M41T56C64 Serial Real-Time Clock (RTC) with EEPROM, NVRAM and On-chip Crystal

STMicroelectronics introduced (29 Nov, 2006) the M41T56C64 a high accuracy Serial Real-Time Clock (RTC) which adds EEPROM and an embedded crystal in a single, space-saving 18-pin SOIC (Small-Outline Integrated Circuit).

Feature Summary:

• 5V ±10% supply voltage

• I2C bus compatible

• Operating temperature of –40 to 85°C

• Packaging includes:

• 18-lead SOIC (with embedded crystal)

• RoHS compliant

Picture of M41T56C64 Serial Real-Time Clock

Serial RTC features

The Real-Time Clock (RTC) section of the M41T56C64 provides year, month and day data along with hours, minutes, and seconds. Drawing only 450nA (typical), the IC can accurately keep time for more than ten years on a 48mAh lithium coin cell. The EEPROM section has 8192 bytes of memory with more than 1 million erase/write cycles per byte. The RTC and the EEPROM are accessed via a two-wire I2C (Inter-Integrated Circuit) serial bus. The M41T56C64 also embeds the pre-calibrated 32-kHz crystal, with ±5ppm accuracy guaranteed even after two reflows.

The M41T56C64 Real-Time Clock includes 8 bytes of BCD (binary-coded decimal) registers used for the clock/calendar functions, 56 bytes of NVRAM and 8Kbytes of EEPROM. When power is removed, the device automatically switches to its backup battery input and goes into a low-current mode to maximize battery life.

Available now for production orders, the M41T56C64 is $1.35 each in high volumes.

Source: STMicroelectronics-RTC