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M41T93 Datasheet(PDF) 1 Page - STMicroelectronics |
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M41T93 Datasheet(HTML) 1 Page - STMicroelectronics |
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October 2007 Rev 3 1/51 51 M41T93 Serial SPI bus RTC with battery switchover Features ■ Ultra-low battery supply current of 365nA ■ Factory calibrated accuracy ±5PPM guaranteed after 2 reflows (SOX18) – Much better accuracies achievable using built-in programmable analog and digital calibration circuits ■ 2.0V to 5.5V clock operating voltage ■ Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century ■ Automatic switch-over and reset output circuitry (fixed reference) –M41T93S: VCC = 3.0V to 5.5V (2.85V ≤ VRST ≤ 3.00V) –M41T93R: VCC = 2.7V to 5.5V (2.55V ≤ VRST ≤ 2.70V) –M41T93Z: VCC = 2.38V to 5.50V (2.25V ≤ VRST ≤ 2.38V) ■ Compatible with SPI bus serial interface (positive clock SPI modes) ■ Programmable alarm with interrupt function (valid even during battery back-up mode) ■ Optional 2nd programmable alarm available ■ Square wave output (defaults to 32kHz on power-up) ■ RESET (RST) output ■ Watchdog timer ■ Programmable 8-bit counter/timer ■ 7 bytes of battery-backed user SRAM ■ Battery low flag ■ Power-down time stamp (HT bit) ■ Low operating current of 80µA ■ Oscillator stop detection ■ Battery or Super-cap™ back-up ■ Operating temperature of –40°C to +85°C ■ Package options include: – a 16-lead QFN or an 18-lead embedded crystal SOIC ■ RoHS compliance: lead-free components are compliant with the RoHS directive SOX18 (MY, 18-pin, 300mil SOIC QFN16, 4mm x 4mm (QA) 1 18 with embedded crystal) www.st.com |
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