| PartNumber | R2051S01-E2-F | R2051L02-E2 | R2051L01-E2 |
| Description | Real Time Clock 2-Wire Real Time Clock IC | Real Time Clock 2-Wire Real Time Clock IC | Real Time Clock 2-Wire Real Time Clock IC |
| Manufacturer | Ricoh Electronics | Ricoh Electronics | Ricoh Electronics |
| Product Category | Real Time Clock | Real Time Clock | Real Time Clock |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | SSOP-16 | QFN023023-16 | QFN023023-16 |
| RTC Bus Interface | Serial, 2-Wire, I2C | Serial, 2-Wire, I2C | Serial, 2-Wire, I2C |
| Date Format | BCD format | BCD format | BCD format |
| Time Format | BCD format | BCD format | BCD format |
| Battery Backup Switching | Backup Switching | Backup Switching | Backup Switching |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Supply Voltage Min | 750 mV | 750 mV | 750 mV |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Reel | Reel | Reel |
| Function | Alarm, Calendar, Clock, Timer Interrupt | Alarm, Calendar, Clock, Timer Interrupt | Alarm, Calendar, Clock, Timer Interrupt |
| Product | Real Time Clocks | Real Time Clocks | Real Time Clocks |
| Series | R2051S | R2051L | R2051L |
| Type | CMOS Real-Time Clock and Calendar | CMOS Real-Time Clock and Calendar | CMOS Real-Time Clock and Calendar |
| Brand | Ricoh Electronic Devices Company | Ricoh Electronic Devices Company | Ricoh Electronic Devices Company |
| Product Type | Real Time Clock | Real Time Clock | Real Time Clock |
| Factory Pack Quantity | 2000 | 3000 | 3000 |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | Clock & Timer ICs |