DS17885S5 Dallas Semiconductor, DS17885S5 Datasheet

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DS17885S5

Manufacturer Part Number

DS17885S5

Description

SOP24

Manufacturer

Dallas Semiconductor

Datasheet

1.DS17885S5.pdf (38 pages)

Specifications of DS17885S5

Date_code

04+

Current page: 1 of 38
Download datasheet (404Kb)

www.maxim-ic.com

FEATURES

Incorporates industry standard DS1287 PC clock

plus enhanced features:

§ Y2K compliant

§ +3V or +5V operation

§ SMI recovery stack

§ 64-bit silicon serial number

§ Power-control circuitry supports system

§ 32kHz output on power-up

§ Crystal select bit allows RTC to operate with

§ 114 bytes user NV RAM

§ Auxiliary battery input

§ 8kB additional NV RAM

§ RAM clear input

§ Century register

§ Date alarm register

§ Compatible with existing BIOS for original

§ Available as chip (DS17885) or standalone

§ Timekeeping algorithm includes leap-year

§ Underwriters Laboratory (UL) recognized

TYPICAL OPERATING CIRCUIT

power-on from date/time alarm or key

closure

6pF or 12.5pF crystal

DS1287 functions

module with embedded battery and crystal

(DS17887)

compensation valid up to 2100

1 of 38

PIN ASSIGNMENT

VBAUX

VBAT

RCLR

SQW

PWR

ADO

VCC

VCC

AD1

AD2

IRQ

NC

X1

X2

3V/5V Real-Time Clock

GND

PWR

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

X1

X2

GND

PWR

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

10

11

12

13

14

NC

NC

1

2

3

4

5

6

7

8

9

Encapsulated Package

DS17885E 28-Pin TSOP

DS17885S 24-Pin SO

DS17885 24-Pin DIP

DS17887 24-Pin

DS17885/DS17887

1

2

3

4

5

6

7

8

9

10

11

12

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

24

23

22

21

20

19

18

17

16

15

14

13

VCC

SQW

VBAUX

RCLR

VBAT

IRQ

KS

RD

GND

WR

ALE

CS

VCC

SQW

VBAUX

RCLR

NC

IRQ

KS

RD

NC

WR

ALE

CS

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

050802

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