| PartNumber | RX-4581NB:B0 ROHS | RX-4045SA:AA3:PURE SN | RX-4574LC:B0 PURE SN |
| Description | Real Time Clock SerialInterface22PIN -40C +85C | Real Time Clock SOP 14 Pin 5 +/-5ppm -40C +85C | Real Time Clock Serial Interface -40C +85C |
| Manufacturer | Epson | Epson | Epson |
| Product Category | Real Time Clock | Real Time Clock | Real Time Clock |
| RoHS | E | Y | E |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | SON-22 | SOP-14 | VSOJ-12 |
| RTC Bus Interface | Serial, 4-Wire | Serial, 4-Wire | Serial, 3-Wire |
| Date Format | YY-MM-DD | DW:DM:M:Y | DW:DM:M:Y |
| Time Format | HH:MM:SS | HH:MM:SS | HH:MM:SS |
| RTC Memory Size | 128 B | - | - |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Supply Voltage Min | 1.6 V | 1.7 V | 1.6 V |
| 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 | Alarm, Calendar, Clock, Timer | Alarm, Calendar, Clock, Timer |
| Product | Real Time Clocks | - | Real Time Clocks |
| Series | RX | RX | RX |
| Brand | Epson Timing | Epson Timing | Epson Timing |
| Product Type | Real Time Clock | Real Time Clock | Real Time Clock |
| Factory Pack Quantity | 1000 | 250 | 1000 |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | Clock & Timer ICs |
| Part # Aliases | Q41458191000200 | - | Q414574C2000114 |
| Battery Backup Switching | - | No Backup Switching | - |