The DS1487M/NOPB is a low-power Load Multipoint Transceiver for RS-485 and RS-422 communication. The device contains one driver and one receiver. The driver slew rate allows for operation up to 2Mbps. The transceiver presents 1/4-unit loading to the RS-485 bus allowing up to 128 nodes to be connected together without the use of repeaters. The transceiver draws 200µA of supply current when unloaded or fully loaded with the driver disabled and operates from a single +5V supply. The driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into tri-state (high impedance state) under fault conditions. The driver guarantees a minimum of 1.5V differential output voltage with maximum loading across the common mode range (VOD3). The receiver has a failsafe feature that guarantees a logic-high output if the input is open circuit.
● Allows up to 128 transceivers on the bus (1/4 UL)
● Guaranteed full load output voltage (VOD3)
● Tri-state outputs on driver and receiver
● Half-duplex flow-through pin-out
● Current-limiting and thermal shutdown for driver overload protection
● Pin and functional compatible with MAX1487
● 200µA Typical low quiescent current
● -7 to +12V Common-mode input voltage range
● 25ns Typical driver transition time
● 40ns Typical driver propagation delay
● 1ns Typical driver skew
● 200ns Typical receiver propagation delay
● 20ns Typical receiver skew
● Green product and no Sb/Br
