DS14285-DS14287 DALLAS [Dallas Semiconductor], DS14285-DS14287 Datasheet

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DS14285-DS14287

Manufacturer Part Number

DS14285-DS14287

Description

Real Time Clock with NV RAM Control

Manufacturer

DALLAS [Dallas Semiconductor]

Datasheet

1.DS14285-DS14287.pdf (25 pages)

Current page: 1 of 25
Download datasheet (305Kb)

FEATURES

www.dalsemi.com

Direct replacement for IBM AT computer

clock/calendar

Functionally compatible with the

DS1285/DS1287

Available as chip (DS14285, DS14285S, or

DS14285Q) or stand-alone module with

embedded lithium battery and crystal

(DS14287)

Automatic backup supply and write

protection to make external SRAM

nonvolatile

Counts seconds, minutes, hours, days, day of

the week, date, month, and year with leap

year compensation valid up to 2100

Binary or BCD representation of time,

calendar, and alarm

12- or 24-hour clock with AM and PM in

12-hour mode

Daylight Savings Time option

Multiplex bus for pin efficiency

Interfaced with software as 128 RAM

locations

– 14 bytes of clock and control registers

– 114 bytes of general purpose RAM

Programmable square wave output signal

Bus-compatible interrupt signals (

Three interrupts are separately software-

maskable and testable

– Time-of-day alarm once/second to

– Periodic rates from 122 s to 500 ms

– End of clock update cycle

Optional industrial temperature version

available DS14285 DIP, SOIC, and PLCC

once/day

Real Time Clock with NV RAM Control

IRQ

)

1 of 25

PIN ASSIGNMENT

AD4

AD0

AD1

AD2

AD3

AD5

GND

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

NC

V

NC

NC

V

GND

CCO

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

CCO

DS14285Q 28-Pin PLCC

X1

X2

DS14285S 24-Pin SOIC

Encapsulated Package

DS14285 24-Pin DIP

5

6

7

8

9

10

11

DS14287 24-Pin

12

1

2

3

4

5

6

7

8

9

10

11

12

DS14285/DS14287

4

1

2

3

4

5

6

7

8

9

10

11

12

13 14

3

2

15

1

16

28

24

23

22

21

20

19

18

17

16

15

14

13

17

27

18

26

24

23

22

21

20

19

18

17

16

15

14

13

25

24

23

22

21

20

19

CEO

V

SQW

CEI

V

IRQ

RESET

DS

GND

R/W

AS

CS

CC

BAT

RESET

DS

CEI

V

IRQ

GND

R/W

V

SQW

CEO

CEI

NC

IRQ

RESET

DS

NC

R/W

AS

CS

BAT

CC

080400

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