MAX3085

Product Catgories

Short Description:

The MAX3085 is a half-duplex high speed transceiver for RS-485 and RS422 communication. IC contains one driver and one receiver. The MAX3085 has a fail-safe circuit, ensure logical high level of receiver output when receiver input is open or short. It can achieve error-free data transmission of up to 500kbps. The MAX3085 receiver has 1/8 unit load input impedance, allows up to 256 devices can be attached to the bus.

Tags: Communication circuit, RS-485 Transceivers, Transceiver IC

Product Detail

Features

ESD protection：+15kV HBM
Fractional unit load allows up to 256 devices on the bus
+ 5V operating voltage
Data transmission up to 1Mbps
Tri-state output
SOP8 and DIP8 package

Application

RS-485/RS-422 transceiver
Industrial process control
Electric meter
Industrial motor drive
Automatic HVAC system

Parameter table

Order Information

Part No	Package	Manner of Packing	Devices per bag/reel
MAX3085	SOP8	Reel	4000

Pin Description

Pin No.	Pin Name	Description	I/O
1	RO	Receiver output：If A-B≥-0.05V，RO will be high；If A-B≤-0.2V，RO will be low；If A and B are open or shorted，RO will be high.	O
2	RE	Receiver output enable：RO is enabled when RE is low；RO is high impedance when RE is high.	I
3	DE	Driver output enable：The driver outputs，A and B are enabled by bringing DE high. They are high impedance when DE is low.	I
4	DI	Driver input：A low on DI forces output A low and output B high. Similarly, a high on DI forces output A high and output B low.	I
5	GND	Ground
6	A	Receiver input and driver output	I/O
7	B	Receiver input and driver output	I/O
8	VDD	Supply voltage

Truth Table

Input			Output
RE	DE	A – B	RO
L	X	≥-0.05V	H
L	X	≤-0.2V	L
L	X	Open/shorted	H
H	H	X	Z
H	L	X	Z

Truth Table

Input			Output
RE	DE	DI	B	A
X	H	H	L	H
X	H	L	H	L
L	L	X	Z	Z
H	L	X	Z

Absolute Maximum Ratings

Parameter	Symbol	Value	Unit
Supply Voltage	V DD	-0.5~6	V
Input Voltage	V IN	-0.5~6	V
Output Voltage	V OUT	GND-0.3~V +0.3 DD	V
A/B Input / Output Voltage	V /V INA/B OUTA/B	-7~12	V
Operating Temperature	T amb	-40~85	℃
Storage Temperature	T stg	-65~150	℃
Soldering Temperature(10s)	T sol	300	℃

Electrical Characteristics

Parameter	Symbol	Test Conditions		Min	Typ	Max	Unit
Driver
Differential driver output	V OD1	No load				5	V
Differential driver output	V OD2	R=50Ω or 27Ω(1)		2.0	3.0		V
Change in magnitude of driver differential output voltage for complementary output states	ΔV OD	R=50Ω or 27Ω(1)				0.2	V
Driver common-mode output voltage	V OC	R=50Ω or 27Ω(1)			V / DD 2	3	V
Change in magnitude of driver common-mode output voltage for complementary output states	ΔV OC	R=50Ω or 27Ω(1)				0.2	V
Input high voltage	V IH1	DE、RE、DI		2.0			V
Input low voltage	V IL1	DE、RE、DI				0.8	V
Input current	I IN1	DE、RE、DI				±2	A
Input current (A, B)	I IN2	DE=GND，V = 5V CC	Vin=5V		40	90	A
			Vin=-0V		60	100	A
Receiver
Differential threshold voltage	V TH	-7V≤V ≤12V CM		-250		-10	mV
input hysteresis voltage	ΔV TH				25		mV
output high voltage	V OH	I =-4mA O		V – CC 1.5			V
output low voltage	V OL	I =4mA O				0.4	V
3-state(high impedance) output current at receiver	I OZR	0.4V≤V ≤2.4V O			1		A
input resistance	R IN	-7V≤V ≤12V CM		96			kΩ
Receiver short-circuit current	I OSR	0V≤V ≤V RO DD			80		mA
Supply Current	I CC	No load，RE=DI =GND or V DD	DE=V DD		480	800	A
			DE=GND		450	700	A
ESD Protection（A/B）	ESD	Human Body Model		15			kV

Electrical Characteristics

Parameter	Symbol	Test Conditions	Min.	Typ.	Max.	Unit
Driver Input to Output	t DPLH	R =50Ω，DIFF C =C =100pF(3)(6) L1 L2	250		1000	ns
Driver Input to Output	t DPHL	R =50Ω，DIFF C =C =100pF(3)(6) L1 L2	250		1000	ns
\|t -t \| DPLH DPHL	t DSKEW	R =50Ω，DIFF CL1=CL2=100pF(3)(6)		-3	±100	ns
Driver Rise or Fall Time	t, t DR DF	R =50Ω，DIFF C =C =100pF(3)(6) L1 L2	200		750	ns
Maximum Data Rate	f MAX			1		Mbps
Driver Enable to Output High	t DZH	C =100pF，S2 closed(4)(7) L			2500	ns
Driver Enable to Output Low	t DZL	C =100pF，S1 closed(4)(7) L			2500	ns
Driver Disable Time from Low	t DLZ	C =15pF，S1 closed(4)(7) L			100	ns
Driver Disable Time from Low	t DHZ	C =15pF，S2 closed(4)(7) L			100	ns
Receiver Input to Output	t RPLH	\|V \|≥2.0V ID Rise or Fall Time≤15ns(5)(8)			200	ns
Receiver Input to Output	t RPHL				200	ns
\|t -t \| RPLH RPHL	t RSKD	\|V \|≥2.0V ID Rise or Fall Time≤15ns(5)(8)		3	30	ns
Receiver Enable to Output Low	t RZL	C =100pF，S1 closed(2)(9) L		20	50	ns
Receiver Enable to Output High	t RZH	C =100pF，S2 closed(2)(9) L		20	50	ns
Receiver Disable Time from Low	t RLZ	C =100pF，S1 closed(2)(9) L		20	50	ns
Receiver Disable Time from High	t RHZ	C =100pF，S2 closed(2)(9) L		20	50	ns

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Short Description:

Product Detail

Parameter table

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MAX3085

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Short Description:

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