EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. 2 MAX31342 Low-Current, Real-Time Clock with I C Interface General Description Benefits and Features The MAX31342 low-current, real-time clock (RTC) is a Increases Battery Life time-keeping device that provides an extremely low time- 150nA Timekeeping Current keeping current, permitting longer life from a power sup- Wide Range of External Crystals with C = 6pF and L ply. The MAX31342 supports 6pF high-ESR crystals, ESR up to 100k for Minimal Current Draw which broaden the pool of usable crystals for the devices. Provides Flexible Configurability 2 This device is accessed through an I C serial interface. Programmable Square Wave Output for Clock An integrated power-on reset function ensures determinis- Monitoring tic default register status upon power-up. Saves Board Space Other features include two time-of-day alarms, interrupt Integrated Load Capacitors for Crystal Oscillator outputs, a programmable square-wave output, and a ser- 1mm x 2mm, 8-Bump WLP with 0.5mm Pitch ial bus timeout mechanism. The clock/calendar provides Value Add Features for Ease of Use seconds, minutes, hours, day, date, month, and year infor- +1.6V to +3.6V Operating Voltage Range mation. The date at the end of the month is automatical- Countdown Timer with Repeat Function ly adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in 24-hour Integrated Protection mode. The MAX31342 also includes an input for synchro- Power-On Reset for Default Configuration nization. When a reference clock (e.g., 32kHz, 50Hz/60Hz Lockup-Free Operation with Bus Timeout Power Line, GPS 1PPS) is present at the CLKIN pin and Ordering Information appears at end of data sheet. the enable external clock input bit (ECLK) is set to 1, the MAX31342 RTC is frequency-locked to the external Typical Operating Circuit clock and the clock accuracy is determined by the external V CC source. The device is available in lead(Pb)-free/RoHS-compliant, 8-pin wafer-level package (WLP) 1mm x 2mm package V CC with 0.5mm pitch. The device supports the -40C to +85C SDA X1 extended temperature range. SCL X2 Applications MCU MAX31342 Medical INTA/CLKIN Wearables INTB/CLKOUT Point-of-Sale (POS) Telematics Portable Instruments GND Portable Audio Power Meters 19-100457 Rev 2 4/192 MAX31342 Low-Current, Real-Time Clock with I C Interface Absolute Maximum Ratings Voltage Range on Any Pin Relative to Ground ........ -0.3V to +6V Soldering Temperature ............See the IPC/JEDEC J-STD-020A Operating Temperature Range ............................ -40C to +85C Specification Junction Temperature ...................................................... +150C Storage Temperature Range.............................. -55C to +150C 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. Package Information 8 WLP Package Code W80D1-1 Outline Number 21-100291 Land Pattern Number Refer to Application Note 1891 Thermal Resistance, Four-Layer Board: Junction-to-Ambient ( ) 49C/W JA Junction-to-Case Thermal Resistance ( ) N/A JC For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 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.maximintegrated.com/ thermal-tutorial. www.maximintegrated.com Maxim Integrated 2