外文翻譯---max232-5v的供電，多通道rs-232接口驅(qū)動(dòng)器接收器-文庫吧在線文庫
【正文】 ivers are disabled during shutdown. On the MAX223 and MAX242? two receivers continue to operate in a reduced power mode when the chip is in shutdown. Under these conditions? the propagation delay increases to about for a hightolow input transition. When in shutdown, the receiver acts as a CMOS inverter with no hysteresis. The MAX223 and MAX242 also have a receiver output enable input (EN for the MAX242 and EN for the MAX223) that allows receiver output control independent of SHDN (SHDN for MAX241). With all other devices? SHDN (SHDN for MAX241) also disables the receiver outputs.The MAX225 provides five transmitters and five receivers? while the MAX245 provides ten receivers and eight transmitters. Both devices have separate receiver and transmitterenable controls. The charge pumps turn off and the devices shut down when a logic high is applied to the ENT input. In this state, the supply current drops to less than 25μA and the receivers continue to operate in a lowpower receive mode. Driver outputs enter a highimpedance state (threestate mode). On the MAX225?all five receivers are controlled by the ENR input. On the MAX245? eight of the receiver outputs are controlled by the ENR input? while the remaining two receivers (RA5 and RB5) are always active. RA1–RA4 and RB1–RB4 are put in a threestate mode when ENR is a logic high.The MAX247 provides nine receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs each control four drivers. The ninth receiver (RB5) is always active. The device enters shutdown mode with a logic high on both ENTA and ENTB.The MAX248 provides eight receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs control four drivers each. This part does not have an alwaysactive receiver. The device enters shutdown mode and transmitters go into a threestate mode with a logic high on both ENTA and ENTB.附錄BMAX2325V的供電，多通道RS232接口驅(qū)動(dòng)器/接收器 該MAX232是一種雙驅(qū)動(dòng)器/接收器，其中包括一個(gè)電容式電壓發(fā)電機(jī)，供應(yīng)TIA/EIA232F一個(gè)單一的5 V電源。10V。這是因?yàn)閂+接到VCC是在關(guān)斷模式狀態(tài)下。上拉電阻使得未使用的驅(qū)動(dòng)器輸出電壓變低，因?yàn)樗械尿?qū)動(dòng)器倒置了。 該MAX239接收器有三態(tài)控制線，并且MAX223，MAX225，
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