DS1501/DS1511 Y2K-Compliant Watchdog Real-Time Clocks GENERAL DESCRIPTION FEATURES BCD-Coded Century, Year, Month, Date, Day, The DS1501/DS1511 are f-ulfuncl tion, year 2000- Hours, Minutes, and Seconds with Automatic compliant real-time clock/calendars (RTCs) with an Leap-Year Compensation Valid Up to the Year RTC alarm, watchdog timer, poweron - reset, battery 2100 monitors, 256 bytes NV SRAM, and a 32.768kHz output. User access to all registers within the Programmable Watchdog Timer and RTC DS1501/DS1511 is accomplished with a bywteide - Alarm interface, as shown in Figure 8. The RTC registers Century Register Y2K-Compliant RTC contain century, year, month, date, day, hours, +3.3 (W) or +5V (Y) Operation minutes, and seconds data in 24h-our binary-coded Precision Power-On Reset decimal (BCD) format. Corrections for day of month and leap year are made automatically. Power-Control Circuitry Support System Power-On from Date/Day/Time Alarm or Key Closure/Modem-Detect Signal APPLICATIONS 256 Bytes Battery-Backed SRAM Remote Systems Auxiliary Battery Input Battery-Backed Systems Telecom Switches Accuracy of DS1511 Better than 1 Office Equipment Minute/Month at +25C Consumer Electronics 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 Pin Configurations and Typical Operating Circuit appear at Available as Chip (DS1501) or Stand-Alone end of data sheet. Encapsulated DIP Module with Embedded Battery and Crystal (DS1511) Underwriters Laboratories (UL) Recognized ORDERING INFORMATION PART VOLTAGE (V) TEMP RANGE PIN-PACKAGE TOP MARK* DS1501WE+ 3.3 28 TSOP DS1501WE 0 C to +70 C DS1501WEN+ 3.3 28 TSOP -40 C to +85C DS1501WEN DS1501WEN+T&R 3.3 28 TSOP DS1501WEN -40 C to +85C DS1501WE+T&R 3.3 28 TSOP 0 C to +70 C 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. T&R = Tape and reel. 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.maximintegrated.com/errata. 1 of 22 19-6820 Rev 10/13 DS1501/DS1511 Y2KC Watchdog Real-Time Clocks ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground.......-0.5V to +6.0V Operating Temperature Range DS1501..-40C to +85C (Note 1) DS1511....0C to +70C Storage Temperature Range DS1501......-55C to +125C DS1511.....-40C to +70C Lead Temperature (soldering, 10 seconds)............+260C Note: EDIP is hand or wave-soldered only. (Note 2) Soldering Temperature (reflow, SO or TSOP).........................................................................+260C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED DC OPERATING CONDITIONS (DS1511: V = 3.3V or 5V 10%, T = 0C to +70C DS1501: V = 3.3V or 5V 10%, T = -40C to +85C.) CC A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5V (Y) 4.5 5.0 5.5 Power Supply Voltage (Note 3) V V CC 3.3V (W) 3.0 3.3 3.6 Y 2.2 V + 0.3 CC Logic 1 Voltage All Inputs (Note 3) V V IH W 2.0 V + 0.3 CC Pullup Voltage, IRQ, PWR, and V 5.5 V PU RST Outputs (Note 3) Y -0.3 +0.8 Logic 0 Voltage All Inputs (Note 3) V V IL W -0.3 +0.6 Battery Voltage (Note 3) V 2.5 3.0 3.7 V BAT Y 2.5 3.0 5.3 Auxiliary Battery Voltage (Note 3) V V BAUX W 2.5 3.0 3.7 DC ELECTRICAL CHARACTERISTICS (DS1511: V = 3.3V or 5V 10%, T = 0C to +70C DS1501: V = 3.3V or 5V 10%, T = -40C to +85C.) CC A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Y 15 Active Supply Current (Note 4) I mA CC W 10 Y 5 TTL Standby Current (CE = V ) I mA IH CC1 W 4 CMOS Standby Current Y 5 I mA CC2 (CE = V - 0.2V) W 4 CC Input Leakage Current (Any Input) I -1 +1 A IL Output Leakage Current (Any Output) I -1 +1 A OL Output Logic 1 Voltage V (Note 3) 2.4 V OH (I = -1.0mA) OUT Output Logic 0 Voltage (I = 2.1mA, OUT V (Note 3) 0.4 V OL1 DQ07 I = 5.0mA, IRQ, I = OUT OUT V (Notes 3, 5) 0.4 V OL2 7.0mA, PWR and RST) Y 2.0 Battery Low, Flag Trip Point (Note 2) V V BLF W 1.9 Y 4.20 4.50 Power-Fail Voltage (Note 2) V V PF W 2.75 2.97 2 of 22