DS1743/DS1743P Y2K-Compliant, Nonvolatile Timekeeping RAMs

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ORDERING INFORMATION

PART

TEMP RANGE

PIN-PACKAGE

VOLTAGE

(V)

TOP MARK**

DS1743-85

0°C to +70°C

28 EDIP Module

5

DS1743-85

DS1743-100

0°C to +70°C

28 EDIP Module

5

DS1743-100

DS1743-100 IND

-40°C to +85°C

28 EDIP Module

5

DS1743-100-IND

DS1743P-85

0°C to +70°C

34 PowerCap*

5

DS1743P-85

DS1743P-100

0°C to +70°C

34 PowerCap*

5

DS1743P-100

DS1743P-100IND

-40°C to +85°C

34 PowerCap*

5

DS1743P-100 IND

DS1743W-120

0°C to +70°C

28 EDIP Module

3.3

DS1743W-120

DS1743W-120 IND

-40°C to +85°C

28 EDIP Module

3.3

DS1743W-120 IND

DS1743W-150

0°C to +70°C

28 EDIP Module

3.3

DS1743W-150

DS1743W-150 IND

-40°C to +85°C

28 EDIP Module

3.3

DS1743W-150 IND

DS1743WP-120

0°C to +70°C

34 PowerCap*

3.3

DS1743WP-120

DS1743WP-120 IND

-40°C to +85°C

34 PowerCap*

3.3

DS1743WP-120 IND

DS1743-85+

0°C to +70°C

28 EDIP Module

5

DS1743-85

DS1743-100+

0°C to +70°C

28 EDIP Module

5

DS1743-100

DS1743-100 IND+

-40°C to +85°C

28 EDIP Module

5

DS1743-100-IND

DS1743P-85+

0°C to +70°C

34 PowerCap*

5

DS1743P-85

DS1743P-100+

0°C to +70°C

34 PowerCap*

5

DS1743P-100

DS1743P-100IND+

-40°C to +85°C

34 PowerCap*

5

DS1743P-100 IND

DS1743W-120+

0°C to +70°C

28 EDIP Module

3.3

DS1743W-120

DS1743W-120 IND+

-40°C to +85°C

28 EDIP Module

3.3

DS1743W-120 IND

DS1743W-150+

0°C to +70°C

28 EDIP Module

3.3

DS1743W-150

DS1743W-150 IND+

-40°C to +85°C

28 EDIP Module

3.3

DS1743W-150 IND

DS1743WP-120+

0°C to +70°C

34 PowerCap*

3.3

DS1743WP-120

DS1743WP-120 IND+

-40°C to +85°C

34 PowerCap*

3.3

DS1743WP-120 IND

DS9034PCX

0°C to +70°C

PowerCap

—

DS9034PC

DS9034I-PCX

-40°C to +85°C

PowerCap IND

—

DS9034PCI

DS9034PCX+

0°C to +70°C

PowerCap

—

DS9034PC

DS9034I-PCX+

-40°C to +85°C

PowerCap IND

—

DS9034PCI

+Denotes a lead-free package.

*DS9034PCX required (must be ordered separately).

**A ‘+’ indicates lead-free. The top mark will include a ‘+’ symbol on lead-free devices.

DESCRIPTION

The DS1743 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) and 8k x 8

nonvolatile static RAM. User access to all registers within the DS1743 is accomplished with a bytewide

interface as shown in Figure 1. The RTC information and control bits reside in the eight uppermost RAM

locations. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in

24-hour binary-coded decimal (BCD) format. Corrections for the day of the month and leap year are made

automatically. The RTC clock registers are double buffered to avoid access of incorrect data that can occur

during clock update cycles. The double-buffered system also prevents time loss as the timekeeping

countdown continues unabated by access to time register data. The DS1743 also contains its own power-

for the system to stabilize. These features prevent loss of data from unpredictable system operation brought