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MAX1482 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1482 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page Low-Power Shutdown Mode A low-power shutdown mode is initiated by bringing RE high and DE low. The devices will not shut down unless both the driver and receiver are disabled. In shut- down, 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 shut- down. For the receiver, the tZH and tZL enable times assume the part was not in the low-power shutdown state. The tZH(SHDN) and tZL(SHDN) enable times assume the parts were shut down (see Electrical Characteristics). It takes the 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 RE , 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 Digital encoding schemes depend on the driver and receiver skew. Skew is defined as the difference between the rising and falling propagation delay times. Typical propagation delays are shown in Figures 11 and 12 using Figure 10’s test circuit. The difference in receiver delay times, | tPLH - tPHL |, is typically under 160ns. The driver skew times are typically 160ns (800ns max). 20µA, 1⁄8-Unit-Load, Slew-Rate-Limited RS-485 Transceivers _______________________________________________________________________________________ 9 RO 5V/div B A 500mV/div 500ns/div RO 5V/div A B 500mV/div 500ns/div Figure 11. Receiver tPHL Figure 12. Receiver tPLH |
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