DS1647
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 pensation 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 A14 A12
A7 A6 A5 A4 A3 A2 A1
A0
DQ0
DQ1
DQ2
1 32 2 31 3 DS1647 30 4 29 5 28 6 27 7 26 8 25 9 24 10 23 11 22 12 21
13 20
14 19
15 18
16 17
VCC A15 A17 WE A13 A8 A9 A11 OE A10 CE
DQ7
DQ6
DQ5
DQ4
DQ3
32-Pin Encapsulated DIP Package (32 Pin 740)
- DS1647P Only (Power Cap Module Board):
Surface Mountable Package for Direct Connection to Power Cap Containing Battery and Crystal
Replace...
