MAXIM MAX13442E, MAX13443E, MAX13444E Technical data

Selector Guide

General Description

The MAX13442E/MAX13444E are fault-protected RS-485 and J1708 transceivers that feature ±80V protection from signal faults on communication bus lines. The MAX13442E/MAX13444E feature a reduced slew-rate driver that minimizes EMI and reflections, allowing error-free transmission up to 250kbps. The MAX13443E driver can transmit up to 10Mbps. The high-speed MAX13443E RS-485 tranceiver features ±60V protection from signal faults on communication bus lines. These transceivers feature foldback current limit. 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. 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 MAX13442E/MAX13443E/MAX13444E are available in an 8-pin SO package and are specified over the automotive temperature range.

Applications

Features

♦ ±15kV ESD Protection

♦ ±80V Fault Protection (±60V MAX13443E)

♦ Guaranteed 10Mbps Data Rate (MAX13443E)

♦ Hot-Swappable for Telecom Applications

♦ True Fail-Safe Receiver Inputs

♦ Enhanced Slew-Rate-Limiting Facilitates

Error-Free Data Transmission (MAX13442E/MAX13444E)

♦ Allow Up to 128 Transceivers on the Bus

♦ -7V to +12V Common-Mode Input Range

♦ ±6mA FoldBack Current Limit

♦ Industry-Standard Pinout

MAX13442E/MAX13443E/MAX13444E

±15kV ESD-Protected, ±80V Fault-Protected,

Fail-Safe RS-485/J1708 Transceivers

________________________________________________________________

Maxim Integrated Products

1

Pin Configurations and Typical Operating Circuits

Ordering Information

19-3898; Rev 3; 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 and Typical Operating Circuits continued at end of data sheet.

RS-422/RS-485 Communications

Truck and Trailer Applications

Industrial Networks

Telecommunications Systems

Automotive Applications

HVAC Controls

+

Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. T = Tape and reel.

PART TEMP RANGE PIN-PACKAGE

MAX13442EASA+ -40°C to +125°C 8 SO

MAX13443EASA+ -40°C to +125°C 8 SO

MAX13444EASA/V+T -40°C to +125°C 8 SO

PART TYPE

MAX13442E RS-485 0.25 ±80 Yes Yes 128 Yes

MAX13443E RS-485 10 ±60 Yes Yes 128 Yes MAX13444E J1708 0.25 ±80 Yes Yes 128 Yes (only RE)

DATA RATE

(Mbps)

FAULT

PROTECTION

(V)

LOW-POWER

SHUTDOWN

RECEIVER/DRIVER

ENABLE

TRANSCEIVERS

ON BUS

HOT

SWAP

TOP VIEW

+

RO

RE

DE

DI

R

1

2

3

4

D

SO SO

V

8

CC

B

7

A

6

GND

5

+

RO

RE

DE

DI

R

1

2

3

4

D

8

V

CC

B

7

6

A

5

GND

MAX13442E MAX13443E

R

T

B

R

T

A

DE

D

R

RE

DI

RO

MAX13442E/MAX13443E/MAX13444E

±15kV ESD-Protected, ±80V Fault-Protected, 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

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

CC

+ 0.3V)

A, B (Note 1) (MAX13442E/MAX13444E) ............................±80V

A, B (Note 1) (MAX13443E) .................................................±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 7.6mW/°C above +70°C)...........................606mW

Operating Temperature Range .........................-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

PACKAGE THERMAL CHARACTERISTICS (Note 2)

SO

Junction-to-Ambient Thermal Resistance (θ

JA

) .........132°C/W

Junction-to-Case Thermal Resistance (θ

JC

) ................38°C/W

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: During normal operation, a termination resistor must be connected between A and B in order to guarantee overvoltage pro-

tection up to the absolute maximum rating of this device. When not in operation, these devices can withstand fault voltages up to the maximum rating without a termination resistor and will not be damaged.

Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial

.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

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 4)

Driver Short-Circuit Foldback Output Current

Driver-Limit Short-Circuit Foldback Output Current

Figure 1, RL = 100 2 V

OD

Figure 1, RL = 54 1.5 V

Figure 1, RL = 100 or 54 (Note 3) 0.2 V

V

OD

V

V

DIN

I

OSD

I

OSDF

I

OSDL

Figure 1, RL = 100 or 54 V

OC

Figure 1, RL = 100 or 54 (Note 3)

OC

(MAX13442E/MAX13443E)

2 V

DIH

0.8 V

DIL

±2 μA

0V  V

-7V  V

(VCC - 1V)  V

-7V  V

V

OUT

V

OUT

 +12V +350

OUT

 VCC -350

OUT

 +12V (Note 4) +25

OUT

 +1V (Note 4) -25

OUT

 +20V, RL = 100 +6

 -15V, RL = 100 -6

0.2 V

CC

/ 2 3 V

CC

V

mA

MAX13442E/MAX13443E/MAX13444E

±15kV ESD-Protected, ±80V Fault-Protected,

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.)

RECEIVER

Input Current I

Receiver-Differential Threshold Voltage

Receiver-Input Hysteresis VTH 25 mV

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 During First Rising Edge

SUPPLY CURRENT

Normal Operation I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

A, B receive

A,B

mode

V

-7V  VCM +12V -200 -50 mV

TH

I

0V  V

OZR

I

0V  VRO V

OSR

DE, DE, RE 2 V

CIH

I

DE, RE 90 μA

IN

No load, DI = V

CC

or GND

VCC = GND, V

V

= -7V -150

A, B

V

= ±80V ±6 mA

A, B

 V

A, B

CC

±1 μA

CC

DE = VCC, RE = GND (MAX13442E) (DE = RE = GND) (MAX13444E)

(DE = V

CC

(MAX13443E)

= 12V 250

A, B

30

, RE = GND)

10

μA

±95 mA

mA

Supply Current in Shutdown Mode I

Supply Current with Output Shorted to ±60V

SHDN

I

SHRT

DE = GND, RE = V (MAX13442E/MAX13443E)

DE = GND, RE = VCC, TA = +25°C (MAX13442E/MAX13443E)

DE = RE = VCC (MAX13444E) 100 DE = RE = VCC, TA = +25°C (MAX13444E) 10

DE = GND, RE = GND, no load output in three-state (MAX13443E)

CC

20

10

±15 mA

μA

MAX13442E/MAX13443E/MAX13444E

±15kV ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers

4 _______________________________________________________________________________________

SWITCHING CHARACTERISTICS (MAX13442E/MAX13444E)

(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.)

PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS

Overvoltage Protection

ESD Protection A, B Human Body Model ±15 kV

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Driver Propagation Delay

Driver Differential Propagation Delay

Driver Differential Output Transition Time

Driver Output Skew

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

Recei ver D i sab l e Ti m e fr om Outp ut H i g ht

Receiver Wake Time from Shutdown t

Receiver Enable Time to Output Low t

Recei ver D i sab l e Ti m e fr om Outp ut Low t

Receiver Time to Shutdown t

A, B; R

SOURCE

= 54

R

L

t

PLHA,

t

PLHB R

t

DPLH,

t

DPHL

t

LH,tHLRL

t

S KEWAB

t

S KEWBA

DSKEW

MAX

PDZH

PDHZ

t

PDHS

PDZL

PDLZ

t

PDLS

SHDN

t

RPLH

t

RPHL

RSKEWCL

RPZH

RPHZ

RPWAKERL

RPZL

RPLZ

SHDN

Figure 3, RL = 54Ω, CL = 50pF (MAX13442E)

DIFF

RL = 54Ω, CL = 50pF, Figure 4 2000 ns

= 54Ω, CL = 50pF, Figure 4 200 2000 ns

RL = 54Ω, CL = 50pF,

,

t

SKEWAB

t

SKEWBA

RL = 54Ω, CL = 50pF, t

DSKEW

RL = 500Ω, CL = 50pF, Figure 5 2000 ns

RL = 500Ω, CL = 50pF, Figure 5 4.2 µs

RL = 500Ω, CL = 50pF, Figure 6 2000 ns

RL = 500Ω, CL = 50pF, Figure 6 4.2 µs

RL = 500Ω, CL = 50p F 800 ns

,

C

= 20pF, V

L

= 20pF, t

RL = 1kΩ, C

RL = 1kΩ, CL = 20pF, Figure 8 2000 ns

= 1kΩ, CL = 20pF, Figure 8 4.2 µs

RL = 1kΩ, C

RL = 1kΩ, CL = 20pF, Figure 8 2000 ns

RL = 500Ω, CL = 50pF 800 ns

= 0,

= 60Ω, C

= |t = |t

= |t

DPLH

L

MAX13442E/ MAX13444E

MAX13443E ±60

= 100pF (MAX13444E)

DIFF

- t

PHLB

PHLA

DPHL

= |t

|, |

|

RPLH

- t

| 200 ns

RPHL

PLHA

PLHB

- t

= 2V, VCM = 0V, Figure 7 2000 ns

ID

RSKEW

= 20pF, Figure 8 2000 ns

±80

250 kbps

2000 ns

350 ns

200 ns

V

MAX13442E/MAX13443E/MAX13444E

±15kV ESD-Protected, ±80V Fault-Protected,

Fail-Safe RS-485/J1708 Transceivers

_______________________________________________________________________________________ 5

SWITCHING CHARACTERISTICS (MAX13443E)

(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 3: ΔV

OD

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

Note 4: The short-circuit output current applies to peak current just before foldback current limiting. The short-circuit foldback out-

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Driver Propagation Delay

Driver Differential Propagation Delay

Driver Differential Output Transition Time

Driver Output Skew

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

Recei ver D i sab l e Ti m e fr om Outp ut H i g ht

Receiver Wake Time from Shutdown t

Receiver Enable Wake Time from Shutdown

Recei ver D i sab l e Ti m e fr om Outp ut Low t

Receiver Time to Shutdown t

t

PLHA,

t

PLHB

t

DPLH,

t

DPHL

t

LH,tHLRL

t

SKEWAB

t

SKEWBA

DSKEW

MAX

PDZH

PDHZ

t

PDHS

PDZL

PDLZ

t

PDLS

SHDNRL

t

RPLH

t

RPHL

RSKEWCL

RPZH

RPHZ

RPWAKERL

t

RPSH

RPLZ

SHDNRL

RL = 27Ω, CL = 50pF, Figure 3 60 ns

RL = 54Ω, CL = 50pF, Figure 4 60 ns

= 54Ω, CL = 50pF, Figure 4 25 ns

RL = 54Ω, CL = 50pF,

,

t

SKEWAB

t

SKEWBA

= |t = |t

PLHA

PLHB

RL = 54Ω, CL = 50pF,

= |t

t

DSKEW

DPLH

RL = 500Ω, CL = 50pF, Figure 5 1200 ns

RL = 500Ω, CL = 50pF, Figure 5 4.2 µs

RL = 500Ω, CL = 50pF, Figure 6 1200 ns

RL = 500Ω, CL = 50pF, Figure 6 4.2 µs

,

C

RL = 1kΩ, C

= 500Ω, C

= 20pF, V

L

= 20pF, t

= 50p F, Figure 6 800 ns

L

ID

RSKEW

= 20pF, Figure 8 400 ns

L

RL = 1kΩ, CL = 20pF, Figure 8 400 ns

= 1kΩ, CL = 20pF, Figure 8 4.2 µs

RL = 1kΩ, C

= 20pF, Figure 8 400 ns

L

RL = 1kΩ, CL = 20pF, Figure 8 400 ns

= 500Ω, CL = 50pF 800 ns

10 ns

- t

PHLB

PHLA

DPHL

|, |

|

10 Mbps

= 2V, VCM = 0V, Figure 7 85 ns

= |t

RPLH

- t

|15ns

RPHL

MAX13442E/MAX13443E/MAX13444E

±15kV ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers

6 _______________________________________________________________________________________

Typical Operating Characteristics

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

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

MAX13442-4E toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1109580655035205-10-25

1

2

3

4

5

6

0

-40 125

DRIVER AND RECEIVER ENABLED

MAX13443E

DRIVER DISABLED, RECEIVER ENABLED

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

MAX13442-4E toc02

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1109580655035205-10-25

4

8

12

16

20

24

0

-40 125

DRIVER AND RECEIVER ENABLED

MAX13442E/MAX13444E

DRIVER DISABLED, RECEIVER ENABLED

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX13442-4E toc03

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT (μA)

120100806040200-20

0.00001

0.0001

0.001

0.01

0.1

1

10

0.000001

-40

MAX13442E DI = DE = GND RE = V

CC

0

10

5

15

30

35

25

20

40

0 1.0 1.5 2.0 2.50.5 3.0 3.5 4.0 4.5 5.0

RECEIVER OUTPUT CURRENT

vs. OUTPUT-LOW VOLTAGE

MAX13442-4E toc04

OUTPUT LOW VOLTAGE (V)

RECEIVER OUTPUT CURRENT (mA)

0

10

5

15

30

35

25

20

40

0 1.0 1.5 2.0 2.50.5 3.0 3.5 4.0 4.5 5.0

RECEIVER OUTPUT CURRENT

vs. OUTPUT-HIGH VOLTAGE

MAX13442-4E toc05

OUTPUT LOW VOLTAGE (V)

RECEIVER OUTPUT CURRENT (mA)

0

1.0

0.5

2.5

2.0

1.5

3.0

3.5

4.5

4.0

5.0

-40 -10 5-25 20 35 50 65 80 95 110 125

RECEIVER OUTPUT VOLTAGE

vs. TEMPERATURE

MAX13442-4E toc06

TEMPERATURE (°C)

RECEIVER OUTPUT VOLTAGE (V)

VOL, I

OUT

= -10mA

VOH, I

OUT

= 10mA

0

40

20

80

60

140

120

100

10 3020 40 50 60 70 80

DRIVER OUTPUT CURRENT

vs. DIFFERENTIAL OUTPUT VOLTAGE

MAX13442-4E toc07

DIFFERENTIAL OUTPUT VOLTAGE (V)

DRIVER OUTPUT CURRENT (mA)

MAX13442E DI = GND, DE = V

CC

, VOLTAGE APPLIED TO OUTPUT A

RL = 54Ω