Maxim MAX1483ESA, MAX1483EPA, MAX1483CUA, MAX1483CSA, MAX1483CPA Datasheet

19-0367; Rev 0; 2/95

20µA, 1⁄8-Unit-Load, Slew-Rate-Limited

RS-485 Transceivers

_______________General Description

The MAX1482 and MAX1483 are low-power trans­ceivers for RS-485 and RS-422 communication. Both
feature slew-rate-limited drivers that minimize EMI and
reduce reflections caused by improperly terminated
cables. Data rates are guaranteed up to 250kbps.

The MAX1482/MAX1483 draw only 20µA of supply cur­rent. Additionally, they have a low-current shutdown
mode that consumes only 0.1µA. Both parts operate
from a single +5V supply.

Drivers are short-circuit current limited and are 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 output if the input
is open circuit.

The MAX1482 is full duplex and the MAX1483 is half
duplex. Both parts have a 1⁄8-unit-load input impedance
that guarantees up to 256 transceivers on the bus.

________________________Applications

Low-Power RS-485/RS-422 Networks
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Large 256-Node LANs

____________________________Features

♦ Low 20µA Operating Current
♦ Slew-Rate Limited for Reduced EMI and

Reduced Reflections

♦ 0.1µA Low-Current Shutdown Mode
♦ Designed for RS-485 and RS-422 Applications
♦ Operate from a Single +5V Supply
♦ -7V to +12V Common-Mode Input Voltage Range
♦ Allows up to 256 Transceivers on the Bus—

1

Guaranteed (

⁄8-unit load)

♦ Current Limiting and Thermal Shutdown for

Driver Overload Protection

______________Ordering Information

PART

MAX1482CPD

MAX1482CSD
MAX1482EPD -40°C to +85°C
MAX1482ESD -40°C to +85°C 14 SO
MAX1483CPA
MAX1483CSA 0°C to +70°C 8 SO
MAX1483CUA 0°C to +70°C 8 µMAX
MAX1483EPA -40°C to +85°C 8 Plastic DIP
MAX1483ESA -40°C to +85°C 8 SO

TEMP. RANGE PIN-PACKAGE

0°C to +70°C
0°C to +70°C

14 Plastic DIP
14 SO
14 Plastic DIP

0°C to +70°C 8 Plastic DIP

MAX1482/MAX1483

_________Typical Operating Circuits

_________________Pin Configurations

TOP VIEW

+5V

R

1

RO

2

RE

3

DE

4

D

DI

NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM 
DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH. 
TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.

8
7

6

5

MAX1483

V

CC

B

Rt

A

GND

Rt

DE

D

B

A

R

RE

DI

RO

RO

2

RE

3

DE

4

D

DI

DIP/SO

1

B

V

CC

2

MAX1483

RO

3
4

RE

R

1

µMAX

MAX1482 appears at end of data sheet.

________________________________________________________________

MAX1482 appears at end of data sheet.

Maxim Integrated Products

Call toll free 1-800-998-8800 for free samples or literature.

8

V

CC

7

B

6

A

5

GND

A

8
7

GND
DI

6

DE

5

1

20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (VCC)...............................................................7V

Control Input Voltages (RE

Driver Input Voltage (DI).............................-0.5V to (V

Driver Output Voltages ..........................................-7.5V to 12.5V

Receiver Input Voltages (A, B) ..............................-7.5V to 12.5V

Receiver Output Voltage (RO)....................-0.5V to (V

Continuous Power Dissipation (T

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

14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) .800mW

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.

, DE).................-0.5V to (VCC+ 0.5V)

= +70°C)

A

CC

CC

+ 0.5V)

+ 0.5V)

DC ELECTRICAL CHARACTERISTICS

(VCC= 5V ±5%, TA= T

Differential Driver Output (no load)

MAX1482/MAX1483

Differential Driver Output
(with load)

Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States

Driver Common-Mode Output
Voltage

Change in Magnitude of Driver
Common-Mode Output Voltage
for Complementary Output States

Three-State (high impedance)
Output Current at Driver

Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current

Input Current
(A, B)

Receiver Differential Threshold
Voltage

Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage

Three-State (high impedance)
Output Current at Receiver

Receiver Input Resistance

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

ground unless otherwise specified.

MIN

to T

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

MAX

OD1

V

R = 50Ω (RS-422), Figure 1

OD2

R = 27Ω (RS-485), Figure 1

R = 27Ω or 50Ω, Figure 1

OD

R = 27Ω or 50Ω, Figure 1

OC

R = 27Ω or 50Ω, Figure 1

OD

MAX1482 only,

OZD

-7V < V

Y andVZ

DE, DI, –R—E

IH

DE, DI, –R—E

IL

DE, DI, –R—E

IN1

MAX1482,
DE = 0V, VCC= 0V or 5.25V

I

IN2

MAX1483,
DE = 0V, VCC= 0V or 5.25V

V

-7V ≤ VCM≤ 12V

TH

VCM= 0V

TH

IO= -4mA, VID= 200mV

OH

IO = 4mA, VID= -200mV

OL

0.4V ≤ VO≤ 2.4V

OZR

R

IN

–
–
–

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

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

8-Pin µMAX (derate 4.10mW/°C above +70°C).............330mW

Operating Temperature Ranges

MAX148_C_ _ .......................................................0°C to +70°C

MAX148_E_ _.....................................................-40°C to +85°C

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

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

CONDITIONS

25

1.5 5

< 12V

VIN= 12V
VIN= -7V
VIN= 12V
VIN= -7V

3.5V

150

-100
200

-150

0.4V

UNITSMIN TYP MAXSYMBOLPARAMETER

V5V
V

V0.2∆V

V3V

V0.2∆V

µA±50I

V2.0V
V0.8V

µA±2I

µA

V-0.2 0.2

mV75∆V

V

V
µA±1I
kΩ96-7V ≤ VCM≤ 12V

2 _______________________________________________________________________________________

20µA, 1⁄8-Unit-Load, Slew-Rate-Limited

RS-485 Transceivers

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= 5V ±5%, TA= T

No-Load Supply Current

Supply Current in Shutdown
Driver Short-Circuit Current
Receiver Short-Circuit Current

MIN

to T

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

MAX

CONDITIONS

MAX1482,
RE = 0V or V

I

CC

MAX1483,
RE = 0V or V

DE = 0V, RE = V

SHDN

DI = high or low, -7V ≤ VO≤ 12V (Note 2)

OSD

0V ≤ VO≤ V

OSR

CC

CC

CC

DE = V
DE = 0V
DE = V
DE = 0V

CC

SWITCHING CHARACTERISTICS

(VCC= 5V ±5%, TA= T

PARAMETER SYMBOL MIN TYP MAX UNITS

Driver Input to Output
Driver Output Skew to Output

Driver Rise or Fall Time
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 t

|t

- t

PLH

Receiver Skew

|Differential

PHL

Receiver Enable to Output Low t
Receiver Enable to Output High t
Receiver Disable Time from Low t
Receiver Disable Time from High t
Maximum Data Rate f
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

MIN

to T

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

MAX

CONDITIONS

t

PLH

t

PHL

t

SKEW

tR, t

ZH
ZL
LZ
HZ

,

t

PLH

t

SKD

ZL
ZH
LZ
HZ

MAX

SHDN

t

ZH(SHDN)

t

ZL(SHDN)

t

ZH(SHDN)

t

ZL(SHDN)

Figures 3 and 5, R
CL1= CL2= 100pF

Figures 3 and 5, R
Figures 3 and 5, R

F

Figures 4 and 6, CL= 100pF, S2 closed
Figures 4 and 6, CL= 100pF, S1 closed
Figures 4 and 6, CL= 15pF, S1 closed
Figures 4 and 6, CL= 15pF, S2 closed
Figures 3 and 7, R

PHL

Figures 3 and 7, R
Figures 2 and 8, CRL= 15pF, S1 closed 90 ns

Figures 2 and 8, CRL= 15pF, S2 closed 90 ns
Figures 2 and 8, CRL= 15pF, S1 closed 90 ns
Figures 2 and 8, CRL= 15pF, S2 closed 90 ns

(Note 3) 50 200 600 ns
Figures 4 and 6, CL= 100pF, S2 closed 2 µs

Figures 4 and 6, CL= 100pF, S1 closed 2 µs
Figures 2 and 8, CL= 15pF, S2 closed,

A - B = 2V
Figures 2 and 8, CL= 15pF, S1 closed,

B - A = 2V

= 54Ω,

DIFF

= 54Ω, CL1= CL2= 100pF

DIFF

= 54Ω, CL1= CL2= 100pF

DIFF

= 54Ω, CL1= CL2= 100pF 0.25 2.25 µs

DIFF

= 54Ω, CL1= CL2= 100pF 160 ns

DIFF

CC

CC

UNITSMIN TYP MAXSYMBOLPARAMETER

25 45
20 35
55 85

µA

20 35

µA0.1 10I

mA35 250I
mA±7 ±95I

2

µs

2

800

ns

0.25 2 µs

0.2 2

0.1 2

µs
µs

0.3 3.0 µs

0.3 3.0 µs

250 kbps

3

µs

3

µs

MAX1482/MAX1483

Note 2: Applies to peak current. See

Typical Operating Characteristics.

Note 3: The MAX1482/MAX1483 are put into shutdown by bringing–R—E–high and DE low. If the inputs are in this state for less

than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are
guaranteed to have entered shutdown. See

Low-Power Shutdown Mode

section.

_______________________________________________________________________________________ 3

20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers

__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

RECEIVER PROPAGATION DELAY

1400

1300

1200

1100

1000

900

RECEIVER PROPAGATION DELAY (ns)

800

MAX1482/MAX1483

3.5

3.0

2.5

2.0

DIFFERENTIAL OUTPUT VOLTAGE (V)

1.5

vs. TEMPERATURE

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

DRIVER DIFFERENTIAL OUTPUT VOLTAGE

vs. TEMPERATURE

R = 54Ω

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

MAX1482

SUPPLY CURRENT

80
70

60
50
40
30

SUPPLY CURRENT (µA)

20
10

0

vs. TEMPERATURE

DE = V

-40 -20 20 80 100

040

TEMPERATURE (°C)

MAX1482-01

DRIVER PROPAGATION DELAY (ns)

MAX1482-04

OUTPUT CURRENT (mA)

CC

DE = 0V

DRIVER PROPAGATION DELAY

1200
1100

1000

900
800
700
600
500
400

140

120
100

80

60

40

20

0

60

vs. TEMPERATURE

-40 -20 20 80 100

040
TEMPERATURE (°C)

OUTPUT CURRENT vs.

DRIVER OUTPUT LOW VOLTAGE

0246 10812

OUTPUT LOW VOLTAGE (V)

MAX1482-07

60

80
70

60
50
40
30

SUPPLY CURRENT (µA)

20
10

0

-40 -20 20 80 100

90
80

MAX1482-02

70
60
50
40
30

OUTPUT CURRENT (mA)

20
10

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

120

MAX1482-05

100

80

60

40

OUTPUT CURRENT (mA)

20

0

-7 -6 -4 -2 0 2 4-5 -3 -1 315

MAX1483

SUPPLY CURRENT

vs. TEMPERATURE

DE = V



DE = GND

040

TEMPERATURE (°C)

DRIVER OUTPUT CURRENT vs.

DIFFERENTIAL OUTPUT VOLTAGE

OUTPUT VOLTAGE (V)

OUTPUT CURRENT vs.

DRIVER OUTPUT HIGH VOLTAGE

OUTPUT LOW VOLTAGE (V)

MAX1482-08

CC

60

MAX1482-03

MAX1482-06

4 _______________________________________________________________________________________