The DS1390U-33+T&R from Maxim is a real-time clock with a 33-bit binary counter and trickle charger for backup in TSSOP-16 for time-stamping and scheduling applications.<\/p>\n
| Paquete<\/td>\n | TSSOP-16<\/td>\n<\/tr>\n<\/table>\nCaracter\u00edsticas<\/h2>\nAplicaciones<\/h2>\nProduct Overview The DS1390U-33+T&R from Maxim is a real-time clock with a 33-bit binary counter and trickle charger for backup in TSSOP-16 for time-stamping and scheduling applications. Key Specifications Package TSSOP-16 Features See datasheet for complete specifications Industry-standard package Applications Industrial control Consumer electronics Communication equipment Automotive electronics<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,55],"tags":[],"chip_brand":[259],"class_list":["post-5621","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-transistors","chip_brand-maxim"],"acf":{"brief_explanation":"RTC with trickle charger and 33-bit binary counter, TSSOP-16","date_code":"","package_case":"TSSOP-16","in_stock":7820,"datasheet":"https:\/\/www.analog.com\/en\/products\/ds1390.html","price":"$3.50 @ 1ku","product_introduction":"The DS1390U-33+T&R from Maxim is a real-time clock with a 33-bit binary counter and trickle charger for backup in TSSOP-16 for time-stamping and scheduling applications.","working_principle":"The DS1390U-33+T&R is a real-time clock (RTC) with 33-bit binary counter from Maxim Integrated in TSSOP-16, operating from 1.8-5.5V with SPI interface. Unlike traditional RTCs that count in BCD (seconds\/minutes\/hours), the DS1390 uses a 33-bit binary counter that increments every second from a 32.768kHz crystal, providing a monotonic timestamp that never wraps (2^33 seconds = 272 years). The binary counter simplifies firmware: no need to convert BCD to decimal, and time calculations are simple addition\/subtraction. The device includes: (1) Two alarm registers that compare against the 33-bit counter; (2) Trickle charger (disabled on DS1390, enabled on DS1391) for charging a supercapacitor or rechargeable battery from VCC; (3) RST#\/RST# outputs that assert during power-up or when VCC drops below VBACKUP; (4) SQW output with 1Hz, 4kHz, 8kHz, 16kHz, or 32kHz square wave; (5) 16 bytes of SRAM for storing calibration or configuration data. The SPI interface (mode 0 or 3, up to 4MHz) provides fast register access. The 33-bit counter is read as two consecutive SPI transactions (8 bits + 8 bits + 17 bits = 33 bits). The crystal oscillator draws only 300nA from VBACKUP, extending battery life to 10+ years with a CR2032 coin cell. The -33+T&R suffix specifies 33-bit counter, industrial temperature, tape-and-reel. Applications include: data logging timestamps, power-fail event recording, and long-duration timing.","pin_description":"
|