MAXIM MAX3158 Technical data

General Description

The MAX3158 is a high CMRR RS-485/RS-422 data-com­munications interface providing ±60V isolation in a
hybrid microcircuit. A single +5V supply on the logic side
powers both sides of the interface, with external 100V
capacitors transferring power from the logic side to the
isolated side. Each MAX3158 contains one transmitter
and one receiver and is guaranteed to operate at data
rates up to 250kbps. Drivers are short-circuit current lim­ited and protected against excessive power dissipation
by thermal shutdown circuitry that places the driver out­puts into a high-impedance state. The receiver input has
a fail-safe feature that guarantees a logic-high receiver
output if the inputs are open, shorted, or connected to a
terminated transmission line with all drivers disabled.

The MAX3158 typically draws 25mA of supply current
when unloaded or when fully loaded with the driver dis­abled. Supply current drops to 25µA when the device is
placed in shutdown mode. The device is pin selectable
between half- and full-duplex mode and also features
an independently programmable receiver and transmit­ter output phase through separate pins. The MAX3158
is a low-cost replacement for opto-isolated trans­ceivers. For fully isolated RS-485/RS-422 transceivers,
refer to the MAX1480 family data sheet.

________________________Applications

Industrial Controls Telecommunications

Level Translators Local Area Networks

Features

♦ ±60V Isolated Data Interface

♦ +5V Single Supply

♦ Low-Cost Replacement for Opto-Isolated

Transceivers

♦ True Fail-Safe Receiver While Maintaining

EIA/TIA-485 Compliance

♦ Pin-Selectable Full/Half-Duplex Operation

♦ Phase Controls to Correct for Twisted-Pair

Reversal

♦ 25µA Low-Power Shutdown Mode

♦ Thermal Shutdown for Driver Overload Protection

♦ 28-Pin SSOP Package

♦ Slew-Rate-Limited Reduced EMI

MAX3158

High CMRR RS-485 Transceiver

with ±60V Isolation

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

19-2778; Rev 0; 2/03

Ordering Information

Pin Configurations appear at end of data sheet.

PART TEMP RANGE

PIN-PACKAGE

MAX3158CAI 0°C to +70°C 28 SSOP
MAX3158CPI 0°C to +70°C 28 PDIP
MAX3158EAI -40°C to +85°C 28 SSOP
MAX3158EPI -40°C to +85°C 28 PDIP

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.

V

CC

0.1µF

MICRO

V

CC

H/F
TXP
RXP

DE

MAX3158

DI
RE
RO

GND

C1HI C2LO C2HIC1LO

C1

0.047µFC20.047µF

ISOVCC

A
B
Y

Z
YR
ZR
AR
BR

ISOCOM

C3
1µF

RS-485

NODE

REMOTE GND

10nF

RT = 100Ω

RG

±60V

C4

GND OFFSET

REMOTE MICRO

MAX3158

High CMRR RS-485 Transceiver
with ±60V Isolation

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

(All voltages referenced to GND, unless otherwise noted.)

ELECTRICAL CHARACTERISTICS

(VCC= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at V

CC

= +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).............................................................+7V

Cable Ground (ISOCOM) ....................................................±75V

Isolated Supply ISOVCC Relative to Cable Ground

(ISOCOM) ...........................................................................+7V

Digital Input, Output Voltage

(DI, DE, RE, TXP, RXP, RO).....................-0.3V to (V

CC

+ 0.3V)

Digital Inputs (H/F) Relative to Cable Ground

(ISOCOM) .........................................-0.3V to (ISOVCC + 0.3V)

Driver Output Voltage (Y, Z) Relative to Cable Ground

(ISOCOM)............................................................-8V to +12.5V

Receiver Input Voltage (A, B) Relative to Cable Ground

(ISOCOM)............................................................-8V to +12.5V

Termination Connections (YR, ZR, AR, BR) Relative to Cable

Ground (ISOCOM)...............................................-8V to +12.5V

Charge-Pump Capacitance Low

(C1LO, C2LO) .........................................-0.3V to (V

CC

+ 0.3V)

Charge-Pump Capacitance High (C1HI, C2HI) Relative

to Cable Ground (ISOCOM) .............-0.3V to (ISOVCC + 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

28-Pin SSOP (derate 10.8mW/°C above +70°C) ..........860mW

28-Pin PDIP (derate 14.3mW/°C above +70°C)..........1143mW

Operating Temperature Ranges

MAX3158C_I .......................................................0°C to +70°C

MAX3158E_I ....................................................-40°C to +85°C

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

Storage Temperature Range ............................-65°C to +160°C

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

DRIVER

Differential Driver Output,
No Load

Differential Driver Output,
Loaded

Change in Magnitude of
Differential Output Voltage
(Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

V

∆V

OD1

OD2

Figure 1, R = 10MΩ 6V

Figure 1, R = 50Ω (RS-422) 2.0

Figure 1, R = 27Ω (RS-485) 1.5

Figure 1, R = 50Ω or R = 27Ω 0.2 V

OD

V

Driver Common-Mode Voltage V

Change in Magnitude of
Common-Mode Voltage
(Note 2)

Input High Voltage V

Input Low Voltage V

DI Input Hysteresis V

OC

∆V

HYS

Figure 1, R = 50Ω or R = 27Ω,

relative to ISOCOM

V

OC

Figure 1, R = 50Ω or R = 27Ω 0.2 V

OC

DE, DI, RE, TXP, RXP, relative to GND,

IH

H/F relative to ISOCOM

DE, DI, RE, TXP, RXP, relative to GND,

IL

H/F relative to ISOCOM

2.0 V

100 mV

3.5 V

0.8 V

MAX3158

High CMRR RS-485 Transceiver

with ±60V Isolation

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at V

CC

= +5V and TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Current

Input Current (A and B) I

Output Leakage (Y and Z)
Full Duplex

Driver Short-Circuit Output
Current (Note 3)

RECEIVER

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

SUPPLY CURRENT

Supply Current I

Supply Current in Shutdown
Mode

Maximum Ground Differential ∆V

I

I

IN1

IN2

DE, DI, RE ±2
H/F, TXP, RXP internal pulldown 10 40

DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN ­V

IN3

DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN ­V

DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN -

I

V

O

DE = GND, VCC = GND or 5.25V, -7V ≤ (VIN ­V

I

OSD1

I

OSD2

V

OH

I

OZR

V

V

-7V ≤ VCM - V

TH

TH

IO = -4mA, VID = -50mV V CC - 1.5 V

IO = 4mA, VID = -200mV 0.4

OL

0.4V ≤ VO ≤ 2.4V ±1µA

-7V ≤ VCM - V
ISOCOM

IN

-7V ≤ VCM - V
BR open

I

OSR

CC

I

SHDN

GND

0V ≤ VRO ≤ V

No load, RE = DE = DI = GND or V
DE = GND, RE = VCC, V
DE = GND, RE = VCC, V

DE = GND, RE = VCC,
| ISOCOM leakage | ≤ 650µA

) ≤ +12V, AR = BR = ISOCOM

ISOCOM

) ≤ +12V, AR open, BR open

ISOCOM

) ≤ +12V, YR = ZR = ISOCOM

ISOCOM

) ≤ +12V, YR open, ZR open

ISOCOM

ISOCOM

ISOCOM

- 7V ≤ V

- 7V ≤ V

CC

≤ V

OUT

≤ V

OUT

≤ +12V -200 -125 -50 m V

ISOCOM

≤ +12V, AR = BR =

ISOCOM

≤ +12V, AR open,

ISOCOM

ISOVCC

+ 12V 250

ISOCOM

CC

= GND 25 60

ISOCOM

ISOCOM

= ±60V ±650

-5.0 +8.0

-0.58 +1.0

-5.0 +8.0

-0.58 +1.0

-250

25 mV

1.5

12

±7 ±100 mA

25 85 mA

±60 V

µA

mA

mA

mA

V

kΩ

µA

MAX3158

High CMRR RS-485 Transceiver
with ±60V Isolation

4 _______________________________________________________________________________________

SWITCHING CHARACTERISTICS

(VCC= +5V ±5%, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = C4 = 1µF. Typical values are at VCC= +5V and TA= +25°C.)

Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referred 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: Current level applies to peak current just prior to foldback-current limiting.
Note 4: The device is put into shutdown by bringing RE high and DE low. 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 700ns, the device is guaran­teed to have entered shutdown.

Driver Input to Output

Driver Output Skew
| t

Driver Rise or Fall Time tDR, t

Maximum Data Rate f

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 Input to Output

Differential Receiver Skew
| 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

Time to Shutdown t

Driver Enable from Shutdown to
Output High

Driver Enable from Shutdown to
Output Low

Receiver Enable from Shutdown
to Output High

Receiver Enable from Shutdown
to Output Low

Charge-Pump Oscillating
Frequency

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DPLH

RPLH

- t

- t

DPHL

RPHL

t

DPLH

t

DPHL

t

|

|

DSKEW

MAX

DZH

DZL

DLZ

DHZ

t

RPLH

t

RPHL

t

RSKEW

RZL

RZH

RLZ

RHZ

SHDN

t

DZH

(SHDN)

t

DZL

(SHDN)

t

RZH

(SHDN)

t

RZL

(SHDN)

f

OSC

Figures 3 and 5, R
C

= CL2 = 100pF

L1

Figures 3 and 5, R
C

= CL2 = 100pF

L1

Figures 3 and 5, R
C

= CL2 = 100pF

L1

Figures 3 and 5, R

DF

C

= CL2 =100pF

L1

Figures 4 and 6, CL = 100pF, S2 closed 3500 ns

Figures 4 and 6, CL = 100pF, S1 closed 3500 ns

Figures 4 and 6, CL = 15pF, S1 closed 300 ns

Figures 4 and 6, CL = 15pF, S2 closed 300 ns

,

Figures 7 and 9; | VID | ≥ 2.0V 440 600 ns

Figures 7 and 9; | VID | ≥ 2.0V 20 ns

Figures 2 and 8, CL = 100pF, S1 closed 20 50 ns

Figures 2 and 8, CL = 100pF, S2 closed 20 50 ns

Figures 2 and 8, C

Figures 2 and 8, C

(Note 4) 50 200 700 ns

Figures 4 and 6, C

Figures 4 and 6, C

Figures 2 and 8, C

Figures 2 and 8, C

= 54Ω,

DIFF

DIFF

DIFF

DIFF

= 54Ω,

= 54Ω,

= 54Ω,

400 1400 2000

400 1400 2000

200 1200 2200 ns

250 kbps

= 100pF, S1 closed 200 500 ns

L

= 100pF, S2 closed 200 500 ns

L

= 15pF, S2 closed 0.2 1 ms

L

= 15pF, S1 closed 0.2 1 ms

L

= 100pF, S2 closed 0.2 1 m s

L

= 100pF, S1 closed 0.2 1 ms

L

1.3 MHz

250 ns

ns

MAX3158

High CMRR RS-485 Transceiver

with ±60V Isolation

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VCC= +5V, YR = ZR = AR = BR = ISOCOM, C1 = C2 = 0.047µF, C3 = 1µF, C4 = 10nF, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE

160

140

RL = 54Ω

120

100

80

60

SUPPY CURRENT (mA)

40

NO LOAD

20

0

-40 -20 -10 0 10 20 30-30 40 50 60 70 80 90
TEMPERATURE (°C)

MAX3158 toc01

-100

SUPPY CURRENT (µA)

-200

-300

RECEIVER OUTPUT CURRENT

vs. RECEIVER OUTPUT HIGH VOLTAGE

20

18

16

14

12

10

8

6

OUTPUT CURRENT (mA)

4

2

0

0 2.0 2.51.51.00.5 3.0 3.5 4.0 4.5 5.0 5.5

OUTPUT HIGH VOLTAGE (V)

MAX3158 toc04

OUTPUT LOW VOLTAGE (V)

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

300

V

= -50V

ISOCOM

200

100

0

V

= 0V

ISOCOM

V

= +50V

ISOCOM

-40 -20 -10 0 10 20 30-30 40 50 60 70 80 90
TEMPERATURE (°C)

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

0.50

IRO = 8mA

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)

MAX3158 toc02

OUTPUT CURRENT (mA)

4.40

4.35

MAX3158 toc05

4.30

4.25

4.20

4.15

4.10

OUTPUT VOLTAGE (V)

4.05

4.00

3.95

RECEIVER OUTPUT CURRENT

vs. RECEIVER OUTPUT LOW VOLTAGE

45

40

35

30

25

20

15

10

5

0

021 3456

OUTPUT LOW VOLTAGE (V)

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

IRO = -8mA

-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)

MAX3158 toc03

MAX3158 toc06

DRIVER OUTPUT CURRENT

vs. DRIVER OUTPUT LOW VOLTAGE

160

140

120

100

80

60

OUTPUT CURRENT (mA)

40

20

0

042 6 8 101214

OUTPUT VOLTAGE (V)

0

-10

-20

MAX3158 toc07

-30

-40

-50

-60

-70

-80

OUTPUT CURRENT (mA)

-90

-100

-110

-120

DRIVER OUTPUT CURRENT

vs. DRIVER OUTPUT HIGH VOLTAGE

MAX3158 toc08

-8 -4-6 -20246
OUTPUT HIGH VOLTAGE (V)

DRIVER OUTPUT CURRENT

vs. DIFFERENTIAL OUTPUT VOLTAGE

100

10

1

OUTPUT CURRENT (mA)

0.1

0.01
01 32546

DIFFERENTIAL OUTPUT VOLTAGE (V)

MAX3158 toc09