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MAX3043EWE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3043EWE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 15 page required input current. At this time the SR latch resets and Q1 turns off. When Q1 turns off, EN reverts to a standard, high-impedance CMOS input. Whenever VCC drops below 1V, the hot-swap input is reset. The EN12 and EN34 input structures are identical to the EN input. For the EN input, there is a complimentary cir- cuit employing two PMOS devices pulling the EN input to VCC. Hot-Swap Line Transient The circuit of Figure 10 shows a typical offset termina- tion used to guarantee a greater than 200mV offset when a line is not driven. The 50pF represents the mini- mum parasitic capacitance which would exist in a typi- cal application. In most cases, more capacitance exists in the system and will reduce the magnitude of the glitch. During a “hot-swap” event when the driver is connected to the line and is powered up, the driver must not cause the differential signal to drop below 200mV. Figures 11 and 12 show the results of the MAX3040–MAX3045 during power-up for two different VCC ramp rates (0.1V/µs and 1V/µs). The photos show the VCC ramp, the single-ended signal on each side of the 100 Ω termination, the differential signal across the termination, and shows the hot-swap line transient stays above the 200mV RS-485 specification. Operation of Enable Pins The MAX3040–MAX3045 family has two enable-func- tional versions: The MAX3040/MAX3041/MAX3042B have two transmit- ter enable inputs EN12 and EN34. EN12 controls the transmitters 1 and 2, and EN34 controls transmitters 3 and 4. EN12 and EN34 are active-high and the part will enter the low-power shutdown mode when both are pulled low. The transmitter outputs are high impedance when disabled (Table 2). The MAX3043/MAX3044/MAX3045B have two transmit- ter enable inputs EN and EN, which are active-high and active-low, respectively. When EN is logic high or EN is logic low all transmitters are active. When EN is pulled low and EN is driven high, all transmitters are disabled and the part enters the low-power shutdown mode. The transmitter outputs are high impedance when disabled (Table 3). Applications Information Typical Applications The MAX3040–MAX3045 offer optimum performance when used with the MAX3093E/MAX3095 5V quad receivers or MAX3094E/MAX3096 3V quad differential line receivers. Figure 13 shows a typical RS-485 con- nection for transmitting and receiving data and Figure 14 shows a typical multi-point connection. ±10kV ESD-Protected, Quad 5V RS-485/RS-422 Transmitters 10 ______________________________________________________________________________________ VCC TIMER TIMER EN EN (HOT SWAP) 10 µs 85 µA Q1 Q2 5.6k Ω 700 µA Figure 9. Simplified Structure of the Driver Enable Pin (EN) |
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