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DS1386P Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS1386P Datasheet(HTML) 2 Page - Dallas Semiconductor |
2 / 20 page DS1386/DS1386P 2 of 20 ORDERING INFORMATION DS1386 XX-120 32-pin DIP Module 08 8k x 8 NV SRAM 32 32k x 8 NV SRAM *DS1386P XX-120 34-pin PowerCap® Module Board 08 8k x 8 NV SRAM 32 32k x 8 NV SRAM *DS9034PCX PowerCap required (must be ordered separately) PIN DESCRIPTION INTA - Interrupt Output A (open drain) INTB (INTB) - Interrupt Output B (open drain) A0-A14 - Address Inputs DQ0-DQ7 - Data Input/Output CE - Chip Enable OE - Output Enable WE - Write Enable VCC - +5V GND - Ground SQW - Square Wave Output NC - No Connection X1, X2 - Crystal Connection VBAT - Battery Connection DESCRIPTION The DS1386 is a nonvolatile static RAM with a full-function Real Time Clock (RTC), alarm, watchdog timer, and interval timer which are all accessible in a byte-wide format. The DS1386 contains a lithium energy source and a quartz crystal, which eliminates the need for any external circuitry. Data contained within 8k or 32k by 8-bit memory and the timekeeping registers can be read or written in the same manner as bytewide static RAM. The timekeeping registers are located in the first 14 bytes of memory space. Data is maintained in the RAMified Timekeeper by intelligent control circuitry, which detects the status of VCC and write protects memory when VCC is out of tolerance. The lithium energy source can maintain data and real time for over ten years in the absence of VCC. Timekeeper information includes hundredths of seconds, seconds, minutes, hours, day, date, month, and year. The date at the end of the month is automatically adjusted for months with less than 31 days, including correction for leap year. The RAMified Timekeeper operates in either 24-hour or 12-hour format with an AM/PM indicator. The watchdog timer provides alarm interrupts and interval timing between 0.01seconds and 99.99 seconds. The real time alarm provides for preset times of up to one week. Interrupts for both watchdog and RTC will operate when system is powered down. Either can provide system “wake-up” signals. |
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