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REV

: 090407

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

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.

Century Byte Register

Totally Nonvolatile with Over 10 Years of

Operation in the Absence of Power

BCD-Coded Century, Year, Month, Date,

Day, Hours, Minutes, and Seconds with

Automatic Leap Year Compensation Valid

through 2099

Low-Battery-Voltage Level Indicator Flag

Power-Fail Write Protection Allows for ±10%

Lithium Energy Source is Electrically

Disconnected to Retain Freshness Until

Power is Applied for the First Time

DIP Module Only

Standard JEDEC Bytewide 8k x 8 Static

RAM Pinout

PowerCap Module Board Only

Surface-Mountable Package for Direct

Connection to PowerCap Containing

Battery and Crystal

Replaceable Battery (PowerCap)

Power-On Reset Output

Pin-for-Pin Compatible with Other Densities

of DS174XP Timekeeping RAM

Underwriters Laboratories (UL) Recognized

to Prevent Charging of the Internal Lithium

Battery

PIN CONFIGURATIONS

DS1743/DS1743P

Y2K-Compliant, Nonvolatile Timekeeping

RAMs

www.maxim-ic.com

WE

CE2

A8

A9

A11

OE

A10

CE

DQ7

DQ6

DQ5

DQ4

DQ3

1

2

3

4

5

6

7

8

9

10

11

12

13

14

N.C.

A12

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

GND

28

27

26

25

24

23

22

21

20

19

18

17

16

15

28-Pin Encapsulated Package

(28 PIN 740)

DS1743

1

N.C.

2

3

N.C.

N.C.

RST

WE

OE

CE

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

4

5

6

7

8

9

10

11

12

13

14

15

16

17

N.C.

N.C.

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

N.C.

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

A0

34

N.C.

X1

GND

X2

34-Pin PowerCap Module Board

(Uses DS9034PCX PowerCap)

DS1743P

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