MAX491ESD

Product Summary

The MAX491ESD is a low-power transceiver for RS-485 and RS-422 communication. Each part contains one driver and one receiver. The MAX491ESD features reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, thus allowing error-free data transmission up to 250kbps. The driver slew rates of the MAX491ESD are not limited, allowing them to transmit up to 2.5Mbps. The transceiver draws between 120μA and 500μA of supply current when unloaded or fully loaded with disabled drivers.

Parametrics

MAX491ESD absolute maximum ratings: (1)Supply Voltage (VCC): 12V; (2)Control Input Voltage (–R—E – , DE): -0.5V to (VCC + 0.5V); (3)Driver Input Voltage (DI): -0.5V to (VCC + 0.5V); (4)Driver Output Voltage (A, B): -8V to +12.5V; (5)Receiver Input Voltage (A, B): -8V to +12.5V; (6)Receiver Output Voltage (RO): -0.5V to (VCC +0.5V); (7)Continuous Power Dissipation (TA = +70℃): 8-Pin Plastic DIP (derate 9.09mW/℃ above +70℃): 727mW; 14-Pin Plastic DIP (derate 10.00mW/℃ above +70℃): 800mW; 8-Pin SO (derate 5.88mW/℃ above +70℃): 471mW; 14-Pin SO (derate 8.33mW/℃ above +70℃): 667mW; 8-Pin μMAX (derate 4.1mW/℃ above +70℃): 830mW; 8-Pin CERDIP (derate 8.00mW/℃ above +70℃): 640mW; 14-Pin CERDIP (derate 9.09mW/℃ above +70℃): 727mW; (8)Operating Temperature Ranges: MAX4_ _C_ _/MAX1487C_ A: 0℃ to +70℃; MAX4_ _E_ _/MAX1487E_ A: -40℃ to +85℃; MAX4_ _MJ_/MAX1487MJA: -55℃ to +125℃; (9)Storage Temperature Range: -65℃ to +160℃; (10)Lead Temperature (soldering, 10sec): +300℃.

Features

MAX491ESD features: (1)In μMAX Package: Smallest 8-Pin SO; (2)Slew-Rate Limited for Error-Free Data Transmission (MAX483/487/488/489); (3)0.1μA Low-Current Shutdown Mode(MAX481/483/487); (4)Low Quiescent Current: 120μA (MAX483/487/488/489); 230μA (MAX1487); 300μA (MAX481/485/490/491); (5)-7V to +12V Common-Mode Input Voltage Range; (6)Three-State Outputs; (7)30ns Propagation Delays, 5ns Skew(MAX481/485/490/491/1487); (8)Full-Duplex and Half-Duplex Versions Available; (9)Operate from a Single 5V Supply; (10)Allows up to 128 Transceivers on the Bus(MAX487/MAX1487); (11)Current-Limiting and Thermal Shutdown for Driver Overload Protection.

Diagrams