MAX240 +5 5/5 4 1.0 Yes — 120 DIP or flatpack package MAX241 (MAX211) +5 4/5 4 1.0 (0.1) Yes — 120 Complete IBM PC serial port MAX242 +5 2/2 4 0.1 Yes ✔ 200 Separate shutdown and enable MAX243 +5 2/2 4 0.1 No — 200 Open-line detection simplifies cabling MAX244 +5 8/10 4 1.0 No — 120 High slew rate 对于低成本应用 MAX221E:±15kV ESD保护、+5V、1μA、 具有AutoShutdownTM功能的单芯片RS-232
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