MCP7940N Series

Battery-Backed I2C Real-Time Clock/Calendar with SRAM

Catalog

Battery-Backed I2C Real-Time Clock/Calendar with SRAM

Part	Memory Size	Supplier Device Package	Type	Voltage - Supply, Battery [Min]	Voltage - Supply, Battery [Max]	Time Format	Mounting Type	Qualification	Interface	Grade	Features	Package / Case	Package / Case [custom]	Package / Case [custom]	Voltage - Supply [Min]	Voltage - Supply [Max]	Current - Timekeeping (Max)	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case [y]	Package / Case [x]	Package / Case	Current - Timekeeping (Max) [Max]	Package / Case
Microchip Technology MCP7940N-I/ST	64 B	8-TSSOP	Clock/Calendar	1.3 V	5.5 V	HH:MM:SS (12/24 hr)	Surface Mount	AEC-Q100	2-Wire Serial I2C	Automotive	Alarm Leap Year Square Wave Output SRAM	8-TSSOP	0.173 "	4.4 mm	1.8 V	5.5 V	1.2 µA	85 °C	-40 °C
Microchip Technology MCP7940NT-E/SN	64 B	8-SOIC	Clock/Calendar	1.3 V	5.5 V	HH:MM:SS (12/24 hr)	Surface Mount	AEC-Q100	2-Wire Serial I2C	Automotive	Alarm Leap Year Square Wave Output SRAM	8-SOIC			1.8 V	5.5 V	1.2 µA	125 °C	-40 °C	3.9 mm	0.154 in
Microchip Technology MCP7940NT-I/MS	64 B	8-MSOP	Clock/Calendar	1.3 V	5.5 V	HH:MM:SS (12/24 hr)	Surface Mount	AEC-Q100	2-Wire Serial I2C	Automotive	Alarm Leap Year Square Wave Output SRAM	8-MSOP 8-TSSOP	0.118 in		1.8 V	5.5 V	1.2 µA	85 °C	-40 °C			3 mm
Microchip Technology MCP7940N-I/MS	64 B	8-MSOP	Clock/Calendar	1.3 V	5.5 V	HH:MM:SS (12/24 hr)	Surface Mount	AEC-Q100	2-Wire Serial I2C	Automotive	Alarm Leap Year Square Wave Output SRAM	8-MSOP 8-TSSOP	0.118 in		1.8 V	5.5 V	1.2 µA	85 °C	-40 °C			3 mm
Microchip Technology MCP7940NT-E/MS	64 B	8-MSOP	Clock/Calendar	1.3 V	5.5 V	HH:MM:SS (12/24 hr)	Surface Mount	AEC-Q100	2-Wire Serial I2C	Automotive	Alarm Leap Year Square Wave Output SRAM	8-MSOP 8-TSSOP	0.118 in		1.8 V	5.5 V	1.2 µA	125 °C	-40 °C			3 mm
Microchip Technology MCP7940M-I/P	64 B	8-PDIP	Clock/Calendar			HH:MM:SS (12/24 hr)	Through Hole		2-Wire Serial I2C		Alarm Leap Year Square Wave Output SRAM	8-DIP			1.8 V	5.5 V		85 °C	-40 °C			0.3 in	1 µA	7.62 mm
Microchip Technology MCP7940N-I/SN	64 B	8-SOIC	Clock/Calendar	1.3 V	5.5 V	HH:MM:SS (12/24 hr)	Surface Mount	AEC-Q100	2-Wire Serial I2C	Automotive	Alarm Leap Year Square Wave Output SRAM	8-SOIC			1.8 V	5.5 V	1.2 µA	85 °C	-40 °C	3.9 mm	0.154 in
Microchip Technology MCP7940M-I/MS	64 B	8-MSOP	Clock/Calendar			HH:MM:SS (12/24 hr)	Surface Mount		2-Wire Serial I2C		Alarm Leap Year Square Wave Output SRAM	8-MSOP 8-TSSOP	0.118 in		1.8 V	5.5 V		85 °C	-40 °C			3 mm	1 µA
Microchip Technology MCP7940NT-I/MNY	64 B	8-TDFN (2x3)	Clock/Calendar	1.3 V	5.5 V	HH:MM:SS (12/24 hr)	Surface Mount	AEC-Q100	2-Wire Serial I2C	Automotive	Alarm Leap Year Square Wave Output SRAM	8-WFDFN Exposed Pad			1.8 V	5.5 V	1.2 µA	85 °C	-40 °C
Microchip Technology MCP7940MT-I/MS	64 B	8-MSOP	Clock/Calendar			HH:MM:SS (12/24 hr)	Surface Mount		2-Wire Serial I2C		Alarm Leap Year Square Wave Output SRAM	8-MSOP 8-TSSOP	0.118 in		1.8 V	5.5 V		85 °C	-40 °C			3 mm	1 µA

Catalog

Battery-Backed I2C Real-Time Clock/Calendar with SRAM

Key Features

• * Battery-Backed Real-Time Clock/Calendar (RTCC)

• * Hours, Minutes, Seconds, Day of Week, Day, Month, Year

• * Leap year compensated to 2399

• * 12/24 hour modes

• * On-Chip Digital Trimming/Calibration

• * 1 PPM Resolution

• * ±129 PPM Range

• * Dual Programmable Alarms

• * Versatile Output Pin

• * Clock output with selectable frequency

• * Alarm output

• * General Purpose output

• * Time logged on switchover to and from Battery Backup

• * 64 Bytes Battery-Backed SRAM

• * I2C Clock Frequency up to 400 kHz

• * Operating Voltage 1.8V to 5.5V

• * Backup Voltage 1.3V to 5.5V

• * Low Typical Timekeeping Current

• * Automatic Switchover to Battery Backup

Description

The MCP7940N series of low-power Real-Time Clocks (RTC) uses digital timing compensation for an accurate clock/calendar, a programmable output control for versatility, and a power sense circuit that automatically switches to the backup supply. Using a low-cost 32.768 kHz crystal, it tracks time using several internal registers. For communication, the MCP7940N uses the I2C™ bus. The clock/calendar automatically adjusts for months with fewer than 31 days, including corrections for leap years. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator and settable alarm(s) to the second, minute, hour, day of the week, date or month. Using the programmable CLKOUT, frequencies of 32.768, 8.192 and 4.096 kHz and 1 Hz can be generated from the external crystal. The device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V, but can operate down to 1.3V for timekeeping and SRAM retention only.