Maxim MAX3462CPA Datasheet

General Description

The MAX3460–MAX3464 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 output level with a 54Ω load, 20Mbps 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

♦ Guaranteed 20Mbps Data Rate

♦ 20ns Transmitter and 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

MAX3460–MAX3464

+5V, Fail-Safe, 20Mbps, 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

MAX3460 Full Yes Yes Yes Yes Yes 14

MAX3461 Full Yes Yes No Yes Yes 14

MAX3462 Full No No No No No 8

MAX3463 Half Yes Yes Yes No No 8

MAX3464 Half Yes Yes No No No 8

Selector Guide

19-2217; Rev 1; 2/03

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

MAX3460CSD 0°C to +70°C 14 SO

MAX3460CPD 0°C to +70°C 14 Plastic DIP

MAX3460ESD -40°C to +85°C 14 SO

MAX3460EPD -40°C to +85°C 14 Plastic DIP

HOT SWAP

SHUTDOWN

MAX3460–MAX3464

+5V, Fail-Safe, 20Mbps, 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) V

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

Receiver Differential Threshold
Voltage

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CC

OD

OD

∆V

V

OC

∆V

HYS

I

IN

I

OSD

I

OSFD

A, B

I

A, B

V

TH

Figure 5, R = ∞ V

Figure 5, R = 27Ω 2.1 V

Figure 5, R = 50Ω or 27Ω

OD

(Note 2)

Figure 5, R = 50Ω or 27Ω 3V

Figure 5, R = 50Ω or 27Ω

OC

(Note 2)
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

DE = GND,
V

-7V ≤ VCM ≤ 12V -200 -125 -50 mV

≤ 12V, output low +250

OUT

≤ V

OUT

OUT

= GND or 5.25V

CC

, output high -250

CC

≤ 12V, output low +25

OUT

≤ 1V, output high -25

IN

V

= -7V -100

IN

VIN = +12V 250

V

= -7V -200

IN

4.75 5.25 V

CC

0.2 V

0.2 V

51530µA

8pF

V

µA

mA

mA

µA

MAX3460–MAX3464

+5V, Fail-Safe, 20Mbps, 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 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

SUPPLY CURRENT

N or m al O p er ati on ( stati c cond i ti on) I

Supply Current in SHDN I

SWITCHING CHARACTERISTICS

Driver Propagation Delay

Driver Differential Output Rise or
Fall Time

Driver Output Skew |t

Maximum Data Rate 20 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

Receiver Propagation Delay

Recei ver O utp ut S kew |t

Receiver Enable to Output Low t

Receiver Enable to Output High t

Receiver Disable Time from Low t

Receiver Disable Time from High t

PLH

PLH

- t

PHL

- t

P H L

VA + VB = 0 20 mV

TH

OH

OL

I

OZR

IN

I

OSR

Q

SHDN

t

PLH

t

PHL

t

R

t

F

|t

| t

SKEW

ZH

ZL

LZ

HZ

t

PLH

t

PHL

SKEW

ZL

ZH

LZ

HZ

IO = -4mA, VA - VB = V

IO = 4mA, VB - VA = V

0 ≤ VO ≤ V

CC

TH

TH

-7V ≤ VCM ≤ 12V 48 kΩ

0 ≤ VRO ≤ V

CC

No load, DI = VCC or DI = GND 2.5 4 mA
DE = GND and RE = VCC, or SHDN = V

Figures 6 and 7, R

= 50pF

C

L

Figures 6 and 7, R

= 50pF

C

L

Figures 6 and 7, R
C

= 50pF, TXP = GND or floating

L

DIFF

DIFF

DIFF

= 54Ω,

= 54Ω,

= 54Ω,

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

= 50pF

L

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

= 50pF

L

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

= 50pF

C

L

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

= 50pF

L

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

Figure 10, CL = 15pF, RXP = GND or
floating (Note 4)

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

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

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

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

VCC - 1.5 V

±7 ±95 mA

CC

110µA

0.4 V

±1µA

20 ns

20 ns

2ns

100 ns

100 ns

100 ns

100 ns

2ns

100 ns

100 ns

100 ns

100 ns

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.

MAX3460–MAX3464

+5V, Fail-Safe, 20Mbps, 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

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

MAX3460-64 toc01

2.00

2.05

2.15

2.10

2.30

2.35

2.25

2.20

2.40

NO LOAD SUPPLY CURRENT (mA)

-40 0 20-20

40

60 80

TEMPERATURE (°C)

DE = V

CC

DE = GND

0

30

20

10

40

50

60

0 2.01.50.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0

OUTPUT CURRENT

vs. RECEIVER OUTPUT LOW VOLTAGE

MAX3460-64 toc02

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

0

10

5

20

15

30

25

35

021345

OUTPUT CURRENT

vs. RECEIVER OUTPUT HIGH VOLTAGE

MAX3460-64 toc03

OUTPUT HIGH VOLTAGE (V)

OUTPUT CURRENT (mA)

Typical Operating Characteristics

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

t

ZH (SHDN

t

ZL (SHDN

t

ZH (SHDN

t

ZL (SHDN

800

MAX3460–MAX3464

+5V, Fail-Safe, 20Mbps, Profibus RS-485/

RS-422 Transceivers

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

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

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

50

40

30

20

10

SHUTDOWN SUPPLY CURRENT (nA)

0

-40 10-15 35 60 85
TEMPERATURE (°C)

MAX3460-64 toc04

RECEIVER OUTPUT LOW VOLTAGE (mV)

RECEIVER PROPAGATION DELAY

vs. TEMPERATURE

11

10

MAX3460-64 toc07

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

IO = 4mA

140

120

100

80

-40 10-15 35 60 85
TEMPERATURE (°C)

DRIVER PROPAGATION DELAY

vs. TEMPERATURE

12

R

= 54Ω

DIFF

= 50pF

C

L

10

MAX3460-64 toc05

MAX3460-64 toc08

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

4.90

IO = -4mA

4.85

4.80

4.75

4.70

OUTPUT HIGH VOLTAGE (V)

4.65

4.60

-40 85

10-15 35 60

TEMPERATURE (°C)

DRIVER DIFFERENTIAL OUTPUT VOLTAGE

vs. TEMPERATURE

4.0

R

= 54Ω

DIFF

3.5

MAX3460-64 toc06

MAX3460-64 toc09

9

PROPAGATION DELAY (ns)

8

7

-40 10-15 35 60 85
TEMPERATURE (°C)

DRIVER OUTPUT CURRENT

vs. DIFFERENTIAL OUTPUT VOLTAGE

100

10

1

OUTPUT CURRENT (mA)

0.1
021345

DIFFERENTIAL OUTPUT VOLTAGE (V)

8

PROPAGATION DELAY (ns)

6

4

200

160

MAX3460-64 toc10

120

80

OUTPUT CURRENT (mA)

40

0

3.0

OUTPUT VOLTAGE (V)

2.5

2.0

-40 10-15 35 60 85
TEMPERATURE (°C)

-40 10-15 35 60 85

OUTPUT CURRENT

vs. DRIVER OUTPUT LOW VOLTAGE

-160

MAX3460-64 toc11

-120

-80

OUTPUT CURRENT (mA)

-40

063912

OUTPUT LOW VOLTAGE (V)

0

TEMPERATURE (°C)

OUTPUT CURRENT

vs. DRIVER OUTPUT HIGH VOLTAGE

MAX3460-64 toc12

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