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SN75C3238DWRE4 Datasheet(PDF) 2 Page - Texas Instruments |
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SN75C3238DWRE4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 20 page SN65C3238, SN75C3238 3V TO 5.5V MULTICHANNEL RS232 COMPATIBLE LINE DRIVER/RECEIVER SLLS352F − JUNE 1999 − REVISED OCTOBER 2004 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) Flexible control options for power management are featured when the serial-port and driver inputs are inactive. The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for 30 s, the built-in charge-pump and drivers are powered down, reducing the supply current to 1 µA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus will occur if there is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown plus enabled, the device automatically activates once a valid signal is applied to any receiver or driver 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 all receiver input voltages are 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 TIME ELAPSED SINCE LAST RIN OR DIN TRANSITION 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 plus disabled L L H <30 s H Normal operation with H L H <30 s L Normal operation with auto-powerdown plus enabled L L H >30 s Z Powered off by H L H >30 s Z Powered off by auto-powerdown plus feature H = high level, L = low level, X = irrelevant, Z = high impedance EACH RECEIVER INPUTS OUTPUTS RIN2 RIN1, RIN3−RIN5 FORCEOFF TIME ELAPSED SINCE LAST RIN OR DIN TRANSITION ROUT1B ROUT RECEIVER STATUS L X L X L Z Powered off while H XL X H Z Powered off while ROUT1B is active L L H <30 s L H L H H <30 s L L Normal operation with H L H <30 s H H Normal operation with auto-powerdown plus disabled/enabled H H H <30 s H L auto-powerdown plus disabled/enabled Open Open H >30 s L H H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or connected driver off |
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