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F81438G，單5V RS232/RS422/RS485多協(xié)議
單5伏RS232/RS422/RS485多協(xié)議,
?概述F81438是可編程的單片多協(xié)議收發(fā)器設(shè)備，包含RS-232和RS-485/RS-422驅(qū)動(dòng)器和接收器。F81438可重新配置為四種操作模式，包括僅RS-232（3TX/5RX）、一個(gè)RS-485（1TX/1RX）驅(qū)動(dòng)器（TX）半雙工模式、一個(gè)RS-485（1TX/2RX）接收器（RX）半雙工方式和RS-422（1TX/1RX）全雙工模式，可隨時(shí)通過(guò)更改2個(gè)模式選擇引腳的邏輯狀態(tài)進(jìn)行選擇。該設(shè)備可以實(shí)現(xiàn)雙模串行端口、混合模式端口或作為接口信號(hào)轉(zhuǎn)換器。額外的電荷泵從5V的單個(gè)電源提供真正的RS-232驅(qū)動(dòng)器輸出電壓。轉(zhuǎn)換速率控制引腳為高數(shù)據(jù)速率或轉(zhuǎn)換控制數(shù)據(jù)速率配置驅(qū)動(dòng)器輸出�；剞D(zhuǎn)控制輸出可最大限度地減少長(zhǎng)端或未端接電纜上的反射和振鈴引起的問(wèn)題。所有RS-485接收器或收發(fā)器都具有高阻抗，允許在共享總線上最多256個(gè)收發(fā)器。當(dāng)配置為RS-485/RS-422模式時(shí)，每個(gè)驅(qū)動(dòng)器可以單獨(dú)啟用或置于三態(tài)，從而簡(jiǎn)化了共享總線或雙向通信上的使用。所有接收器都有先進(jìn)的故障保護(hù)，以防止輸入未連接時(shí)發(fā)生振蕩。在RS-232模式下，每個(gè)接收器輸入具有5k?下拉至地。如果輸入為浮動(dòng)、短路或開(kāi)路但已終止，則差分接收器將默認(rèn)為輸出邏輯1。所有驅(qū)動(dòng)器輸出和接收器輸入都受到保護(hù)，以防高達(dá)±15000伏的ESD沖擊（IEC 61000-4-2氣隙）。2功能列表5V單電源操作穩(wěn)健的±15kV ESD保護(hù)（IEC 61000-4-2氣隙）RS-232/RS-485混合模式可調(diào)整的轉(zhuǎn)換速率，最大限度地減少EMI誤差打開(kāi)時(shí)RS-485提前故障保護(hù)，短或端接線路28針TSSOP封裝靈活的4種操作模式由2個(gè)配置引腳選擇一套3T5R RS-232 V.28驅(qū)動(dòng)器和接收器一套R(shí)S-485驅(qū)動(dòng)器（半雙工配置）一套R(shí)S-485接收器（半雙工組態(tài)）一套R(shí)S-422驅(qū)動(dòng)器和接收器（全雙工配置

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