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Real-time clock has EEPROM, embedded crystal

Posted: 05 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:ST? M41T56C64? Real-Time Clock? EEPROM? RTC?

M41T56C64 RTC from ST

STMicroelectronics has introduced a high-accuracy Serial Real-Time Clock (RTC) that adds EEPROM and an embedded crystal in a single, space-saving 18-pin small-outline IC (SOIC). The new M41T56C64 reduces board space, increases reliability and lowers manufacturing costs, the company said, making it a suitable choice for applications requiring accurate timekeeping and non-volatile data storage. Among these applications are metering devices, medical equipment, vending machines and POS terminals.

The RTC section of the device provides year, month and day data along with hours, minutes and seconds. Drawing 450nA (typical), the IC can accurately keep time for more than 10yrs on a 48mAh Li 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 I?C serial bus. The M41T56C64 also embeds the pre-calibrated 32kHz 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 8bytes of binary-coded decimal (BCD) registers used for the clock/calendar functions, 56bytes 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 the company'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 4.5-5.5V and operates over the industrial temperature range, -40C to 85C.

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

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