DS1486

DS1486/DS1486P RAMified Watchdog Timekeeper www.maxim-ic.com 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 www.DataSheet4U.com activities such as system wakeup § Programmable interrupts and square wave output § All registers are individually addressable via the address and data bus § Interrupt signals active in power-down mode § § PIN ASSIGNMENT INTB (INTB) A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 VCC A15 INTA/SQW WE A13 A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3 ORDERING INFORMATION DS1486 XXX (32–pin DIP module) –150 150 ns access –120 120 ns access 34-pin PowerCap Module Board –150 150 ns access –120 120 ns access DS1486 128k x 8 32-Pin Encapsulated Package *DS1486P XXX *DS9034PCX PowerCap Required (must be ordered separately) PIN DESCRIPTION – Interrupt Output A (open drain) INTB (INTB) – Interrupt Output B (open drain) A0–A16 – Address Inputs DQ0–DQ7 – Data Input/Output CE – Chip Enable OE – Output Enable WE – Write Enable VCC – +5 Volts GND – Ground SQW – Square Wave Output NC – No Connection X1, X2 – Crystal Connection VBAT – Battery Connection INTB INTB (INTB) A15 A16 PFO VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 ...