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| PartNumber | FM33256B-G | FM33256-G | FM33256-GTR |
| Description | Real Time Clock 256Kb F-RAM Processor Companion | F-RAM 256K w/Pwr Mon WDT Bat Sw Pwr Fail | F-RAM 256K w/Pwr Mon WDT Bat Sw Pwr Fail |
| Manufacturer | Cypress Semiconductor | RAMTRON | RAMTRON |
| Product Category | Real Time Clock | IC Chips | IC Chips |
| RoHS | Y | - | - |
| Mounting Style | SMD/SMT | - | - |
| Package / Case | SOIC-14 | - | - |
| RTC Bus Interface | Serial, SPI | - | - |
| Date Format | MM-DD | - | - |
| Time Format | HH:MM:SS | - | - |
| Battery Backup Switching | Backup Switching | - | - |
| RTC Memory Size | 256 kB | - | - |
| Supply Voltage Max | 3.6 V | - | - |
| Supply Voltage Min | 2.7 V | - | - |
| Minimum Operating Temperature | - 40 C | - | - |
| Maximum Operating Temperature | + 85 C | - | - |
| Packaging | Tube | - | - |
| Function | Alarm, Calendar, Clock, Unique ID, Watchdog | - | - |
| Product | Real Time Clocks | - | - |
| Series | FM33256B-G | - | - |
| Brand | Cypress Semiconductor | - | - |
| Moisture Sensitive | Yes | - | - |
| Product Type | Real Time Clock | - | - |
| Factory Pack Quantity | 112 | - | - |
| Subcategory | Clock & Timer ICs | - | - |
| Unit Weight | 0.011923 oz | - | - |