MCP795B20T-I/SL

Real Time Clock Overview

The MCP795B20T-I/SL is a low-power SPI Real-Time Clock/Calendar (RTCC) from Microchip Technology, housed in a 14-lead SOIC package. It features a 32 kHz boot-up clock at power-up, 64 bytes of battery-backed SRAM, and 2 Kbits of EEPROM with software block write-protect. The device supports two programmable alarms, a watchdog timer, and dual configurable event detect inputs. Operating voltage ranges from 1.8V to 5.5V for VCC and 1.3V to 5.5V for VBAT, with standby current under 1µA at 3V.

Real Time Clock Feature Summary

• Integrated 32 kHz Boot-up Clock on CLKOUT/BOOT pin
• 2 Kbit EEPROM and 64-byte Battery-Backed SRAM
• Dual Programmable Alarms with IRQ or WDO support
• SPI Interface with speeds up to 10 MHz

Real Time Clock Applications

• Systems requiring accurate timekeeping with millisecond alarm resolution
• Applications needing automatic power-fail time-stamping
• Devices utilizing external event detection via EVHS/EVLS inputs

Real Time Clock Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging and 'SL' denotes the SOIC-14 package variant. Confirm the 'I' designation matches industrial temperature range requirements (-40°C to +85°C). Ensure the blank Unique ID configuration aligns with system security needs, as this specific part number does not include preprogrammed MAC addresses.

Real Time Clock Selection Notes

Select this model over the MCP795W20 series specifically when a 32 kHz clock output at power-up is required for system initialization. The 2 Kbit EEPROM capacity distinguishes it from the 1 Kbit variants like the MCP795B10. Ensure the design accommodates the 14-pin SOIC footprint and utilizes an external 32,768 kHz tuning fork crystal for oscillator operation.

Real Time Clock Part Context

This component belongs to the MCP795BXX family, which shares features with the MCP795WXX series but adds the 32 kHz boot-up capability. It is designed to reduce component count by integrating memory, RTC, and enhanced peripheral functions into a single compact package suitable for space-constrained designs.

Real Time Clock Replacement Considerations

The MCP795W20T-I/SL is a functional substitute if the 32 kHz boot-up feature is not required. For systems needing 1 Kbit EEPROM, the MCP795B10T-I/SL may be considered, provided memory capacity adjustments are made.