MCP79400 Series

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

Catalog

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

Part	Voltage - Supply, Battery [Min]	Voltage - Supply, Battery [Max]	Interface	Voltage - Supply [Min]	Voltage - Supply [Max]	Type	Memory Size	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Current - Timekeeping (Max)	Time Format	Supplier Device Package	Features	Package / Case	Package / Case [y]	Package / Case [x]	Package / Case [custom]	Package / Case	Package / Case [custom]
Microchip Technology MCP79400T-I/SN	1.3 V	5.5 V	2-Wire Serial I2C	1.8 V	5.5 V	Clock/Calendar	64 B	Surface Mount	85 °C	-40 °C	1.2 µA	HH:MM:SS (12/24 hr)	8-SOIC	Alarm Leap Year Square Wave Output SRAM Unique ID	8-SOIC	3.9 mm	0.154 in
Microchip Technology MCP79400-I/MS	1.3 V	5.5 V	2-Wire Serial I2C	1.8 V	5.5 V	Clock/Calendar	64 B	Surface Mount	85 °C	-40 °C	1.2 µA	HH:MM:SS (12/24 hr)	8-MSOP	Alarm Leap Year Square Wave Output SRAM Unique ID	8-MSOP 8-TSSOP			0.118 in	3 mm
Microchip Technology MCP79400-I/ST	1.3 V	5.5 V	2-Wire Serial I2C	1.8 V	5.5 V	Clock/Calendar	64 B	Surface Mount	85 °C	-40 °C	1.2 µA	HH:MM:SS (12/24 hr)	8-TSSOP	Alarm Leap Year Square Wave Output SRAM Unique ID	8-TSSOP			0.173 "		4.4 mm
Microchip Technology MCP79400T-I/MS	1.3 V	5.5 V	2-Wire Serial I2C	1.8 V	5.5 V	Clock/Calendar	64 B	Surface Mount	85 °C	-40 °C	1.2 µA	HH:MM:SS (12/24 hr)	8-MSOP	Alarm Leap Year Square Wave Output SRAM Unique ID	8-MSOP 8-TSSOP			0.118 in	3 mm
Microchip Technology MCP79400T-I/ST	1.3 V	5.5 V	2-Wire Serial I2C	1.8 V	5.5 V	Clock/Calendar	64 B	Surface Mount	85 °C	-40 °C	1.2 µA	HH:MM:SS (12/24 hr)	8-TSSOP	Alarm Leap Year Square Wave Output SRAM Unique ID	8-TSSOP			0.173 "		4.4 mm
Microchip Technology MCP79400-I/SN	1.3 V	5.5 V	2-Wire Serial I2C	1.8 V	5.5 V	Clock/Calendar	64 B	Surface Mount	85 °C	-40 °C	1.2 µA	HH:MM:SS (12/24 hr)	8-SOIC	Alarm Leap Year Square Wave Output SRAM Unique ID	8-SOIC	3.9 mm	0.154 in

Catalog

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

Key Features

• * VCC Min = 1.8V

• * Icc < 5 µA Typical Dynamic Current

• * VBAT Min = 1.3V

• * Ibat < 700nA Typical Timekeeping & SRAM Retention Current

• * VCC to VBAT (power lost)

• * VBAT to VCC (power restored)

• * Dual alarms with single Interrupt Output that operates on VCC or VBAT

• * Clock Out frequencies of 32.768, 8.192 & 4.096 KHz and 1 Hz

• * 1 ppm is approximately 86 milliseconds/day

• * Factory standard or custom ID programming available

Description

The MCP79400 general purpose I2CTM Compatible real-time clock/calendar (RTCC) is highly integrated with memory and advanced features normally found in higher priced devices. These features include a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. Using a low-cost 32,768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies. In addition to the SRAM memory, there a unique ID in a locked section of EEPROM that can be unlocked and programmed by the end user.