mhz 1Mx18 DDR-II Sync SRAM | SRAM 18Mb, 1M x 18 DDR-II Sync SRAM |
| Manufacturer | ISSI | ISSI | ISSI |
| Product Category | SRAM | SRAM | SRAM |
| RoHS | Y | Y | Y |
| Series | IS61DDB21M18C | IS61DDB21M18A | IS61DDB21M18A |
| Brand | ISSI | ISSI | ISSI |
| Moisture Sensitive | Yes | Yes | Yes |
| Product Type | SRAM | SRAM | SRAM |
| Factory Pack Quantity | 105 | 105 | 144 |
| Subcategory | Memory & Data Storage | Memory & Data Storage | Memory & Data Storage |
| Memory Size | - | 18 Mbit | 18 Mbit |
| Organization | - | 1 M x 18 | 1 M x 18 |
| Maximum Clock Frequency | - | 300 MHz | 300 MHz |
| Interface Type | - | Parallel | Parallel |
| Supply Voltage Max | - | 1.9 V | 1.89 V |
| Supply Voltage Min | - | 1.7 V | 1.71 V |
| Supply Current Max | - | 600 mA | 580 mA |
| Minimum Operating Temperature | - | 0 C | 0 C |
| Maximum Operating Temperature | - | + 70 C | + 70 C |
| Mounting Style | - | SMD/SMT | SMD/SMT |
| Package / Case | - | FBGA-165 | FBGA-165 |
| Packaging | - | Tray | Tray |
| Memory Type | - | DDR-II | DDR |
| Access Time | - | - | 0.45 ns |
| Type | - | - | Synchronous |