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MAX3323EEUE Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX3323EEUE Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 13 page on the transmitter outputs and slightly reduces power consumption. The values of C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1’s value without also increasing the val- ues 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 equiv- alent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V-. Multidrop Applications The MAX3323E connects to the RS-232 serial port of computer peripherals such as a bar-code scanner, video security controls, industrial multimeters, etc., and allows multiple devices to share the same communica- tion cable connected to a PC. Figure 9 shows a PC UART transmitting to a single receiver with a 5k Ω termination resistor while the other receivers remain in a high-impedance state. When the receiver inputs are high impedance, they remain active and maintain receiving capability. This feature permits the design of multidrop applications, which observe the RS-232 interface standard. Transmitters are enabled and disabled through TXENABLE, allowing the sharing of a single bus line. Transmitters are high impedance when disabled. The host PC’s transmitter stays enabled at all times. Only one peripheral transmitter remains enabled at any time. If the host PC wants to communicate with another peripheral, it first must tell the current peripheral to deassert its transmitter. ±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications _______________________________________________________________________________________ 9 MAX3323E PC UART 5k Ω PERIPHERAL CONTROL WITH UART MAX3323E 5k Ω PERIPHERAL CONTROL WITH UART MAX3323E 5k Ω PERIPHERAL CONTROL WITH UART Figure 9. Multidrop Application VCC (V) C1 ( µF) C2, C3, C4 ( µF) 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1 Table 2. Minimum Required Capacitor Values |
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