Microchip MCP794XX Real-Time Clock/Calendars are stand-alone RTCC s with 64 bytes of SRAM and up to 2 Kbits of EEPROM, including a user-lockable section of EEPROM that can be factory-programmed with a MAC address. Features include digital trimming, power-fail time stamp, and battery-switchover. MCP794XX RTCCs are ideally suited for smart energy, home appliance, automotive, and consumer electronic applications.

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• Real-Time Clock/Calendar (RTCC), Battery Backed:
• Hours, Minutes, Seconds, Day of Week, Day, Month and Year
• Dual alarm with single output
• On-Chip Digital Trimming/Calibration:
• Range -127 to +127 ppm
• Resolution 1 ppm
• Programmable Open-Drain Output Control:
• CLKOUT with 4 selectable frequencies
• Alarm output
• 64 Bytes SRAM, Battery Backed.
• 1 Kbits EEPROM (128x8):
• 8 bytes/page
• Block/sector write protection
• Protect none, 1/4, 1/2 or all of array
• Separate 64-Bit Unique ID:
• 8 bytes/page
• Block/sector write protection
• Protect none, 1/4, 1/2 or all of array
• Separate 64-Bit Unique ID:
• User or factory programmable
• Protected area
• EUI-48™ or EUI-64™ MAC address
• Custom ID programming
• Automatic VCC Switchover to VBAT Backup Supply
• Power-Fail Time-Stamp for Battery Switchover
• Low-Power CMOS Technology:
• Dynamic Current: 400 µA max read
• Dynamic Current: 3mA max EEPROM write
• Battery Backup Current: <700nA @ 1.8V
  
• 100 kHz and 400 kHz Compatibility
• ESD Protection >4,000V
• More than 1 Million Erase/Write Cycles
• Packages include 8-Lead SOIC, TSSOP, 2x3 TDFN, MSOP
• Pb-Free and RoHS Compliant
• Temperature Ranges:
• Industrial (I): -40°C to +85°C
  

Microchip 's MCP7940N Real-Time Clock/Calendar features 64 Bytes SRAM, digital timing compensation, programmable output control, and a power sense circuit for battery switch-over. The MCP7940N RTCC tracks time with an economical 32.768 kHz crystal and communicates via I²C ™ bus. Four selectable frequencies are available using the programmable CLKOUT. The MCP7940N Real-Time Clock/Calendar from Microchip operates in either 24-hour or 12-hour format with settable alarms to the second, minute, hour, day of the week, date, or month.

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• Real-Time Clock/Calendar (RTCC), Battery Backed:
• Hours, Minutes, Seconds, Day of Week, Day, Month and Year
• Dual alarm with single output
  
• On-Chip Digital Trimming/Calibration:
• Range -127 to +127 ppm
• Resolution 1 ppm
• Programmable Open-Drain Output Control:
• CLKOUT with 4 selectable frequencies
• Alarm output
• 64 Bytes SRAM, Battery Backed
• Automatic VCC Switchover to VBAT Backup Supply
• Power-Fail Time-Stamp for Battery Switchover
• Low-Power CMOS Technology:
• Dynamic Current: 400 µA max read
• Battery Backup Current: <700nA @ 1.8V
• 100 kHz and 400 kHz Compatibility
• ESD Protection >4,000V
• Packages include 8-Lead SOIC, TSSOP, 2x3 TDFN, MSOP
• Pb-Free and RoHS Compliant
• Temperature Ranges:
• Industrial (I): -40°C to +85°C