19-6076; Rev 11/11
DS1243Y
64K NV SRAM with Phantom Clock
FEATURES
Real-Time Clock Keeps Track of Hundredths
of Seconds, Seconds, Minutes, Hours, Days,
Date of the Month, Months, and Years
8K x 8 NV SRAM Directly Replaces
Volatile Static RAM or EEPROM
Embedded Lithium Energy Cell Maintains
Calendar Operation and Retains RAM Data
Watch Function is Transparent to RAM
Operation
Automatic Leap Year Compensation Valid
Up to 2100
Lithium Energy Source is Electrically
Disconnected to Retain Freshness Until
Power is Applied for the First Time
Standard 28-Pin JEDEC Pinout
Full ±10% Operating Range
Accuracy is Better than ±1 Minute/Month at
+25°C
Over 10 Years of Data Retention in the
Absence of Power
Available in 120ns Access Time
Underwriters Laboratories (UL) Recognized
(www.maxim-ic.com/qa/info/ul)
PIN CONFIGURATION
TOP VIEW
RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1 28
2
3
DS1243Y
27
26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
VCC
WE
N.C.
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
Encapsulated Package
(720-Mil Extended)
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS1243Y-120+ 0°C to +70°C 28 EDIP (0.720a)
+ Denotes a lead(Pb)-free/RoHS-compliant package.
1 of 14