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070900

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

2.0–5.5V full operation

Uses less than 300 nA 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 SOICs for

surface mount

Simple 3–wire interface

Optional industrial temperature range

–40°C to +85°C

DS1202 compatible

Recognized by Underwriters Laboratory

ORDERING INFORMATION

PART #

DESCRIPTION

DS1302

8–Pin DIP

DS1302N

8-Pin DIP (Industrial)

DS1302S

8–Pin SOIC (200 mil)

DS1302SN

8–Pin SOIC (Industrial)

DS1302Z

8–Pin SOIC (150 mil)

DS1302ZN

8–Pin SOIC (Industrial)

DS1302S-16

16-Pin SOIC (300 mil)

DS1302SN-16

16-Pin SOIC (Industrial)

PIN ASSIGNMENT

PIN DESCRIPTION

X1, X2

– 32.768 kHz Crystal Pins

GND

– Ground

RST

– Reset

I/O

– Data Input/Output

SCLK

– Serial Clock

– Power Supply Pins

DESCRIPTION

The DS1302 Trickle Charge Timekeeping Chip contains a real time clock/calendar and 31 bytes of static

RAM. It communicates with a microprocessor via a simple serial interface. The real time clock/calendar

provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is

automatically adjusted for months with less than 31 days, including corrections for leap year. The clock

operates in either the 24–hour or 12–hour format with an AM/PM indicator.

DS1302

Trickle Charge Timekeeping Chip

www.dalsemi.com

X1

X2

GND

SCLK

I/O

RST

8

7

6

5

1

2

3

4

DS1302

8-Pin DIP (300 mil)

X1

X2

GND

SCLK

I/O

RST

8

7

6

5

1

2

3

4

DS1302S 8-Pin SOIC (200 mil)

DS1302Z 8-Pin SOIC (150 mil)

16-Pin SOIC

NC

SCLK

NC

I/O

NC

NC

NC

RST

NC

X1

NC

X2

NC

GND

1

2

3

4

5

6

8

7

16

15

14

13

12

11

9

10