DS1642 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS1642

Nonvolatile Timekeeping RAM

Maxim Integrated 

19-5266; Rev 5/10

DS1642

Nonvolatile Timekeeping RAM

www.maxim-ic.com

FEATURES

 Integrated NV SRAM, Real-Time Clock,

Crystal, Power-Fail Control Circuit, and

Lithium Energy Source

 Standard JEDEC Bytewide 2k x 8 Static

RAM Pinout

 Clock Registers are Accessed Identically to

the Static RAM. These Registers are

Resident in the Eight Top RAM Locations

 Totally Nonvolatile with Over 10 Years of

Operation in the Absence of Power

 Access Times of 85ns and 100ns

 Quartz Accuracy ±1 Minute a Month at

+25°C, Factory Calibrated

 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

 UL Recognized

PIN CONFIGURATION

TOP VIEW

A7 1

24

A6 2 DS1642 23

A5 3

22

A4 4

21

A3 5

20

A2 6

19

A1 7

18

A0 8

17

DQ0 9

16

DQ1 10

15

DQ2 11

14

GND 12

13

VCC

A8

A9

WE

OE

A10

CE

DQ7

DQ6

DQ5

DQ4

DQ3

ENCAPSULATED DIP

ORDERING INFORMATION

VOLTAGE

PART

RANGE TEMP RANGE

(V)

DS1642-85+

5.0

0°C to +70°C

DS1642-100+

5.0

0°C to +70°C

PIN-PACKAGE TOP MARK

24 EDIP (0.720a) DS1642+85

24 EDIP (0.720a) DS1642+100

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

A “+" indicates a lead(Pb)-free product. The top mark will include a “+” symbol on lead-free devices.

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