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MAX483CPA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX483CPA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page Low-Power Shutdown Mode (MAX481/MAX483/MAX487) 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. In shutdown, the devices typically draw only 0.1µA of supply current. RE and DE may be driven simultaneously; the parts are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If the inputs are in this state for at least 600ns, the parts are guaranteed to enter shutdown. For the MAX481, MAX483, and MAX487, the tZH and tZL enable times assume the part was not in the low- power shutdown state (the MAX485/MAX488–MAX491 and MAX1487 can not be shut down). The tZH(SHDN) and tZL(SHDN) enable times assume the parts were shut down (see Electrical Characteristics). It takes the drivers and receivers longer to become enabled from the low-power shutdown state (tZH(SHDN), tZL(SHDN)) than from the operating mode (tZH, tZL). (The parts are in operating mode if the – R — E – , DE inputs equal a logical 0,1 or 1,1 or 0, 0.) Driver Output Protection Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. A foldback current limit on the output stage provides immediate protection against short cir- cuits over the whole common-mode voltage range (see Typical Operating Characteristics). In addition, a ther- mal shutdown circuit forces the driver outputs into a high-impedance state if the die temperature rises excessively. Propagation Delay Many digital encoding schemes depend on the differ- ence between the driver and receiver propagation delay times. Typical propagation delays are shown in Figures 15–18 using Figure 14’s test circuit. The difference in receiver delay times, | tPLH - tPHL |, is typically under 13ns for the MAX481, MAX485, MAX490, MAX491, and MAX1487 and is typically less than 100ns for the MAX483 and MAX487–MAX489. The driver skew times are typically 5ns (10ns max) for the MAX481, MAX485, MAX490, MAX491, and MAX1487, and are typically 100ns (800ns max) for the MAX483 and MAX487–MAX489. Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers ______________________________________________________________________________________ 11 10dB/div 0Hz 5MHz 500kHz/div 10dB/div 0Hz 5MHz 500kHz/div Figure 12. Driver Output Waveform and FFT Plot of MAX481/ MAX485/MAX490/MAX491/MAX1487 Transmitting a 150kHz Signal Figure 13. Driver Output Waveform and FFT Plot of MAX483/ MAX487–MAX489 Transmitting a 150kHz Signal |
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