DS1318 - 19-5664 Rev 1 12/10 Parallel-Interface Elapsed Time Counter General Description Features The DS1318 parallel-interface elapsed time counter Byte-Wide Parallel Interface (ETC) is a 44-bit counter that maintains the amount of 44-Bit Binary Counter Provides Timer with 244s time that the device operates from main and/or backup Resolution power or during an external event. The internal Automatic Power-Fail Detect and Switch Circuitry frequency of the counter clock is 4.096kHz, which pro- Selects Power Source from the Primary Power vides a 244s resolution and a maximum count of over 136 years. A built-in power-sense circuit detects power and the Battery, and Write Protects the Internal failures, automatically switches to the backup supply, Registers and controls the timer. If an external event timer is Internal Power-Fail Circuit Allows Timer to desired, the control input EXT can control the counter Provide Primary or Battery Operation Times operation. An open-drain output provides an interrupt, Timer can Alternately Provide an Event Timer of and a square-wave output provides a programmable square wave. The DS1318 is accessed through a byte- Either an Active-High or Active-Low Pulse wide parallel interface, and operates over the industrial Interrupt Output Generated Periodically or When temperature range. the Upper 32 Bits of the Counter Match an Alarm Register Square-Wave Output with 16 Selectable Frequencies from 32.768kHz to 0.5Hz +3.3V Operation Applications Industrial Temperature Range: -40C to +85C Power Meters Underwriters Laboratories (UL) Recognized Industrial Controls Ordering Information Servers PART TEMP RANGE PIN-PACKAGE DS1318E+ -40C to +85C 24 TSSOP DS1318E+T&R -40C to +85C 24 TSSOP +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. Typical Operating Circuit Pin Configuration TOP VIEW V CC RPU X1 + 1 V 24 CC 0.1F X2 2 23 V BAT GND 3 22 IRQ V CC EXT 4 21 SQW SQW IRQ WE A3 5 20 WE EXT A2 6 19 OE OE A1 7 18 CE CPU V DS1318 BAT DS1318 CE A0 8 17 DQ7 EXTERNAL A3A0 X1 DQ0 9 16 DQ6 COUNTER DQDQ7 ENABLE 10 DQ1 15 DQ5 (EVENT TIMER) DQ2 11 14 DQ4 GND X2 GND 12 13 DQ3 TSSOP (4.4mm) Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Parallel-Interface Elapsed Time Counter ABSOLUTE MAXIMUM RATINGS Voltage Range on any Pin Relative to Ground......-0.3V to +6.0V Lead Temperature (soldering, 10s) .................................+260C Operating Temperature Range ...........................-40C to +85C Soldering Temperature (reflow) .......................................+260C Storage Temperature Range .............................-55C to +125C PACKAGE THERMAL CHARACTERISTICS (Note 1) TSSOP (multilayer board) Junction-to-Ambient Thermal Resistance ( ) ............72C/W JA Junction-to-Case Thermal Resistance ( ) .................13C/W JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED DC OPERATING CONDITIONS (V = V to V , T = -40C to +85C, unless otherwise noted.) (Note 2) CC CC(MIN) CC(MAX) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 3) 3.0 3.3 3.6 V CC Battery Voltage V (Note 3) 1.6 3.3 3.7 V BAT 0.7 x V + CC Logic 1 Voltage V (Note 3) V IH V 0.5 CC +0.3 x Logic 0 Voltage V (Note 3) -0.5 V IL V CC DC ELECTRICAL CHARACTERISTICS (V = V to V , T = -40C to +85C, unless otherwise noted.) (Note 2) CC CC(MIN) CC(MAX) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Logic 0 Output Current I 3 mA OL (V = 0.15 x V ) OL CC Logic 1 Output Current I 1 mA OH (V = 0.85 x V ) OH CC SQW, INT Logic 0 Output I 5 mA OLSI (V = 0.15 x V ) OL CC Input Leakage I (Note 4) 1 A LI I/O Leakage I (Note 5) -1 +1 A LO Active Supply Current I (Note 6) 10 mA CCA Standby Current I (Note 7) 100 150 A CCS Battery Input-Leakage Current I 10 100 nA BATLKG Power-Fail Voltage V (Note 3) 2.70 2.97 V PF 2 DS1318