{"id":5729,"date":"2026-06-11T04:13:36","date_gmt":"2026-06-11T04:13:36","guid":{"rendered":"https:\/\/materialparts.com\/74hct574d\/"},"modified":"2026-06-12T03:07:34","modified_gmt":"2026-06-12T03:07:34","slug":"74hct574d","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/74hct574d\/","title":{"rendered":"74HCT574D"},"content":{"rendered":"

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

The 74HCT574D from NXP is an octal edge-triggered D-type flip-flop with 3-state outputs and HCT (TTL-compatible) input levels in SOIC-20 for bus interface latching.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n
\u5305\u88c5<\/td>\nSOIC-20 (12.8×7.5mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
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  • 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 74HCT574D from NXP is an octal edge-triggered D-type flip-flop with 3-state outputs and HCT (TTL-compatible) input levels in SOIC-20 for bus interface latching. Key Specifications Package SOIC-20 (12.8×7.5mm) 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],"tags":[],"chip_brand":[168],"class_list":["post-5729","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","chip_brand-nxp"],"acf":{"brief_explanation":"Octal D-type flip-flop, 3-state, HCT, SOIC-20","date_code":"","package_case":"SOIC-20 (12.8x7.5mm)","in_stock":3187,"datasheet":"https:\/\/www.nxp.com\/products\/logic\/flip-flops\/","price":"$0.30 @ 1ku","product_introduction":"The 74HCT574D from NXP is an octal edge-triggered D-type flip-flop with 3-state outputs and HCT (TTL-compatible) input levels in SOIC-20 for bus interface latching.","working_principle":"The 74HCT574D is an octal D-type edge-triggered flip-flop with 3-state outputs from Nexperia\/NXP in SOIC-20, part of the 74HCT (High-Speed CMOS with TTL-compatible inputs) family. On each rising edge of CLK, the 8 bits present on D0-D7 are latched into the internal registers and appear on Q0-Q7. The OE (Output Enable) pin controls the output state: when OE is LOW, the Q0-Q7 outputs are active (driving HIGH or LOW); when OE is HIGH, all outputs are in the high-impedance (high-Z) state. This 3-state capability allows multiple 74HCT574 devices to share a common data bus, with only one device enabled at a time. The HCT variant has TTL-compatible input thresholds (VIH = 2.0V, VIL = 0.8V at 4.5V supply), allowing it to receive signals from 5V TTL logic while being powered at 5V. The HC variant has CMOS thresholds (approximately 50% of VCC). The maximum clock frequency is 74MHz at 5V, and propagation delay from CLK to Q is 12ns. The device is commonly used for: (1) Address\/data bus latching in microprocessor systems; (2) Output port expansion - writing data to the flip-flop via CLK and keeping it on the outputs; (3) Bus buffering - isolating a high-impedance bus from a driving source. The 574 variant has non-inverting outputs (vs 564 which inverts) and edge-triggered (vs 373 which is transparent latch). The -D suffix specifies SOIC-20.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>OE<\/td>Input<\/td>Output enable (active LOW, HIGH=high-impedance outputs)<\/td><\/tr>
      2-9<\/td>D0-D7<\/td>Input<\/td>Data inputs (latched on CLK rising edge)<\/td><\/tr>
      10<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      11<\/td>CLK<\/td>Input<\/td>Clock input (rising edge latches D0-D7 to Q0-Q7)<\/td><\/tr>
      12-19<\/td>Q7-Q0<\/td>Output<\/td>Data outputs (3-state, controlled by OE)<\/td><\/tr>
      20<\/td>VCC<\/td>Power<\/td>Supply (4.5-5.5V, HCT requires 5V system)<\/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>
      NXP<\/td>74HCT574D<\/td>SOIC-20<\/td>Same device, NXP brand<\/td><\/tr>
      Texas Instruments<\/td>SN74HCT574N<\/td>DIP-20<\/td>Same function, DIP package<\/td><\/tr>
      onsemi<\/td>MC74HCT574ADWG<\/td>SOIC-20<\/td>Same function, onsemi brand<\/td><\/tr>
      Texas Instruments<\/td>SN74HC574APWR<\/td>TSSOP-20<\/td>HC version, 2.0-6.0V supply<\/td><\/tr>
      NXP<\/td>74LVC574APW<\/td>TSSOP-20<\/td>LVC version, 1.65-3.6V supply<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5729","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=5729"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5729\/revisions"}],"predecessor-version":[{"id":6080,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5729\/revisions\/6080"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5729"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5729"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5729"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5729"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}