Rainbow Electronics DS1500 - Manual

1 of 19 REV: 030603
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GENERAL DESCRIPTION
The DS1500 is a full-function, year 2000-compliant
real-time clock/calendar (RTC) with an alarm,
watchdog timer, power-on reset, battery monitors,
256 bytes of on-board nonvolatile (NV) SRAM, NV
control for backing up an external SRAM, and a
32.768kHz output. User access to all registers within
the DS1500 is accomplished with a byte-wide
interface, as shown in Figure 7. The RTC registers
contain century, year, month, date, day, hours,
minutes, and seconds data in 24-hour binary-coded
decimal (BCD) format. Corrections for day of month
and leap year are made automatically.
APPLICATIONS
Remote Systems
Battery-Backed Systems
Telecom Switches
Office Equipment
Consumer Electronics
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
DS1500YEN -40°C to +85°C 32 TSOP
DS1500WEN -40°C to +85°C 32 TSOP
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
FEATURES
§ BCD-Coded Century, Year, Month, Date, Day,
Hours, Minutes, and Seconds with Automatic
Leap-Year Compensation Valid Up to the Year
2100
§ Programmable Watchdog Timer and RTC Alarm
§ Century Register; Y2K-Compliant RTC
§ Automatic Battery Backup and Write Protection
to External SRAM
§ +5V Operation
§ Precision Power-On Reset
§ Power-Control Circuitry Supports System Power-
On from Date/Day/Time Alarm or Key Closure
§ 256 Bytes User NV RAM
§ Auxiliary Battery Input
§ Accuracy Better than ±1 Minute/Month at +25°C
§ Day-of-Week/Date Alarm Register
§ Battery Voltage-Level Indicator Flags
§ Industrial Temperature Range: -40°C to +85°C
PIN CONFIGURATION
DS1500
Y2K Watchdog RTC with
Nonvolatile Control
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Dallas
Semiconductor
DS1500
TSOP