Features • Meets TIA/EIA RS-485 multipoint standard • Allows up to 128 transceivers on the bus (¼ U.L.) • Guaranteed full load output voltage (VOD3) • Low quiescent current: 200 µA typ • -7V to +12V common-mode input voltage range • TRI-STATE outputs on driver and receiver • AC performance: • Driver transition time: 25 ns typ • Driver propagation delay: 40 ns typ • Driver skew: 1 ns typ • Receiver propagation delay: 200 ns typ • Receiver skew: 20 ns typ • Half-duplex flow through pinout • Operates from a single 5V supply • Current-limiting and thermal shutdown for driver overload protection • Pin and functional compatible with MAX1487 Description The DS1487 is a low-power transceiver for RS-485 and RS-422 communication. The device contains one driver and one receiver. The drivers slew rate allows for operation up to 2.0 Mbps (see Applications Information section). The transceiver presents ¼ unit loading to the RS-485 bus allowing up to 128 nodes to be connected together without the use of repeaters. The transceiver draws 200 µA 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. The DS1487 is available in surface mount and DIP packages.

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Datasheet

Title		Size	Date	Other Language
	DS1487 Low Power RS-485 1/4 Unit Load Multipoint Transceiver	137 Kbytes	4-Mar-99	日本語

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Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
DS1487M/NOPB RoHS	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 665 DIGIKEY Worldwide 0 FUTURE Worldwide 1100 NEWARK Americas 533	$0.92 each at 1K+ pcs	rail of 95
DS1487MX/NOPB RoHS	SOIC NARROW	Full production Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 0 FUTURE Worldwide 1100	$0.92 each at 1K+ pcs	reel of 2500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
DS1487N	MAX1487	MAXIM	16 Nov 2008

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
DS1487M	LMDMOS	0	17710	0	0	2470000	2	700869244
DS1487MX	LMDMOS	0	17710	0	0	2470000	2	700869244
DS1487N	LMDMOS	0	17710	0	0	2470000	2	700869244

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
DS1487N	MAX1487	MAXIM	16 Nov 2008