MAX13450E

The MAX13450E/MAX13451E have 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. All driver outputs are protected to Q30kV ESD using the Human Body Model (HBM). The MAX13451E has a FAULT alarm indication output to signal to the system that an error condition exists in the driver. The MAX13450E/MAX13451E feature strong drivers specified to drive low-impedance lines found when a fully loaded bus, based on today's 100I characteristic impedance cable, is doubly terminated. Both devices allow slew-rate limiting of the driver output to reduce EMI and reflections for data rates up to 500kbps. The MAX13450E/MAX13451E are available in a 14-pin TSSOP package and operate over the automotive -40°C to +125°C temperature range. The MAX13450E/MAX13451E are half-duplex and full- duplex RS-485/RS-422 transceivers. These devices fea- ture internal 100I and 120I termination resistors. The resistor values are pin selectable. A logic supply input allows interfacing to logic levels down to +1.8V. The MAX13451E also features a logic inversion function. The logic inversion allows phase reversal of the A-B signals in case these are inadvertently connected wrongly.

The features of MAX13450E can be summarized as (1)100I/120I pin-selectable internal termination resistors; (2)driver drives 100I double termination; (3)20Mbps (max)data rate; (4)pin-selectable slew-rate limiting; (5)logic supply input allows interfacing down to 1.8V; (6)driver fault-indication output (MAX13451E); (7)inverting of A, B line polarity (MAX13451E); (8)high-impedance driver output/receiver input when VCC supply is removed; (9)hot-swap input structure on DE, RE, and TERM; (10)extended ESD protection ±30kV Human Body Model/ ±15kV Air Gap Discharge per IEC 61000-4-2/ ±7kV contact discharge per IEC 61000-4-2; (11)1/8-unit load allows up to 256 transceivers on the bus; (12)thermal and overcurrent protected; (13)fail-safe receivers; (14)+4.5V to +5.5V supply voltage range.

The absolute maximum ratings of MAX13450E are (1)VCC, VL: -0.3V to +6V; (2)DE, RE, DI, RO, TERM, TERM100, SRL: -0.3V to (VL + 0.3V); (3)INV, FAULT: -0.3V to (VL + 0.3V); (4)A, B, Z, Y: -8V to +13V; (5)A to B (High-Z State): +14V; (6)B to A (High-Z State): +14V; (7)short-circuit duration (RO, Y, Z)to GND: Continuous; (8)continuous power dissipation (TA = +70°C)14-Pin TSSOP (derate 25.6mW/°C above +70°C): 2051mW; (9)package junction-to-ambient thermal resistance (BJA)(Note 1): 39°C/W; (10)package junction-to-case thermal resistance (BJC)(Note 1): 3°C/W; (11)operating temperature range:: -40°C to +125°C; (12)storage temperature range:: -65°C to +150°C; (13)junction temperature:: +150°C; (14)lead temperature (soldering, 10s): +300°C; (15)soldering temperature (reflow): +260°C.