Rainbow Electronics MAX14770E User Manual

19-5017; Rev 0; 10/09

Functional Diagram

High-ESD Profibus RS-485 Transceiver

General Description

The MAX14770E is a half-duplex, Q35kV high ESD­protected transceiver for PROFIBUS-DP and RS-485
applications. In addition, it can be used for RS-422/V.11
communications. The MAX14770E is designed to meet
IEC 61158-2, TIA/EIA-422-B, TIA/EIA-485-A, V.11, and
X.27 standards.

The MAX14770E operates from a +5V supply and has
true fail-safe circuitry that guarantees a logic-high receiv­er output when the receiver inputs are open or shorted.

The MAX14770E features a 1/4 standard-unit load
receiver input impedance, allowing up to 128 1/4 unit
load transceivers on the bus. Drivers are short-circuit
current limited and are protected against excessive
power dissipation by thermal-shutdown circuitry.

The MAX14770E is available in 8-pin SO and tiny TDFN
(3mm x 3mm) packages, and is specified over the extend­ed (-40NC to +85NC) and automotive (-40NC to +125NC)
temperature ranges.

MAX14770E

Features

S Meets EIA 61158-2 Type 3 PROFIBUS-DP

S +4.5V to +5.5V Supply Voltage

S 20Mbps Data Rate

S Short-Circuit Protected

S True Fail-Safe Receiver

S Thermal-Shutdown Protected

S Hot Swappable

S High ESD Protection

±35kV Human Body Model (HBM)

±20kV IEC 61000-4-2 Air Gap

±10kV IEC 61000-4-2 Contact

S -40NC to +125NC Automotive Temperature Range

in Tiny 8-Pin (3mm x 3mm) TDFN

Ordering Information

Applications

PROFIBUS-DP Networks

Industrial Fieldbuses

Motion Controllers

RS-485 Networks

Machine Encoders

Typical PROFIBUS-DP Operating Circuit appears at end of
data sheet.

PART TEMP RANGE

MAX14770EESA+T
MAX14770EATA+T

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

T = Tape and reel.
*EP = Exposed pad.

RO

RE

DE

DI

-40NC to +85NC

-40NC to +125NC

R

SHUTDOWN

D

MAX14770E

PIN-

PACKAGE

8 SO —

8 TDFN-EP* BMG

A

B

TOP

MARK

The PROFI BUS PROCESS FIELD BUS logo is a registered
trademark of PROFIBUS and PROFINET International (PI).

_______________________________________________________________ Maxim Integrated Products 1

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.

High-ESD Profibus RS-485 Transceiver

ABSOLUTE MAXIMUM RATINGS

(Voltages referenced to GND.)

VCC .......................................................................-0.3V to +6.0V

RE, RO .......................................................-0.3V to (V

DE, DI ...................................................................-0.3V to +6.0V

A, B .....................................................................-8.0V to +13.0V

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

Continuous Power Dissipation (TA = +70NC)

8-Pin SOIC (derate 7.6mW/NC above +70NC) ............606mW

8-Pin TDFN (derate 24.4mW/NC above +70NC) ........1951mW

Junction-to-Ambient Thermal Resistance (BJA) (Note 1)

MAX14770E

8-Pin SO ....................................................................132NC/W

8-Pin TDFN ..................................................................41NC/W

Note 1: 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/thermal-tutorial.

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.

CC

+ 0.3V)

ELECTRICAL CHARACTERISTICS

(VCC = +5V Q10%, TA = T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Range V

Supply Current I

Shutdown Supply
Current

DRIVER

Differential Driver
Output

Differential Driver
Peak-to-Peak Output

Change in Magnitude
of Differential Output
Voltage

Driver Common­Mode Output Voltage

Change in Common­Mode Voltage

Driver Short-Circuit
Output Current
(Note 5)

Driver Short-Circuit
Foldback Output
Current (Note 5)

MIN

to T

CC

I

SH

|VOD|

V

ODPP

DV

V

DV

I

OSD

I

OSDF

, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)

MAX

CC

DE = 1, RE = 0 or
DE = 0, RE = 0 or
DE = 1, RE = 1; no load

DE = 0, RE = 1

OD

OC

OC

RL = 54I, V

Figure 2 (Note 3) 4.0 6.8 V

RL = 54I; Figure 1 (Note 4)

RL = 54I; Figure 1

RL = 54I; Figure 1 (Note 4)

0V P V

OUT

-7V P V

(VCC - 1V) P V

-7V P V

= VCC or GND; Figure 1

DI

P +12V; output low

P VCC; output high

OUT

P +12V; output low

OUT

P +1V; output high

OUT

Junction-to-Case Thermal Resistance (BJC) (Note 1)

8-Pin SO ......................................................................38NC/W

8-Pin TDFN ....................................................................8NC/W

Operating Temperature Range

8-Pin SO ......................................................... -40NC to +85NC

8-Pin TDFN ................................................... -40NC to +125NC

Storage Temperature Range ............................ -65NC to +150NC

Junction Temperature Range ........................... -40NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

4.5 5.5 V

2.5 4 mA

15

2.1 V

-0.2 0 +0.2 V

1.8 3 V

-0.2 +0.2 V

+250

-250

-15

+15

FA

mA

mA

2 ______________________________________________________________________________________

High-ESD Profibus RS-485 Transceiver

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +5V Q10%, TA = T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LOGIC INPUTS

Driver Input High
Voltage

Driver Input Low
Voltage

Driver Input
Hysteresis

Driver Input Current I

Input Impedance in
Hot Swap

RECEIVER

Input Current (A, B) I

Differential Input
Capacitance

Receiver Differential
Threshold Voltage

Receiver Input
Hysteresis

LOGIC OUTPUT

Output High Voltage V

Output Low Voltage V

Three-State Receiver
Output Current

Receiver Input
Resistance

Receiver Output
Short-Circuit Current

PROTECTION SPECIFICATIONS

Thermal-Shutdown
Threshold

Thermal-Shutdown
Hysteresis

ESD Protection, A
and B Pins

ESD Protection, All
Other Pins

MIN

to T

V

V

V

HYS

IN

R

DE

R

A, IB

C

V

TH

DV

OH

OL

I

OZR

R

I

OSR

V

V

TSH

, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)

MAX

IH

IL

DE, DI, RE

DE, DI, RE

2.0 V

DE, DI, RE

DE, DI, RE

-1 +1

Figure 11 until the first low-to-high transition of DE
occurs

1 5.6 10

RE

AB

TH

IN

TS

Figure 11 until the first high-to-low transition of RE
occurs

DE = GND, VCC = GND or
+5.5V

VIN = 12V +250
VIN = -7V -200

Between A and B, DE = RE = GND at 6MHz

-7V P VCM P 12V

-200 -125 -50 mV

VCM = 0V 15 mV

I

= -1mA, VA - VB = V

OUT

I

= 1mA, VA - VB = -V

OUT

0V P V

OUT

P V

CC

-7V P VCM P 12V

0V P VRO P V

CC

TH

TH

VCC -

1.5

-1 +1

48

-110 +110 mA

HBM

IEC 61000-4-2 Contact Discharge to GND

HBM

0.8 V

50 mV

8 pF

0.4 V

+160

15

±35
±20
±10

±2

MAX14770E

FA

kW

FA

V

FA

kI

NC

NC

kVIEC 61000-4-2 Air-Gap Discharge to GND

kV

_______________________________________________________________________________________ 3

High-ESD Profibus RS-485 Transceiver

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +5V Q10%, TA = T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DRIVER SWITCHING CHARACTERISTICS

Driver Propagation
Delay

Differential Driver
Output Skew |t

- t

|

DPHL

MAX14770E

Driver Output
Transition Skew
|t

|, |t

t(MLH)

Driver Differential
Output Rise or Fall
Time

Maximum Data Rate

Driver Enable to
Output High

Driver Enable to
Output Low

Driver Disable Time
from Low

Driver Disable Time
from High

Driver Enable Skew
Time

Driver Disable Skew
Time

Driver Enable from
Shutdown to Output
High

Driver Enable from
Shutdown to Output
Low

Time to Shutdown t

RECEIVER SWITCHING CHARACTERISTICS

Receiver Propagation
Delay

Receiver Output
Skew

t(MHL)

DPLH

|

to T

MIN

t

DPLH

t

DPHL

t

DSKEW

t

TSKEW

tLH, t

HL

t

DZH

t

DZL

t

DLZ

t

DHZ

|t

- tZH|

ZL

|t

- tHZ|

LZ

t

DZL(SHDN)

t

DZH(SHDN)

SHDN

t

RPLH

t

RPHL

t

RSKEW

, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)

MAX

RL = 54I, CL = 50pF; Figures 3 and 4

RL = 54I, CL = 50pF; Figures 3 and 4

RL = 54I, CL = 50pF; Figures 3 and 5

RL = 54I, CL = 50pF; Figures 3 and 4

20 Mbps

RL = 500I, CL = 50pF; Figure 6

RL = 500I, CL = 50pF; Figure 7

RL = 500I, CL = 50pF; Figure 7

RL = 500I, CL = 50pF, Figure 6

RL = 500I, CL = 50pF; Figures 6 and 7

RL = 500I, CL = 50pF; Figures 6 and 7

RL = 500I, CL = 50pF; Figure 7 (Note 6)

RL = 500I, CL = 50pF; Figure 6 (Note 6)

(Note 6) 50 800 ns

CL = 15pF; Figures 8 and 9 (Note 7) 28 ns

CL = 15pF; Figures 8 and 9 (Notes 7, 8) 2 ns

1.2 ns

2 ns

28 ns

15 ns

50 ns

50 ns

40 ns

40 ns

8 ns

8 ns

100

100

Fs

Fs

4 ______________________________________________________________________________________

High-ESD Profibus RS-485 Transceiver

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +5V Q10%, TA = T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Maximum Data Rate 20 Mbps

Receiver Enable to
Output High

Receiver Enable to
Output Low

Receiver Disable
Time from Low

Receiver Disable
Time from High

Receiver Enable from
Shutdown to Output
High

Receiver Enable from
Shutdown to Output
Low

Time to Shutdown t

Note 2: Devices are production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design.
Note 3: V
Note 4: DVOD and DVOC are the changes in |VOD| and |VOC|, respectively, with the DI at high and DI at low.
Note 5: The short-circuit output current applies to peak current just prior to foldback current limiting; the short-circuit foldback out-

Note 6: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the device

Note 7: Capacitive load includes test probe and fixture capacitance.
Note 8: Guaranteed by characterization, not production tested.

is the difference in VOD, with the DI at high and DI at low.

ODPP

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

is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 800ns, the device is guaranteed to
have entered shutdown.

to T

MIN

t

RZH

t

RZL

t

RLZ

t

RHZ

t

RZL(SHDN)

t

RZH(SHDN)

SHDN

, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)

MAX

S2 closed; RL = 1kI, CL = 15pF; Figure 10

S1 closed; RL = 1kI, CL = 15pF; Figure 10

S1 closed; RL = 1kI, CL = 15pF; Figure 10

S2 closed; RL = 1kI, CL = 15pF; Figure 10

S1 closed; RL = 1kI, CL = 15pF; Figure 10
(Notes 6, 7)

S2 closed; RL = 1kI, CL = 15pF; Figure 10
(Notes 6, 7)

(Note 6) 50 800 ns

30 ns

30 ns

30 ns

30 ns

100

100

Fs

Fs

MAX14770E

_______________________________________________________________________________________ 5