Real-Time Clock With NV RAM Control Extends the Dallas Semiconductor DS1558x Watchdog Clock Family.Business Editors/High-Tech Writers DALLAS--(BUSINESS WIRE)--Aug. 13, 2002 Dallas Semiconductor (Nasdaq:MXIM) introduces the DS1558 watchdog clock with nonvolatile memory (NV RAM) control designed to complement the existing DS155x family of watchdog timekeeper modules. When combined with an external crystal, battery, and SRAM See static RAM. SRAM - static random-access memory , the DS1558 gives the same functionality as the DS155x modules. The DS1558 provides system designers with another choice in PCB PCB: see polychlorinated biphenyl. PCB in full polychlorinated biphenyl Any of a class of highly stable organic compounds prepared by the reaction of chlorine with biphenyl, a two-ring compound. layout and component selection, while maintaining a common feature set. The DS1558 is a full-function, real-time clock/calendar (RTC See real time clock. ) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and NV SRAM controller. User access to all registers within the DS1558 is accomplished with a bytewide interface. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary coded decimal See BCD. (data) binary coded decimal - (BCD, packed decimal) A number representation where a number is expressed as a sequence of decimal digits and then each decimal digit is encoded as a four-bit binary number (a nibble). E.g. (BCD (Binary Coded Decimal) The storage of numbers in which each decimal digit is converted into binary and is stored in a single character or byte. For example, a 12-digit number would take 12 bytes. See binary numbers. ) format. Corrections for day of month and leap year are made automatically. The DS1558 also contains its own power-fail circuitry, which automatically protects the data in the clock and nonvolatile memory against out-of-tolerance V(CCI) conditions by inhibiting the CE-bar input when the V(CC) supply enters an out-of-tolerance condition. When V(CCI) goes below the level of V(BAT), the external battery is switched on to supply energy to the clock and the external SRAM. This feature provides a high degree of data security during unpredictable system operation brought on by low V(CC) levels. Available in a 48-pin TQFP See QFP. , the DS1558 operates on either 5V or 3.3V power supplies and is available in the extended-industrial temperature range (-40 degrees C to +85 degrees C). Prices start at $3.92 (1000-up, FOB USA). Dallas Semiconductor is a wholly owned subsidiary Wholly Owned Subsidiary A subsidiary whose parent company owns 100% of its common stock. Notes: In other words, the parent company owns the company outright and there are no minority owners. of Maxim Integrated Products, a leading international supplier of quality analog and mixed-signal products for applications that require real world signal processing. For more information, contact Maxim at 120 San Gabriel Dr., Sunnyvale, CA 94086. Telephone: 408/737-7600 or our URL URL in full Uniform Resource Locator Address of a resource on the Internet. The resource can be any type of file stored on a server, such as a Web page, a text file, a graphics file, or an application program. : www.maxim-ic.com. DATA SHEET: A Data Sheet for this product is available on the web: www.maxim-ic.com/DS1558 PREVIEW image (smaller image to view in Navigator or Explorer): http://dbserv.maxim-ic.com/PRGraphics/images/DSPR1558.jpg JPEG (300 dpi, high quality, RGB color) http://dbserv.maxim-ic.com/PRGraphics/images/DS1558.jpg TIFF (300 dpi uncompressed CMYK TIF, in a .ZIP archive*) http://dbserv.maxim-ic.com/PRGraphics/images/DS1558-cmyk-tif.zip (* Use Winzip, StuffIt Expander or similar de-archive utility to access the .ZIP file) |
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