DS1742W-120 查看數據表（PDF） - Maxim Integrated

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DS1742W-120

Y2KC Nonvolatile Timekeeping RAM

Maxim Integrated 

DS1742

Y2KC Nonvolatile Timekeeping RAM

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 are

Resident 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

Up to the year 2100

 Battery Voltage Level Indicator Flag

 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

 Standard JEDEC Bytewide 2k x 8 Static

RAM Pinout

 Quartz Accuracy ±1 Minute a Month at

+25°C, Factory Calibrated

 Underwriters Laboratories (UL) Recognized

PIN CONFIGURATION

TOP VIEW

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

GND

1

24

2

3

DS1742

23

22

4

21

5

20

6

19

7

18

8

17

9

16

10

15

11

14

12

13

VCC

A8

A9

WE

OE

A10

CE

DQ7

DQ6

DQ5

DQ4

DQ3

ENCAPSULATED DIP

ORDERING INFORMATION

PART

VOLTAGE (V)

DS1742-85+

5.0

DS1742-100+

5.0

DS1742-100IND+

5.0

DS1742W-120+

3.3

DS1742W-150+

3.3

+Denotes a lead(Pb)-free/RoHS-compliant device.

**The top mark will include a “+” on lead(Pb)-free devices.

TEMP RANGE

0°C to +70°C

0°C to +70°C

-40°C to +85°C

0°C to +70°C

0°C to +70°C

PIN-PACKAGE

24 EDIP (0.740a)

24 EDIP (0.740a)

24 EDIP (0.740a)

24 EDIP (0.740a)

24 EDIP (0.740a)

TOP MARK**

DS1742-85+

DS1742-100+

DS1742-100IND+

DS1742W-120+

DS1742W-150+

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19-6715; Rev 6/13

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