Maxim MAX3491CSD, MAX3491CPD, MAX3491C-D, MAX3490ESA, MAX3490CSA Datasheet

19-0333; Rev 0; 12/94

3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers

_______________General Description

The MAX3483, MAX3485, MAX3486, MAX3488,
MAX3490, and MAX3491 are 3.3V, low-power trans­ceivers for RS-485 and RS-422 communication. Each
part contains one driver and one receiver. The
MAX3483 and MAX3488 feature slew-rate-limited dri­vers that minimize EMI and reduce reflections caused
by improperly terminated cables, allowing error-free
data transmission at data rates up to 250kbps. The par­tially slew-rate-limited MAX3486 transmits up to

2.5Mbps. The MAX3485, MAX3490, and MAX3491
transmit at up to 10Mbps.

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 both
inputs are open circuit.

The MAX3488, MAX3490, and MAX3491 feature full­duplex communication, while the MAX3483, MAX3485,
and MAX3486 are designed for half-duplex communi­cation.

________________________Applications

Low-Power RS-485/RS-422 Transceivers
Telecommunications
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks

____________________________Features

♦ Operate from a Single 3.3V Supply—

No Charge Pump!

♦ Interoperable with +5V Logic
♦ 8ns Max Skew (MAX3485/MAX3490/MAX3491)
♦ Slew-Rate Limited for Errorless Data Transmission

(MAX3483/MAX3488)

♦ 2nA Low-Current Shutdown Mode

(MAX3483/MAX3485/MAX3486/MAX3491)

♦ -7V to +12V Common-Mode Input Voltage Range
♦ Allows up to 32 Transceivers on the Bus
♦ Full-Duplex and Half-Duplex Versions Available
♦ Industry Standard 75176 Pinout

(MAX3483/MAX3485/MAX3486)

♦ Current-Limiting and Thermal Shutdown for

Driver Overload Protection

______________Ordering Information

PART

MAX3483CPA

MAX3483CSA
MAX3483C/D 0°C to +70°C
MAX3483EPA
MAX3483ESA -40°C to +85°C
MAX3485CPA
MAX3485CSA
MAX3485C/D 0°C to +70°C
MAX3485EPA
MAX3485ESA -40°C to +85°C

Ordering Information continued at end of data sheet.

* Contact factory for for dice specifications.

TEMP. RANGE PIN-PACKAGE

0°C to +70°C
0°C to +70°C

-40°C to +85°C 8 Plastic DIP

0°C to +70°C 8 Plastic DIP
0°C to +70°C

-40°C to +85°C 8 Plastic DIP

8 Plastic DIP
8 SO
Dice*

8 SO

8 SO
Dice*

8 SO

MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491

______________________________________________________________Selection Table

PART

NUMBER

MAX3483
MAX3485
MAX3486
MAX3488
MAX3490
MAX3491

GUARANTEED

DATA RATE

(Mbps)

0.25 Half Yes Yes 2 8
10 Half No Yes 2 8

2.5 Half Yes Yes 2 8

0.25 Full Yes No — 8
10 Full No No — 8
10

________________________________________________________________

SUPPLY

VOLTAGE

(V)

3.0 to 3.6

HALF/FULL

DUPLEX

Full No Yes 2 14

SLEW-RATE

LIMITED

DRIVER/

RECEIVER

ENABLE

SHUTDOWN

CURRENT

(nA)

Maxim Integrated Products

PIN

COUNT

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

1

3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers

ABSOLUTE MAXIMUM RATINGS

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

Control Input Voltage (RE

Driver Input Voltage (DI).............................................-0.3V to 7V

Driver Output Voltage (A, B, Y, Z)..........................-7.5V to 12.5V

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

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

Continuous Power Dissipation (T

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

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

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)...................................-0.3V to 7V

+ 0.3V)

= +70°C)

A

CC

DC ELECTRICAL CHARACTERISTICS

(VCC= 3.3V ±0.3V, TA= T

MIN

to T

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

MAX

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

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

Operating Temperature Ranges

MAX34_ _C_ _.......................................................0°C to +70°C

MAX34_ _E_ _....................................................-40°C to +85°C

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

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

UNITSMIN TYP MAXSYMBOLPARAMETER

V

V0.2∆V

V3V

V0.2∆V

V2.0V
V0.8V

µA±2I

mA

µA

1

-1

µA

V-0.2 0.2V

mV50∆V

VVCC- 0.4V

V0.4V
µA±1I
kΩ12R

Differential Driver Output

Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
(Note 1)

Driver Common-Mode Output
Voltage

Change in Magnitude of
Common-Mode Output Voltage
(Note 1)

Input High Voltage
Input Low Voltage
Logic Input Current

Input Current (A, B)

Output Leakage (Y, Z)

Output Leakage (Y, Z)
in Shutdown Mode

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

V

IN1

I

IN2

I

I

OZR

CONDITIONS

RL= 100Ω (RS-422), Figure 4
RL= 54Ω (RS-485), Figure 4

OD

RL= 60Ω (RS-485), VCC= 3.3V, Figure 5

RL= 54Ω or 100Ω, Figure 4

OD

RL= 54Ω or 100Ω, Figure 4

OC

RL= 54Ω or 100Ω, Figure 4

OC

DE, DI, RE

IH

DE, DI, RE

IL

DE, DI, RE
DE = 0V,

= 0V or 3.6V

V

CC

DE = 0V, RE = 0V,

O

VCC= 0V or 3.6V, MAX3491
DE = 0V, RE = VCC,

O

VCC= 0V or 3.6V, MAX3491

-7V ≤ VCM≤ 12V

TH

VCM= 0V

TH

I

OH
OL

IN

= -1.5mA, VID= 200mV, Figure 6

OUT

I

= 2.5mA, VID= 200mV, Figure 6

OUT

VCC= 3.6V, 0V ≤ V

-7V ≤ VCM≤ 12V

OUT

≤ V

VIN= 12V
VIN= -7V
V

OUT

V

OUT

V

OUT

V

OUT

CC

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

2.0

1.5

1.5

1.0

-0.8
20

-20

MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491

2 _______________________________________________________________________________________

3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.3V ±0.3V, TA= T

Supply Current

Supply Current in Shutdown Mode
Driver Short-Circuit Output

Current
Receiver Short-Circuit Output

Current

MIN

to T

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

MAX

CONDITIONS

DE = VCC,

I

CC

SHDN

I

OSD

OSR

No load,
DI = 0V or V

DE = 0V, RE = VCC, DI = VCCor 0V
V

OUT

V

OUT

0V ≤ VRO≤ V

CC

= -7V
= 12V

CC

RE = 0V or V
DE = 0V,

RE = 0V

CC

1.1 2.2

0.95 1.9

-250
250

DRIVER SWITCHING CHARACTERISTICS—MAX3485, MAX3490, and MAX3491

(VCC= 3.3V, TA= +25°C)

CONDITIONS

Driver Differential Output Delay
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level

t

- t

|

PLH

DRIVER OUTPUT ENABLE/DISABLE TIMES (MAX3485/MAX3491 only)

Driver Output Enable Time to Low Level
Driver Output Enable Time to High Level
Driver Output Disable Time from High Level
Driver Output Disable Time from Low Level RL= 110Ω, Figure 10
Driver Output Enable Time from Shutdown to Low Level
Driver Output Enable Time from Shutdown to High Level

Driver Propagation Delay Skew (Note 2)

PHL|

PLH
PHL
PDS

PZL
PZH
PHZ
PLZ
PSL
PSH

RL= 60Ω, Figure 7

DD

RL= 60Ω, Figure 7

TD

RL= 27Ω, Figure 8
RL= 27Ω, Figure 8
RL= 27Ω, Figure 8

RL= 110Ω, Figure 10
RL= 110Ω, Figure 9
RL= 110Ω, Figure 9

RL= 110Ω, Figure 10
RL= 110Ω, Figure 9

MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491

UNITSMIN TYP MAXSYMBOLPARAMETER

mA

µA0.002 1I

mA

mA±8 ±60I

UNITSMIN TYP MAXSYMBOLPARAMETER

ns12235t
ns3825t
ns72235t
ns72235t
ns8t

ns45 90t
ns45 90t
ns40 80t
ns40 80t
ns650 900t
ns650 900t

DRIVER SWITCHING CHARACTERISTICS—MAX3486

(VCC= 3.3V, TA= +25°C)

CONDITIONS

Driver Differential Output Delay
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level

t

- t

|

PLH

Driver Output Enable Time to Low Level
Driver Output Enable Time to High Level
Driver Output Disable Time from High Level
Driver Output Disable Time from Low Level RL= 110Ω, Figure 10
Driver Output Enable Time from Shutdown to Low Level
Driver Output Enable Time from Shutdown to High Level

Driver Propagation Delay Skew (Note 2)

PHL|

_______________________________________________________________________________________ 3

PLH
PHL
PDS
PZL
PZH
PHZ
PLZ
PSL
PSH

RL= 60Ω, Figure 7

DD

RL= 60Ω, Figure 7

TD

RL= 27Ω, Figure 8
RL= 27Ω, Figure 8
RL= 27Ω, Figure 8
RL= 110Ω, Figure 10
RL= 110Ω, Figure 9
RL= 110Ω, Figure 9

RL= 110Ω, Figure 10
RL= 110Ω, Figure 9

UNITSMIN TYP MAXSYMBOLPARAMETER

ns24 48 70t
ns15 35 60t
ns20 48 70t
ns20 48 70t
ns11t
ns55 100t
ns55 100t
ns45 80t
ns45 80t
ns700 1000t
ns700 1000t

3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers

DRIVER SWITCHING CHARACTERISTICS—MAX3483 and MAX3488

(VCC= 3.3V, TA= +25°C)

CONDITIONS

Driver Differential Output Delay
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level

t

- t

|

PLH

DRIVER OUTPUT ENABLE/DISABLE TIMES (MAX3483 only)

Driver Output Enable Time to Low Level
Driver Output Enable Time to High Level
Driver Output Disable Time from High Level
Driver Output Disable Time from Low Level RL= 110Ω, Figure 10
Driver Output Enable Time from Shutdown to Low Level
Driver Output Enable Time from Shutdown to High Level

Driver Propagation Delay Skew (Note 2)

PHL|

PLH
PHL
PDS

PZL
PZH
PHZ
PLZ
PSL
PSH

RL= 60Ω, Figure 7

DD

RL= 60Ω, Figure 7

TD

RL= 27Ω, Figure 8
RL= 27Ω, Figure 8
RL= 27Ω, Figure 8

RL= 110Ω, Figure 10
RL= 110Ω, Figure 9
RL= 110Ω, Figure 9

RL= 110Ω, Figure 10
RL= 110Ω, Figure 9

RECEIVER SWITCHING CHARACTERISTICS

(VCC= 3.3V, TA= +25°C)

UNITSMIN TYP MAXSYMBOLPARAMETER

ns600 900 1400t
ns400 700 1200t
ns700 1000 1500t
ns700 1000 1500t
ns100t

ns900 1300t
ns600 800t
ns50 80t
ns50 80t
µs1.9 2.7t
µs2.2 3.0t

CONDITIONS

Time to Shutdown

Receiver Propagation Delay,
Low-to-High Level

Receiver Propagation Delay,
High-to-Low Level

t

- t

|

PLH

Propagation Delay Skew
Receiver Output Enable Time

to Low Level
Receiver Output Enable Time

to High Level
Receiver Output Disable

Time from High Level
Receiver Output Disable

Time from Low Level
Receiver Output Enable Time

from Shutdown to Low Level
Receiver Output Enable Time

from Shutdown to High Level

Note 1: ∆VODand ∆VOCare the changes in VODand VOC, respectively, when the DI input changes state.
Note 2: Measured on
Note 3: The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, the

MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491

Receiver

PHL|

t

PLH

|

parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to
have entered shutdown. See

(Y) - t

SHDN

t

RPLH

t

RPHL

t

RPDS

PRZL

PRZH

PRHZ

PRLZ

PRSL

PRSH

PHL

MAX3483/MAX3485/MAX3486/MAX3491 only
(Note 3)

VID= 0V to 3.0V, CL= 15pF, Figure 11
MAX3483/MAX3488
VID= 0V to 3.0V, CL= 15pF, Figure 11
MAX3483/MAX3488
VID= 0V to 3.0V, CL= 15pF, Figure 11
MAX3483/MAX3488

CL= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only

CL= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only

CL= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only

CL= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only

CL= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only

CL= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only

(Y)|and |t

Low-Power Shutdown Mode

PLH

(Z) - t

PHL

(Z)

|.

section.

25 65 90
25 75 120
25 65 90
25 75 120

10
20

UNITSMIN TYP MAXSYMBOLPARAMETER

ns80 190 300t

ns

ns

ns

ns25 50t

ns25 50t

ns25 45t

ns25 45t

ns720 1400t

ns720 1400t

4 _______________________________________________________________________________________

3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers

__________________________________________Typical Operating Characteristics

(VCC= 3.3V, TA= +25°C, unless otherwise noted.)

OUTPUT CURRENT vs.

RECEIVER OUTPUT LOW VOLTAGE

25

20

15

10

OUTPUT CURRENT (mA)

5

0

0 0.5 1.0 1.5 2.0 2.5 3.53.0

OUTPUT LOW VOLTAGE (V)

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

0.8

0.7

0.6

0.5

0.4

0.3

0.2

OUTPUT LOW VOLTAGE (V)

0.1
0

-40 -20 0 20 40 60 10080
TEMPERATURE (°C)

IRO = 2.5mA

-20

-18

MAX3483-01

-16

-14

-12

-10

-8

-6

OUTPUT CURRENT (mA)

-4

-2
0

0 0.5 1.0 1.5 2.0 2.5 3.53.0

100

90

MAX3483-04

80
70
60
50
40
30

OUTPUT CURRENT (mA)

20
10

0

0 0.5 1.0 1.5 2.0 2.5 3.53.0

OUTPUT CURRENT vs.

RECEIVER OUTPUT HIGH VOLTAGE

MAX3483-02

OUTPUT HIGH VOLTAGE (V)

OUTPUT HIGH VOLTAGE (V)

DRIVER OUTPUT CURRENT vs.

DIFFERENTIAL OUTPUT VOLTAGE

MAX3483-05

DIFFERENTIAL OUTPUT VOLTAGE (V)

DIFFERENTIAL OUTPUT VOLTAGE (V)

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

3.30

3.25

3.20

3.15

3.10

3.05

3.00

-40 -20 0 20 40 60 10080
TEMPERATURE (°C)

DRIVER DIFFERENTIAL OUTPUT

VOLTAGE vs.TEMPERATURE

2.6

2.5

2.4

2.3

2.2

2.1

2.0

1.9

1.8

1.7

1.6

-40 -20 0 20 40 60 10080
TEMPERATURE (°C)

IRO = 1.5mA

R = 54Ω

MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491

MAX3483-03

MAX3483-06

OUTPUT CURRENT vs.

DRIVER OUTPUT LOW VOLTAGE

175

150

125

100

75

50

OUTPUT CURRENT (mA)

25

0

0246 81012

OUTPUT LOW VOLTAGE (V)

_______________________________________________________________________________________

MAX3483-07

OUTPUT CURRENT vs.

DRIVER OUTPUT HIGH VOLTAGE

-100

-80

-60

-40

OUTPUT CURRENT (mA)

-20

0

-7 -6 -3-4-5 -2 -1
OUTPUT HIGH VOLTAGE (V)

MAX3483-08

543210

5