DS1647 - Maxim Integrated

DS1647 Nonvolatile Timekeeping RAM

PIN PDIP PowerCap 1 34 23 3 32 4 30 5 25 6 24 7 23 8 22 9 21 10 20 11 19 12 18 23 28 25 29 26 27 27 26 28 31 30 33 31 2 13 16 14 15 15 14 17 13 18 12 19 11 20 10 21 9 16 17 22 8 24 7 29 6 32 5 —4 —1 — NAME A18 A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 A10 A11 A9 A8 A13 A17 A15 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 GND CE OE WE VCC PFO N.C. X1, X2, VBAT FUNCTION Addres.

Features

PIN CONFIGURATIONS
 Integrates NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source
 Clock Registers Are Accessed Identically to the Static RAM. These Registers are Resident in the Eight Top RAM Locations.
 Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
 BCD Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Leap Year Compensation Valid Through 2099
 Power-Fail Write Protection Allows for ±10% VCC Power-Supply Tolerance
 DS1647 Only (DIP Module): Standard JEDEC Byte-Wide 128k x 8 RAM Pinout TOP VIEW A18 A16 .