MCP795W20T-I/SL

Real Time Clock Overview

The MCP795W20T-I/SL is a battery-backed SPI Real-Time Clock/Calendar (RTCC) from Microchip Technology. It tracks time using internal counters for hours, minutes, seconds, hundredths of seconds, day of week, date, month, and year, with leap year compensation to 2399. The device features 2 Kbit EEPROM, 64 bytes of battery-backed SRAM, and a 128-bit protected EEPROM area. Operating voltage ranges from 1.8V to 3.6V, with backup support down to 1.3V. Typical timekeeping current is 1.2 µA at 3.0V. It includes dual programmable alarms, a watchdog timer, event detect modules, and digital trimming for ±259 ppm accuracy.

Real Time Clock Feature Summary

• SPI Interface: Supports clock rates up to 5 MHz for efficient communication.
• Memory Configuration: Includes 2 Kbit EEPROM, 64-byte SRAM, and 128-bit protected EEPROM.
• Timekeeping Accuracy: Features on-chip digital trimming with ±1 ppm resolution over a ±259 ppm range.
• Low Power Operation: Draws 1.2 µA typical current at 3.0V; automatic switchover to VBAT.

Real Time Clock Applications

• Industrial systems requiring accurate timekeeping in wide temperature ranges.
• Consumer electronics needing compact RTC solutions with integrated memory.
• Battery-powered devices utilizing low standby current capabilities.

Real Time Clock Procurement Notes

Verify the specific ordering suffix 'I/SL' corresponds to the Industrial temperature range (-40°C to +85°C) and SOIC-14 package as defined in the manufacturer's datasheet DS20002280E. Confirm that the '20' designation indicates the 2 Kbit EEPROM variant without pre-programmed EUI addresses. Ensure compatibility with system voltage levels and SPI protocol requirements before integration.

Real Time Clock Selection Notes

Select this component when a 2 Kbit EEPROM capacity is required alongside standard RTCC functions. The MCP795W20 differs from the MCP795W10 by offering double the EEPROM storage. Consider the MCP795W21 if an EUI-48 MAC address is needed instead of blank protected memory. Verify that the 14-pin SOIC package fits the PCB layout constraints compared to TSSOP alternatives.

Real Time Clock Part Context

This part belongs to the MCP795WXX family of battery-backed SPI RTCCs. It shares functional similarities with the MCP795W1X series but provides increased non-volatile storage. The device integrates general-purpose memory and security features, reducing the need for external chips in embedded designs.

Real Time Clock Replacement Considerations

The MCP795W10T-I/SL is a compatible alternative if only 1 Kbit EEPROM is sufficient. For EUI-48 addressing, the MCP795W21T-I/SL serves as a direct functional substitute with pre-programmed identity data.