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MAX3320_EAP Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3320_EAP Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page 3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4µA AutoShutdown Plus and Power-On Reset 8 _______________________________________________________________________________________ __________Applications Information Ensuring a Valid Reset Output Down to VCC = 0V When VCC falls below 1V, RESET no longer sinks cur- rent: it becomes an open circuit. Therefore, high- impedance CMOS logic inputs connected to RESET can drift to undefined voltages. This presents no prob- lem in most applications, since most µPs and other cir- cuitry is inoperative with VCC below 1V. However, in applications where RESET must be valid down to 0V, add a pull-down resistor to ground, holding RESET low (Figure 4). R1’s value is not critical; 100k Ω is large enough not to load RESET, and small enough to pull it to ground. Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation; use either polarized or nonpolarized capacitors. The charge pump requires 0.1µF capaci- tors for 3.3V operation. For other supply voltages, refer to Table 3 for required capacitor values. Do not use val- ues 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, C4, and CBYPASS, to maintain the proper ratios (C1 to the other capacitors). -2.7V -0.3V 2.7V 0.3V 0V INDETERMINATE INVALID HIGH INVALID LOW INVALID HIGH INDETERMINATE Figure 3b. Receiver Positive/Negative Thresholds for INVALID Figure 3a. AutoShutdown Plus and INVALID Timing Diagram VCC 0 V+ V- VCC 0 INVALID OUTPUT * ALL RECEIVER/TRANSMITTER INPUTS INACTIVE ** ANY ONE RECEIVER/TRANSMITTER INPUT BECOMES ACTIVE FORCEON = GND, FORCEOFF = VCC TRANSMITTER INPUTS VOLTAGE RECEIVER INPUTS VOLTAGE TRANSMITTER OUTPUTS VOLTAGE tAUTOSHDN INVALID REGION * ** tWU tWU INVL tAUTOSHDN |
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