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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  CY14B256I | 256-Kbit (32 K x 8) Serial (I2C) nvSRAM with Real Time Clock Full-featured RTC | Cypress Semiconductor | CYPRESS | - | - | - | 2.02 Mb |
| 2. | CY14B256I-SFXI | 256-Kbit (32 K x 8) Serial (I2C) nvSRAM with Real Time Clock Full-featured RTC | Cypress Semiconductor | CYPRESS | - | - | - | 2.02 Mb |
| 3. | CY14B256I-SFXI | 256-Kbit (32 K ‡ 8) Serial (I2C) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 1.75 Mb |
| 4. | CY14B256I-SFXIT | 256-Kbit (32 K ‡ 8) Serial (I2C) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 1.75 Mb |
| 5. | CY14B256I-SFXIT | 256-Kbit (32 K x 8) Serial (I2C) nvSRAM with Real Time Clock Full-featured RTC | Cypress Semiconductor | CYPRESS | - | - | - | 2.02 Mb |
| 6. | CY14B256K | 256-Kbit (32K x 8) nvSRAM with Real-Time-Clock | Cypress Semiconductor | CYPRESS | - | - | - | 1.15 Mb |
| 7. | CY14B256K-SP25XC | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 8. | CY14B256K-SP25XCT | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 9. | CY14B256K-SP25XCT | 256-Kbit (32K x 8) nvSRAM with Real-Time-Clock | Cypress Semiconductor | CYPRESS | - | - | - | 1.15 Mb |
| 10. | CY14B256K-SP25XI | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 11. | CY14B256K-SP25XIT | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 12. | CY14B256K-SP35XC | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 13. | CY14B256K-SP35XCT | 256-Kbit (32K x 8) nvSRAM with Real-Time-Clock | Cypress Semiconductor | CYPRESS | - | - | - | 1.15 Mb |
| 14. | CY14B256K-SP35XCT | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 15. | CY14B256K-SP35XI | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 16. | CY14B256K-SP35XIT | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 17. | CY14B256K-SP45XC | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 18. | CY14B256K-SP45XCT | 256-Kbit (32K x 8) nvSRAM with Real-Time-Clock | Cypress Semiconductor | CYPRESS | - | - | - | 1.15 Mb |
| 19. | CY14B256K-SP45XCT | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
| 20. | CY14B256K-SP45XI | 256 Kbit (32K x 8) nvSRAM with Real Time Clock | Cypress Semiconductor | CYPRESS | - | - | - | 601 Kb |
