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MAX208EEWG Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX208EEWG Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 25 page 10 ______________________________________________________________________________________ ±15kV ESD-Protected, +5V RS-232 Transceivers When in low-power shutdown mode, the MAX205E/ MAX206E/MAX211E/MAX213E/MAX241E driver outputs are turned off and draw only leakage currents—even if they are back-driven with voltages between 0V and 12V. Below -0.5V in shutdown, the transmitter output is diode-clamped to ground with a 1kΩ series impedance. RS-232 Receivers The receivers convert the RS-232 signals to CMOS-logic output levels. The guaranteed 0.8V and 2.4V receiver input thresholds are significantly tighter than the ±3V thresholds required by the EIA/TIA-232E specification. This allows the receiver inputs to respond to TTL/CMOS- logic levels, as well as RS-232 levels. The guaranteed 0.8V input low threshold ensures that receivers shorted to ground have a logic 1 output. The 5kΩ input resistance to ground ensures that a receiver with its input left open will also have a logic 1 output. Receiver inputs have approximately 0.5V hysteresis. This provides clean output transitions, even with slow rise/fall-time signals with moderate amounts of noise and ringing. In shutdown, the MAX213E’s R4 and R5 receivers have no hysteresis. Shutdown and Enable Control (MAX205E/MAX206E/MAX211E/ MAX213E/MAX241E) In shutdown mode, the charge pumps are turned off, V+ is pulled down to VCC, V- is pulled to ground, and the transmitter outputs are disabled. This reduces supply current typically to 1µA (15µA for the MAX213E). The time required to exit shutdown is under 1ms, as shown in Figure 5. Receivers All MAX213E receivers, except R4 and R5, are put into a high-impedance state in shutdown mode (see Tables 1a and 1b). The MAX213E’s R4 and R5 receivers still function in shutdown mode. These two awake-in- shutdown receivers can monitor external activity while maintaining minimal power consumption. The enable control is used to put the receiver outputs into a high-impedance state, to allow wire-OR connection of two EIA/TIA-232E ports (or ports of different types) at the UART. It has no effect on the RS-232 drivers or the charge pumps. Note: The enable control pin is active low for the MAX211E/MAX241E (EN), but is active high for the MAX213E (EN). The shutdown control pin is active high for the MAX205E/MAX206E/MAX211E/MAX241E (SHDN), but is active low for the MAX213E (SHDN). C1- IL- RL- V+ S1 V - fCLK S2 S5 S6 C1 C3 C2 IL + RL + S3 S4 S7 S8 C4 C1+ GND GND VCC VCC C2- C2+ PART fCLK (kHz) MAX202E MAX211E/213E MAX232E MAX203E 230 MAX205E–208E 200 200 140 MAX241E 30 230 Figure 4. Charge-Pump Diagram |
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