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MAX3483EESA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3483EESA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page _____________________Function Tables Devices with Receiver/Driver Enable (MAX3483E/MAX3485E/MAX3486E/MAX3491E) Table 1. Transmitting * B and A outputs are Z and Y, respectively, for full-duplex part (MAX3491E). X = Don’t care; High-Z = High impedance Table 2. Receiving * DE is a “don’t care” (x) for the full-duplex part (MAX3491E). X = Don’t care; High-Z = High impedance Devices without Receiver/Driver Enable (MAX3488E/MAX3490E) Table 3. Transmitting Table 4. Receiving ___________Applications Information The MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E are low-power transceivers for RS-485 and RS-422 communications. The MAX3483E and MAX3488E can transmit and receive at data rates up to 250kbps, the MAX3486E at up to 2.5Mbps, and the MAX3485E/MAX3490E/MAX3491E at up to 12Mbps. The MAX3488E/MAX3490E/MAX3491E are full-duplex trans- ceivers, while the MAX3483E/MAX3485E/MAX3486E are half-duplex. Driver Enable (DE) and Receiver Enable (RE) pins are included on the MAX3483E/MAX3485E/ MAX3486E/MAX3491E. When disabled, the driver and receiver outputs are high impedance. Reduced EMI and Reflections (MAX3483E/MAX3486E/MAX3488E) The MAX3483E/MAX3488E are slew-rate limited, mini- mizing EMI and reducing reflections caused by improp- erly terminated cables. Figure 13 shows the driver output waveform of a MAX3485E/MAX3490E/MAX3491E transmitting a 125kHz signal, as well as the Fourier analysis of that waveform. High-frequency harmonics with large amplitudes are evident. Figure 14 shows the same information, but for the slew-rate-limited MAX3483E/MAX3488E transmitting the same signal. The high-frequency harmonics have much lower amplitudes, and the potential for EMI is significantly reduced. Low-Power Shutdown Mode (MAX3483E/MAX3485E/MAX3486E/MAX3491E) 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, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers ______________________________________________________________________________________ 11 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 0 10dB/div 5MHz 500kHz/div 0 10dB/div Figure 13. Driver Output Waveform and FFT Plot of MAX3485E/ MAX3490E/MAX3491E Transmitting a 125kHz Signal Figure 14. Driver Output Waveform and FFT Plot of MAX3483E/ MAX3488E Transmitting a 125kHz Signal |
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