MAX14840E

The MAX14840E/MAX14841E transceivers draw 1.5mA (typ)supply current when unloaded or when fully loaded with the drivers disabled. Hot-swap capability eliminates undesired transitions on the bus during power-up or hot insertion. The MAX14840E/MAX14841E are +3.3V ESD-protected transceivers intended for half-duplex RS-485 communication up to 40Mbps. The MAX14840E/MAX14841E are available in 8-pin SO and small, 8-pin (3mm x 3mm)TDFN-EP packages. Both devices operate over the -40°C to +125°C automotive temperature range. These transceivers are optimized for high speeds over extended cable runs while maximizing tolerance to noise. The MAX14840E features symmetrical fail-safe and larger receiver hysteresis, providing improved noise rejection and improved recovered signals in high-speed and long cable applications. The MAX14841E has true failsafe receiver inputs guaranteeing a logic-high receiver output when inputs are shorted or open.

The features of MAX14840E can be summarized as (1)half-duplex RS-485 transceivers; (2)+3.3V supply voltage; (3)40Mbps Maximum Data Rate; (4)large (170mV)receiver hysteresis on MAX14840E; (5)symmetrical fail-safe receiver input on MAX14840E; (6)fail-safe receiver input (MAX14841E); (7)hot-swap capability; (8)short-circuit protected outputs; (9)thermal self-protection; (10)Low 10A (max)shutdown current; (11)extended ESD protection for RS-485 I/O Pins ±35kV Human Body Model (HBM)/ ±20kV air-gap discharge per IEC 61000-4-2/ ±12kV contact discharge per IEC 61000-4-2; (12)automotive -40°C to +125°C operating temperature range:; (13)available in Industry-Standard 8-Pin SO or space-saving, 8-Pin TDFN-EP (3mm x 3mm)packages.

The absolute maximum ratings of MAX14840E are (1)VCC: -0.3V to +6.0V; (2)RE, RO: -0.3V to +(VCC + 0.3V); (3)DE, DI: -0.3V to +6.0V; (4)A, B: -8.0V to +13.0V; (5)short-circuit duration (RO, A, B)to GND: continuous; (6)continuous power dissipation (TA = +70°C)8-Pin SO (derate 7.6mW/°C above +70°C): 606mW/ 8-Pin TDFN (derate 24.4mW/°C above +70°C): 1951mW; (7)junction-to-case thermal resistance (BJC)(Note 1)8-Pin SO: 38°C/W/ 8-Pin TDFN: 8°C/W; (8)junction-to-ambient thermal resistance (BJA)(Note 1)8-Pin SO: 132°C/W/ 8-Pin TDFN: 41°C/W; (9)operating temperature range: -40°C to +125°C; (10)Junction Temperature: +150°C; (11)storage temperature range: -65°C to +150°C; (12)lead temperature (soldering, 10s): +300°C; (13)soldering temperature (reflow): +260°C.