DS1244-DS1244P.pdf part of Keithley DS1244-DS1244P DS1244-DS1244P.pdf, Keithley 2001 ds Digital DS1244-DS1244P.pdf text manual preview

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19-6077; Rev 11/11

www.maxim-ic.com DS1244/DS1244P
256K NV SRAM with Phantom Clock

FEATURES PIN CONFIGURATIONS
Real-Time Clock (RTC) Keeps Track of TOP VIEW
Hundredths of Seconds, Minutes, Hours,
Days, Date of the Month, Months, and Years A14/RST 1 28 VCC
32K x 8 NV SRAM Directly Replaces 2
DS1244 27 WE
A12
Volatile Static RAM or EEPROM A7 3 26 A13
A6 4 25 A8
Embedded Lithium Energy Cell Maintains 5 24 A9
A5
Calendar Operation and Retains RAM Data A4 6 23 A11
Watch Function is Transparent to RAM A3 7 22 OE
8 21 A10
Operation A2
A1 9 20 CE
Automatic Leap Year Compensation Valid A0 10 19 DQ7
Up to 2100 DQ0 11 18 DQ6
Full 10% Operating Range DQ1 12 17 DQ5

Over 10 Years of Data Retention in the DQ2 13 16 DQ4
14 15
Absence of Power GND DQ3

Lithium Energy Source is Electrically EDIP Module
Disconnected to Retain Freshness Until (740 mils)
Power is Applied for the First Time
DIP Module Only RST 1
DS1244P 34 N.C.
N.C.
N.C. 2 33
Standard 28-Pin JEDEC Pinout N.C. 3 32 A14
4 31 A13
PowerCap Module Board Only N.C.
VCC 5 30 A12
6 29 A11