{"id":7011,"date":"2026-06-23T02:04:36","date_gmt":"2026-06-23T02:04:36","guid":{"rendered":"https:\/\/materialparts.com\/ds1744w-120-2\/"},"modified":"2026-06-23T02:04:36","modified_gmt":"2026-06-23T02:04:36","slug":"ds1744w-120-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/ds1744w-120-2\/","title":{"rendered":"DS1744W-120+"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The DS1744W-120+ from Analog Devices (Maxim Integrated) is a 4Mbit non-volatile SRAM (NV SRAM) with an integrated real-time clock in a 28-pin EDIP package. It combines 512K x 8 SRAM with an embedded lithium energy cell to provide data retention for over 10 years without external power. The W suffix indicates 3.3V operation and the -120 suffix denotes 120ns access time.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n
Memory Capacity<\/td>\n512K x 8 (4Mbit)<\/td>\n<\/tr>\n
Access Time<\/td>\n120ns<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n3.0V ~ 3.6V (3.3V W Version)<\/td>\n<\/tr>\n
\u0628\u0637\u0627\u0631\u064a\u0629 \u0627\u062d\u062a\u064a\u0627\u0637\u064a\u0629<\/td>\nInternal lithium cell, >10 years data retention<\/td>\n<\/tr>\n
Real-Time Clock<\/td>\nIntegrated with leap year compensation<\/td>\n<\/tr>\n
Write Protection<\/td>\nClock register write protect<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nEDIP-28 (28-pin embedded battery DIP)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-40\u00b0C ~ +85\u00b0C<\/td>\n<\/tr>\n<\/table>\n

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    \n
  • Integrated lithium energy cell for non-volatility<\/li>\n
  • Over 10 years of data retention in the absence of external power<\/li>\n
  • Full SRAM compatibility with unlimited write endurance<\/li>\n
  • On-chip real-time clock with century calendar<\/li>\n
  • Automatic leap year adjustment including century correction<\/li>\n
  • Write protect circuitry for clock registers<\/li>\n
  • Lead-free packaging (+ suffix)<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Industrial control parameter storage<\/li>\n
    • Medical instrumentation data logging<\/li>\n
    • Telecom system configuration memory<\/li>\n
    • Embedded systems requiring non-volatile storage<\/li>\n
    • Point-of-sale terminal transaction logging<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The DS1744W-120+ from Analog Devices (Maxim Integrated) is a 4Mbit non-volatile SRAM (NV SRAM) with an integrated real-time clock in a 28-pin EDIP package. It combines 512K x 8 SRAM with an embedded lithium energy cell to provide data retention for over 10 years without external power. The W suffix indicates 3.3V operation […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13],"tags":[],"chip_brand":[165],"class_list":["post-7011","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","chip_brand-adi"],"acf":{"brief_explanation":"4Mbit NV SRAM with RTC, 3.3V, 120ns access, integrated lithium cell for >10 years data retention in EDIP-28","date_code":"","package_case":"EDIP-28 (28-pin embedded battery DIP)","in_stock":12152,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/DS1744.pdf","price":"$18.50 @ 1ku","product_introduction":"The DS1744W is a full-function, non-volatile SRAM with an integrated real-time clock from Analog Devices (formerly Maxim Integrated\/Dallas Semiconductor). It combines 512K x 8 bits of SRAM with an embedded lithium energy cell and a real-time clock\/calendar in a single 28-pin EDIP package. The internal lithium cell maintains data integrity and clock operation for over 10 years without external power. The device is pin-compatible with standard SRAM devices, providing unlimited write endurance and transparent data retention. The W version operates at 3.3V, making it suitable for modern low-voltage systems. The integrated real-time clock provides seconds through century calendar with automatic leap year adjustment.","working_principle":"The DS1744W integrates three primary subsystems: (1) A 512K x 8 CMOS SRAM array provides the main volatile storage with standard SRAM read\/write timing and unlimited write endurance. (2) An embedded lithium energy cell and power-switching circuit continuously monitor VCC. When VCC falls below the internal threshold, the lithium cell automatically takes over power to the SRAM and clock, preventing data loss. The power-switching circuit provides write protection during power transitions to prevent data corruption. (3) The real-time clock\/calendar circuit counts seconds, minutes, hours, day, date, month, and year with automatic leap year compensation including century correction. Clock registers are mapped into the SRAM address space and accessed through specific address sequences.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1-12<\/td>A0-A11<\/td>Address inputs<\/td><\/tr>
      13<\/td>GND<\/td>Ground<\/td><\/tr>
      14-21<\/td>DQ0-DQ7<\/td>Data I\/O<\/td><\/tr>
      22<\/td>CE<\/td>Chip Enable (active low)<\/td><\/tr>
      23<\/td>OE<\/td>Output Enable (active low)<\/td><\/tr>
      24<\/td>WE<\/td>Write Enable (active low)<\/td><\/tr>
      25-28<\/td>A12-A18<\/td>Upper address inputs<\/td><\/tr><\/table>","application_scenarios":"
      • Industrial PLC Parameter Backup<\/b>: Retains critical calibration and configuration data through power cycles with over 10 year battery life<\/li>
      • Medical Instrumentation Logging<\/b>: Maintains patient data and timestamps during transport or unexpected power loss<\/li>
      • Telecom System Configuration<\/b>: Stores network provisioning data and call records with integrated RTC for timestamping<\/li>
      • Embedded OS Boot Parameters<\/b>: Preserves system state and boot configuration across power interruptions<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        DS1744Y-70+<\/td>ADI<\/td>5V version, 70ns access time<\/td><\/tr>
        DS1744Y-100+<\/td>ADI<\/td>5V version, 100ns access time<\/td><\/tr>
        M48T35Y-70MH1F<\/td>ST<\/td>32Kx8 NVRAM with RTC, 5V, 70ns<\/td><\/tr>
        FM24C04B-G<\/td>Infineon<\/td>4Kbit F-RAM, non-volatile, unlimited endurance<\/td><\/tr>
        MB85RS64V<\/td>Fujitsu<\/td>64Kbit F-RAM, SPI, non-volatile<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7011","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=7011"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7011\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7011"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7011"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7011"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7011"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}