{"id":8446,"date":"2026-06-29T01:17:22","date_gmt":"2026-06-29T01:17:22","guid":{"rendered":"https:\/\/materialparts.com\/mcp79400-i-sn\/"},"modified":"2026-06-29T01:17:22","modified_gmt":"2026-06-29T01:17:22","slug":"mcp79400-i-sn","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/mcp79400-i-sn\/","title":{"rendered":"MCP79400-I\/SN"},"content":{"rendered":"

Productos<\/h2>\n

The MCP79400-I\/SN from Microchip Technology is a battery-backed I2C real-time clock\/calendar (RTCC) with 64 bytes of user SRAM and a 64-bit protected EEPROM unique ID in an 8-pin SOIC package. It features automatic VCC-to-VBAT switchover, power-fail timestamp, dual alarms, programmable clock output, and digital trimming with 1 ppm resolution for precision timekeeping.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
Interface<\/td>\nI2C (up to 400 kHz)<\/td>\n<\/tr>\n
Supply Voltage (VCC)<\/td>\n1.8 V to 5.5 V<\/td>\n<\/tr>\n
Battery Voltage (VBAT)<\/td>\n1.3 V min<\/td>\n<\/tr>\n
Timekeeping Current (VBAT)<\/td>\n<700 nA typ<\/td>\n<\/tr>\n
Dynamic Current (VCC)<\/td>\n<5 \u00b5A typ<\/td>\n<\/tr>\n
User SRAM<\/td>\n64 bytes (battery-backed)<\/td>\n<\/tr>\n
Unique ID<\/td>\n64-bit (EEPROM, user\/factory programmable)<\/td>\n<\/tr>\n
Trimming Resolution<\/td>\n1 ppm<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n
Paquete<\/td>\nSOIC-8 (4.9 \u00d7 3.9 \u00d7 1.5 mm)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Automatic VCC to VBAT switchover for seamless backup<\/li>\n
  • Power-fail timestamp logs power interruptions<\/li>\n
  • Dual alarms with single interrupt output<\/li>\n
  • Programmable open-drain output (CLKOUT: 32.768\/8.192\/4.096 kHz, 1 Hz)<\/li>\n
  • On-chip digital trimming with 1 ppm resolution<\/li>\n
  • 64-bit protected EEPROM for unique ID or MAC address<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Embedded system timekeeping<\/li>\n
    • IoT device power management<\/li>\n
    • Data logging with timestamps<\/li>\n
    • Industrial control systems<\/li>\n
    • Automotive event recording<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MCP79400-I\/SN from Microchip Technology is a battery-backed I2C real-time clock\/calendar (RTCC) with 64 bytes of user SRAM and a 64-bit protected EEPROM unique ID in an 8-pin SOIC package. It features automatic VCC-to-VBAT switchover, power-fail timestamp, dual alarms, programmable clock output, and digital trimming with 1 ppm resolution for precision timekeeping. Key […]<\/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":[13,20],"tags":[],"chip_brand":[134],"class_list":["post-8446","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-microchip"],"acf":{"brief_explanation":"I2C RTCC with 64B SRAM, 64-bit unique ID, VBAT backup, 1ppm trim, SOIC-8","date_code":"","package_case":"SOIC-8 (4.9 \u00d7 3.9 \u00d7 1.5 mm)","in_stock":6350,"datasheet":"https:\/\/ww1.microchip.com\/downloads\/en\/DeviceDoc\/20005009F.pdf","price":"$0.75 @ 100+","product_introduction":"The Microchip MCP79400-I\/SN is a highly integrated I2C real-time clock\/calendar that combines precision timekeeping with memory and advanced features typically found in higher-priced devices. It operates from 1.8 V to 5.5 V on VCC and as low as 1.3 V on VBAT, with automatic switchover ensuring uninterrupted timekeeping during power failures. The on-chip digital trimming circuit provides 1 ppm resolution for crystal accuracy compensation. A 64-bit protected EEPROM space stores a unique ID or MAC address programmable at the factory or by the end user. Dual alarms with a single interrupt output support wake-up and timing functions, while the programmable clock output offers four selectable frequencies.","working_principle":"The MCP79400 uses a 32.768 kHz crystal oscillator as its time base, with time tracked in seconds, minutes, hours, days, day-of-week, months, and years including leap year correction to 2399. Communication occurs via the I2C bus at up to 400 kHz. The power management circuit continuously monitors VCC and automatically switches to VBAT when VCC drops below threshold, logging the power-fail event with a timestamp. The digital trimming circuit adjusts the oscillator frequency in 1 ppm steps by adding or omitting clock cycles, compensating for crystal tolerance and temperature drift. The 64-byte SRAM retains data under battery backup, while the 64-bit EEPROM unique ID is one-time programmable with 1 million erase\/write cycles endurance.","pin_description":"
      Pin<\/th>Name<\/th>Description<\/th><\/tr>
      1<\/td>X1<\/td>Crystal Oscillator Input (32.768 kHz)<\/td><\/tr>
      2<\/td>X2<\/td>Crystal Oscillator Output<\/td><\/tr>
      3<\/td>VBAT<\/td>Battery Backup Supply Input<\/td><\/tr>
      4<\/td>VSS<\/td>Ground<\/td><\/tr>
      5<\/td>SDA<\/td>I2C Serial Data (Open-Drain)<\/td><\/tr>
      6<\/td>SCL<\/td>I2C Serial Clock Input<\/td><\/tr>
      7<\/td>MFP<\/td>Multi-Function Output (Alarm\/CLKOUT, Open-Drain)<\/td><\/tr>
      8<\/td>VCC<\/td>Primary Supply Voltage (1.8-5.5 V)<\/td><\/tr><\/table>","application_scenarios":"
      • Embedded Timekeeping<\/b>: Precision RTC for microcontroller-based systems with 1 ppm trimming ensuring less than 86 ms\/day drift<\/li>
      • IoT Power Management<\/b>: Low-power timekeeping with <700 nA battery current enabling years of operation on coin cell<\/li>
      • Data Logging<\/b>: Power-fail timestamp and battery-backed SRAM preserve critical data during unexpected outages<\/li>
      • Industrial Control<\/b>: Scheduled maintenance alerts via dual alarm interrupt in PLC and SCADA systems<\/li>
      • Automotive Event Recording<\/b>: Unique 64-bit ID for device authentication in fleet management and telematics<\/li><\/ul>","alternative_models":"
        Model<\/th>Brand<\/th>SRAM<\/th>Unique ID<\/th>VBAT (nA)<\/th><\/tr>
        MCP79401-I\/SN<\/td>Microchip<\/td>64B<\/td>128-bit<\/td>700<\/td><\/tr>
        MCP79402-I\/SN<\/td>Microchip<\/td>64B<\/td>128-bit<\/td>700<\/td><\/tr>
        DS3231SN<\/td>Maxim<\/td>None<\/td>No<\/td>880<\/td><\/tr>
        PCF8563BS<\/td>NXP<\/td>None<\/td>No<\/td>250<\/td><\/tr>
        RV-3028-C7<\/td>Micro Crystal<\/td>None<\/td>No<\/td>40<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/8446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=8446"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/8446\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=8446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=8446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=8446"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=8446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}