DS1486 Datasheet

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DS1486/DS1486P

RAMified Watchdog Timekeeper

www.maxim-ic.com

FEATURES

搂

搂

搂

搂

搂

搂

搂

搂

128 kbytes of user NV RAM

Integrated NV SRAM, real-time clock,

crystal, power-fail control circuit and lithium

energy source

Totally nonvolatile with over 10 years of

operation in the absence of power

Watchdog timer restarts an out-of-control

processor

Alarm function schedules real-time related

activities such as system wakeup

Programmable interrupts and square wave

output

All registers are individually addressable via

the address and data bus

Interrupt signals active in power-down mode

PIN ASSIGNMENT

INTB (INTB)

A16

A14

A12

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

V

CC

A15

INTA/SQW

WE

A13

A8

A9

A11

OE

A10

CE

DQ7

DQ6

DQ5

DQ4

DQ3

ORDERING INFORMATION

DS1486

XXX

(32鈥損in DIP module)

鈥?50

150 ns access

鈥?20

120 ns access

34-pin PowerCap Module Board

鈥?50

150 ns access

鈥?20

120 ns access

DS1486 128k x 8

32-Pin Encapsulated Package

*DS1486P

XXX

*DS9034PCX

PowerCap Required

(must be ordered separately)

PIN DESCRIPTION

鈥?Interrupt Output A (open drain)

INTB

(INTB) 鈥?Interrupt Output B (open drain)

A0鈥揂16

鈥?Address Inputs

DQ0鈥揇Q7

鈥?Data Input/Output

CE

鈥?Chip Enable

OE

鈥?Output Enable

WE

鈥?Write Enable

V

CC

鈥?+5 Volts

GND

鈥?Ground

SQW

鈥?Square Wave Output

NC

鈥?No Connection

X1, X2

鈥?Crystal Connection

V

BAT

鈥?Battery Connection

INTB

INTB (INTB)

A15

A16

PFO

V

CC

WE

OE

CE

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

X1

GND V

BAT

X2

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

INTA

SQW

A14

A13

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

A0

34-Pin PowerCap Module Board

(Uses DS9034PCX PowerCap)

1 of 17

072401

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