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MAX3483CPA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3483CPA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 17 page ____________________Function Tables Devices with Receiver/Driver Enable (MAX3483/MAX3485/MAX3486/MAX3491) Table 1. Transmitting * B and A outputs are Z and Y, respectively, for full-duplex part (MAX3491). X = Don’t care; High-Z = High impedance Table 2. Receiving * DE is a “don’t care” (x) for the full-duplex part (MAX3491). X = Don’t care; High-Z = High impedance Devices without Receiver/Driver Enable (MAX3488/MAX3490) Table 3. Transmitting Table 4. Receiving __________Applications Information The MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/ MAX3491 are low-power transceivers for RS-485 and RS-422 communications. The MAX3483 and MAX3488 can transmit and receive at data rates up to 250kbps, the MAX3486 at up to 2.5Mbps, and the MAX3485/ MAX3490/MAX3491 at up to 10Mbps. The MAX3488/ MAX3490/MAX3491 are full-duplex transceivers, while the MAX3483/MAX3485/MAX3486 are half-duplex. Driver Enable (DE) and Receiver Enable (RE) pins are included on the MAX3483/MAX3485/MAX3486/ MAX3491. When disabled, the driver and receiver out- puts are high impedance. Reduced EMI and Reflections (MAX3483/MAX3486/MAX3488) The MAX3483/MAX3488 are slew-rate limited, minimiz- ing EMI and reducing reflections caused by improperly terminated cables. Figure 13 shows both the driver output waveform of a MAX3485/MAX3490/MAX3491 transmitting a 125kHz signal and the Fourier analysis of that waveform. High-frequency harmonics with large amplitudes are evident. Figure 14 shows the same infor- mation, but for the slew-rate-limited MAX3483/MAX3488 transmitting the same signal. The high-frequency har- monics have much lower amplitudes, and the potential for EMI is significantly reduced. Low-Power Shutdown Mode (MAX3483/MAX3485/MAX3486/MAX3491) A low-power shutdown mode is initiated by bringing both RE high and DE low. The devices will not shut down unless both the driver and receiver are disabled (high impedance). In shutdown, the devices typically draw only 2nA of supply current. For these devices, the tPSH and tPSL enable times assume the part was in the low-power shutdown mode; the tPZH and tPZL enable times assume the receiver or driver was disabled, but the part was not shut down. 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers INPUTS OUTPUTS RE DE DI B* A* MODE X 1 1 0 1 Normal X 1 0 1 0 Normal 0 0 X High-Z High-Z Normal 1 0 X High-Z High-Z Shutdown INPUTS RE DE A, B RO MODE 0 0* ≥ +0.2V 1 Normal 0 0* ≤ -0.2V 0 Normal 0 0* Inputs Open 1 Normal 1 0 X High-Z Shutdown OUTPUTS INPUTS OUTPUT A, B RO ≥ +0.2V 1 ≤ -0.2V 0 Inputs Open 1 INPUT OUTPUTS DI Z Y 1 0 1 0 1 0 5MHz 500kHz/div 0Hz 10dB/div 5MHz 500kHz/div 0Hz 10dB/div Figure 13. Driver Output Waveform and FFT Plot of MAX3485/ MAX3490/MAX3491 Transmitting a 125kHz Signal Figure 14. Driver Output Waveform and FFT Plot of MAX3483/ MAX3488 Transmitting a 125kHz Signal Maxim Integrated 11 MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 |
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