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MAX3462 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3462 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page +5V, Fail-Safe, 20Mbps, Profibus RS-485/ RS-422 Transceivers ______________________________________________________________________________________ 11 Applications Information 128 Transceivers on the Bus The standard RS-485 receiver input impedance is 12k Ω (one-unit load), and the standard driver can drive up to 32 unit loads. The MAX3460–MAX3464 family of trans- ceivers has a 1/4-unit-load receiver input impedance (48k Ω), allowing up to 128 transceivers to be connect- ed in parallel on one communication line. Any combina- tion of these devices and/or other RS-485 transceivers with a total of 32 unit loads or less can be connected to the line. Low-Power Shutdown Mode (except MAX3462) Low-power shutdown mode is initiated by bringing SHDN high (MAX3460/MAX3461), or both RE high and DE low. In shutdown, the devices typically draw only 1µA of supply current. RE and DE can be driven simul- taneously; the parts are guaranteed not to enter shut- down if RE is high and DE is low for less than 50ns. If the inputs are in this state for at least 800ns, the parts are guaranteed to enter shutdown. Driver Output Protection Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus con- tention. The first, 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). The second, a ther- mal shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature exceeds +140°C. Propagation Delay Many digital encoding schemes depend on the difference between the driver and receiver propagation delay times. Typical propagation delays are shown in the Typical Operating Characteristics. The difference in receiver delay times, |tPLH - tPHL|, is a maximum of 2ns. The driver skew time |tPLH - tPHL| is also a maximum of 2ns. Typical Applications The MAX3460–MAX3464 transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 13 and 14 show typical net- work applications circuits. To minimize reflections, the line should be terminated at both ends in its character- istic impedance, and stub lengths off the main line should be kept as short as possible. Profibus Termination The MAX3460–MAX3464 are designed for driving Profibus termination networks. With a worst-case load- ing of two termination networks with 220 Ω termination impedance and 390 Ω pullups and pulldowns, the dri- vers can drive VA-B> 2.1V output. Chip Information TRANSISTOR COUNT: 610 PROCESS: BiCMOS VID ATE RECEIVER OUTPUT B A R Figure 12. Receiver Propagation Delay Test Circuit Ordering Information (continued) PART TEMP RANGE PIN-PACKAGE MAX3461CSD 0°C to +70°C 14 SO MAX3461CPD 0°C to +70°C 14 Plastic DIP MAX3461ESD -40°C to +85°C 14 SO MAX3461EPD -40°C to +85°C 14 Plastic DIP MAX3462CSA 0°C to +70°C 8 SO MAX3462CPA 0°C to +70°C 8 Plastic DIP MAX3462ESA -40°C to +85°C 8 SO MAX3462EPA -40°C to +85°C 8 Plastic DIP MAX3463CSA 0°C to +70°C 8 SO MAX3463CPA 0°C to +70°C 8 Plastic DIP MAX3463ESA -40°C to +85°C 8 SO MAX3463EPA -40°C to +85°C 8 Plastic DIP MAX3464CSA 0°C to +70°C 8 SO MAX3464CPA 0°C to +70°C 8 Plastic DIP MAX3464ESA -40°C to +85°C 8 SO MAX3464EPA -40°C to +85°C 8 Plastic DIP |
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