DS1501_09 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – Y2K-Compliant Watchdog Real-Time Clocks

DS1501/DS1511
Y2K-Compliant Watchdog Real-Time Clocks
GENERAL DESCRIPTION
The DS1501/DS1511 are full-function, year 2000-
compliant real-time clock/calendars (RTCs) with an
RTC alarm, watchdog timer, power-on reset, battery
monitors, 256 bytes NV SRAM, and a 32.768kHz
output. User access to all registers within the
DS1501/DS1511 is accomplished with a byte-wide
interface, as shown in Figure 8. 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 Configurations and Typical Operating Circuit appear at
end of data sheet.
ORDERING INFORMATION
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
+3.3 (W) or +5V (Y) Operation
Precision Power-On Reset
Power-Control Circuitry Support System
Power-On from Date/Day/Time Alarm or Key
Closure/Modem-Detect Signal
256 Bytes Battery-Backed SRAM
Auxiliary Battery Input
Accuracy of DS1511 Better than ±1
Minute/Month at +25°C
Day-of-Week/Date Alarm Register
Crystal Select Bit Allow RTC to Operate with
6pF or 12.6pF Crystal (DS1501)
Battery Voltage-Level Indicator Flags
Available as Chip (DS1501) or Stand-Alone
Encapsulated DIP Module with Embedded
Battery and Crystal (DS1511)
Underwriters Laboratories (UL) Recognized
PART
DS1501W+
DS1501WE+
DS1501WEN+
DS1501WEN+T&R
DS1501WE+T&R
VOLTAGE (V)
3.3
3.3
3.3
3.3
3.3
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
PIN-PACKAGE
28 DIP (0.600)
28 TSOP
28 TSOP
28 TSOP/Tape & Reel
28 TSOP/Tape & Reel
TOP MARK*
DS1501W
DS1501WE
DS1501WEN
DS1501WEN
DS1501WE
+Denotes a lead(Pb)-free/RoHS-compliant package.
*A “+” anywhere on the top mark denotes a lead(Pb)-free device. An N or IND denotes an industrial temperature device.
Ordering Information continued at end of data sheet.
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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REV: 010909