DS1302
Trickle-Charge Timekeeping Chip
www.maxim-ic.com
FEATURES
PIN CONFIGURATIONS
ꢀ
Real-Time Clock Counts Seconds, Minutes,
Hours, Date of the Month, Month, Day of the
Week, and Year with Leap-Year
TOP VIEW
VCC1
SCLK
I/O
VCC2
X1
X2
1
2
3
4
8
7
6
5
Compensation Valid Up to 2100
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
31 x 8 RAM for Scratchpad Data Storage
Serial I/O for Minimum Pin Count
2.0V to 5.5V Full Operation
CE
GND
DIP (300 mils)
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
VCC2
X1
X2
1
2
3
4
8
7
6
5
VCC1
SCLK
I/O
ꢀ
8-Pin DIP or Optional 8-Pin SO for Surface
Mount
GND
CE
ꢀ
ꢀ
ꢀ
Simple 3-Wire Interface
TTL-Compatible (VCC = 5V)
SO (208 mils/150 mils)
Optional Industrial Temperature Range:
-40°C to +85°C
ꢀ
ꢀ
DS1202 Compatible
Underwriters Laboratory (UL) Recognized
VCC2
N.C.
X1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC1
N.C.
SCLK
N.C.
ORDERING INFORMATION
PART
DS1302
DS1302+
DS1302N
DS1302N+
DS1302S
DS1302S+
DS1302SN
DS1302SN+
DS1302Z
DS1302Z+
DS1302ZN
DS1302ZN+
DS1302S-16
DS1302SN-16
TEMP RANGE
PIN-PACKAGE
TOP MARK*
DS1302
DS1302
DS1302
N.C.
X2
N.C.
N.C.
GND
I/O
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
8 PDIP (300 mils)
8 PDIP (300 mils)
8 PDIP (300 mils)
8 PDIP (300 mils)
8 SO (208 mils)
8 SO (208 mils)
8 SO (208 mils)
8 SO (208 mils)
8 SO (150 mils)
8 SO (150 mils)
8 SO (150 mils)
8 SO (150 mils)
16 SO (300 mils)
16 SO (300 mils)
N.C.
N.C.
CE
DS1302
DS1302S
DS1302S
DS1302S
DS1302S
DS1302Z
DS1302Z
DS1302ZN
DS1302ZN
DS1302S16
DS1302SN16
SO (300 mils)
+ Denotes a lead-free/RoHS-compliant device.
*An N anywhere on the top mark indicates an industrial temperature grade
device. A + anywhere on the top mark indicates a lead-free device.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
1 of 16
REV: 110805