{"id":7928,"date":"2026-06-28T05:53:55","date_gmt":"2026-06-28T05:53:55","guid":{"rendered":"https:\/\/materialparts.com\/max232cpe\/"},"modified":"2026-06-28T11:45:54","modified_gmt":"2026-06-28T11:45:54","slug":"max232cpe","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/max232cpe\/","title":{"rendered":"MAX232CPE"},"content":{"rendered":"

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

The MAX232CPE from Analog Devices (formerly Maxim Integrated) is a dual RS-232 driver\/receiver that converts TTL\/CMOS logic levels to RS-232 voltage levels from a single 5V supply using an integrated charge pump, requiring only four external 1\u00b5F capacitors in a PDIP-16 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Drivers \/ Receivers<\/td>\n2 \/ 2<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n4.5V to 5.5V (single 5V)<\/td>\n<\/tr>\n
Supply Current<\/td>\n8mA typical<\/td>\n<\/tr>\n
\u6570\u636e\u901f\u7387<\/td>\nUp to 120kbit\/s<\/td>\n<\/tr>\n
Driver Output Swing<\/td>\n\u00b18V typical loaded (\u00b15V min per EIA-232)<\/td>\n<\/tr>\n
Receiver Input Threshold<\/td>\n0.8V (LOW), 2.4V (HIGH)<\/td>\n<\/tr>\n
Receiver Hysteresis<\/td>\n0.5V typical<\/td>\n<\/tr>\n
Receiver Input Range<\/td>\n\u00b130V<\/td>\n<\/tr>\n
Driver Slew Rate<\/td>\n24V\/\u00b5s unloaded, 10V\/\u00b5s loaded<\/td>\n<\/tr>\n
ESD Protection<\/td>\n2000V HBM (upgrade to MAX202 for 15kV)<\/td>\n<\/tr>\n
Charge Pump Capacitors<\/td>\n4 \u00d7 1\u00b5F (external)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n0\u00b0C to +70\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nPDIP-16 (7.62mm width)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Meets TIA\/EIA-232-F and ITU V.28 specifications<\/li>\n
  • Operates from single 5V supply<\/li>\n
  • Integrated dual charge pump generates \u00b110V<\/li>\n
  • Requires only four 1\u00b5F external capacitors<\/li>\n
  • Two drivers and two receivers<\/li>\n
  • \u00b130V receiver input range<\/li>\n
  • Low supply current: 8mA typical<\/li>\n
  • Internal pull-up resistors on driver inputs<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • UART-to-RS-232 level conversion<\/li>\n
    • PC serial port interfaces<\/li>\n
    • Embedded system serial communication<\/li>\n
    • Modem and terminal interfaces<\/li>\n
    • Battery-powered RS-232 systems<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MAX232CPE from Analog Devices (formerly Maxim Integrated) is a dual RS-232 driver\/receiver that converts TTL\/CMOS logic levels to RS-232 voltage levels from a single 5V supply using an integrated charge pump, requiring only four external 1\u00b5F capacitors in a PDIP-16 package. Key Specifications Drivers \/ Receivers 2 \/ 2 Supply Voltage 4.5V […]<\/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":[13,22],"tags":[],"chip_brand":[138],"class_list":["post-7928","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-video-ics","chip_brand-ti"],"acf":{"brief_explanation":"Dual RS-232 driver\/receiver, 5V, charge pump, 120kbps, PDIP-16","date_code":"","package_case":"PDIP-16 (7.62mm width, 2.54mm pitch, through-hole)","in_stock":8000,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/MAX220-MAX249.pdf","price":"$0.85 @ 1ku","product_introduction":"The MAX232CPE from Analog Devices (formerly Maxim Integrated) is the industry-standard dual RS-232 driver\/receiver that converts between TTL\/CMOS logic levels (0-5V) and RS-232 voltage levels (\u00b15V to \u00b115V) using only a single 5V power supply. An internal dual charge pump generates approximately +10V and -10V from the 5V input using four external 1\u00b5F capacitors, eliminating the need for external \u00b112V supplies. Each device contains two drivers that invert TTL inputs to RS-232 outputs, and two receivers that invert RS-232 inputs to TTL outputs. The drivers guarantee \u00b15V minimum output swing under worst-case conditions (3k\u03a9 load, 4.5V VCC), meeting TIA\/EIA-232-F requirements. The receivers have 0.5V hysteresis for noise immunity and accept input voltages up to \u00b130V. The CPE suffix denotes the commercial temperature range (0\u00b0C to +70\u00b0C) in a PDIP-16 through-hole package. For lower-voltage applications, the MAX3232 operates from 3.0V to 5.5V.","working_principle":"The MAX232CPE uses a dual charge-pump voltage converter to generate the \u00b110V rails needed for RS-232 driver outputs from a single 5V supply. The first charge pump uses capacitor C1 to double the 5V input to approximately +10V, stored on C3 at the V+ pin. The second charge pump uses capacitor C2 to invert the +10V to approximately -10V, stored on C4 at the V- pin. These generated voltages power the RS-232 driver output stages. Each driver is an inverting level shifter: a TTL LOW input (0V) produces an RS-232 HIGH output (+8V typical), and a TTL HIGH input (5V) produces an RS-232 LOW output (-8V typical). The inversion is by design\u2014RS-232 defines a logic 1 (mark) as -3V to -15V and a logic 0 (space) as +3V to +15V, which is the opposite polarity of TTL. Each receiver inverts the RS-232 signal back to TTL levels: an RS-232 input above +2.4V produces a TTL LOW output, and an input below +0.8V produces a TTL HIGH output. The 0.5V hysteresis between these thresholds prevents oscillation on slow or noisy input edges. Internal 400k\u03a9 pull-up resistors on the driver inputs ensure that unused drivers output an RS-232 LOW (mark) state, which is the idle condition for serial communication.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>C1+<\/td>Capacitor<\/td>Charge pump capacitor C1 positive terminal<\/td><\/tr>\n
      2<\/td>V+<\/td>Power<\/td>+10V generated output (charge pump)<\/td><\/tr>\n
      3<\/td>C1-<\/td>Capacitor<\/td>Charge pump capacitor C1 negative terminal<\/td><\/tr>\n
      4<\/td>C2+<\/td>Capacitor<\/td>Charge pump capacitor C2 positive terminal<\/td><\/tr>\n
      5<\/td>C2-<\/td>Capacitor<\/td>Charge pump capacitor C2 negative terminal<\/td><\/tr>\n
      6<\/td>V-<\/td>Power<\/td>-10V generated output (charge pump)<\/td><\/tr>\n
      7<\/td>T2OUT<\/td>Output<\/td>Driver 2 RS-232 output<\/td><\/tr>\n
      8<\/td>R2IN<\/td>Input<\/td>Receiver 2 RS-232 input<\/td><\/tr>\n
      9<\/td>R2OUT<\/td>Output<\/td>Receiver 2 TTL output<\/td><\/tr>\n
      10<\/td>T2IN<\/td>Input<\/td>Driver 2 TTL input<\/td><\/tr>\n
      11<\/td>T1IN<\/td>Input<\/td>Driver 1 TTL input<\/td><\/tr>\n
      12<\/td>R1OUT<\/td>Output<\/td>Receiver 1 TTL output<\/td><\/tr>\n
      13<\/td>R1IN<\/td>Input<\/td>Receiver 1 RS-232 input<\/td><\/tr>\n
      14<\/td>T1OUT<\/td>Output<\/td>Driver 1 RS-232 output<\/td><\/tr>\n
      15<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      16<\/td>VCC<\/td>Power<\/td>+5V supply<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • MCU Serial Port:<\/strong> T1IN\/R1OUT connect to MCU UART TX\/RX; T1OUT\/R1IN connect to DB9 connector; 4\u00d71\u00b5F caps for charge pump<\/li>\n
      • PC Interface:<\/strong> MAX232 bridges 5V MCU to PC COM port via RS-232; 120kbps supports standard baud rates up to 115200<\/li>\n
      • 3-Wire Serial:<\/strong> Uses 1 driver (TX) + 1 receiver (RX); remaining driver\/receiver available for RTS\/CTS flow control<\/li>\n
      • Multi-Drop:<\/strong> Multiple MAX232 receivers on one RS-232 line; open RS-232 input defaults to HIGH on TTL output<\/li>\n
      • Battery System:<\/strong> 8mA quiescent from 5V; can power-down MCU serial between transmissions for power savings<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        MAX3232ESE+T<\/td>ADI<\/td>3.3V\/5V dual-supply version with \u00b115kV ESD on RS-232 pins and 1\u00b5A auto-powerdown<\/td>SOIC-16<\/td>250kbps\/3-5.5V<\/td><\/tr>\n
        ST3232EBPR<\/td>ST<\/td>3-5.5V RS-232 transceiver with enhanced ESD and same 16-pin pinout for direct replacement<\/td>TSSOP-16<\/td>250kbps\/3-5.5V<\/td><\/tr>\n
        SP3232EBCN-L\/TR<\/td>Silicon Labs<\/td>3.3V\/5V equivalent with auto-powerdown and \u00b115kV ESD protection on bus pins<\/td>DIP-16<\/td>250kbps\/3-5.5V<\/td><\/tr>\n
        TRS3232EIPWR<\/td>TI<\/td>3-5.5V 2Tx\/2Rs with \u00b115kV HBM ESD and 250kbps data rate in TSSOP-16<\/td>TSSOP-16<\/td>250kbps\/3-5.5V<\/td><\/tr>\n
        MAX3221CAE+T<\/td>ADI<\/td>1Tx\/1Rx single-channel version in SSOP-16 for applications needing only one serial port<\/td>SSOP-16<\/td>1Mbps\/1\u00b5A off<\/td><\/tr>\n<\/table>\n

        MAX232CPE is a 5V dual RS-232 driver\/receiver in DIP-16 with 2Tx\/2Rx and 120kbps data rate requiring four 1\u00b5F charge pump capacitors. MAX3232 operates at 3.3-5.5V with enhanced ESD and higher 250kbps rate. MAX3221 offers single-port 1Mbps with 1\u00b5A auto-powerdown. All are pin-compatible within their respective package families and use external charge pump capacitors for RS-232 voltage generation.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7928","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=7928"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7928\/revisions"}],"predecessor-version":[{"id":8235,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7928\/revisions\/8235"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7928"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7928"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7928"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}