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MAX3243CAI Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3243CAI Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 16 page 1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 8 _______________________________________________________________________________________ other system to realize that the MAX3221/MAX3223/ MAX3243 is awake. If the other system outputs valid RS-232 signals within that time, the RS-232 ports on both systems remain enabled. When shut down, the device’s charge pumps are turned off, V+ decays to VCC, V- decays to ground, and the transmitter outputs are disabled (high impedance). The time required to exit shutdown is typically 100µs (Figure 5b). Software-Controlled Shutdown If direct software control is desired, INVALID can be used to indicate DTR or Ring Indicator signal. Tie FORCEOFF and FORCEON together to bypass Auto- Shutdown so the line acts like a SHDN input. ___________Applications Information Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation; either polarized or nonpolarized capacitors may be used. The charge pump requires 0.1µF capacitors for 3.3V operation. For other supply voltages, refer to Table 3 for required capacitor values. Do not use values smaller than those listed in Table 3. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4 to maintain the proper ratios (C1 to the other capacitors). When using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. If in doubt, use capaci- tors with a larger nominal value. The capacitor’s equiva- lent series resistance (ESR) usually rises at low temperatures and influences the amount of ripple on V+ and V-. Table 2. AutoShutdown Logic RS-232 SIGNAL PRESENT AT RECEIVER INPUT F FO OR RC CE EO OF FF F INPUT FORCEON INPUT IIN NV VA AL LIID D OUTPUT TRANSCEIVER STATUS Yes H X H Normal Operation No H H L Normal Operation (Forced On) No H L L Shutdown (AutoShutdown) Yes L X H Shutdown (Forced Off) No L X L Shutdown (Forced Off) V- VCC 0 V+ 0 VCC tINVL tWU INVALID REGION RECEIVER INPUT VOLTAGE (V) INVALID OUTPUT (V) tINVH TRANSMITTERS ENABLED, INVALID HIGH AUTOSHUTDOWN, TRANSMITTERS DISABLED, 1 µA SUPPLY CURRENT, INVALID LOW TRANSMITTERS ENABLED, INVALID HIGH -2.7V -0.3V +2.7V +0.3V 0V INDETERMINATE INDETERMINATE (b) (a) Figure 5. AutoShutdown Trip Levels |
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