Rainbow Electronics MAX3469 User Manual

General Description

The MAX3465–MAX3469 are high-speed differential
bus transceivers for RS-485 and RS-422 communica­tions. They are designed to meet TIA/EIA-422-B,
TIA/EIA-485-A, V.11, and X.27 standards. The trans­ceiver complies with the Profibus specification provid­ing +2.1V minimum output level with a 54Ω load,
40Mbps data rate, and output skew less than 2ns. Each
part contains one three-state differential line driver and
one differential input line receiver. The devices operate
from a +5V supply and feature true fail-safe circuitry,
which guarantees a logic-high receiver output when the
receiver inputs are open or shorted. This enables all
receiver outputs on a terminated bus to output logic
highs when all transmitters are disabled.

All devices feature a 1/4-standard-unit load receiver
input impedance that allows 128 transceivers on the
bus. Driver and receiver propagation delays are guar­anteed under 20ns for multidrop, clock distribution
applications. Drivers are short-circuit current limited
and are protected against excessive power dissipation
by thermal-shutdown circuitry. The driver and receiver
feature active-high and active-low enables, respective­ly, that can be connected together externally to serve
as a direction control.

Applications

High-Speed RS-485 Communications

High-Speed RS-422 Communications

Level Translators

Industrial-Control Local Area Networks

Profibus Applications

Features

♦ Recommended for Profibus Applications

♦ Up to 40Mbps Data Rate

♦ 15ns Transmitter Propagation Delay

♦ 20ns Receiver Propagation Delay

♦ 2ns Transmitter and Receiver Skew

♦ High Differential Driver Output Level (2.1V on 54Ω)

♦ Hot-Swap Versions

♦ 1µA Shutdown Supply Current

♦ Low Supply Current Requirements (2.5mA, typ)

♦ Allow Up to 128 Transceivers on the Bus

♦ True Fail-Safe Receiver while Maintaining EIA/TIA-

485 Compatibility

♦ Designed for Multipoint Transmissions on Long

or Noisy Bus Lines

♦ Full-Duplex and Half-Duplex Versions Available

♦ Phase Controls to Correct for Twisted-Pair

Reversal for 14-Pin Versions

♦ Current-Limiting and Thermal Shutdown for

Driver Overload Protection

MAX3465–MAX3469

+5V, Fail-Safe, 40Mbps, Profibus RS-485/

RS-422 Transceivers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

PART

NUMBER

HALF/FULL

DUPLEX

RECEIVER/

DRIVER

ENABLE

LOW-

POWER

RECEIVER/

DRIVER PHASE

SELECT

INDEPENDENT

SHDN PIN

PIN COUNT

MAX3465 Full Yes Yes Yes Yes Yes 14

MAX3466 Full Yes Yes No Yes Yes 14

MAX3467 Full No No No No No 8

MAX3468 Half Yes Yes Yes No No 8

MAX3469 Half Yes Yes No No No 8

Selector Guide

19-3038; Rev 0; 10/03

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

Ordering Information continued at end of data sheet.

Pin Configurations appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX3465CSD 0°C to +70°C 14 SO

MAX3465CPD 0°C to +70°C 14 Plastic DIP

MAX3465ESD -40°C to +85°C 14 SO

MAX3465EPD -40°C to +85°C 14 Plastic DIP

HOT SWAP

SHUTDOWN

MAX3465–MAX3469

+5V, Fail-Safe, 40Mbps, Profibus RS-485/
RS-422 Transceivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

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.

Supply Voltage (VCC) to GND ..................................-0.3V to +6V

Control Input Voltage (RE, DE, DI, SHDN, TXP, RXP)

to GND....................................................-0.3V to (V

CC

+ 0.3V)

Driver Output Voltage (Y, Z) to GND .........................-8V to +13V

Receiver Input Voltage (A, B) to GND.......................-8V to +13V

Differential Driver Output Voltage (Y - Z) ...............................±8V

Differential Receiver Input (A - B) ..........................................±8V

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

CC

+ 0.3V)

Output Driver Current (Y, Z) ...........................................±250mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 5.88mW/°C above +70°C)................471mW

8-Pin DIP (derate 9.09mW/°C above +70°C)...............727mW

14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW

14-Pin DIP (derate 10mW/°C above +70°C)................800mW

Operating Temperature Range

MAX346_C__ ......................................................0°C to +70°C

MAX346_E__....................................................-40°C to +85°C

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

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

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

Power-Supply Range V

DRIVER

Differential Driver Output
(No Load)

Differential Driver Output V

Change in Magnitude of
Differential Output Voltage

Driver Common-Mode Output
Voltage

Change in Magnitude of
Common-Mode Voltage

Input High Voltage V

Input Low Voltage V

Input Hysteresis V

Output Leakage (Y and Z) Full
Duplex

Input Current I

Pulldown Current RXP = TXP = V

Driver Short-Circuit Output
Current (Note 3)

Driver Short-Circuit Foldback
Output Current (Note 3)

Thermal-Shutdown Threshold 140 °C

RECEIVER

Differential Input Capacitance C

Input Current (A and B) Full
Duplex

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CC

V

OD

OD

∆V

V

OC

∆V

HYS

I

IN

I

OSD

I

OSFD

A, B

I

A, B

Figure 5, R = ∞ V

Figure 5, R = 27Ω 2.1 V

Figure 5, R = 50Ω or 27Ω (Note 2) 0.2 V

OD

Figure 5, R = 50Ω or 27Ω 3V

Figure 5, R = 50Ω or 27Ω (Note 2) 0.2 V

OC

DE, DI, RE, SHDN 2.0 V

IH

DE, DI, RE, SHDN 0.8 V

IL

DE, DI, RE, SHDN 50 mV

V

= +12V +125

DE = GND, VCC =

O

GND or +5.25V
DI, RE, DE, SHDN ±1µA

CC

0 ≤ V

-7V ≤ V

(VCC - 1V) ≤ V

-7V ≤ V

Between A and B 8 pF

DE = GND,
V

≤ +12V, output low +250

OUT

≤ VCC, output high -250

OUT

≤ +12V, output low +25

OUT

≤ +1V, output high +25

OUT

= GND or +5.25V

CC

IN

= -7V -100

V

IN

VIN = +12V +250

V

= -7V -200

IN

4.75 5.25 V

CC

51530µA

V

µA

mA

mA

µA

MAX3465–MAX3469

+5V, Fail-Safe, 40Mbps, Profibus RS-485/

RS-422 Transceivers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Receiver Differential Threshold
Voltage

Receiver Input Hysteresis ∆V

Receiver Output High Voltage V

Receiver Output Low Voltage V

Three-State Output Current at
Receiver

Receiver Input Resistance R

Receiver Output Short-Circuit
Current

ESD Protection

SUPPLY CURRENT

N or m al O p er ati on
( S tati c C ond i ti on)

Supply Current in SHDN I

SWITCHING CHARACTERISTICS

Driver Propagation Delay

Driver Differential Output Rise or
Fall Time

Driver Output Skew |t

Driver Output Transition Skew Guaranteed by design 1 ns

Maximum Data Rate 30 40 Mbps

Driver Enable to Output High t

Driver Enable to Output Low t

Driver Disable Time from Low t

Driver Disable Time from High t

Driver Enable Skew Time |t

Driver Disable Skew Time |t

Receiver Propagation Delay

PLH

- t

|t

PHL

V

TH

OH

OL

I

OZR

I

OSR

I

SHDN

t

PLH

t

PHL

t

t

SKEW

ZH

ZL

LZ

HZ

ZL - tZH

ZL - tZH

t

PLH

t

PHL

-7V ≤ VCM ≤ +12V -200 -125 -50 mV

VCM = 0 20 mV

TH

IO = -4mA, VA - VB = V

IO = 4mA, VB - VA = V

0 ≤ VO ≤ V

-7V ≤ VCM ≤ +12V 48 kΩ

IN

0 ≤ VRO ≤ V

CC

CC

TH

TH

A, B, Y, and Z pins
(MAX3467/MAX3468/MAX3469)

No load, DI = VCC or DI = GND 2.5 4 mA

Q

DE = GND and RE = VCC, or SHDN = V

Figures 6 and 7, R
C

R

Figures 6 and 7, R
C

F

Figures 6 and 7, R
C

= 50pF

L

= 50pF

L

= 50pF, TXP = GND or floating

L

DIFF

DIFF

DIFF

= 54Ω,

= 54Ω,

= 54Ω,

VCC - 1.5 V

±7 ±95 mA

±6 kV

CC

110µA

Figures 8 and 9, S2 closed, RL = 500Ω,

= 50pF

C

L

Figures 8 and 9, S1 closed, RL = 500Ω,
C

= 50pF

L

Figures 8 and 9, S1 closed, RL = 500Ω,
C

= 50pF

L

Figures 8 and 9, S2 closed, RL = 500Ω,
C

= 50pF

L

= 500Ω, CL = 50pF, S1 closed (Figures

R

L

|

8 and 9), output low

R

= 500Ω, CL = 50pF, S2 closed (Figures

L

|

8 and 9), output high

Figure 10, CL = 15pF (Note 4) 20 ns

0.4 V

±1µA

15 ns

10 ns

2ns

30 ns

30 ns

30 ns

30 ns

5ns

5ns

Note 1: 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 2: ∆V

OD

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

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

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

Note 4: Capacitive load includes test probe and fixture capacitance.
Note 5: Shutdown is enabled by bringing RE high and DE low or by bringing SHDN high. If the enable inputs are in this state for less

than 50ns, the device 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.

MAX3465–MAX3469

+5V, Fail-Safe, 40Mbps, Profibus RS-485/
RS-422 Transceivers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Recei ve r O utp ut S kew

|t

PLH

-

t

PHL

|

Figure 10, C

L

= 15pF, RXP = GND or

floating (Note 4)

2ns

Receiver Enable to Output Low t

ZL

Figures 8 and 11, RL = 1kΩ, CL = 15pF,
S1 closed (Note 4)

30 ns

Receiver Enable to Output High t

ZH

Figures 8 and 11, RL = 1kΩ, CL = 15pF,
S2 closed (Note 4)

30 ns

Receiver Disable Time from Low t

LZ

Figures 8 and 11, RL = 1kΩ, CL = 15pF,
S1 closed (Note 4)

30 ns

Receiver Disable Time from High t

HZ

Figures 8 and 11, RL = 1kΩ, CL = 15pF,
S2 closed (Note 4)

30 ns

Time to Shutdown t

SHDN

(Note 5) 50

ns

Driver Enable from Shutdown to
Output High

)

Figures 8 and 9, RL = 500Ω, CL = 50pF,
S2 closed (Note 5)

4µs

Driver Enable from Shutdown to
Output Low

)

Figures 8 and 9, RL = 500Ω, CL = 50pF,
S1 closed (Note 5)

4µs

Receiver Enable from Shutdown to
Output High

)

Figures 8 and 11, RL = 1kΩ, CL = 15pF,
S2 closed (Notes 4, 5)

4µs

Receiver Enable from Shutdown to
Output Low

)

Figures 8 and 11, RL = 1kΩ, CL = 15pF,
S1 closed (Notes 4, 5)

4µs

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

MAX3465 toc01

TEMPERATURE (°C)

NO-LOAD SUPPLY CURRENT (mA)

6040-20 0 20

2.15

2.20

2.25

2.30

2.35

2.40

2.45

2.50

2.10

-40 80

DE = V

CC

DE = GND

OUTPUT CURRENT

vs. RECEIVER OUTPUT LOW VOLTAGE

MAX3465 toc02

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

4.54.03.53.02.52.01.51.00.5

10

20

30

40

50

60

0

0 5.0

OUTPUT CURRENT

vs. RECEIVER OUTPUT HIGH VOLTAGE

MAX3465 toc03

OUTPUT HIGH VOLTAGE (V)

OUTPUT CURRENT (mA)

4321

5

10

15

20

25

30

35

0

05

Typical Operating Characteristics

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

t

ZH (SHDN

800

t

ZL (SHDN

t

ZH (SHDN

t

ZL (SHDN

MAX3465–MAX3469

+5V, Fail-Safe, 40Mbps, Profibus RS-485/

RS-422 Transceivers

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

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

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

300

250

200

150

100

SHUTDOWN SUPPLY CURRENT (nA)

50

0

-40 85
TEMPERATURE (°C)

603510-15

MAX3465 toc04

RECEIVER OUTPUT LOW VOLTAGE (mV)

RECEIVER PROPAGATION DELAY

vs. TEMPERATURE

20

18

16

14

PROPAGATION DELAY (ns)

12

MAX3465 toc07

PROPAGATION DELAY (ns)

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

200

IO = -4mA

175

150

125

100

75

50

-40 85
TEMPERATURE (°C)

603510-15

DRIVER PROPAGATION DELAY

vs. TEMPERATURE

12

R

= 54Ω

DIFF

10

8

6

MAX3465 toc05

MAX3465 toc08

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

4.90

IO = 4mA

4.85

4.80

4.75

4.70

4.65

RECEIVER OUTPUT HIGH VOLTAGE (mV)

4.60

-40 85
TEMPERATURE (°C)

DRIVER DIFFERENTIAL OUTPUT VOLTAGE

vs. TEMPERATURE

3.5

R

= 54Ω

DIFF

3.0

2.5

OUTPUT VOLTAGE (V)

603510-15

MAX3465 toc06

MAX3465 toc09

10

-40 85
TEMPERATURE (°C)

603510-15

4

-40 85

DRIVER OUTPUT CURRENT

vs. DIFFERENTIAL OUTPUT VOLTAGE

100

MAX3465 toc10

10

1

OUTPUT CURRENT (mA)

0.1
05

DIFFERENTIAL OUTPUT VOLTAGE (V)

4321

vs. DRIVER OUTPUT LOW VOLTAGE

200

160

120

80

OUTPUT CURRENT (mA)

40

0

012

TEMPERATURE (°C)

OUTPUT CURRENT

OUTPUT LOW VOLTAGE (V)

603510-15

2.0

-40 85
TEMPERATURE (°C)

603510-15

OUTPUT CURRENT

vs. DRIVER OUTPUT HIGH VOLTAGE

-160

MAX3465 toc11

-120

-80

OUTPUT CURRENT (mA)

-40

0

963

-7 -1-5 -3 1 3 5
OUTPUT HIGH VOLTAGE (V)

MAX3465 toc12