DS1500_11 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Y2K Watchdog RTC with Nonvolatile Control

19-6130; Rev 11/11
DS1500
Y2K Watchdog RTC with Nonvolatile Control
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
Pin Configuration and Typical Operating Circuit appear 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 or +3.3V 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
 Optional Industrial Temperature Range: -40°C
to +85°C
ORDERING INFORMATION
PART
TEMP RANGE
VOLTAGE (V) PIN-PACKAGE
TOP 0B MARK*
DS1500WE+
DS1500WEN+
DS1500YE+
DS1500YEN+
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
3.3
32 TSOP
3.3
32 TSOP
5.0
32 TSOP
5.0
32 TSOP
DS1500W
DS1500WN
DS1500Y
DS1500YN
+Denotes a lead(Pb)-free/RoHS-compliant device.
*A “+” anywhere on the top mark indicates a lead(Pb)-free/RoHS-compliant device. An “N” indicates an industrial temperature range device.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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