DS1501 Series

Y2K-Compliant Watchdog Real-Time Clocks

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

Y2K-Compliant Watchdog Real-Time Clocks

Part	Current - Timekeeping (Max)	Voltage - Supply (Maximum)	Voltage - Supply (Minimum)	Voltage - Supply, Battery (Maximum)	Voltage - Supply, Battery (Minimum)	Type	Memory Size	Mounting Type	Operating Temperature (Min)	Operating Temperature (Max)	Time Format	Date Format	Features	Interface	Package Name	Package Width	Package Length
Analog Devices Inc./Maxim Integrated DS1501YSN+T&R	5 mA	5.5 V	4.5 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	-40 °C	85 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-SOIC	7.5 mm	0.295 in
Analog Devices Inc./Maxim Integrated DS1501WSN	4 mA	3.6 V	3 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	-40 °C	85 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-SOIC	7.5 mm	0.295 in
Analog Devices Inc./Maxim Integrated DS1501YE	5 mA	5.5 V	4.5 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	0 °C	70 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-TSOP 28-TSSOP	11.8 mm	0.465 in
Analog Devices Inc./Maxim Integrated DS1501WSN+T&R	4 mA	3.6 V	3 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	-40 °C	85 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-SOIC	7.5 mm	0.295 in
Analog Devices Inc./Maxim Integrated DS1501WS	4 mA	3.6 V	3 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	0 °C	70 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-SOIC	7.5 mm	0.295 in
Analog Devices Inc./Maxim Integrated DS1501YZ+	5 mA	5.5 V	4.5 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	0 °C	70 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-SOIC	7.5 mm	0.295 in
Analog Devices Inc./Maxim Integrated DS1501WS+T&R	4 mA	3.6 V	3 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	0 °C	70 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-SOIC	7.5 mm	0.295 in
Analog Devices Inc./Maxim Integrated DS1501YSN	5 mA	5.5 V	4.5 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	-40 °C	85 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-SOIC	7.5 mm	0.295 in
Analog Devices Inc./Maxim Integrated DS1501WEN+T&R	4 mA	3.6 V	3 V	3.7 V	2.5 V	Clock/Calendar	256 B	Surface Mount	-40 °C	85 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-TSOP 28-TSSOP	11.8 mm	0.465 in
Analog Devices Inc./Maxim Integrated DS1501YN	5 mA	5.5 V	4.5 V	3.7 V	2.5 V	Clock/Calendar	256 B	Through Hole	-40 °C	85 °C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Alarm Leap Year NVSRAM Square Wave Output Watchdog Timer Y2K	Parallel	28-DIP 28-PDIP	15.24 mm	0.6 in

Catalog

Y2K-Compliant Watchdog Real-Time Clocks

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.ApplicationsBattery-Backed SystemsConsumer ElectronicsOffice EquipmentRemote SystemsTelecom Switches