19-6130 Rev 11/11 DS1500 Y2K Watchdog RTC with Nonvolatile Control GENERAL DESCRIPTION FEATURES The DS1500 is a full-function, year 2000-compliant BCD-Coded Century, Year, Month, Date, Day, real-time clock/calendar (RTC) with an alarm, Hours, Minutes, and Seconds with Automatic watchdog timer, power-on reset, battery monitors, Leap-Year Compensation Valid Up to the Year 256 bytes of on-board nonvolatile (NV) SRAM, NV 2100 control for backing up an external SRAM, and a Programmable Watchdog Timer and RTC 32.768kHz output. User access to all registers within Alarm the DS1500 is accomplished with a byte-wide Century Register Y2K-Compliant RTC interface, as shown in Figure 7. The RTC registers contain century, year, month, date, day, hours, Automatic Battery Backup and Write minutes, and seconds data in 24-hour binary-coded Protection to External SRAM decimal (BCD) format. Corrections for day of month +5V or +3.3V Operation and leap year are made automatically. Precision Power-On Reset Power-Control Circuitry Supports System APPLICATIONS Power-On from Date/Day/Time Alarm or Key Remote Systems Closure Battery-Backed Systems 256 Bytes User NV RAM Telecom Switches Office Equipment Auxiliary Battery Input Consumer Electronics Accuracy Better than 1 Minute/Month at +25C Day-of-Week/Date Alarm Register Pin Configuration and Typical Operating Circuit appear at Battery Voltage-Level Indicator Flags end of data sheet. Optional Industrial Temperature Range: -40C to +85C ORDERING INFORMATION PART TEMP RANGE VOLTAGE (V) PIN-PACKAGE 0BTOP MARK* DS1500WE+ 0C to +70C 3.3 32 TSOP DS1500W DS1500WEN+ -40C to +85C 3.3 32 TSOP DS1500WN DS1500YE+ 5.0 32 TSOP DS1500Y 0C to +70C DS1500YEN+ -40C to +85C 5.0 32 TSOP 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. 1 of 20 DS1500 Y2KC Watchdog RTC with Nonvolatile Control ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground..-0.5V to +6.0V Operating Temperature Range (Industrial)...-40C to +85C (Note 1) Operating Temperature Range (Commercial)....-0C to +70C Storage Temperature Range.-55C to +125C Lead Temperature (soldering, 10s).. +300C Soldering Temperature (reflow). +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 (T = Over the Operating Range.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5V (Y) 4.5 5.0 5.5 Power Supply Voltage (Note 2) V V CC 3.3V (W) 3.0 3.3 3.6 V + CC Y 2.2 0.3 Logic 1 Voltage All Inputs (Note 2) V V IH V + CC W 2.0 0.3 Pullup Voltage, IRQ, PWR, and RST Outputs V (Note 2) 5.5 V PU Y -0.3 +0.8 Logic 0 Voltage All Inputs (Note 2) V V IL W -0.3 +0.6 Battery Voltage (Note 2) 2.5 3.0 3.7 V V BAT Y 2.5 3.0 5.3 Auxiliary Battery Voltage (Note 2) V V BAUX W 2.5 3.0 3.7 DC ELECTRICAL CHARACTERISTICS (V < V < V , T = Over the Operating Range.) CCMIN CCI CCMAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Y 15 Active Supply Current (Note 3) I mA CC W 10 Y 5 TTL Standby Current (CS = V ) I mA IH CC1 W 4 CMOS Standby Current Y 5 I mA CC2 (CS V - 0.2V) W 4 CCI Input Leakage Current (Any Input) I -1 +1 IL A Output Leakage Current (Any Output) I -1 +1 A OL Output Logic 1 Voltage (I = -1.0mA) V (Note 2) 2.4 V OUT OH Output Logic 0 Voltage (I = 2.1mA, OUT V (Note 2) 0.4 V OL1 DQ07, CEO I = 5.0mA, IRQ, OUT V (Notes 2, 4) 0.4 V OL2 I = 7.0mA PWR, and RST) OUT Y 2.0 Battery Low, Flag Trip Point (Note 2) V V BLF W 1.9 Y V - CCI Output Voltage (I = 85mA ) (Note 5) V V CCO1 CCO1 W 0.3 Y 4.20 4.50 Power-Fail Voltage (Note 2) V V PF W 2.75 2.97 V BAT, Battery Switchover Voltage V (Notes 2, 6) V V SO BAUX, or V PF 2 of 20