{"id":5798,"date":"2026-06-11T05:30:18","date_gmt":"2026-06-11T05:30:18","guid":{"rendered":"https:\/\/materialparts.com\/ds1308u-33t\/"},"modified":"2026-06-11T06:59:14","modified_gmt":"2026-06-11T06:59:14","slug":"ds1308u-33t","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ds1308u-33t\/","title":{"rendered":"DS1308U-33+T"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The DS1308U-33+T from Maxim is a real-time clock IC with I2C interface, 32.768kHz crystal oscillator, and battery backup in SOIC-8 for timekeeping applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n
\u5305\u88c5<\/td>\nSOIC-8 (4.9×3.9mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • See datasheet for complete specifications<\/li>\n
  • Industry-standard package<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial control<\/li>\n
    • Consumer electronics<\/li>\n
    • Communication equipment<\/li>\n
    • Power management<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The DS1308U-33+T from Maxim is a real-time clock IC with I2C interface, 32.768kHz crystal oscillator, and battery backup in SOIC-8 for timekeeping applications. Key Specifications Package SOIC-8 (4.9×3.9mm) Features See datasheet for complete specifications Industry-standard package Applications Industrial control Consumer electronics Communication equipment Power management<\/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":[13,42],"tags":[],"chip_brand":[259],"class_list":["post-5798","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","chip_brand-maxim"],"acf":{"brief_explanation":"Real-time clock, I2C, 32.768kHz, SOIC-8","date_code":"","package_case":"SOIC-8 (4.9x3.9mm)","in_stock":8601,"datasheet":"https:\/\/www.maximintegrated.com\/en\/products\/real-time-clock\/DS1308.html","price":"$1.00 @ 1ku","product_introduction":"The DS1308U-33+T from Maxim is a real-time clock IC with I2C interface, 32.768kHz crystal oscillator, and battery backup in SOIC-8 for timekeeping applications.","working_principle":"The DS1308U-33+T is a real-time clock (RTC) from Maxim Integrated in SOIC-8 that tracks seconds, minutes, hours, day, date, month, and year with automatic leap-year compensation up to 2100. The timekeeping core is driven by an external 32.768kHz crystal connected to X1\/X2 pins. The internal oscillator circuit is optimized for 6pF crystal load capacitance, and the oscillator continues running on VBAT when VCC is removed, consuming only 300nA typical. The I2C interface (SDA\/SCL) operates at 400kHz, allowing the host MCU to read\/write time registers. The SQW\/OUT pin provides a programmable square wave output at 1Hz, 4.096kHz, 8.192kHz, or 32.768kHz, useful for periodic interrupts or system tick generation. The -33+T suffix indicates 3.3V operation and tape-and-reel packaging. The power-switch circuit automatically selects VCC when present and falls back to VBAT when VCC drops below VBAT, ensuring uninterrupted timekeeping during power outages.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>X1<\/td>Input<\/td>32.768kHz crystal oscillator input<\/td><\/tr>
      2<\/td>X2<\/td>Output<\/td>32.768kHz crystal oscillator output<\/td><\/tr>
      3<\/td>VBAT<\/td>Power<\/td>Backup battery supply (1.8-5.5V)<\/td><\/tr>
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>SDA<\/td>I\/O<\/td>I2C data (bidirectional)<\/td><\/tr>
      6<\/td>SCL<\/td>Input<\/td>I2C clock<\/td><\/tr>
      7<\/td>SQW\/OUT<\/td>Output<\/td>Square wave output (1Hz\/4kHz\/8kHz\/32kHz)<\/td><\/tr>
      8<\/td>VCC<\/td>Power<\/td>Main supply (1.8-5.5V)<\/td><\/tr><\/table>","application_scenarios":"
    • Industrial control<\/li>
    • Consumer electronics<\/li>
    • Communication equipment<\/li>
    • Power management<\/li>","alternative_models":"
      Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
      Maxim<\/td>DS1307Z+T<\/td>SOIC-8<\/td>5V only version, industry standard<\/td><\/tr>
      NXP<\/td>PCF8563TS<\/td>SOIC-8<\/td>Low-power RTC, 1.0V backup<\/td><\/tr>
      STMicroelectronics<\/td>M41T62Q6F<\/td>SOIC-8<\/td>RTC with SRAM, 1.5V backup<\/td><\/tr>
      Microchip<\/td>MCP7940N-I\/SN<\/td>SOIC-8<\/td>RTC with SRAM and EEPROM<\/td><\/tr>
      Epson<\/td>RX8900CE<\/td>SOP-8<\/td>Ultra-low-power RTC, 0.6uA<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5798","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=5798"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5798\/revisions"}],"predecessor-version":[{"id":5948,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5798\/revisions\/5948"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5798"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}