DS1302
Trickle-Charge Timekeeping Chip
PIN CONFIGURATIONS
TOP VIEW
VCC2
1
8
VCC1
X1
2
7
SCLK
X2
3
6
I/O
GND
4
5
CE
DS1302
Real-Time Clock Counts Seconds, Minutes,
Hours, Date of the Month, Month, Day of the
Week, and Year with Leap-Year
Compensation Valid Up to 2100
31 x 8 Battery-Backed General-Purpose RAM
Serial I/O for Minimum Pin Count
2.0V to 5.5V Full Operation
Uses Less than 300nA at 2.0V
Single-Byte or Multiple-Byte (Burst Mode)
Data Transfer for Read or Write of Clock or
RAM Data
8-Pin DIP or Optional 8-Pin SO for Surface
Mount
Simple 3-Wire Interface
TTL-Compatible (VCC = 5V)
Optional Industrial Temperature Range:
-40°C to +85°C
DS1202 Compatible
Underwriters Laboratories (UL®)
Recognized
DIP (300 mils)
VCC2
1
8
VCC1
X1
2
7
SCLK
X2
3
6
I/O
GND
4
5
CE
DS1302
FEATURES
SO (208 mils/150 mils)
ORDERING INFORMATION
PART
DS1302+
DS1302N+
DS1302S+
DS1302SN+
DS1302Z+
DS1302ZN+
TEMP RANGE
0°C
Functional to +70°C
Diagrams
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
8 PDIP (300 mils)
8 PDIP (300 mils)
8 SO (208 mils)
8 SO (208 mils)
8 SO (150 mils)
8 SO (150 mils)
TOP MARK*
DS1302
DS1302
DS1302S
DS1302S
DS1302Z
DS1302ZN
+Denotes a lead-free/RoHS-compliant package.
*An N anywhere on the top mark indicates an industrial temperature grade device. A + anywhere on the top mark indicates a lead-free device.
UL is a registered trademark of Underwriters Laboratories, Inc.
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
REV: 120208
