MCP795B20-I/SL

Real Time Clock Overview

The MCP795B20-I/SL is a low-power Real-Time Clock/Calendar (RTCC) manufactured by Microchip Technology, housed in a 14-lead SOIC package. It features an SPI interface with clock speeds up to 10 MHz and operates within a voltage range of 1.8V to 5.5V on VCC and 1.3V to 5.5V on VBAT. The device includes 64 bytes of battery-backed SRAM and 2 Kbits of EEPROM. Key specifications include a programmable watchdog timer, dual event detect inputs, and a 32 kHz boot-up clock output at power-on.

Real Time Clock Feature Summary

• Integrated 32 kHz Boot-up Clock Output at Power-Up
• 2 Kbit EEPROM with Software Block Write-Protect and 1M Endurance Cycles
• Dual Programmable Alarms with IRQ or WDO Support
• Programmable Watchdog Timer with Dedicated Output Pin

Real Time Clock Applications

• Systems requiring millisecond-level alarm precision via SPI
• Applications needing automatic time logging during power failures
• Devices utilizing external digital events for interrupt generation

Real Time Clock Procurement Notes

Verify the specific suffix 'I/SL' against the manufacturer's current datasheet to confirm the industrial temperature range (-40°C to +85°C) and SOIC-14 package configuration. Ensure that the blank Unique ID requirement matches the system's security needs, as this variant does not include preprogrammed MAC addresses.

Real Time Clock Selection Notes

Select the MCP795B20-I/SL when a 32 kHz clock signal is required immediately upon power-up without waiting for oscillator stabilization. Choose this part over the MCP795W20 series if the boot-time clock feature is necessary. Confirm that the 2 Kbit EEPROM capacity meets data storage requirements compared to the 1 Kbit variants.

Real Time Clock Part Context

This component belongs to the MCP795WXX/MCP795BXX family of SPI Real-Time Clocks. The 'B' designation indicates the inclusion of the 32 kHz boot-up clock feature, while the '20' suffix specifies 2 Kbit EEPROM and a blank Unique ID area. The 'I' denotes the industrial temperature grade, and 'SL' identifies the SOIC-14 package type.

Real Time Clock Replacement Considerations

The MCP795W20-I/SL serves as a functional substitute if the 32 kHz boot-up clock feature is not required. Other family members like the MCP795B10 offer similar functionality but with reduced 1 Kbit EEPROM capacity.