STMicroelectronics Debuts Real-Time Clock with EEPROM, Embedded Crystal

STMicroelectronics (NYSE: STM), a leader in offering a wide range of high-performance analog and mixed-signal products, introduced 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). ST’s new M41T56C64, reduces board space, increases reliability, and lowers manufacturing costs, making it an ideal choice for applications requiring accurate timekeeping and non-volatile data storage. Among these applications are metering devices, medical equipment, vending machines, and Point of sale (POS) terminals.

STMicroelectronics' New Real-Time Clock Chip with EEPROM and Embedded Crystal

The Real-Time Clock (RTC) section of the device 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. Embedding the crystal also provides better protection against the corrosive effects of moisture and humidity while avoiding manual insertion during board assembly.

The M41T56C64 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.

The EEPROM-RTC-crystal combination is built with ST’s proven stacked die packaging technology, which enables the integration levels of hybrid technology for only a slight additional cost over monolithic packaging. Allowing users to significantly reduce board space, the M41T56C64 is rated for 4.5 to 5.5 volts and operates over the industrial temperature range,–40° C to +85°C.

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

About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today’s convergence markets. The Company’s shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2005, the Company’s net revenues were $8.88 billion and net earnings were $266 million.