Maxim Integrated Semiconductor Electronic Components Datasheet

DS1243Y Datasheet

64K NV SRAM

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19-6076; Rev 11/11

DS1243Y

64K NV SRAM with Phantom Clock

FEATURES

 Real-Time Clock Keeps Track of Hundredths

of Seconds, Seconds, Minutes, Hours, Days,

Date of the Month, Months, and Years

 8K x 8 NV SRAM Directly Replaces

Volatile Static RAM or EEPROM

 Embedded Lithium Energy Cell Maintains

Calendar Operation and Retains RAM Data

 Watch Function is Transparent to RAM

Operation

 Automatic Leap Year Compensation Valid

Up to 2100

 Lithium Energy Source is Electrically

Disconnected to Retain Freshness Until

Power is Applied for the First Time

 Standard 28-Pin JEDEC Pinout

 Full ±10% Operating Range

 Accuracy is Better than ±1 Minute/Month at

+25°C

 Over 10 Years of Data Retention in the

Absence of Power

 Available in 120ns Access Time

 Underwriters Laboratories (UL) Recognized

(www.maxim-ic.com/qa/info/ul)

PIN CONFIGURATION

TOP VIEW

RST

A12

DQ0

DQ1

DQ2

GND

1 28

DS1243Y

4 25

5 24

6 23

7 22

8 21

9 20

10 19

11 18

12 17

13 16

14 15

VCC

N.C.

A11

A10

DQ7

DQ6

DQ5

DQ4

DQ3

Encapsulated Package

(720-Mil Extended)

ORDERING INFORMATION

PART

TEMP RANGE PIN-PACKAGE

DS1243Y-120+ 0°C to +70°C 28 EDIP (0.720a)

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

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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1243Y Datasheet

64K NV SRAM

No Preview Available !

PIN DESCRIPTION

PIN NAME

FUNCTION

RST

Active-Low Reset Input. This pin has an internal pullup resistor

connected to VCC.

2 A12

3 A7

4 A6

5 A5

6 A4

7 A3

8 A2 Address Inputs

9 A1

10 A0

23 A11

21 A10

24 A9

25 A8

11 DQ0

12 DQ1

13 DQ2

DQ3

DQ4

Data In/Data Out

17 DQ5

18 DQ6

19 DQ7

20 CE Active-Low Chip-Enable Input

22 OE Active-Low Output-Enable Input

26 N.C. No Connection

27 WE Active-Low Write-Enable Input

28 VCC Power-Supply Input

14 GND Ground

DS1243Y

DESCRIPTION

The DS1243Y 64K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 8192

words by 8 bits) with a built-in real time clock. The DS1243Y has a self-contained lithium energy source

and control circuitry, which constantly monitors VCC for an out-of-tolerance condition. When such a

condition occurs, the lithium energy source is automatically switched on and write protection is

unconditionally enabled to prevent corrupted data in both the memory and real time clock. The Phantom

Clock provides timekeeping information including hundredths of seconds, seconds, minutes, hours, day,

date, month, and year information. The date at the end of the month is automatically adjusted for months

with fewer than 31 days, including correction for leap years. The Phantom Clock operates in either

24-hour or 12-hour format with an AM/PM indicator.

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DS1243Y Datasheet

64K NV SRAM

DS1243Y Datasheet

64K NV SRAM

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