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MAX3223 Datasheet(PDF) 2 Page - Texas Instruments |
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MAX3223 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 16 page MAX3223 3V TO 5.5V MULTICHANNEL RS232 LINE DRIVER/RECEIVER WITH ±15kV ESD PROTECTION SLLS409K − JANUARY 2000 − REVISED MARCH 2004 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) Flexible control options for power management are available when the serial port is inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is set low and EN is high, both drivers and receivers are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes auto-powerdown to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any receiver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than −2.7 V, or has been between −0.3 V and 0.3 V for less than 30 µs. INVALID is low (invalid data) if the receiver input voltage is between −0.3 V and 0.3 V for more than 30 µs. Refer to Figure 4 for receiver input levels. Function Tables EACH DRIVER INPUTS OUTPUT DIN FORCEON FORCEOFF VALID RIN RS-232 LEVEL OUTPUT DOUT DRIVER STATUS X X L X Z Powered off L H H X H Normal operation with H HH X L Normal operation with auto-powerdown disabled L L H Yes H Normal operation with H LH Yes L Normal operation with auto-powerdown enabled L L H No Z Powered off by H L H No Z Powered off by auto-powerdown feature H = high level, L = low level, X = irrelevant, Z = high impedance EACH RECEIVER INPUTS OUTPUT RIN EN VALID RIN RS-232 LEVEL OUTPUT ROUT L L X H H LX L X HX Z Open L No H H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or connected driver off |
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