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MAX201 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX201 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 23 page +5V, RS-232 Transceivers with 0.1µF External Capacitors 8 Applications Information Capacitor Selection The type of capacitor used is not critical for proper operation. Ceramic capacitors are suggested. To ensure proper RS-232 signal levels over temperature when using 0.1FF capacitors, make sure the capacitance value does not degrade excessively as the temperature varies. If in doubt, use capacitors with a larger nominal value. Also observe the capacitors’ ESR value over tem- perature, since it influences the amount of ripple on V+ and V-. To reduce the output impedance at V+ and V-, use larger capacitors (up to 10FF). If polarized capaci- tors are used, obey the polarities shown in Figure 1 and the pin configurations. Driving Multiple Receivers Each transmitter is designed to drive a single receiver. Transmitters can be paralleled to drive multiple receivers. Driver Outputs When Exiting Shutdown Figure 5 shows two driver outputs exiting shutdown. As they become active, the two driver outputs go to oppo- site RS-232 levels (one driver input is high, the other is low). Each driver is loaded with 3kI in parallel with 2500pF. The driver outputs display no ringing or undesir- able transients as they come out of shutdown. Power-Supply Decoupling In applications that are sensitive to power-supply noise, decouple VCC to ground with a capacitor of the same value as the charge-pump capacitors. V+ and V- as Power Supplies A small amount of power can be drawn from V+ and V-, although this reduces noise margins. Power Supplies for MAX201/MAX209 If at power-up the V+ supply rises after the VCC supply, place a diode (e.g., 1N914) in series with the V+ supply. Table 3. DB9 Cable Connections Commonly Used for EIA/TIA-232E and V.24 Asynchronous Interfaces Table 2. Summary of EIA/TIA-232E, V.28 Specifications PARAMETER CONDITION EIA/TIA-232E, V.28 SPECIFICATION Driver Output Voltage: 0 Level 3kI to 7kI load +5.0V to +15V Driver Output Voltage: 1 Level 3kI to 7kI load -5.0V to -15V Output Level, Maximum No load Q 25V Data Rate 3kI P RL P 7kI, CL P 2500pF Up to 20kbps Receiver Input Voltage: 0 Level — +3.0V to +15V Receiver Input Voltage: 1 Level — -3.0V to -15V Input Level, Maximum — Q 25V Instantaneous Slew Rate, Maximum 3kI P RL P 7kI, CL P 2500pF 30V/Fs Driver Output Short-Circuit Current, Maximum — 100mA Transition Rate on Driver Output V.28 1ms or 3% of the period EIA/TIA-232E 4% of the period Driver Output Resistance -2V < VOUT < +2V 300I PIN NAME CONNECTION 1 Received Line Signal Detector, sometimes called Carrier Detect (DCD) Handshake from DCE 2 Receive Data (RD) Data from DCE 3 Transmit Data (TD) Data from DTE 4 Data Terminal Ready Handshake from DTE 5 Signal Ground Reference point for signals 6 Data Set Ready (DSR) Handshake from DCE 7 Request to Send (RTS) Handshake from DTE 8 Clear to Send (CTS) Handshake from DCE 9 Ring Indicator Handshake from DCE |
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