DS1678 Real-Time Event Recorder www.maxim-ic.com GENERAL DESCRIPTION FEATURES The DS1678 real-time clock (RTC) event recorder Real-Time Clock/Calendar in Binary-Coded records the time and date of a nonperiodic, Decimal (BCD) Format Counts Seconds, asynchronous event each time the INT pin is Minutes, Hours, Date, Month, Day of the activated. The device records the seconds, minutes, Week, and Year with Leap Year hours, date, day of the week, month, year, and Compensation and is Year 2000 Compliant century when the first event occurs, and starts the 16- Logs Up to 1025 Consecutive Events in Read- bit elapsed time counter (ETC). Subsequent events Only Battery-Backed Memory trigger the recording of the ETC into the event-log User-Programmable Event Trigger can be memory. This allows for up to 1025 events to be Triggered by the Falling Edge, Rising Edge, logged. Events can be logged while the device is or Rising and Falling Edges of the INT Pin operating from either V or V . CC BAT Event Counter Register Provides Data on the Number of Events that Have Been Logged in TYPICAL OPERATING CIRCUIT the Current Event-Logging Mission Programmable RTC Alarm 32-Byte, Battery-Backed, General-Purpose NV RAM 2 I C* Serial Interface Three Resolution Options for Trade-Off Accuracy vs. Maximum Time Between Events -40 C to +85C Industrial Temperature Range Underwriters Laboratory (UL) Recognized ORDERING INFORMATION PART PIN-PACKAGE TOP MARK DS1678 8 Plastic DIP DS1678 DS1678+ 8 Plastic DIP DS1678 DS1678S 8 SO DS1678S DS1678S+ 8 SO DS1678S 8 SO (Tape and PIN CONFIGURATION DS1678S/T&R DS1678S Reel) TOP VIEW 8 SO (Tape and DS1678S+T&R DS1678S Reel) 1 8 X1 V CC All devices are specified over the -40C to +85C operating DS1678 range. 2 7 X2 INT A + anywhere on the top mark denotes a lead(Pb)-free V 3 6 BAT SCL device. 4 5 + Denotes a lead(Pb)-free/RoHS-compliant device. GND SDA 2 2 * I CI Cs fd PDIP (300 mils) 2 AI C 2 SO (208 mils) PI Cd 2 tI Cs ds. 1 of 25 REV: 100405 DS1678 Real-Time Event Recorder ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground..-0.3V to +6.0V Operating Temperature Range (noncondensing)...-40C to +85C Storage Temperature Range.-55C to +125C Soldering Temperature.See IPC/JEDEC J-STD-020 Specification This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect device reliability. RECOMMENDED DC OPERATING CONDITIONS (V = V to V , T = -40C to +85C, unless otherwise noted. Typical values are at nominal CC CC(MIN) CC(MAX) A supply voltage and T = +25 C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power-Supply Voltage V (Note 2) 4.5 5.0 5.5 V CC V + CC Input Logic 1 V (Note 2) 2.2 V IH 0.3 Input Logic 0 V (Note 2) -0.3 +0.8 V IL Pullup Resistor Value V V = 0V (Note 2) 5.5 V PU CC Battery Voltage V (Note 2) 2.6 3.5 V BAT DC ELECTRICAL CHARACTERISTICS (V = V to V , T = -40C to +85C.) CC CC(MIN) CC(MAX) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SDA, SCL SDA output off -1 +1 Input Leakage I A LI INT INT output off 10 Logic 0 Output V 0.4 V OL I = 4mA (SDA, INT) OL Active Supply Current I 1 2 mA CCA 1.216 1.25 x 1.284 Power-Fail Voltage (Note 2) V V = 3.0V V PF BAT x V V x V BAT BAT BAT LOBAT Trip Point LOBAT 1.35 TRP DC ELECTRICAL CHARACTERISTICS (V = 0V, T = -40C to +85C.) (Note 1) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V Current BAT I 300 500 nA OSC (Oscillator On) V Current BAT I 50 150 nA BAT (Oscillator Off) 2 of 25