Maxim MAX1490BEPG, MAX1490AEPG, MAX1490ACPG, MAX1480CEPI, MAX1480CCPI Datasheet

_________________General Description

The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B are complete, electrically isolated, RS-485/
RS-422 data-communications interface solutions in a
hybrid microcircuit. Transceivers, optocouplers, and a
transformer provide a complete interface in a standard
DIP package. A single +5V supply on the logic side pow­ers both sides of the interface.

The MAX1480B/MAX1480C/MAX1490B feature reduced­slew-rate drivers that minimize EMI and reduce reflec­tions caused by improperly terminated cables, allowing
error-free data transmission at data rates up to 250kbps.
The MAX1480A/MAX1490A driver slew rate is not limited,
allowing transmission rates up to 2.5Mbps. The
MAX1480A/B/C are designed for half-duplex communi­cation, while the MAX1490A/B feature full-duplex com­munication.

Drivers are short-circuit current limited and protected
against excessive power dissipation by thermal shut­down circuitry that places the driver outputs into a high­impedance state. The receiver input has a fail-safe
feature that guarantees a known output (RO low for the
MAX1480A/B/C, RO high for the MAX1490A/B/C) if the
input is open circuit.

The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B typically withstand 1600V

RMS

(1 minute) or

2000V

RMS

(1 second). Their isolated outputs meet all
RS-485/RS-422 specifications. The MAX1480A/B/C are
available in a 28-pin DIP package, and the MAX1490A/B
are available in a 24-pin DIP package.

________________________Applications

Isolated RS-485/RS-422 Data Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Automatic Test Equipment
HVAC/Building Control Networks

____________________________Features

♦ Isolated Data Interface, Typically to 1600V

RMS

(1 minute)

♦ Slew-Rate Limited for Errorless Data

Transmission (MAX1480B/MAX1480C/MAX1490B)

♦ High-Speed, Isolated, 2.5Mbps RS-485/RS-422

Interface (MAX1480A/MAX1490A)

♦ Full-Duplex Data Communication (MAX1490A/B)
♦ -7V to +12V Common-Mode Input Voltage Range

with Respect to Isolated Ground

♦ Single +5V Supply
♦ Current Limiting and Thermal Shutdown for

Driver Overload Protection

♦ Standard 0.6" DIP Package:

28-Pin DIP (MAX1480A/B/C)
24-Pin DIP (MAX1490A/B)

MAX1480A/B/C, MAX1490A/B

Complete, Isolated RS-485/RS-422

Data Interface

________________________________________________________________

Maxim Integrated Products

1

1

24
23
22
21
20
19
18
17

2
3
4
5

6

7

8

AC1
AC2
ISO V

CC1

ISO RO DRVD2

D1

A
B

Z

Y

SD

FS

GND1

16
15
14
13

9
10
11
12

ISO COM1
ISO DI DRV

ISO V

CC2

ISO RO LED

GND2

RO

DI

DIP

V

CC2

V

CC3

V

CC4

V

CC1

MAX1490A/B

MAX845

MAX488

MAX490

TOP VIEW

ISOLATION BARRIER

__________________Pin Configurations

19-0259; Rev 2a; 2/98

PART

†

MAX1480ACPI
MAX1480AEPI -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 Wide Plastic DIP
28 Wide Plastic DIP

_______________Ordering Information

Ordering Information continued at end of data sheet.

†

Data rate for “A” parts is up to 2.5Mbps. Data rate for “B” and

“C” parts is up to 250kbps.

PART

MAX1480A
MAX1480B

MAX1490A

HALF/

FULL

DUPLEX

Half
Half

Full

_____________________Selection Table

MAX1490B Full

DATA
RATE

(Mbps)

2.5

0.25

2.5

SLEW-

RATE

LIMITED

No

Yes

No

0.25 Yes

DRIVER

ENABLE

TIME

(µs)

0.2
35

—
—

Pin Configurations continued at end of data sheet.

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

MAX1480C 0.25Half Yes 0.5

MAX1480A/B/C, MAX1490A/B

Complete, Isolated RS-485/RS-422
Data Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC_

= 5V ±10%, VFS= V

CC_

, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

CC_

= 5V and TA= +25°C.)

(Notes 1, 2)

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.

With Respect to GND_

Supply Voltage (V

CC_

)...........................................-0.3V to +6V

Control Input Voltage (SD, FS)...............-0.3V to (V

CC_

+ 0.3V)

Receiver Output Voltage (RO

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

CC_

+ 0.3V)

Output Switch Voltage (D1, D2)........................................+12V

With Respect to ISO COM_

Control Input Voltage (ISO DE_ )....-0.3V to (ISO V

CC_

+ 0.3V)

Driver Input Voltage (ISO DI_ ).......-0.3V to (ISO V

CC_

+ 0.3V)

Receiver Output Voltage (ISO RO_)

...-0.3V to (ISO V

CC_

+ 0.3V)

Driver Output Voltage (A, B, Y, Z )......................-8V to +12.5V

Receiver Input Voltage (A, B)..............................-8V to +12.5V

LED Forward Current (DI, DE, ISO RO LED) ......................50mA

Continuous Power Dissipation (TA= +70°C)

24-Pin Plastic DIP (derate 8.7mW°C above +70°C) .....696mW

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

Operating Temperature Ranges

MAX1480_CPI/MAX1490_CPI..............................0°C to +70°C

MAX1480_EPI/MAX1490_EPI ...........................-40°C to +85°C

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

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

V

FS

= 0V

CONDITIONS

535f

SWL

UNITSMIN TYP MAXSYMBOLPARAMETER

FS = V

CC_

or open 725f

SWH

60 90

MAX1480B,
DE´ = V

CC_

or open

35 75

MAX1480A,
DE´ = V

CC_

or open

120

35 45

130

Low

V

0.8V

SDL

MAX1480C,
DE´ = V

CC_

or open

Shutdown Input Threshold

SD = V

CC_

High

µA0.2I

SHDN

Shutdown Supply Current
(Note 3)

2.4V

SDH

95

65 125

High
Low

2.4V

FSH

V

0.8V

FSL

FS Input Threshold

DE´, DI´
DE´, DI´

VV

CC_

- 0.4V

IH

Input High Voltage

V0.4V

IL

Input Low Voltage

FS low
FS high

µA50FS Input Pull-Up Current
pA10FS Input Leakage Current

pA10

Shutdown Input Leakage
Current

RL= ∞

RL= 54Ω
RL= ∞

RL= ∞
RL= 54Ω

RL= ∞

MAX1490B

RL= 54Ω

TA= +25°C, V

ISO

= 50VDC pF10C

ISO

Isolation Capacitance

TA= +25°C, V

ISO

= 50VDC MΩ100 10,000R

ISO

Isolation Resistance

kHzSwitch Frequency

mAI

CC

Operating Supply Current

RL= ∞
RL= 54Ω

100 150

MAX1490A

170

V8V

OD1

Differential Driver Output
(no load)

RL= 54Ω 95

MAX1480A/B/C, MAX1490A/B

Complete, Isolated RS-485/RS-422

Data Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

CC_

= 5V ±10%, VFS= V

CC_

, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

CC_

= 5V and TA= +25°C.)

(Notes 1, 2)

SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A

(V

CC_

= 5V ±10%, FS = V

CC_

, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

CC_

= 5V and TA= +25°C.)

R = 50Ω (RS-422) 2

R = 27Ω or 50Ω, Figure 4 V

0.3

∆V

OD

CONDITIONS

Change in Magnitude of
Driver Output Voltage for
Complementary Output States

R = 27Ω (RS-485), Figure 4

V

1.5 5

V

OD2

Differential Driver Output
(with load)

mA

1

R = 27Ω or 50Ω, Figure 4

-7V ≤ VCM≤ 12V
VCM= 0V

V-0.2 0.2V

TH

Receiver Differential Threshold

mV70∆V

TH

Receiver Input Hysteresis

V4V

OC

Driver Common-Mode Output

0.25

UNITSMIN TYP MAXSYMBOLPARAMETER

V

OUT

= 5.5V µA250I

OH

Receiver Output/Receiver
Output High Current

Using resistor values listed in Tables 1 and 2

-7V ≤ VO≤ 12V (Note 4) mA100ISO I

OSD

Driver Short-Circuit Current

V0.4V

OL

Receiver Output/Receiver
Output Low Voltage

Differential
Common Mode 0.3

MAX1490A/B
MAX1480A/B/C

Figures 5 and 7, R

DIFF

= 54Ω, CL1= CL2= 100pF

ns

100 275t

PHL

Driver Input to Output
Propagation Delay

ns25 90t

SKEW

CONDITIONS

Driver Output Skew

Figures 5 and 7, R

DIFF

= 54Ω,

CL1= CL2= 100pF

100 275t

PLH

Figures 6 and 8, CL= 100pF, S2 closed

Figures 5 and 10, R

DIFF

= 54Ω, CL1= CL2= 100pF

µs0.2 1.5t

ZH

Driver Enable to Output High
(MAX1480A only)

100 225t

PLH

Figures 5 and 7, R

DIFF

= 54Ω, CL1= CL2= 100pF

Figures 5 and 10, R

DIFF

= 54Ω, CL1= CL2= 100pF

ns

100 225t

PHL

Receiver Input to Output
Propagation Delay

ns20t

SKD

I

t

PLH

- t

PHL

I

Differential

Receiver Skew

ns15 40t

R, tF

Driver Rise or Fall Time

UNITSMIN TYP MAXSYMBOLPARAMETER

Figures 6 and 8, CL= 100pF, S1 closed µs0.2 1.5t

ZL

Driver Enable to Output Low
(MAX1480A only)

Figures 6 and 8, CL= 15pF, S2 closed µs0.2 1.5t

HZ

Driver Disable Time from High
(MAX1480A only)

Figures 6 and 8, CL= 15pF, S1 closed µs0.2 1.5t

LZ

Driver Disable Time from Low
(MAX1480A only)

-7V ≤ VCM≤ 12V kΩ12R

IN

Receiver Input Resistance

MAX1480A/B/C

MAX1490A/B

0.8

ISO I

IN

Input Current (A, B)

0.2

DE´ = 0V,
V

CC_

= 0V or 5.5V

VIN= 12V

VIN= -7V

MAX1480A/B/C, MAX1490A/B

Complete, Isolated RS-485/RS-422
Data Interface

4 _______________________________________________________________________________________

Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to logic-

side ground (GND_), unless otherwise specified.

Note 2: For DE

´ and DI´ pin descriptions, see

Detailed Block Diagram and Typical Application Circuit

(Figure 1 for MAX1480A/

MAX1480B/MAX1480C, Figure 2 for MAX1490A/MAX1490B).

Note 3: Shutdown supply current is the current at V

CC1

and V

CC2

when shutdown is enabled.

Note 4: Applies to peak current (see

Typical Operating Characteristics

). Although the MAX1480A/B/C and MAX1490A/B provide
electrical isolation between logic ground and signal paths, they do not provide isolation between external shields and the
signal paths (see

Isolated Common Connection

section).

SWITCHING CHARACTERISTICS—MAX1480B/MAX1480C/MAX1490B

(V

CC_

= 5V ±10%, FS = V

CC_

, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

CC_

= 5V and TA= +25°C.)

Figures 6 and 8, CL= 100pF, S1 closed µs35 100t

ZL

Driver Enable to Output Low
(MAX1480B only)

Figures 6 and 8, CL= 15pF, S2 closed µs13 50t

HZ

Driver Disable Time from High
(MAX1480B only)

Figures 6 and 8, CL= 15pF, S1 closed µs13 50

Figures 5 and 7, R

DIFF

= 54Ω, CL1= CL2= 100pF

Mbps

100t

SHDN

t

LZ

Driver Disable Time from Low
(MAX1480B only)

Maximum Data Rate

ns100 800t

SKEW

CONDITIONS

Driver Output Skew

Figures 6 and 9, CL= 100pF, S2 closed

t

PLH

, t

PHL

< 50% of data period

µs35 100t

ZH(SHDN)

Shutdown to Driver Output High

Figures 6 and 9, CL= 100pF, S1 closed

2.5f

MAX

µs

Figures 6 and 8, CL= 100pF, S2 closed

Figures 5 and 10, R

DIFF

= 54Ω, CL1= CL2= 100pF

µs35 100t

ZH

Driver Enable to Output High
(MAX1480B only)

35 100

0.8 2.0t

PLH

t

ZL(SHDN)

t

PLH

, t

PHL

< 50% of data period

Shutdown to Driver Output Low

Mbps0.25f

MAX

Figures 5 and 7, R

DIFF

= 54Ω, CL1= CL2= 100pF

Maximum Data Rate

Figures 5 and 10, R

DIFF

= 54Ω, CL1= CL2= 100pF

µs

0.8 2.0t

PHL

Receiver Input to Output
Propagation Delay

ns200t

SKD

I

t

PLH

- t

PHL

I

Differential

Receiver Skew

µs1.0 2.0t

R, tF

Driver Rise or Fall Time

UNITSMIN TYP MAXSYMBOLPARAMETER

µs100t

SHDN

Time to Shutdown

Figures 6 and 8, CL= 100pF, S2 closed µs0.5 4.5t

ZH

Driver Enable to Output High
(MAX1480C only)

Figures 6 and 8, CL= 100pF, S1 closed µs0.5 4.5t

ZL

Driver Enable to Output Low
(MAX1480C only)

Figures 6 and 8, CL= 15pF, S1 closed µs2.0 4.5t

LZ

Driver Disable Time from Low
(MAX1480C only)

Figures 6 and 8, CL= 15pF, S2 closed µs2.0 4.5t

HZ

Driver Disable Time from High
(MAX1480C only)

Figures 5 and 7, R

DIFF

= 54Ω, CL1= CL2= 100pF

µs

1.0 2.0t

PHL

Driver Input to Output
Propagation Delay

Figures 5 and 7, R

DIFF

= 54Ω, CL1= CL2= 100pF 1.0 2.0t

PLH

Time to Shutdown µs

Figures 6 and 9, CL= 100pF, S1 closed

µs

3 10t

ZL(SHDN)

Shutdown to Driver Output High Figures 6 and 9, CL= 100pF, S2 closed 3 10t

ZH(SHDN)

Shutdown to Driver Output Low µs

MAX1480A/B/C, MAX1490A/B

Complete, Isolated RS-485/RS-422

Data Interface

_______________________________________________________________________________________

5

0

OUTPUT CURRENT vs.

RECEIVER OUTPUT LOW VOLTAGE

MAX1480/90A/B-01

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

1.5

10

20

30

40

50

60

70

80

MEASURED AT ISO RO DRV

1.00.50 3.53.02.52.0 5.04.54.0

0

OUTPUT CURRENT vs.

RECEIVER OUTPUT HIGH VOLTAGE

MAX1480/90A/B-02

OUTPUT HIGH VOLTAGE (V)

OUTPUT CURRENT (mA)

1.5

-5

MEASURED AT ISO RO DRV

1.00.50 3.53.02.52.0 5.04.54.0

-10

-15

-20

-25

-30

3.00

-40 20

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

MAX1480/90A/B-03

TEMPERATURE (°C)

OUTPUT HIGH VOLTAGE (V)

0-20 6040 80

3.25

3.50

3.75

4.00

4.25

4.50

4.75

5.00
MEASURED AT ISO RO DRV

I

RO

= 8mA

0

-40 20

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

MAX1480/90A/B-04

TEMPERATURE (°C)

OUTPUT LOW VOLTAGE (V)

0-20 6040 80

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8
MEASURED AT ISO RO DRV

I

RO

= 8mA

0

DRIVER OUTPUT CURRENT

vs. DIFFERENTIAL OUTPUT VOLTAGE

MAX1480/90A/B-07

DIFFERENTIAL OUTPUT VOLTAGE (V)

OUTPUT CURRENT (mA)

1.5

10

20

30

40

50

60

70

80

DI´ = HIGH OR OPEN

1.00.50 3.53.02.52.0 5.04.54.0

OUTPUT CURRENT vs.

DRIVER OUTPUT LOW VOLTAGE

MAX1480/90A/B-05

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

0

160

180

140

100

120

80

40

60

0

20

1 2 3 4 5 6 7 8 9 10 11 12

0

-7

OUTPUT CURRENT vs.

DRIVER OUTPUT HIGH VOLTAGE

MAX1480/90A/B-06

OUTPUT HIGH VOLTAGE (V)

OUTPUT CURRENT (mA)

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-6 -5 -4 -3 -2 -1 1 2 3 4 5 6

2.0

-40 20

DRIVER DIFFERENTIAL OUTPUT VOLTAGE

vs. TEMPERATURE

MAX1480/90A/B-08

TEMPERATURE (°C)

DIFFERENTIAL OUTPUT VOLTAGE (V)

0-20 6040 80

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.0

DI´ = HIGH OR OPEN
R

L

= 54Ω

0

-40 20

MAX1480B/MAX1480C/MAX1490B

SHUTDOWN CURRENT vs. TEMPERATURE

MAX1480/90A/B-09

TEMPERATURE (°C)

SHUTDOWN CURRENT (µA)

0-20 6040 80

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40
SD = V

CC_

, DI´ = V

CC_

DE

´ (MAX1480B/C ONLY) = V

CC_

MEASURED AT V

CC1

AND V

CC2

__________________________________________Typical Operating Characteristics

(V

CC_

= 5V, FS = V

CC_

, TA = +25°C, unless otherwise noted.)

MAX1480A/B/C, MAX1490A/B

Complete, Isolated RS-485/RS-422
Data Interface

6 _______________________________________________________________________________________

_____________________________Typical Operating Characteristics (continued)

(V

CC_

= 5V, FS = V

CC_

, TA = +25°C, unless otherwise noted.)

0

60
40
20

80

100

120

140

160

MAX1480A

SUPPLY CURRENT vs. TEMPERATURE

MAX1480/90A/B-10

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

-40 -20 0 20 40 60 80

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 4.5V

R

L

= 54Ω

R

L

= ∞

V

CC

= 4.5V

DE´ = V

CC

20

60

40

80

100

120

140

MAX1480B

SUPPLY CURRENT vs. TEMPERATURE

MAX1480/90A/B-11

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

-40 -20 0 20 40 60 80

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 5.5V

V

CC

= 5.0V

R

L

= 54Ω

R

L

= ∞

DE´ = V

CC

V

CC

= 4.5V

V

CC

= 4.5V

20

70
60
50

30

40

80

90

100

110

120

MAX1480C

SUPPLY CURRENT vs. TEMPERATURE

MAX1480/90A/B-12

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

-40 -20 0 20 40 60 80

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 4.5V

R

L

= 54Ω

R

L

= ∞

V

CC

= 4.5V

DE´ = V

CC

80

120

100

140

160

180

200

MAX1490A

SUPPLY CURRENT vs. TEMPERATURE

MAX1480/90A/B-13

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

-40 -20 0 20 40 60 80

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 4.5V

R

L

= 54Ω

R

L

= ∞

V

CC

= 4.5V

50

100

90
80

60

70

110

120

130

140

150

MAX1490B

SUPPLY CURRENT vs. TEMPERATURE

MAX1480/90A/B-14

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

-40 -20 0 20 40 60 80

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 5.5V

V

CC

= 5.0V

V

CC

= 4.5V

R

L

= 54Ω

R

L

= ∞

V

CC

= 4.5V

0.1

10

1

100

DRIVER DISABLE TIME

vs. TEMPERATURE

MAX1480/90A/B-15a

TEMPERATURE (°C)

DRIVER DISABLE TIME (µs)

-40 -20 0 20 40 60 80

MAX1480A

MAX1480B

MAX1480C

RL = 54Ω
V

DI´

= 0V MEASURED FROM

DE´ TO VALID OUTPUT

0.1

10

1

100

DRIVER ENABLE TIME

vs. TEMPERATURE

MAX1480/90A/B-15b

TEMPERATURE (°C)

DRIVER ENABLE TIME (µs)

-40 -20 0 20 40 60 80

MAX1480A

MAX1480C

MAX1480B

RL = 54Ω
V

DI´

= 0V MEASURED FROM

DE´ TO VALID OUTPUT