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070199

FEATURES

§ Two 32–bit counters keep track of real time

and elapsed time

§ Counters keep track of seconds for over 125

years

§ Battery powered counter counts seconds from

than 2.5 volts

§ V

power

§ Clear function resets selected counter to 0

§ Read/Write serial port affords low pin count

§ Maximum current drain of less than 1 µA

§ One byte protocol defines read/write, counter

address and software clear function

§ 8–pin DIP or optional 8–pin SOIC

§ Operating temperature range of –40°C to

+85°C

§ Reduced performance operation down to V

CC

= 2.5V

PIN ASSIGNMENT

PIN DESCRIPTION

RST

- Reset

CLK

- Clock

DQ

- Data Input/Output

GND

- Ground

X1, X2

- Crystal Inputs

- + Battery Input

- +5 Volts

DESCRIPTION

applied and continually count seconds under battery backup power with an additional counter regardless

equipment in which the DS1602 is used. Alternatively, this counter can also be used under software

control to record real time events. Communication to and from the DS1602 takes place via a 3–wire

serial port. A 1-byte protocol selects read/ write functions, counter clear functions and oscillator trim. A

low cost 32.768 kHz crystal attaches directly to the X1 and X2 pins. If battery powered-only operation is

DS1602

8-Pin SOIC (200-mil)

DS1602

8-Pin DIP (300-mil)

DS1602

Elapsed Time Counter

www.dalsemi.com

X1

X2

RST

DQ

CLK

GND

1

2

3

4

8

7

6

5

RST

DQ

CLK

GND

X1

X2

1

2

3

4

8

7

6

5