The MAX3221EIPWR from Texas Instruments (formerly Maxim) is a 3.3V single-channel RS-232 transceiver with \u00b115kV ESD protection, 1 driver and 1 receiver, operating at data rates up to 250 kbps. It requires only four 0.1\u00b5F external capacitors and features auto-powerdown plus mode for ultra-low 1\u00b5A standby current in a 16-pin TSSOP package.<\/p>\n
Product Overview The MAX3221EIPWR from Texas Instruments (formerly Maxim) is a 3.3V single-channel RS-232 transceiver with \u00b115kV ESD protection, 1 driver and 1 receiver, operating at data rates up to 250 kbps. It requires only four 0.1\u00b5F external capacitors and features auto-powerdown plus mode for ultra-low 1\u00b5A standby current in a 16-pin TSSOP package. 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":[138],"class_list":["post-6522","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"Single-channel RS-232 transceiver, 3-5.5V, 250kbps, \u00b115kV ESD, auto-powerdown 1\u00b5A, TSSOP-16","date_code":"","package_case":"TSSOP-16","in_stock":8700,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/max3221.pdf","price":"$1.42","product_introduction":"The MAX3221EIPWR from Texas Instruments is a single-channel RS-232 transceiver optimized for battery-powered and space-constrained applications. The 1-driver\/1-receiver configuration provides the minimum RS-232 interface needed for simple serial communication such as debug ports, programming interfaces, and single-device connections. The auto-powerdown plus feature automatically enters a 1 \u00b5A standby mode when no valid RS-232 signal is present on the receiver input, dramatically extending battery life in portable devices. The \u00b115kV ESD protection on the RS-232 pins eliminates the need for external TVS diodes in most applications. The charge pump requires only four 0.1\u00b5F capacitors, reducing board space and cost compared to designs requiring larger capacitor values. The IPWR suffix indicates TSSOP-16 tape and reel packaging.","working_principle":"The MAX3221EIPWR uses a dual charge pump to generate the \u00b15.4V to \u00b110V voltage levels required by the RS-232 standard from a single 3.0V to 5.5V supply. The first charge pump doubles the supply voltage, and the second inverts it, producing the positive and negative supplies for the driver output stage. The slew-rate-limited driver outputs comply with the EIA\/TIA-232 specification at data rates up to 250 kbps while minimizing EMI. The auto-powerdown plus circuit monitors the receiver input for valid RS-232 signal levels. If no signal is detected for approximately 30 seconds, the device enters powerdown mode, reducing supply current to 1 \u00b5A. A valid RS-232 signal on the receiver or driving the FORCEON pin high wakes the device within 100 \u00b5s. The FORCEOFF pin provides manual shutdown control.","pin_description":"
| Pin<\/th> | Name<\/th> | Function<\/th><\/tr> | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | C1+<\/td> | Charge pump capacitor 1 positive<\/td><\/tr> | ||||||||||||
| 2<\/td> | V+<\/td> | Positive charge pump output (+5.4V to +10V)<\/td><\/tr> | ||||||||||||
| 3<\/td> | C1-<\/td> | Charge pump capacitor 1 negative<\/td><\/tr> | ||||||||||||
| 4<\/td> | C2+<\/td> | Charge pump capacitor 2 positive<\/td><\/tr> | ||||||||||||
| 5<\/td> | C2-<\/td> | Charge pump capacitor 2 negative<\/td><\/tr> | ||||||||||||
| 6<\/td> | V-<\/td> | Negative charge pump output (-5.4V to -10V)<\/td><\/tr> | ||||||||||||
| 7<\/td> | TOUT<\/td> | RS-232 driver output<\/td><\/tr> | ||||||||||||
| 8<\/td> | RIN<\/td> | RS-232 receiver input<\/td><\/tr> | ||||||||||||
| 9<\/td> | ROUT<\/td> | TTL\/CMOS receiver output<\/td><\/tr> | ||||||||||||
| 10<\/td> | INVALID<\/td> | Valid RS-232 indicator (active-low)<\/td><\/tr> | ||||||||||||
| 11<\/td> | TIN<\/td> | TTL\/CMOS driver input<\/td><\/tr> | ||||||||||||
| 12<\/td> | FORCEON<\/td> | Force power-on (active-high)<\/td><\/tr> | ||||||||||||
| 13<\/td> | FORCEOFF<\/td> | Force power-off (active-low)<\/td><\/tr> | ||||||||||||
| 14-16<\/td> | GND, VCC<\/td> | Power and ground<\/td><\/tr><\/table>","application_scenarios":"The MAX3221EIPWR is ideal for battery-powered handheld devices that need occasional RS-232 communication, such as GPS receivers, barcode scanners, and medical instruments. The auto-powerdown feature ensures minimal battery drain during the long idle periods between serial communication sessions. For embedded system debug ports, the single-channel configuration provides just the TX\/RX lines needed for console access. In point-of-sale terminals, the \u00b115kV ESD protection handles cable discharge events without external protection. The TSSOP-16 package fits easily into space-constrained portable designs.","alternative_models":"
|