MCP79521 Series

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

Catalog

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

Part	Package / Case	Package / Case [x]	Package / Case [x]	Features	Voltage - Supply, Battery [Max]	Voltage - Supply, Battery [Min]	Time Format	Mounting Type	Type	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Supply [Max]	Voltage - Supply [Min]	Memory Size	Current - Timekeeping (Max)	Interface
Microchip Technology MCP79521T-I/MS	10-MSOP 10-TFSOP	3 mm	0.118 in	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID	3.6 V	1.3 V	HH:MM:SS:hh (12/24 hr)	Surface Mount	Clock/Calendar	10-MSOP	85 °C	-40 °C	3.6 V	1.8 V	64 B	1 µA	SPI

Catalog

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

Key Features

• * VCC Min = 1.8V

• * Icc < 5 µA (Typical Standby Current)

• * VBAT Min = 1.3V

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

• * VCC to VBAT (VCC Lost)

• * VBAT to VCC (VCC Restored)

• * IRQ (VCC or VBAT)

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

• * Adjusts up to 22 seconds/day

• * Protect: None, 1/4, 1/2 or all of array

• * Factory standard MAC address programming or custom ID available

Description

The MCP79521 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.