Features: True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
Enhanced Slew-Rate Limiting Facilitates
Error-Free Data Transmission
(MAX3080MAX3085/MAX3089)
1nA Low-Current Shutdown Mode (except
MAX3081/MAX3084/MAX3087)
Pin-Selectable Full/Half-Duplex Operation
(MAX3089)
Phase Controls to Correct for Twisted-Pair
Reversal (MAX3089)
Allow Up to 256 Transceivers on the BusApplicationRS-422/RS-485 Communications
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area NetworksPinout
SpecificationsSupply Voltage (VCC) ............................................................+7V
Control Input Voltage ,RE, DE)......................-0.3V to (VCC+ 0.3V)
Special Input Voltage
(H/F, SRL, TXP, RXP)......................................-0.3V to (VCC+ 0.3V)
Driver Input Voltage (DI)...............................-0.3V to (VCC+ 0.3V)
Driver Output Voltage (A, B, Y, Z)..........................................±13V
Receiver Input Voltage (A, B)................................................±13V
Receiver Input Voltage, Full Duplex (A, B).............................±25V
Receiver Output Voltage (RO).......................-0.3V to (VCC+ 0.3V)
Continuous Power Dissipation
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C).........727mW
8-Pin SO (derate 5.88mW/°C above +70°C).....................471mW
14-Pin Plastic DIP (derate 10.0mW/°C above +70°C)
....800mW
14-Pin SO (derate 8.33mW/°C above +70°C)...................667mW
Operating Temperature Ranges
MAX308_C_ _...........................................................0°C to +70°C
MAX308_E_ _........................................................-40°C to +85°C
Storage Temperature Range...............................-65°C to +150°C
Lead Temperature (soldering, 10sec)................................+300°C
DescriptionThe MAX3080MAX3089 high-speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). The MAX3080/MAX3081/MAX3082 feature reduced slew-rate drivers that minimize EMI and reduce reflec- tions caused by improperly terminated cables, allowing error-free data transmission up to 115kbps. The MAX3083/MAX3084/MAX3085 offer higher driver out- put slew-rate limits, allowing transmit speeds up to 500kbps. TheMAX3086/MAX3087/MAX3088's driver slew rates are not limited, making transmit speeds up to 10Mbps possible. The MAX3089's slew rate is selectable between 115kbps, 500kbps, and 10Mbps by driving a selector pin with a single three-state driver.
These transceivers typically draw 375µA of supply current when unloaded, or when fully loaded with the drivers disabled.
The MAX3080MAX3089 have a 1/8-unit-load receiver input imped- ance that allows up to 256 transceivers on the bus. The MAX3082/MAX3085/MAX3088 are intended for half- duplex communications, while the MAX3080/MAX3081/ MAX3083/MAX3084/MAX3086/MAX3087 are intended for full-duplex communications. The MAX3089 is selec- table between half-duplex and full-duplex operation. It also features independently programmable receiver and transmitter output phase via separate pins.
MAX3081 Data Sheet
