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DS17485/DS17487

3V/5V Real-Time Clock

www.maxim-ic.com

FEATURES

Incorporates industry standard DS1287 PC clock

plus enhanced features:

摟

Y2K compliant

摟

+3V or +5V operation

摟

SMI recovery stack

摟

64-bit silicon serial number

摟

Power-control circuitry supports system

power-on from date/time alarm or key

closure

摟

32kHz output on power-up

摟

Crystal select bit allows RTC to operate with

6pF or 12.5pF crystal

摟

114 bytes user NV RAM

摟

Auxiliary battery input

摟

4kB additional NV RAM

摟

RAM clear input

摟

Century register

摟

Date alarm register

摟

Compatible with existing BIOS for original

DS1287 functions

摟

Available as chip (DS17485) or standalone

module with embedded battery and crystal

(DS17487)

摟

Timekeeping algorithm includes leap-year

compensation valid up to 2100

摟

Underwriters Laboratory (UL) recognized

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

DS17485 24-Pin DIP

DS17485S 24-Pin SO

PWR

NC

NC

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

NC

IRQ

KS

RD

NC

WR

ALE

CS

DS17487 24-Pin

Encapsulated Package

TYPICAL OPERATING CIRCUIT

IRQ

V

BAT

RCLR

V

BAUX

SQW

V

CC

V

CC

PWR

X1

X2

NC

ADO

AD1

AD2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

KS

RD

GND

WR

ALE

CS

GND

GND

AD7

AD6

NC

AD5

AD4

AD3

DS17485E 28-Pin TSOP

1 of 38

050802

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