The SP3232EEY-L from MaxLinear (formerly Sipex) is a 2-driver\/2-receiver RS-232 transceiver operating from a single +3.0-V to +5.5-V supply. It features an integrated high-efficiency charge pump requiring only four 0.1-\u00b5F external capacitors, true EIA\/TIA-232-F compliance, 120-kbps minimum data rate, and enhanced ESD protection (\u00b115-kV HBM, \u00b18-kV IEC 61000-4-2 contact discharge). The -L suffix denotes the TSSOP-16 package rated for -40\u00b0C to +85\u00b0C. Supply current is 0.3 mA typical at no load. Applications include notebook computers, industrial controllers, and embedded RS-232 interfaces.<\/p>","protected":false},"excerpt":{"rendered":"
The SP3232EEY-L from MaxLinear (formerly Sipex) is a 2-driver\/2-receiver RS-232 transceiver operating from a single +3.0-V to +5.5-V supply. It features an integrated high-efficiency charge pump requiring only four 0.1-\u00b5F external capacitors, true EIA\/TIA-232-F compliance, 120-kbps minimum data rate, and enhanced ESD protection (\u00b115-kV HBM, \u00b18-kV IEC 61000-4-2 contact discharge). The -L suffix denotes the […]<\/p>\n","protected":false},"author":2,"featured_media":2889,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[171],"class_list":["post-2033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-maxlinear"],"acf":{"brief_explanation":"RS-232 2Tx\/2Rx, 3.0-5.5V, 120kbps, charge pump 4x0.1\u00b5F, \u00b115kV ESD HBM, TSSOP-16, -40~85\u00b0C","date_code":"","package_case":"TSSOP-16 (5.0 x 6.4 x 1.1 mm, 0.65mm pitch)","in_stock":15000,"datasheet":"https:\/\/www.maxlinear.com\/ds\/sp3222e_sp3232e.pdf","price":"$0.72 (1K+ pcs)","product_introduction":"The SP3232EEY-L is a true RS-232 transceiver from MaxLinear's SP3232E series, providing 2 drivers and 2 receivers in a single TSSOP-16 package. It is designed for portable and handheld applications requiring RS-232 communication from 3.3-V or 5-V logic supplies.\n\nThe integrated charge pump doubles and inverts the supply voltage to generate the \u00b15.4-V (typical) RS-232 output levels required by EIA\/TIA-232-F, using only four 0.1-\u00b5F external capacitors. This is a significant improvement over older designs requiring 1-\u00b5F capacitors, reducing board area and cost.\n\nThe device meets all EIA\/TIA-232-F specifications with a minimum data rate of 120 kbps under full 3-k\u03a9\/1000-pF load, sufficient for standard serial communication up to 115.2 kbps with margin. The driver output swing exceeds \u00b15.0 V with a 3-k\u03a9 load, ensuring compatibility with all standard RS-232 receivers.\n\nESD protection is a standout feature: \u00b115-kV Human Body Model, \u00b115-kV IEC 61000-4-2 air discharge, and \u00b18-kV IEC 61000-4-2 contact discharge on all RS-232 pins. This eliminates the need for external TVS diodes in most applications, simplifying the BOM.\n\nThe EEY-L suffix denotes: E = enhanced ESD version, Y = TSSOP-16 package, -L = -40\u00b0C to +85\u00b0C industrial temperature range, tape and reel. The SP3232E does not include shutdown or tri-state features (those are on the SP3222E variant). Supply current is 0.3 mA typical at no load with 3.3-V supply, making it suitable for always-on serial ports in battery-powered devices.","working_principle":"**Charge Pump (Voltage Doublers):** The SP3232E uses a regulated dual charge pump to generate RS-232 voltage levels from a single 3.0-5.5-V supply. The first stage is a voltage doubler (C1 charge pump) that produces V+ \u2248 2 \u00d7 VCC from the C1+\/C1- pins. The second stage is a voltage inverter (C2 charge pump) that produces V- \u2248 -2 \u00d7 VCC from the C2+\/C2- pins. A V+ storage capacitor (C3) and V- storage capacitor (C4) smooth the outputs. Regulation limits V+ and V- magnitudes to approximately 5.5 V to prevent exceeding RS-232 maximums.\n\n**Driver Stage:** Each driver converts TTL\/CMOS logic levels (0.8-V low, 2.4-V high thresholds) to RS-232 levels (\u00b15.4-V swing typical). When the logic input is high, the output swings negative; when low, the output swings positive (inverting). The output is current-limited and can drive a 3-k\u03a9 load with 1000-pF cable capacitance.\n\n**Receiver Stage:** Each receiver converts RS-232 input levels (\u00b13-V to \u00b115-V range) to TTL\/CMOS logic levels. The input threshold is 0.8-V TTL compatible with 0.5-V typical hysteresis for noise immunity. A 5-k\u03a9 pull-down resistor to ground on each receiver input ensures a defined logic-high output when the RS-232 cable is disconnected.","pin_description":"
| Pin<\/th> | Name<\/th> | Type<\/th> | Description<\/th><\/tr><\/thead> | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | C1+<\/td> | I\/O<\/td> | Charge pump capacitor C1 positive terminal; connect 0.1\u00b5F ceramic to C1- (pin 3)<\/td><\/tr> | ||||||||||||||||||||||||||||
| 2<\/td> | V+<\/td> | P<\/td> | Doubled positive voltage output (~5.4V); connect 0.1\u00b5F storage capacitor to GND<\/td><\/tr> | ||||||||||||||||||||||||||||
| 3<\/td> | C1-<\/td> | I\/O<\/td> | Charge pump capacitor C1 negative terminal<\/td><\/tr> | ||||||||||||||||||||||||||||
| 4<\/td> | C2+<\/td> | I\/O<\/td> | Charge pump capacitor C2 positive terminal; connect 0.1\u00b5F ceramic to C2- (pin 5)<\/td><\/tr> | ||||||||||||||||||||||||||||
| 5<\/td> | C2-<\/td> | I\/O<\/td> | Charge pump capacitor C2 negative terminal<\/td><\/tr> | ||||||||||||||||||||||||||||
| 6<\/td> | V-<\/td> | P<\/td> | Inverted negative voltage output (~-5.4V); connect 0.1\u00b5F storage capacitor to GND<\/td><\/tr> | ||||||||||||||||||||||||||||
| 7<\/td> | T2OUT<\/td> | O<\/td> | Driver 2 RS-232 output; swings \u00b15.4V typical; connects to RS-232 cable<\/td><\/tr> | ||||||||||||||||||||||||||||
| 8<\/td> | R2IN<\/td> | I<\/td> | Receiver 2 RS-232 input; accepts \u00b115V range; 5k\u03a9 internal pull-down to GND<\/td><\/tr> | ||||||||||||||||||||||||||||
| 9<\/td> | R2OUT<\/td> | O<\/td> | Receiver 2 TTL\/CMOS output; VCC-referenced logic level; drives UART RX<\/td><\/tr> | ||||||||||||||||||||||||||||
| 10<\/td> | T2IN<\/td> | I<\/td> | Driver 2 TTL\/CMOS input; connects to UART TX; inverting to RS-232 output<\/td><\/tr> | ||||||||||||||||||||||||||||
| 11<\/td> | T1IN<\/td> | I<\/td> | Driver 1 TTL\/CMOS input; connects to UART TX<\/td><\/tr> | ||||||||||||||||||||||||||||
| 12<\/td> | R1OUT<\/td> | O<\/td> | Receiver 1 TTL\/CMOS output; drives UART RX<\/td><\/tr> | ||||||||||||||||||||||||||||
| 13<\/td> | R1IN<\/td> | I<\/td> | Receiver 1 RS-232 input; accepts \u00b125V absolute max; 5k\u03a9 pull-down<\/td><\/tr> | ||||||||||||||||||||||||||||
| 14<\/td> | T1OUT<\/td> | O<\/td> | Driver 1 RS-232 output; swings \u00b15.4V typical<\/td><\/tr> | ||||||||||||||||||||||||||||
| 15<\/td> | GND<\/td> | G<\/td> | Ground; connect to PCB ground plane; charge pump returns through this pin<\/td><\/tr> | ||||||||||||||||||||||||||||
| 16<\/td> | VCC<\/td> | P<\/td> | Supply voltage 3.0-5.5V; bypass with 0.1\u00b5F ceramic close to pin<\/td><\/tr><\/tbody><\/table>","application_scenarios":"
|