MAXIM MAX3440E, MAX3444E User Manual

Selector Guide

General Description

The MAX3440E–MAX3444E fault-protected RS-485 and
J1708 transceivers feature ±60V protection from signal
faults on communication bus lines. Each device contains
one differential line driver with three-state output and one
differential line receiver with three-state input. The 1/4-unit­load receiver input impedance allows up to 128 trans­ceivers on a single bus. The devices operate from a 5V
supply at data rates of up to 10Mbps. True fail-safe inputs
guarantee a logic-high receiver output when the receiver
inputs are open, shorted, or connected to an idle data line.

Hot-swap circuitry eliminates false transitions on the
data bus during circuit initialization or connection to a
live backplane. Short-circuit current-limiting and ther­mal shutdown circuitry protect the driver against exces­sive power dissipation, and on-chip ± 15kV ESD
protection eliminates costly external protection devices.

The MAX3440E–MAX3444E are available in 8-pin SO
and PDIP packages and are specified over industrial
and automotive temperature ranges.

Applications

RS-422/RS-485 Communications
Truck and Trailer Applications
Industrial Networks
Telecommunications Systems
Automotive Applications
HVAC Controls

Features

♦ ±15kV ESD Protection

♦ ±60V Fault Protection

♦ Guaranteed 10Mbps Data Rate

(MAX3441E/MAX3443E)

♦ Hot Swappable for Telecom Applications

♦ True Fail-Safe Receiver Inputs

♦ Enhanced Slew-Rate-Limiting Facilitates

Error-Free Data Transmission
(MAX3440E/MAX3442E/MAX3444E)

♦ Allow Up to 128 Transceivers on the Bus

♦ -7V to +12V Common-Mode Input Range

♦ Automotive Temperature Range (-40°C to +125°C)

♦ Industry-Standard Pinout

MAX3440E–MAX3444E

±15kV ESD-Protected, ±60V Fault-Protected,

10Mbps, Fail-Safe RS-485/J1708 Transceivers

________________________________________________________________

Maxim Integrated Products

1

Pin Configurations and Typical Operating Circuits

Ordering Information

19-2666; Rev 2; 11/10

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.

+

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

Ordering Information continued at end of data sheet.

Pin Configurations and Typical Operating Circuits continued at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX3440EESA+ -40°C to +85°C 8 SO

MAX3440EEPA+ -40°C to +85°C 8 PDIP

MAX3440EASA+ -40°C to +125°C 8 SO

MAX3440EAPA+ -40°C to +125°C 8 PDIP

PART TYPE

MAX3440E RS-485 0.25 No Yes 128 Yes

MAX3441E RS-485 2.5 to 10 No Yes 128 Yes

MAX3442E RS-485 0.25 Yes Yes 128 Yes

MAX3443E RS-485 2.5 to 10 Yes Yes 128 Yes
MAX3444E J1708 0.25 Yes Yes 128 Yes (only RE)

DATA RATE

(Mbps)

LOW-POWER

SHUTDOWN

RECEIVER/DRIVER

ENABLE

TRANSCEIVERS

ON BUS

HOT SWAP

TOP VIEW

FAULT

DE/RE

+

1

RO

DI

R

2

3

4

D

DIP/SO DIP/SO

FAULT

V

8

CC

B

7

A

DE/RE

6

GND

5

+

1

RO

DI

R

2

3

4

D

8

V

CC

B

7

Rt

6

A

5

GND

MAX3440E
MAX3441E

B

Rt

A

R

DE/RE

D

FAULT

DI

RO

MAX3440E–MAX3444E

±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

Voltages Referenced to GND
V

CC

........................................................................................+7V

FAULT, DE/RE, RE, DE, DE, DI, TXD..........-0.3V to (V

CC

+ 0.3V)

A, B (Note 1) ........................................................................±60V

RO ..............................................................-0.3V to (V

CC

+ 0.3V)

Short-Circuit Duration (RO, A, B) ...............................Continuous

Continuous Power Dissipation (T

A

= +70°C)

SO (derate 5.9mW/°C above +70°C)...........................471mW

PDIP (derate 9.09mW/°C above +70°C)......................727mW

Operating Temperature Ranges

MAX344_EE_ _ ...............................................-40°C to +85°C

MAX344_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

DC ELECTRICAL CHARACTERISTICS

(VCC= +4.75V to +5.25V, TA= T

MIN

to T

MAX

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

Note 1: A, B must be terminated with 54Ω or 100Ω to guarantee ±60V fault protection.

DRIVER

Differential Driver Output V

Change in Magnitude of
Differential Output Voltage

Driver Common-Mode
Output Voltage

Change in Magnitude of
Common-Mode Voltage

DRIVER LOGIC

Driver Input High Voltage V

Driver Input Low Voltage V

Driver Input Current I

Driver Short-Circuit Output Current
(Note 3)

Driver Short-Circuit Foldback
Output Current

RECEIVER

Input Current I

Receiver Differential Threshold
Voltage

Receiver Input Hysteresis VTH 25 mV

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Figure 1, RL = 100 2 V

OD

Figure 1, RL = 54 1.5 V

V

Figure 1, RL = 100 or 54 (Note 2) 0.2 V

OD

V

V

DIN

I

OSD

I

OSDF

A,B

V

Figure 1, RL = 100 or 54 V

OC

Figure 1, RL = 100 or 54 (Note 2) 0.2 V

OC

2 V

DIH

0.8 V

DIL

±2 μA

0V  V

OUT

-7V  V

OUT

(VCC - 1V)  V

-7V  V

OUT

VCC = GND, V

A, B

-7V  VCM +12V -200 -50 mV

TH

V

V

A, B

A, B

CC

CC

/ 2 3 V

CC

 +12V +350

 VCC -350

 +12V (Note 3) +25

OUT

 +1V (Note 3) -25

= 12V 250

A, B

= -7V -150

= ±60V ±6 mA

V

mA

mA

μA

MAX3440E–MAX3444E

±15kV ESD-Protected, ±60V Fault-Protected,

10Mbps, Fail-Safe RS-485/J1708 Transceivers

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +4.75V to +5.25V, TA= T

MIN

to T

MAX

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

PROTECTION SPECIFICATIONS

(VCC= +4.75V to +5.25V, TA= T

MIN

to T

MAX

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

RECEIVER LOGIC

Output High Voltage VOH Figure 2, IOH = -1.6mA VCC - 0.6 V

Output Low Voltage VOL Figure 2, IOL = 1mA 0.4 V

Three-State Output Current at
Receiver

Receiver Input Resistance RIN -7V  VCM +12V 48 k

Receiver Output Short-Circuit
Current

CONTROL

Control Input High Voltage V

Input Current Latch Dur ing First
Rising Edge

SUPPLY CURRENT

Normal Operation I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

I

0V  V

OZR

I

0V  VRO V

OSR

DE, DE, RE, DE/RE 2 V

CIH

I

DE, DE/RE, RE 90 μA

IN

No load,
DI = V

Q

or GND

 V

A, B

CC

±1 μA

CC

CC

MAX3440E (DE/RE = VCC),
MAX3442E (DE = V
RE = GND),
MAX3444E (DE = RE = GND)

MAX3441E (DE/RE = V
MAX3443E (DE = V
RE = GND)

CC

CC

,

),

CC

,

30

10

±95 mA

mA

Supply Current in Shutdown Mode I

Supply Current with Output Shorted
to ±60V

SHDN

I

SHRT

DE = GND, RE = VCC (MAX3442E/
MAX3443E)

DE = GND, RE = VCC, TA = +25°C
(MAX3442E/MAX3443E)

DE = RE = VCC (MAX3444E) 100
DE = RE = VCC, TA = +25°C (MAX3444E) 10

DE = GND, RE = GND, no load
output in three-state (MAX3443E)

20

10

±15 mA

μA

Overvoltage Protection A, B; R

ESD Protection A, B Human Body Model ±15 kV

FAULT DETECTION

Receiver Differential Threshold F

Receiver Differential Threshold F

Fault-Detect ion Common-Mode
Input Voltage Positive

Fault-Detect ion Common-Mode
Input Voltage Negative

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SOURCE

VCM = 0V, high limit 270 450 mV

DIPH

VCM = 0V, low limit -450 -270 mV

DIPL

12 V

-7 V

= 0, RL = 54 ±60 V

MAX3440E–MAX3444E

±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers

4 _______________________________________________________________________________________

SWITCHING CHARACTERISTICS (MAX3440E/MAX3442E/MAX3444E)

(VCC= +4.75V to +5.25V, TA= T

MIN

to T

MAX

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

PARAMETER SY MBOL CONDITIONS MIN TYP MAX UNITS

Driver Propagation Dela y

Driver Differential Propagation Delay

Driver Differential Output
Transit ion T ime

Driver Output S kew

Differential Driver Output Skew t

Maximum Data Rate f

Driver Enable Time to Output High t

Driver Disable Time from Output High t

Driver Enable Time from Shutdown to
Output High

Driver Enable Time to Output Low t

Driver Disable Time from Output Low t

Driver Enable Time from Shutdown to
Output Low

Driver Time to Shutdown t

Receiver Propagation Delay

Receiver Output Skew t

Receiver Enable Time to Output High t

Receiver Disable Time from Output
High

Receiver Wake Time from Shutdown t

Receiver Enable Time to Output Low t

Receiver Disable Time from Output Low t

Receiver Time to Shutdown t

t

PLHA,

t

PLHB

t

DPLH,

t

DPHL

t

LH,tHL

t

SKEWAB

t

SKEWBA

DSKEW

MAX

PDZH

PDHZ

t

PDHS

PDZL

PDLZ

t

PDLS

SHDN

t

RPLH

t

RPHL

RSKEW

RPZH

t

RPHZ

RPWAKE

RPZL

RPLZ

SHDN

MAX3440E/MAX3442E,
Figure 3, R

MAX3444E, R

= 54, CL = 50pF

L

= 60, C

DIFF

DIFF

= 100pF

Figure 4, RL= 54, CL= 50pF 2000 ns

Figure 4, RL = 54, CL= 50pF 200 2000 ns

RL = 54, CL= 50pF,

,

t

SKEWAB

t

SKEWBA

= |t
= |t

PLHA

PLHB

- t

- t

PHLB

PHLA

|,
|

RL = 54, CL= 50pF,
t

DSKEW

= |t

DPLH

- t

DPHL

|

250 kbp s

Figure 5, RL = 500, CL= 50pF 2000 ns

Figure 5, RL = 500, CL= 50pF 2000 ns

Figure 5, RL = 500, CL= 50pF
(MAX3442E/MAX3444E)

Figure 6, RL = 500, CL= 50pF 2000 ns

Figure 6, RL = 500, CL= 50pF 2000 ns

Figure 6, RL = 500, CL= 50pF
(MAX3442E/MAX3444E)

RL = 500, CL = 50pF (MAX3442E/MAX3444E) 800 ns

,

Figure 7, CL= 20pF, VID= 2V, VCM = 0V 2000 ns

CL = 20pF, t

RSKEW

= |t

RPLH

- t

| 200 ns

RPHL

Figure 8, RL = 1k, CL= 20pF 2000 ns

Figure 8, RL= 1k, CL= 20pF 2000 ns

Figure 8, RL = 1k, CL = 20pF
(MAX3442E/MAX3444E)

Figure 8, RL = 1k, CL= 20pF 2000 ns

Figure 8, RL = 1k, CL = 20pF 2000 ns

RL = 500, CL= 50pF
(MAX3442E/MAX3444E)

2000 ns

350 ns

200 ns

4.2 μs

4.2 μs

4.2 μs

800 ns

MAX3440E–MAX3444E

±15kV ESD-Protected, ±60V Fault-Protected,

10Mbps, Fail-Safe RS-485/J1708 Transceivers

_______________________________________________________________________________________ 5

SWITCHING CHARACTERISTICS (MAX3441E/MAX3443E)

(VCC= +4.75V to +5.25V, TA= T

MIN

to T

MAX

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

Note 2: ΔV

OD

and ΔVOCare the changes in VODand VOC, respectively, when the DI input changes state.

Note 3: The short-circuit output current applies to peak current just before foldback current limiting; the short-circuit foldback output

current applies during current limiting to allow a recovery from bus contention.

PARAMETER SY MBOL CONDITIONS MIN TYP MAX UNITS

Driver Propagation Dela y

Driver Differential Propagation Delay

Driver Differential Output
Transit ion T ime

Driver Output S kew

Differential Driver Output Skew t

Maximum Data Rate f

Driver Enable Time to Output High t

Driver Disable Time from Output High t

Driver Enable Time from Shutdown to
Output High

Driver Enable Time to Output Low t

Driver Disable Time from Output Low t

Driver Enable Time from Shutdown to
Output Low

Driver Time to Shutdown t

Receiver Propagation Delay

Receiver Output Skew t

Receiver Enable Time to Output High t

Receiver Disable Time from Output
High

Receiver Wake Time from Shutdown t

Receiver Enable Wake Time from
Shutdown

Receiver Disable Time from Output Low t

Receiver Time to Shutdown t

t

PLHA,

t

PLHB

t

DPLH,

t

DPHL

t

LH,tHL

t

SKEWAB

t

SKEWBA

DSKEW

MAX

PDZH

PDHZ

t

PDHS

PDZL

PDLZ

t

PDLS

SHDN

t

RPLH

t

RPHL

RSKEW

RPZH

t

RPHZ

RPWAKE

t

RPSH

RPLZ

SHDN

Figure 3, RL = 27, CL = 50pF 60 ns

Figure 4, RL= 54, CL= 50pF 60 ns

Figure 4, RL = 54, CL= 50pF 25 ns

RL = 54, CL= 50pF,

,

t

SKEWAB

t

SKEWBA

= |t
= |t

PLHA

PLHB

- t

- t

PHLB

PHLA

|,
|

RL = 54, CL= 50pF,
t

DSKEW

= |t

DPLH

- t

DPHL

|

10 Mbps

Figure 5, RL = 500, CL= 50pF 1200 ns

Figure 5, RL = 500, CL= 50pF 1200 ns

Figure 5, RL = 500, CL= 50pF (MAX3443E) 4.2 μs

Figure 6, RL = 500, CL= 50pF 1200 ns

Figure 6, RL = 500, CL= 50pF 1200 ns

Figure 6, RL = 500, CL= 50pF (MAX3443E) 4.2 μs

Figure 6, RL = 500, CL= 50pF (MAX3443E) 800 ns

,

Figure 7, CL= 20pF, VID= 2V, VCM = 0V 85 ns

CL = 20pF, t

RSKEW

= |t

RPLH

- t

Figure 8, RL = 1k, CL= 20pF 400 ns

Figure 8, RL= 1k, CL= 20pF 400 ns

Figure 8, RL = 1k, CL= 20pF (MAX3443E) 4.2 μs

Figure 8, RL = 1k, CL= 20pF 400 ns

Figure 8, RL = 1k, CL= 20pF 400 ns

RL = 500, CL= 50pF (MAX3443E) 800 ns

10 ns

10 ns

| 15 ns

RPHL

MAX3440E–MAX3444E

±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= +5V, TA = +25°C, unless otherwise noted.)

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

MAX3440E toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1109580655035205-10-25

1

2

3

4

5

6

0

-40 125

DRIVER AND RECEIVER
ENABLED

MAX3441E/MAX3443E

DRIVER DISABLED,
RECEIVER ENABLED

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

MAX3440E toc02

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1109580655035205-10-25

4

8

12

16

20

24

0

-40 125

MAX3440E/MAX3442E/MAX3444E

DRIVER AND RECEIVER
ENABLED

DRIVER DISABLED,
RECEIVER ENABLED

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX3443E toc03

TEMPERATURE (°C)

SUPPLY CURRENT (μA)

1109580655035205-10-25

0.1

1

10

0.01

-40 125

MAX3442E/MAX3443E/MAX3444E

A, B CURRENT

vs. A, B VOLTAGE (TO GROUND)

MAX3443E toc09

A, B VOLTAGE (V)

A, B CURRENT (μA)

4030 6050-50

-40

-30 -10 0 10-20 20

-800

-400

-1600

-2000

RL = 54Ω

-1200

0

400

800

1200

1600

2000

-60

DRIVER DISABLED,
RECEIVER ENABLED

RECEIVER OUTPUT CURRENT

40

35

30

25

20

15

10

RECEIVER OUTPUT CURRENT (mA)

vs. OUTPUT LOW VOLTAGE

5

0

0

1.5 2.5 3.0 3.52.0 4.0

1.0
OUTPUT LOW VOLTAGE (V)

MAX3443E toc04

5.04.50.5

DRIVER OUTPUT CURRENT

vs. DIFFERENTIAL OUTPUT VOLTAGE

80

70

60

50

40

30

20

DRIVER OUTPUT CURRENT (mA)

10

0

0.5

0

1.0

DIFFERENTIAL OUTPUT VOLTAGE (VA - VB) (V)

1.5 2.5 3.0 3.52.0

MAX3443E toc07

RECEIVER OUTPUT CURRENT

vs. OUTPUT HIGH VOLTAGE

40

35

30

25

20

15

10

RECEIVER OUTPUT CURRENT (mA)

5

0

0

1.5 2.5 3.0 3.52.0 4.0

1.0
OUTPUT HIGH VOLTAGE (V)

DIFFERENTIAL OUTPUT VOLTAGE

vs. TEMPERATURE

3.5

3.0

RL = 100Ω

2.5

2.0
RL = 54Ω

1.5

1.0

DIFFERENTIAL OUTPUT VOLTAGE (V)

0.5

MAX3441E/MAX3443E

0

-40 125
TEMPERATURE (°C)

RECEIVER OUTPUT VOLTAGE

vs. TEMPERATURE

5.0

4.5

MAX3443E toc05

4.0

3.5

3.0

2.5

2.0

1.5

RECEIVER OUTPUT VOLTAGE (V)

1.0

0.5

5.04.50.5

MAX3443E toc08

1109565 80-10 5 20 35 50-25

VOH, I

= +10mA

OUT

VOL, I

= -10mA

OUT

0

-40 125
TEMPERATURE (°C)

MAX3443E toc06

1109565 80-10 5 20 35 50-25