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MAX491ECSD Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX491ECSD Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page ±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers _______________________________________________________________________________________ 9 __________Function Tables (MAX481E/MAX483E/MAX485E/MAX487E/MAX1487E) Table 1. Transmitting Table 2. Receiving INPUTS OUTPUT RE DE A-B RO 0 0 0 1 0 0 0 0 > +0.2V < -0.2V Inputs open X 1 0 1 High-Z * X = Don't care High-Z = High impedance * Shutdown mode for MAX481E/MAX483E/MAX487E INPUTS OUTPUTS RE DE DI Z Y X X 0 1 1 1 0 0 1 0 X X 0 1 High-Z High-Z * 1 0 High-Z High-Z * X = Don't care High-Z = High impedance * Shutdown mode for MAX481E/MAX483E/MAX487E __________Applications Information The MAX481E/MAX483E/MAX485E/MAX487E–MAX491E and MAX1487E are low-power transceivers for RS-485 and RS-422 communications. These “E” versions of the MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 provide extra protection against ESD. The rugged MAX481E, MAX483E, MAX485E, MAX497E– MAX491E, and MAX1487E are intended for harsh envi- ronments where high-speed communication is important. These devices eliminate the need for transient suppres- sor diodes and the associated high capacitance loading. The standard (non-“E”) MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 are recommended for applications where cost is critical. The MAX481E, MAX485E, MAX490E, MAX491E, and MAX1487E can transmit and receive at data rates up to 2.5Mbps, while the MAX483E, MAX487E, MAX488E, and MAX489E are specified for data rates up to 250kbps. The MAX488E–MAX491E are full-duplex transceivers, while the MAX481E, MAX483E, MAX487E, and MAX1487E are half-duplex. In addition, driver- enable (DE) and receiver-enable (RE) pins are included on the MAX481E, MAX483E, MAX485E, MAX487E, MAX489E, MAX491E, and MAX1487E. When disabled, the driver and receiver outputs are high impedance. ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electro- static discharges encountered during handling and assembly. The driver outputs and receiver inputs have extra protection against static electricity. Maxim’s engi- neers developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim’s MAX481E, MAX483E, MAX485E, MAX487E–MAX491E, and MAX1487E keep working without latchup. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to ±15kV using the Human Body Model. Other ESD test methodologies include IEC10004-2 con- tact discharge and IEC1000-4-2 air-gap discharge (for- merly IEC801-2). ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test set-up, test methodology, and test results. Human Body Model Figure 4 shows the Human Body Model, and Figure 5 shows the current waveform it generates when dis- charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of inter- est, which is then discharged into the test device through a 1.5k Ω resistor. IEC1000-4-2 The IEC1000-4-2 standard covers ESD testing and per- formance of finished equipment; it does not specifically refer to integrated circuits (Figure 6). |
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