| Manufacturer | Part # | Datasheet | Description |

Microchip Technology
|
MCP7951X |
899Kb/58P |
Battery-Backed SPI Real-Time Clock/Calendar 09/14/21 |

Renesas Technology Corp
|
IDT1338B-31 |
649Kb/24P |
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 112309 |

Integrated Device Techn...
|
IDT1338 |
436Kb/23P |
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM |
| IDT1338 |
321Kb/23P |
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM |

Microchip Technology
|
MCP7940N |
727Kb/58P |
Battery-Backed I2C Real-Time Clock/Calendar with SRAM 09/14/21 |

Renesas Technology Corp
|
1338-18DCGI |
748Kb/24P |
Real-Time Clock with Battery Backed Non-Volatile RAM September 30, 2020 |
| ISL1208 |
1,010Kb/24P |
I2C Real Time Clock/Calendar, Low Power RTC with Battery Backed SRAM |

Microchip Technology
|
MCP79410 |
1Mb/60P |
Battery-Backed I2C??Real-Time Clock/Calendar with EEPROM and Unique ID 11/29/12 2010-2013 |

Renesas Technology Corp
|
ISL1208 |
1Mb/25P |
I2C Real Time Clock/Calendar, Low Power RTC with Battery Backed SRAM Jul 15, 2022 |

Microchip Technology
|
MCP79400 |
920Kb/62P |
Battery-Backed I2C Real-Time Clock/Calendar with SRAM and Protected EEPROM 06/23/16 |

Intersil Corporation
|
ISL12008 |
293Kb/19P |
I2C Real Time Clock with Battery Backup |

STMicroelectronics
|
M41T93 |
787Kb/51P |
Serial SPI bus real-time clock with battery switchover |

Microchip Technology
|
MCP79510-IMS |
946Kb/50P |
3V SPI Real-Time Clock Calendar with Battery Switchover 11/29/11 |

Micro Analog systems
|
MCP7952X |
946Kb/50P |
3V SPI Real-Time Clock Calendar with Battery Switchover |

Toshiba Semiconductor
|
TC8521AP |
863Kb/25P |
REAL TIME CLOCK ? |

Epson ToYoCom
|
RTC-63421 |
413Kb/2P |
Real time clock |
| RTC-65271 |
385Kb/2P |
Real time clock |

List of Unclassifed Man...
|
VT82887 |
81Kb/17P |
Real Time Clock |

Golledge Electronics Lt...
|
RV8564C3 |
128Kb/1P |
Real Time Clock |

Dallas Semiconductor
|
DS1285 |
21Kb/1P |
Real Time Clock |