DS485 - Low-Power RS-485/RS-422 Multipoint Transceiver

Datasheet	Packaging	Samples & Pricing	Reliability	Knowledge Base

Features

•	Meets TIA/EIA RS-485 multipoint standard
•	Guaranteed full load output voltage (V_OD3)
•	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
•	Allows up to 32 transceivers on the bus
•	Current-limiting and thermal shutdown for driver overload protection
•	Industrial temperature range operation
•	Pin and functional compatible with MAX485 and LTC485

General Description

The DS485 is a low-power transceiver for RS-485 and RS-422 communication. More...

Parameters Values

Function Transceiver

Channels 1 Channels

Max Data Rate 2.5 Mbps

SupplyVoltage 5 Volt

Process CMOS

Special Features Low Power

Temperature Min -40 deg C

Temperature Max 85 deg C

JTAG1149.1 No

Drivers 1

Receivers 1

Connection Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
DS485 Low Power RS-485/RS-422 Multipoint Transceiver	550 Kbytes	19-Nov-04	Download
DS485 Low Power RS-485/RS-422 Multipoint Transceiver (Japanese)	267 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

DS485M

SOIC NARROW

NOPB

260

RoHS

Download

Full production

N/A

1K+

$0.90

rail
of
95

NSZXTT
DS485
M

6 weeks

3000

DS485TM

SOIC NARROW

NOPB
STD

1
1

260
235

RoHS

Download

Full production

N/A

1K+

$0.91

rail
of
95

NSZXTT
DS485
TM

6 weeks

1000

DS485MX

SOIC NARROW

NOPB
STD

1
1

260
235

RoHS

Download

Full production

N/A

1K+

$0.90

reel
of
2500

NSZXTT
DS485
M

6 weeks

10000

DS485TMX

SOIC NARROW

NOPB
STD

1
1

260
235

RoHS

Download

Full production

N/A

1K+

$0.91

reel
of
2500

NSZXTT
DS485
TM

6 weeks

7500

DS485N

MDIP

NOPB

RoHS

Download

Full production

N/A

1K+

$1.06

rail
of
40

NSUZXYTTE#
DS485
N

16 weeks

7500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
DS485TN	LTC485	LINEAR TECHNOLOGY	16 Nov 2008

General Description

The DS485 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 2.5 Mbps (see Applications Information section).

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 (V_OD3).

The receiver has a failsafe feature that guarantees a logic-high output if the input is open circuit.

The DS485 is available in surface mount and DIP packages and is characterized for Industrial and Commercial temperature range operation.

Reliability Metrics

Part Number	Process	EFR Sample Size	LTA Device Hours	FITS	MTTF (Hours)
DS485M	LMDMOS	17710	2470000	2	700869244
DS485MX	LMDMOS	17710	2470000	2	700869244
DS485N	LMDMOS	17710	2470000	2	700869244
DS485TM	LMDMOS	17710	2470000	2	700869244
DS485TMX	LMDMOS	17710	2470000	2	700869244
DS485TN	LMDMOS	17710	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.

For more information on Reliability Metrics, please click here.

[Information as of 8-Nov-2009]