DS1511：Y2K-Compliant Watchdog Real-Time Clocks _ BDTIC a Leading Distributor in China

DS1511：Y2K-Compliant Watchdog Real-Time Clocks

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.

Key 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)

DS1501, DS1511: Typical Operating Circuit

Applications/Uses

Battery-Backed Systems
Consumer Electronics
Office Equipment
Remote Systems
Telecom Switches

DataSheet

title	Download file
DS1501-DS1511 Data Sheet	DS1501-DS1511.pdf
Errata DS1511	1501A6.pdf
Errata DS1511	1501A7.pdf

Parametrics

Part Number	Interface	V_SUPPLY (V)	C_L (pF)	Memory Type	Memory Size (Bytes)	Time of Day Alarms	Functions	Package/Pins	Budgetary Price
Part Number	Interface	V_SUPPLY (V)	C_L (pF)	Memory Type	Memory Size (Bytes)	Time of Day Alarms	Functions	Package/Pins	See Notes
DS1501	Bytewide	3.3 5	6 12.5	NV SRAM	256	1	RTC Watchdog Timekeeper	PDIP(W)/28 SOIC(W)/28 TSOP/28	$4.63 @1k
DS1511	Bytewide	3.3 5	-	NV SRAM	256	1	RTC Watchdog Timekeeper	EDIP/28	$10.38 @1k

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
DS1511W	No Longer Available	DS1511W+	EDIP,;28 pin;625.9 mm²	0°C to +70°C	See data sheet
DS1511W+	Active		EDIP,;28 pin;625.9 mm²	0°C to +70°C	Lead Free
DS1511Y	No Longer Available	DS1511Y+	EDIP,;28 pin;625.9 mm²	0°C to +70°C	See data sheet
DS1511Y+	Active		EDIP,;28 pin;625.9 mm²	0°C to +70°C	Lead Free