DS1302
Trickle-Charge Timekeeping Chip
www.maxim-ic.com
FEATURES
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 RAM for Scratchpad Data Storage
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 (V
CC
= 5V)
Optional Industrial Temperature Range:
-40°C to +85°C
DS1202 Compatible
Underwriters Laboratory (UL) Recognized
PIN CONFIGURATIONS
TOP VIEW
V
CC2
X1
X2
GND
1
8
V
CC1
SCLK
I/O
CE
3
4
DS1302
2
7
6
5
DIP (300 mils)
V
CC2
X1
X2
GND
1
DS1302
2
3
4
8
7
6
5
V
CC1
SCLK
I/O
CE
SO (208 mils/150 mils)
V
CC2
N.C.
X1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC1
N.C.
SCLK
N.C.
I/O
N.C.
N.C.
CE
PART
DS1302
DS1302+
DS1302N
DS1302N+
DS1302S
DS1302S+
DS1302SN
DS1302SN+
DS1302Z
DS1302Z+
DS1302ZN
DS1302ZN+
DS1302S-16
DS1302SN-16
TEMP RANGE
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
PIN-PACKAGE
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)
TOP MARK*
DS1302
DS1302
DS1302
DS1302
DS1302S
DS1302S
DS1302S
DS1302S
DS1302Z
DS1302Z
DS1302ZN
DS1302ZN
DS1302S16
DS1302SN16
N.C.
X2
N.C.
N.C.
GND
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:
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DS1302
ORDERING INFORMATION
REV: 110805