DS1643-70 Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

DS1643-70

Nonvolatile Timekeeping RAMs

Maxim Integrated 

19-5058; Rev 12/09

DS1643/DS1643P

Nonvolatile Timekeeping RAMs

www.maxim-ic.com

FEATURES

 Integrated NV SRAM, Real-Time Clock,

Crystal, Power-Fail Control Circuit and

Lithium Energy Source

 Clock Registers are Accessed Identically to the

Static RAM. These Registers Reside in the

Eight Top RAM Locations.

 Totally Nonvolatile with Over 10 Years of

Operation in the Absence of Power

 Access Times of 70ns and 100ns

 BCD-Coded Year, Month, Date, Day, Hours,

Minutes, and Seconds with Leap Year

Compensation Valid Up to 2100

 Power-Fail Write Protection Allows for ±10%

VCC Power Supply Tolerance

 Lithium Energy Source is Electrically

Disconnected to Retain Freshness Until Power

is Applied for the First Time

 DS1643 Only (DIP Module)

Standard JEDEC Byte-Wide 8K x 8 RAM

Pinout

 UL Recognized

 DS1643P Only (PowerCap Module Board)

Surface Mountable Package for Direct

Connection to PowerCap Containing

Battery and Crystal

Replaceable Battery (PowerCap)

Power-Fail Output

Pin-for-Pin Compatible with Other Densities of

DS164XP Timekeeping RAM

PIN CONFIGURATIONS

N.C.

TOP VIEW A12

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

GND

1

28

2

3

27

DS1643 26

4

25

5

24

6

23

7

22

8

21

9

20

10

19

11

18

12

17

13

16

14

15

VCC

WE

CE2

A8

A9

A11

OE

A10

CE

DQ7

DQ6

DQ5

DQ4

DQ3

Encapsulated DIP

(700-mil Extended)

N.C.

N.C.

N.C.

PFO

VCC

WE

OE

CE

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

1

34

2

33

3

DS1643P

32

4

31

5

30

6

29

7

28

8

27

9

26

10

25

11

24

12

23

13

22

14

21

15 X1 GND VBAT X2

16

20

19

17

18

N.C.

N.C.

N.C.

N.C.

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

A0

PowerCap Module Board

(Uses DS9034PCX PowerCap)

ORDERING INFORMATION

PART

VOLTAGE RANGE

(V)

TEMP RANGE

PIN-PACKAGE

DS1643-70+

5.0

0°C to +70°C

28 EDIP (0.740)

DS1643-70

5.0

0°C to +70°C

28 EDIP (0.740)

DS1643-100+

5.0

0°C to +70°C

28 EDIP (0.740)

DS1643-100

5.0

0°C to +70°C

28 EDIP (0.740)

DS1643P-70+

5.0

0°C to +70°C

34-PowerCap*

DS1643P-70

5.0

0°C to +70°C

34-PowerCap*

DS1643P-100+

5.0

0°C to +70°C

34-PowerCap*

DS1643P-100

5.0

0°C to +70°C

34-PowerCap*

*DS9034-PCX, DS9034I-PCX, DS9034-PCX+ required (must be ordered separately).

+Denotes a lead(Pb)-free/RoHS-compliant packaget. The top mark will include a “+” symbol on lead-free devices.

TOP MARK

DS1643+70

DS1643-70

DS1643+100

DS1643-100

DS1643P+70

DS1643P-70

DS1643P+100

DS1643P-100

1 of 17

Share Link: