DS1497 Datasheet | Dallas Semiconductor

FEATURES PIN ASSIGNMENT A0 A1 X2 X1 STBY D0 D1 D2 D3 D4 D5 D6 D7 V SS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 A2 A3 VDD SQW A4 A5 VBAT IRQ RESET RD BGND WR XRAM RTC - Ideal for EISA bus PCs - Functionally patible mode with MC146818 in 32 KHz - Totally nonvolatile with over 10 years of operation in .. the absence of power subsystem includes lithium, quartz, and support circuitry seconds, minutes, hours, day of the week, date, month, and year with leap year pensation alarm - Self-contained - Counts - Binary or BCD representations of time, calendar, and - 12- or 24-hour clock with AM and PM in 12-hour mode - Daylight Savings Time option - Interfaced with software as 64 register/RAM locations plus 8K x 8 of static RAM - 14 bytes of clock and control registers - 50 bytes of general and control registers - Separate 8K x 8 nonvolatile SRAM DS1495S 28-Pin SOIC (330 mil) A0 A1 X2 X1 STBY D0 D1 D2 D3 D4 D5 D6 D7 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 A2 A3 VDD SQW A4 A5 VBAT IRQ RESET RD BGND WR XRAM RTC - Programmable square wave output signal - Bus-patible interrupt signals (IRQ) - Three interrupts are separately software-maskable and testable: - Time-of-day alarm once/second to once/day - Periodic rates from 122 µs to 500 ms - End-of-clock update cycle DS1495 28-Pin DIP (600 mil) A0 A1 NC NC STBY D0 D1 D2 D3 D4 D5 D6 D7 V SS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 A2 A3 VDD SQW A4 A5 NC IRQ RESET RD NC WR XRAM RTC - 28-pin JEDEC footprint - Available as chip (DS1495/DS1495S) or stand alone module with embedded lithium battery and crystal (DS1497) ORDERING INFORMATION DS1495 DS1495S DS1497 RTC Chip; 28- pin DIP RTC Chip; 28- pin SOIC RTC Module; 28- pin DIP DS1497 28-Pin Encapsulated Package (720 mil) ECopyright 1995 by Dallas Semiconductor Corporation. All Rights Reserved. For important information regarding patents and other intellectual property...