DS1486P-120

DS1486/DS1486P RAMified Watchdog Timekeepers www.maxim-ic.com ORDERING INFORMATION FEATURES § § § § § § § § 128 kbytes of User NV RAM Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit and Lithium Energy Source Totally Nonvolatile with Over 10 years of Operation in the Absence of Power Watchdog Timer Restarts an Out-of-Control Processor Alarm Function Schedules Real-Time-Related Activities such as System Wakeup Programmable Interrupts and Square-Wave Output All Registers are Individually Addressable Through the Address and Data Bus Interrupt Signals Active in Power-Down Mode TEMP RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C PART DS1486-120 DS1486-120+ DS1486P-120 DS1486P-120+ DS9034PCX DS9034PCX+ PINPACKAGE TOP MARK** 32 EDIP (0.740”) DS1486-120 32 EDIP (0.740”) DS1486-120 34 PowerCap®* 34 PowerCap* DS1486P120 DS1486P120 PowerCap DS9034PC PowerCap DS9034PC *DS9034PCX PowerCap required (must be ordered separately). **A ‘+’ indicates lead-free. The top mark will include a ‘+’ symbol on lead-free devices. PowerCap is a registered trademark of Dallas Semiconductor. PIN CONFIGURATIONS TOP VIEW 1 2 3 DS1486 4 5 6 7 8 9 10 11 12 32 31 30 29 28 27 26 25 24 23 22 21 VCC A15 DQ0 13 20 DQ6 DQ1 DQ2 14 19 DQ5 15 18 DQ4 GND 16 17 DQ3 INTB (INTB) A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 INTA/SQW WE A13 A8 A9 A11 OE A10 CE DQ7 INTB (INTB) A15 A16 PFO VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 DS1486P X1 GND VBAT X2 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 INTA SQW A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 34-Pin PowerCap Module Board (Uses DS9034PCX PowerCap) 128k x 8 32-Pin Encapsulated Package (32 PIN 740) 1 of 14 REV: 012505 DS1486/DS1486P PIN DESCRIPTION PDIP PIN PowerCap NAME FUNCTION 1 1 INTB (INTB) 2 3 4 5 6 7 8 9 10 11 12 23 25 26 27 28 31 13 14 15 17 18 19 20 21 3 32 30 25 24 23 22 21 20 19 18 28 29 27 26 31 2 16 15 14 13 12 11 10 9 A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 A10 A11 A9 A8 A13 A15 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 16 17 GND 22 8 CE Active-Low Chip Enable 24 7 OE Active-Low Output Enable 29 6 WE 30 — INTA/SQW 32 5 VCC — 4 PFO — 33 SQW — 34 INTA Active-Low Write Enable Active-Low, Interrupt A, Open-Drain Output and Square-Wave Output, Shared. Note: Both functions must not be enabled at the same time, or a conflict could occur. Power-Supply Input Active-Low Power-Fail Output, Open Drain. Requires a pullup resistor for proper operation. Square-Wave Output Active-Low Interrupt A, Output, Open Drain. Requires a pullup resistor for proper operation. — X1, X2, VBAT Active-Low Interrupt B, Output, Push-Pull Address Input Data Input/Output Ground Crystal Connections and Battery Connection 2 of 14 DS1486/DS1486P DESCRIPTION The DS1486 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 DS1486 contains a lithium energy source and a quartz crystal, which eliminate the need for any external circuitry. Data contained within 128K by 8-bit memory and the timekeeping registers can be read or written in the same manner as byte-wide 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 10 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 fewer 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 0.01 seconds 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 the system is powered down. Either can provide system “wake-up” signals. PACKAGES The DS1486 is available in two packages: a 32-pin DIP module and 34-pin PowerCap module. The 32pin DIP-style module integrates the crystal, lithium energy source, and silicon all in one package. The 32pin PowerCap Module Board is designed with contacts for connection to a separate PowerCap (DS90934PCX) that contains the crystal and battery. The design allows the PowerCap to be mounted on top of the DS1486P after the completion of the surface mount process. Mounting the PowerCap after the surface mount process prevents damage to the crystal and battery due to high temperatures required for solder reflow. The PowerCap is keyed to prevent reverse insertion. The PowerCap Module Board and PowerCap are ordered separately and shipped in separate containers. The part number for the PowerCap is DS9034PCX. Table 1. Truth Table VCC 5V ±10% VBAT