MAXIM MAX3280E, MAX3281E, MAX3283E, MAX3284E User Manual

General Description

The MAX3280E/MAX3281E/MAX3283E/MAX3284E are single receivers designed for RS-485 and RS-422 communication. These devices guarantee data rates up to 52Mbps, even with a 3V power supply. Excellent propagation delay (15ns max) and package-to-package skew time (8ns max) make these devices ideal for multidrop clock distribution applications.

The MAX3280E/MAX3281E/MAX3283E/MAX3284E have true fail-safe circuitry, which guarantees a logichigh receiver output when the receiver inputs are opened or shorted. The receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). These devices feature 1/4-unit-load receiver input impedance, allowing up to 128 receivers on the same bus.

The MAX3280E is a single receiver available in a 5-pin SOT23 package. The MAX3281E/MAX3283E single receivers have a receiver enable (EN or EN) function and are offered in a 6-pin SOT23 package. The MAX3284E features a voltage logic pin that allows compatibility with low-voltage logic levels, as in digital FPGAs/ASICs. On the MAX3284E, the voltage threshold for a logic high is user-defined by setting VLin the range from 1.65V to V

. The MAX3284E is also

offered in a 6-pin SOT23 package.

Applications

Clock Distribution

Telecom Racks

Base Stations

Industrial Control

Local Area Networks

Features

♦ ESD Protection:

±15kV Human Body Model ±6kV IEC 1000-4-2, Contact Discharge ±12kV IEC 1000-4-2, Air-Gap Discharge

♦ Guaranteed 52Mbps Data Rate

♦ Guaranteed 15ns Receiver Propagation Delay

♦ Guaranteed 2ns Receiver Skew

♦ Guaranteed 8ns Package-to-Package Skew Time

♦ V

Pin for Connection to FPGAs/ASICs

♦ Allow Up to 128 Transceivers on the Bus

(1/4-unit-load)

♦ Tiny SOT23 Package

♦ True Fail-Safe Receiver

♦ -7V to +12V Common-Mode Range

♦ 3V to 5.5V Power-Supply Range

♦ Enable (High and Low) Pins for Redundant

Operation

♦ Three-State Output Stage (MAX3281E/MAX3283E)

♦ Thermal Protection Against Output Short Circuit

MAX3280E/MAX3281E/MAX3283E/MAX3284E

±15kV ESD-Protected 52Mbps, 3V to 5.5V, SOT23

RS-485/RS-422 True Fail-Safe Receivers

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-2320; Rev 1; 3/11

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations appear at end of data sheet.

Selector Guide

Note 1: MAX3284E data rate is dependent on VL.

Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

PART TEMP RANGE

MAX3280E AUK+T -40°C to +125°C 5 SOT23-5 ADVM

MAX3281EAUT+T -40°C to +125°C 6 SOT23-6 ABAT

MAX3283EAUT+T -40°C to +125°C 6 SOT23-6 ABAU

MAX3284EAUT+T -40°C to +125°C 6 SOT23-6 ABAV

PINPACKAGE

TOP

MARK

PART V

MAX3280E — — 52Mbps 5-Pin SOT23

MAX3281E — Active High 52Mbps 6-Pin SOT23

MAX3283E — Active Low 52Mbps 6-Pin SOT23

MAX3284E ✔ —

ENABLE DATA RATE PACKAGE

52Mbps (Note 1)

6-Pin SOT23

MAX3280E/MAX3281E/MAX3283E/MAX3284E

±15kV ESD-Protected 52Mbps, 3V to 5.5V, SOT23 RS-485/RS-422 True Fail-Safe Receivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= 3V to 5.5V, VL= VCC, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= 5V and TA= +25°C.) (Notes 2, 3)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

(All Voltages Referenced to GND) Supply Voltage (V

) ...............................................-0.3V to +6V

Control Input Voltage (EN, EN).................................-0.3V to +6V

Input Voltage .......................................................-0.3V to +6V

Receiver Input Voltage (A, B)..............................-7.5V to +12.5V

Receiver Output Voltage (RO)....................-0.3V to (V

+ 0.3V)

Receiver Output Voltage

(RO) (MAX3284E) .....................................-0.3V to (VL+ 0.3V)

Receiver Output Short-Circuit Current .......................Continuous

Continuous Power Dissipation (T

= +70°C)

5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW

6-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW

Operating Temperature Range

MAX328_EA__ ..............................................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow) .......................................+260°C

Supply Voltage VCC 3.0 5.5 V

Supply Current ICC No load 9 15 mA

VL Input Range VL MAX3284E 1.65 VCC V

VL Supply C urrent IL No load (MAX3284E) 10 μA

RECEIVER

Input Current (A and B) I

Receiver Differential Threshold Voltage

Receiver Input Hysteresis VTH VA + VB = 0V 25 mV

Receiver Enable Input Low V

Receiver Enable Input High V

Receiver Enable Input Leakage I

Receiver Output High Voltage V

Receiver Output Low Voltage V

Three-State Output Current at Receiver

Receiver Input Resistance RIN -7V  VCM +12V (Note 5) 48 k

Receiver Output Short-Circuit Current

ESD PROTECTION

ESD Protection (A, B)

PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS

VCC = V

A, B

-7V  VCM +12V (Note 4) -200 -125 -50 mV

MAX3281E, MAX3283E onl y 0.4 V

ENIL

MAX3281E, MAX3283E only 2 V

ENIH

MAX3281E, MAX3283E onl y ±10 μA

LEAK

MAX3280E/MAX3281E/MAX3283E, I

MAX3284E, IOH = -1mA, 1.65V  VL VCC, RO high

MAX3280E/MAX3281E/MAX3283E, I

MAX3284E, IOL = 1mA, 1.65V  VL VCC, RO low

0  VO VCC, RO = high impedance ±5 μA

0  VRO VCC ±130 mA

Human Body Model ±15

IEC1000-4-2 (Air-Gap Discharge) ±12

IEC1000-4-2 (Contact Discharge) ±6

OZR

OSR

GND

= -4mA, RO high

= 4mA, RO low

or 5.5V

VIN = +12V 250

= -7V -200

- 0.4

0.4

μA

MAX3280E/MAX3281E/MAX3283E/MAX3284E

±15kV ESD-Protected 52Mbps, 3V to 5.5V, SOT23

RS-485/RS-422 True Fail-Safe Receivers

_______________________________________________________________________________________ 3

SWITCHING CHARACTERISTICS

(VCC= 3V to 5.5V, VL= VCC, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= 5V and TA= +25°C.) (Notes 2, 3)

Typical Operating Characteristics

(VCC= 3.3V, TA = +25°C, unless otherwise noted.)

02010 30 40 50 60

RECEIVER OUTPUT LOW VOLTAGE

vs. OUTPUT CURRENT

MAX3280/1/3/4E toc01

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE (V)

VCC = 3.3V

VCC = 5V

-50 -30-40 -20 -10 0

RECEIVER OUTPUT HIGH VOLTAGE

vs. OUTPUT CURRENT

MAX3280/1/3/4E toc02

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE (V)

VCC = 3.3V

VCC = 5V

2.5

3.0

4.0

3.5

4.5

5.0

-50 0-25 25 50 75 100 125

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

MAX3280/1/3/4E toc03

TEMPERATURE (°C)

RECEIVER OUTPUT HIGH VOLTAGE (V)

VCC = 5V

VCC = 3.3V

VA = 1V, B = GND, IOH = -4mA

Note 2: Parameters are 100% production tested at +25°C, limits over temperature are guaranteed by design. Note 3: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device

ground, unless otherwise noted.

Note 4: V

is the common-mode input voltage. VIDis the differential input voltage.

Note 5: Not production tested. Guaranteed by design. Note 6: See Table 2 for MAX3284E data rates with V

< VCC.

PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS

Maximum Data Rate f

Receiver Propagation Delay

Receiver Output |t

PLH

- t

| t

PHL

Device-to-Device Propagation Delay Matching

ENABLE/DISABLE TIME FOR MAX3281E/MAX3283E

Receiver Enable to Output Low t

Receiver Enable to Output High t

Receiver Disable Time from Low t

Receiver Disable Time from High t

CL = 15pF (Notes 5, 6) 52 Mbps

MAX

Figure 1, CL = 15pF, VID = 2V, VCM = 0V 7 15

PLH

Figure 1, CL = 15pF, VID = 2V, VCM = 0V 8 15

PHL

Figure 1, CL = 15pF, TA = +25°C 2 ns

PSKEW

Same power supply, maximum temperature d ifference between

8 ns

devices = +30°C.

Figure 2, CL = 15pF 500 ns

PRZL

Figure 2, CL = 15pF 500 ns

PRZH

Figure 2, CL = 15pF 500 ns

PRLZ

Figure 2, CL = 15pF 500 ns

PRHZ

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