DS1642 Datasheet - Maxim Integrated

DS1642 - Nonvolatile Timekeeping RAM

PIN NAME FUNCTION 1 A7 2 A6 3 A5 4 A4 5 A3 6 A2 Address Input 7 A1 8 A0 19 A10 22 A9 23 A8 9 DQ0 10 DQ1 11 DQ2 13 14 DQ3 DQ4 Data Input/Output 15 DQ5 16 DQ6 17 DQ7 12 GND Ground 18 CE Active-Low Chip-Enable Input 20 OE Active-Low Output-Enable Input 21 WE Active-Low Write-Enab.

DS1642 Features

* Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source

* Standard JEDEC Bytewide 2k x 8 Static RAM Pinout

* Clock Registers are Accessed Identically to the Static RAM. These Registers are Resident in the Eight Top RAM Locations

* Totally

DS1642-MaximIntegrated.pdf