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MAX3221CDBE4 Datasheet(PDF) 2 Page - Texas Instruments |
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MAX3221CDBE4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 17 page MAX3221 3V TO 5.5V SINGLECHANNEL RS232 LINE DRIVER/RECEIVER WITH ±15kV ESD PROTECTION SLLS348M − JUNE 1999 − 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 on the receiver input, the driver output is disabled. If FORCEOFF is set low and EN is high, both the driver and receiver are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition 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 the receiver input. The INVALID output notifies the user if an RS-232 signal is present at the receiver input. INVALID is high (valid data) if the 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 5 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 = disconnected input or connected driver off |
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