DS1742W-120

DS1742W-120 - Y2KC Nonvolatile Timekeeping RAM

FEATURES

Integrated NV SRAM, real time clock,

crystal, power-fail control circuit and lithium

energy source

Clock registers are accessed identical 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 @ 25°C,

factory calibrated 

DESCRIPTION

The DS1742 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) and 2k x 8

non-volatile static RAM. User access to all registers within the DS1742 is accomplished with a bytewide

interface as shown in Figure 1. The Real Time Clock (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 BCD format. Corrections for the day of the month and leap year

are made automatically.

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REFUNDS & RETURN:

We offer a warranty on all items that we sold. Item will be tested before ship,it will be in good condition,if there are some problems with the item,feel free to contact us.Please Email us to notify a defective item. Unless otherwise specified, this item comes with 30 days warranty from the shipment date.

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