DS1644 Datasheet (Maxim Integrated) - Nonvolatile Timekeeping RAM

DS1644, Nonvolatile Timekeeping RAM

PIN PDIP PowerCap NAME 1 32 A14 2 30 A12 3 25 A7 4 24 A6 5 23 A5 6 22 A4 7 21 A3 8 20 A2 9 19 A1 10 18 A0 11 16 DQ0 12 15 DQ1 13 14 DQ2 14 17 GND 15 13 DQ3 16 12 DQ4 17 11 DQ5 18 10 DQ6 19 9 DQ7 20 8 CE 21 28 A10 22 7 OE 23 29 A11 24 27 A9 25 26 A8

DS1644 Features

* Integrated 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 Abs