MAX485D

RS-485/RS-422 Transceiver

The MAX485D is a rs-485/rs-422 transceiver from Analog Devices. View the full MAX485D datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

MAX485D shares its datasheet with MAX485, whose page lists every part number it covers.

Official MAX485D datasheet (PDF) — the source this page was extracted from.

Manufacturer

Analog Devices

MAX485D Key Specifications

Parameter	Value
No-Load Supply Current (I CC)	Typ 300 μA (DE = 0V, RE = 0V or V CC)
Driver Output Voltage (V OD2)	Min 1.5 V (R = 27Ω (RS-485))
Receiver Differential Threshold Voltage (V TH)	-0.2 V to 0.2 V (-7V ≤ V CM ≤12V)
Receiver Input Hysteresis (V TH)	Typ 70 mV (V CM = 0V)
Receiver Input Resistance (R IN)	Min 12 kΩ (-7V ≤ V CM ≤ 12V)
Driver Input to Output Propagation delay time (t PLH, t PHL)	Typ 30 ns, Max 60 ns (R DIFF = 54Ω)
Maximum Data Rate (f MAX)	2.5 Mbps
Driver Short-Circuit Current (I OSD1, I OSD2)	Min 35 mA, Max 250 mA (-7V ≤ V O ≤ 12V)

MAX485D Overview

Part: MAX485

Type: Low-Power RS-485/RS-422 Transceiver

Description: The MAX485 is a low-power transceiver for RS-485 and RS-422 communication, operating from a single 5V supply, supporting up to 2.5Mbps data rate, and allowing up to 32 transceivers on the bus.

Operating Conditions:

Supply voltage: 4.75–5.25 V
Operating temperature: 0 to +70 °C
Max data rate: 2.5 Mbps
Common-mode input voltage range: -7V to +12V

Absolute Maximum Ratings:

Max supply voltage: 12 V
Max junction/storage temperature: -65 to +160 °C

Key Specs:

No-Load Supply Current (I CC): Typ 300 μA (DE = 0V, RE = 0V or V CC)
Driver Output Voltage (V OD2): Min 1.5 V (R = 27Ω (RS-485))
Receiver Differential Threshold Voltage (V TH): -0.2 V to 0.2 V (-7V ≤ V CM ≤12V)
Receiver Input Hysteresis (V TH): Typ 70 mV (V CM = 0V)
Receiver Input Resistance (R IN): Min 12 kΩ (-7V ≤ V CM ≤ 12V)
Driver Input to Output Propagation delay time (t PLH, t PHL): Typ 30 ns, Max 60 ns (R DIFF = 54Ω)
Maximum Data Rate (f MAX): 2.5 Mbps
Driver Short-Circuit Current (I OSD1, I OSD2): Min 35 mA, Max 250 mA (-7V ≤ V O ≤ 12V)

Features:

Low Quiescent Current: 300μA
-7V to +12V Common-Mode Input Voltage Range
Three-State Outputs
30ns Propagation Delays, 5ns Skew
Operate from a Single 5V Supply
Allows up to 32 Transceivers on the Bus
Data rate: 2.5 Mbps
Current-Limiting and Thermal Shutdown for Driver Overload Protection
The transmitter outputs and receiver inputs are protected to ±15kV Air ESD

Applications:

Low-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks

Package:

SOP8L
DIP8L

MAX485D Features

Low Quiescent Current: 300μA
-7V to +12V Common-Mode Input Voltage Range
Three-State Outputs
30ns Propagation Delays, 5ns Skew
Operate from a Single 5V Supply
Allows up to 32 Transceivers on the Bus
Data rate: 2.5 Mbps
Current-Limiting and Thermal Shutdown for Driver Overload Protection
The transmitter outputs and receiver inputs are protected to ±15kV Air ESD

MAX485D Pin Configuration

MAX485D Electrical Characteristics

(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)

Parameter	Symbol	Test Conditions	Min	Max	Unit
Differential Driver Output (no load)	V OD1			5	V
Differential Driver Output (with load)	V OD2	R = 50Ω (RS-422)	2
Differential Driver Output (with load)	V OD2	R = 27Ω (RS-485), Figure 3	1.5	5	V
Change in Magnitude of Driver Differential Output Voltage for Complementary Output States	V OD	R = 27Ω or 50Ω, Figure 3		0.2	V
Driver Common-Mode Output Voltage	V OC	R = 27Ω or 50Ω, Figure 3		3	V
Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States	V OD	R = 27Ω or 50Ω, Figure 3		0.2	V
Input High Voltage	V IH	DE,DI, RE	2
Input Low Voltage	V IL	DE,DI, RE		0.8	V
Input Current	I INI	DE,DI, RE		±2	μA

MAX485D Absolute Maximum Ratings

Parameter	Symbol	Value	Unit
Supply Voltage	V CC	12V	V
Control Input Voltage	V CIV	-0.5 to (V CC +0.5)	V
Driver Input Voltage	DI	-0.5 to (V CC +0.5)	V
Driver Output Voltage (A, B)	DO	-8 to +12.5	V
Receiver Input Voltage (A, B)	V RIV	-8 to +12.5	V
Receiver Output Voltage	RO	-0.5 to (V CC +0.5)	V
8-Pin PlasticDIPContinuousPower Dissipation (derating9.09mW/°C above+70°C)	P DIP	727	mW
8-Pin SOP Continuous Power Dissipation (derating 5.88mW/°C above +70°C)	P SOP	471	mW
Operating Temperature Range	T A	0 to +70	R C
Storage Temperature Range	T STG	-65 to +160	R C
Lead Temperature, 10 sec	T L	+300	R C

MAX485D Typical Application

Figure 2. Typical Circuit

Figure 2. Typical Circuit

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All Interface ICs datasheets All Analog Devices datasheets (700)

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