Specification	MCP795W21T-I/SL

Current - Timekeeping (Max)	1 µA
Features	Unique ID, Square Wave Output, EEPROM, Watchdog Timer, SRAM, Leap Year, Alarm
Interface	SPI
Memory Size	64 B
Mounting Type	Surface Mount
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Package / Case	14-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Time Format	HH:MM:SS:hh (12/24 hr)
Type	Clock/Calendar
Voltage - Supply [Max]	3.6 V
Voltage - Supply [Min]	1.8 V
Voltage - Supply, Battery [Max]	3.6 V
Voltage - Supply, Battery [Min]	1.3 V

MCP795W21 Series

Enhanced Feature Battery-Backed SPI Real-Time Clock/Calendar with Pre-Programmed EUI-48™ MAC ID

Part	Voltage - Supply, Battery [Max]	Voltage - Supply, Battery [Min]	Features	Memory Size	Package / Case [custom]	Package / Case [custom]	Package / Case	Interface	Supplier Device Package	Type	Time Format	Voltage - Supply [Max]	Voltage - Supply [Min]	Mounting Type	Current - Timekeeping (Max)	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case [x]	Package / Case [y]
Microchip Technology MCP795W21-I/ST	3.6 V	1.3 V	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID Watchdog Timer	64 B	0.173 "	4.4 mm	14-TSSOP	SPI	14-TSSOP	Clock/Calendar	HH:MM:SS:hh (12/24 hr)	3.6 V	1.8 V	Surface Mount	1 µA	85 °C	-40 °C
Microchip Technology MCP795W21T-I/ST	3.6 V	1.3 V	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID Watchdog Timer	64 B	0.173 "	4.4 mm	14-TSSOP	SPI	14-TSSOP	Clock/Calendar	HH:MM:SS:hh (12/24 hr)	3.6 V	1.8 V	Surface Mount	1 µA	85 °C	-40 °C
Microchip Technology MCP795W21-I/SL	3.6 V	1.3 V	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID Watchdog Timer	64 B			14-SOIC	SPI		Clock/Calendar	HH:MM:SS:hh (12/24 hr)	3.6 V	1.8 V	Surface Mount	1 µA	85 °C	-40 °C	0.154 in	3.9 mm
Microchip Technology MCP795W21T-I/SL	3.6 V	1.3 V	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID Watchdog Timer	64 B			14-SOIC	SPI		Clock/Calendar	HH:MM:SS:hh (12/24 hr)	3.6 V	1.8 V	Surface Mount	1 µA	85 °C	-40 °C	0.154 in	3.9 mm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tape & Reel (TR)	2600	$ 1.71
Microchip Direct	T/R	1	$ 1.94
		25	$ 1.80
		100	$ 1.70
		1000	$ 1.61
		5000	$ 1.54
Newark	Each (Supplied on Full Reel)	100	$ 1.76

Description

General part information

MCP795W21 Series

The MCP795W21 SPI RTCC is highly integrated with memory and advanced features normally found in higher priced devices. By starting with a basic real-time clock, digital trimming was added for higher accuracy, a battery switchover for backup power, a timestamp to log power failures and three types of memory, which includes SRAM, EEPROM and a unique ID in a locked section of EEPROM. This ID is preprogrammed with a 48-bit MAC Address, but it can also be ordered blank for the end user to program. By adding a watchdog timer and two programmable event detect inputs, lower power and more system robustness can be achieved by performaing these functions in the RTCC and allowing the MCU to sleep for longer periods of time.