DS1643-120 DALLAS [Dallas Semiconductor], DS1643-120 Datasheet - Page 10

• Manufacturer Part Number: DS1643-120
• Description: Nonvolatile Timekeeping RAM
• Manufacturer: DALLAS [Dallas Semiconductor]

NOTES:
1. All voltages are referenced to ground.
2. Typical values are at 25 C and nominal supplies.
3. Outputs are open.
4. Data retention time is at 25 C and is calculated from the date code on the device package. The date code XXYY
5. t
6. t
7. Real–Time Clock Modules can be successfully processed through conventional wave–soldering techniques as
OUTPUT LOAD
DS1643
041697 10/11
is the year followed by the week of the year in which the device was manufactured. For example, 9225, would
mean the 25th week of 1992.
long as temperature exposure to the lithium energy source contained within does not exceed +85 C. Post solder
cleaning with water washing techniques is acceptable, provided that ultrasonic vibration is not used.
AH1
AH2
D.U.T.
, t
, t
DH1
DH2
are measured from WE going high.
are measured from CE going high.
1K
+5 VOLTS
100 pF
1.8K