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DS1685/DS1687

3-Volt/5-Volt Real-Time Clock

www.maxim-ic.com

FEATURES

Incorporates industry standard DS1287 PC clock plus

enhanced features:

摟

Y2K-compliant

摟

+3 or +5V operation

摟

64-bit silicon serial number

摟

Power control circuitry supports system power-on

from date/time alarm or key closure

摟

32kHz output for power management

摟

Crystal select bit allows RTC to operate with 6pF

or 12.5pF crystal

摟

SMI Recovery Stack

摟

242 bytes user NV RAM

摟

Auxiliary battery input

摟

RAM clear input

摟

Century register

摟

Date alarm register

摟

Compatible with existing BIOS for original

DS1287 functions

摟

Available as chip (DS1685) or standalone module

with embedded battery and crystal (DS1687)

摟

Timekeeping algorithm includes leap-year

compensation valid up to 2100

X2

X1

PWR

NC

V

CC

SQW

V

BAUX

PIN ASSIGNMENT

PWR

X1

X2

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

GND

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

V

CC

SQW

V

BAUX

RCLR

V

BAT

IRQ

KS

RD

GND

WR

ALE

CS

DS1685 24-Pin DIP

DS1685S 24-Pin SOIC

DS1685E 24-Pin TSSOP

PWR

NC

NC

AD0

AD1

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

V

CC

SQW

V

BAUX

RCLR

NC

IRQ

KS

RD

NC

WR

ALE

CS

AD0

AD1

AD2

AD3

AD4

AD5

NC

5

6

7

8

9

10

4

3

2

1

28

27

26

25

24

23

22

21

20

19

11

12

13

14

15

16

17

18

RCLR

V

BAT

IRQ

KS

RD

GND

WR

AD2

AD3

AD4

AD5

AD6

AD7

GND

DS1685Q 28-Pin PLCC

AD6

NC

AD7

GND

CS

ALE

NC

DS1687 24-Pin Encapsulated

1 of 40

062701

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