19-1474; Rev 0; 4/99
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
General Description
Devices in the MAX3483E family (MAX3483E/MAX3485E/
MAX3486E/MAX3488E/MAX3490E/MAX3491E) are
±15kV ESD-protected, +3.3V, low-power transceivers for
RS-485 and RS-422 communications. Each device con-
tains one driver and one receiver. The MAX3483E and
MAX3488E feature slew-rate-limited drivers that minimize
EMI and reduce reflections caused by improperly termi-
nated cables, allowing error-free data transmission at
data rates up to 250kbps. The partially slew-rate-limited
MAX3486E transmits up to 2.5Mbps. The MAX3485E,
MAX3490E, and MAX3491E transmit at up to 12Mbps.
All devices feature enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air-
Gap Discharge, ±8kV using IEC 1000-4-2 Contact
Discharge, and ±15kV using the Human Body Model.
Drivers are short-circuit current limited and are protect-
ed 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 MAX3488E, MAX3490E, and MAX3491E feature
full-duplex communication, while the MAX3483E,
MAX3485E, and MAX3486E are designed for half-
duplex communication.
Features
o
ESD Protection for RS-485 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
o
Operate from a Single +3.3V Supply—
No Charge Pump Required
o
Interoperable with +5V Logic
o
Guaranteed 12Mbps Data Rate
(MAX3485E/MAX3490E/MAX3491E)
o
Slew-Rate Limited for Errorless Data Transmission
(MAX3483E/MAX3488E)
o
2nA Low-Current Shutdown Mode
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
o
-7V to +12V Common-Mode Input Voltage Range
o
Full-Duplex and Half-Duplex Versions Available
o
Industry-Standard 75176 Pinout
(MAX3483E/MAX3485E/MAX3486E)
o
Current-Limiting and Thermal Shutdown for
Driver Overload Protection
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
Ordering Information
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
MAX3483ECSA
MAX3483ECPA
MAX3483EESA
MAX3483EEPA
MAX3485ECSA
MAX3485ECPA
MAX3485EESA
MAX3485EEPA
Applications
Telecommunications
Industrial-Control Local Area Networks
Transceivers for EMI-Sensitive Applications
Integrated Services Digital Networks
Packet Switching
Ordering Information continued at end of data sheet.
Selector Guide
PART
NUMBER
MAX3483E
MAX3485E
MAX3486E
MAX3488E
MAX3490E
MAX3491E
GUARANTEED SUPPLY
DATA RATE
VOLTAGE
(Mbps)
(V)
0.25
12
2.5
0.25
12
12
3.0 to 3.6
DRIVER/ SHUTDOWN
±15kV
HALF/FULL SLEW-RATE
RECEIVER CURRENT
ESD
DUPLEX
LIMITED
ENABLE
(nA)
PROTECTION
Half
Half
Half
Full
Full
Full
Yes
No
Yes
Yes
No
No
Yes
Yes
Yes
No
No
Yes
2
2
2
—
—
2
Yes
Yes
Yes
Yes
Yes
Yes
PIN
COUNT
8
8
8
8
8
14
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
).............................................................+7V
Control Input Voltage (RE,
DE).................................-0.3V to +7V
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
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW
14-Pin SO (derate 8.33mW/°C above +70°C)................667mW
14-Pin Plastic DIP (derate 10mW/°C above +70°C) ......800mW
Operating Temperature Ranges
MAX34_ _ EC_ _ ...................................................0°C to +70°C
MAX34_ _ EE_ _.................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V ±0.3V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
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
Supply Voltage Range
Supply Current
Supply Current in Shutdown Mode
2
SYMBOL
V
OD
CONDITIONS
R
L
= 100Ω (RS-422), Figure 4
R
L
= 54Ω (RS-485), Figure 4
R
L
= 60Ω (RS-485), V
CC
= 3.3V, Figure 5
R
L
= 54Ω or 100Ω, Figure 4
MIN
2.0
1.5
1.5
0.2
TYP
MAX
UNITS
V
∆V
OD
V
V
OC
∆V
OC
V
IH
V
IL
I
IN1
I
IN2
I
O
I
O
V
TH
∆V
TH
V
OH
V
OL
I
OZR
R
IN
V
CC
I
CC
I
SHDN
R
L
= 54Ω or 100Ω, Figure 4
R
L
= 54Ω or 100Ω, Figure 4
DE, DI,
RE
DE, DI,
RE
DE, DI,
RE
DE = 0,
V
CC
= 0 or 3.6V
V
IN
= 12V
V
IN
= -7V
V
OUT
= 12V
DE = 0,
RE
= 0,
V
CC
= 0 or 3.6V, MAX3491E V
OUT
= -7V
V
OUT
= 12V
DE = 0,
RE
= V
CC
,
V
CC
= 0 or 3.6V, MAX3491E V
OUT
= -7V
-7V
≤
V
CM
≤
12V
V
CM
= 0
I
OUT
= -1.5mA, V
ID
= 200mV, Figure 6
I
OUT
= 2.5mA, V
ID
= 200mV, Figure 6
V
CC
= 3.6V, 0
≤
V
OUT
≤
V
CC
-7V
≤
V
CM
≤
12V
No load,
DI = 0 or V
CC
DE = V
CC
,
RE
= 0 or V
CC
DE = 0,
RE
= 0
12
3.0
1.1
0.95
0.002
V
CC
- 0.4
-0.2
50
2.0
3
V
0.2
V
V
0.8
±2
1.0
-0.8
20
-20
1
-1
0.2
V
µA
mA
µA
µA
V
mV
V
0.4
±1
V
µA
kΩ
3.6
2.2
1.9
1
V
mA
µA
DE = 0,
RE
= V
CC
, DI = V
CC
or 0
_______________________________________________________________________________________
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V ±0.3V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Driver Short-Circuit Output Current
Receiver Short-Circuit Output Current
SYMBOL
I
OSD
I
OSR
CONDITIONS
V
OUT
= -7V
V
OUT
= 12V
0
≤
V
RO
≤
V
CC
IEC 1000-4-2 Air Discharge
IEC 1000-4-2 Contact Discharge
(MAX3483E, MAX3485E,
MAX3486E, MAX3491E)
IEC 1000-4-2 Contact Discharge
(MAX3490E, MAX3488E)*
Human Body Model
MIN
TYP
MAX
-250
250
±60
UNITS
mA
mA
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
±8
±15
±8
ESD Protection for Y, Z, A, B
kV
±6
±15
*MAX3488E
and MAX3491E will be compliant to ±8kV per IEC 1000-4-2 Contact Discharge by September 1999.
DRIVER SWITCHING CHARACTERISTICS—MAX3485E/MAX3490E/MAX3491E
(V
CC
= +3.3V, T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Driver Differential Output Delay
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level
SYMBOL
t
DD
t
TD
t
PLH
t
PHL
t
PDS
t
PZL
t
PZH
t
PHZ
t
PLZ
t
PSL
t
PSH
CONDITIONS
R
L
= 60Ω, Figure 7
R
L
= 60Ω, Figure 7
R
L
= 27Ω, Figure 8
R
L
= 27Ω, Figure 8
R
L
= 27Ω, Figure 8
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 9
R
L
= 110Ω, Figure 9
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 9
MIN
12
1
3
7
7
TYP
15
22
11
23
23
-1.4
42
42
35
35
650
650
MAX
35
25
35
35
±8
90
90
80
80
900
900
UNITS
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
|
t
PLH
- t
PHL
|
Driver Propagation-Delay Skew (Note 2)
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
Driver-Output Enable Time from Shutdown to Low Level
Driver-Output Enable Time from Shutdown to High Level
DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3485E/MAX3491E only)
DRIVER SWITCHING CHARACTERISTICS—MAX3486E
(V
CC
= +3.3V, T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Driver Differential Output Delay
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level
SYMBOL
t
DD
t
TD
t
PLH
t
PHL
t
PDS
t
PZL
t
PZH
t
PHZ
t
PLZ
t
PSL
t
PSH
CONDITIONS
R
L
= 60Ω, Figure 7
R
L
= 60Ω, Figure 7
R
L
= 27Ω, Figure 8
R
L
= 27Ω, Figure 8
R
L
= 27Ω, Figure 8
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 9
R
L
= 110Ω, Figure 9
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 9
MIN
2.5
20
15
20
20
TYP
42
28
42
42
-6
52
52
40
40
700
700
MAX
70
60
75
75
±12
100
100
80
80
1000
1000
UNITS
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3
|
t
PLH
- t
PHL
|
Driver Propagation-Delay Skew (Note 2)
DRIVER-OUTPUT ENABLE/DISABLE TIMES
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
Driver-Output Enable Time from Shutdown to Low Level
Driver-Output Enable Time from Shutdown to High Level
_______________________________________________________________________________________
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
DRIVER SWITCHING CHARACTERISTICS—MAX3483E/MAX3488E
(V
CC
= +3.3V, T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Driver Differential Output Delay
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level
t
DD
t
TD
t
PLH
t
PHL
t
PDS
t
PZL
t
PZH
t
PHZ
t
PLZ
t
PSL
t
PSH
R
L
= 60Ω, Figure 7
R
L
= 60Ω, Figure 7
R
L
= 27Ω, Figure 8
R
L
= 27Ω, Figure 8
R
L
= 27Ω, Figure 8
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 9
R
L
= 110Ω, Figure 9
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 10
R
L
= 110Ω, Figure 9
SYMBOL
CONDITIONS
MIN
250
600
400
700
700
900
740
930
930
±50
900
600
50
50
1.9
2.2
1300
800
80
80
2.7
3.0
1400
1200
1500
1500
TYP
MAX
UNITS
kbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
|
t
PLH
- t
PHL
|
Driver Propagation-Delay Skew (Note 2)
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
Driver-Output Enable Time from Shutdown to Low Level
Driver-Output Enable Time from Shutdown to High Level
DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3483E only)
RECEIVER SWITCHING CHARACTERISTICS
(V
CC
= +3.3V, T
A
= +25°C.)
PARAMETER
Time to Shutdown
Receiver Propagation Delay,
Low-to-High Level
Receiver Propagation Delay,
High-to-Low Level
SYMBOL
t
SHDN
t
RPLH
t
RPHL
t
RPDS
t
PRZL
t
PRZH
t
PRHZ
t
PRLZ
t
PRSL
t
PRSH
CONDITIONS
MAX3483E/MAX3485E/MAX3486E/MAX3491E
only (Note 3)
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 11
MAX3483E/MAX3488E
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 11
MAX3483E/MAX3488E
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 11
MAX3483E/MAX3488E
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
MIN
80
25
25
25
25
TYP
190
62
75
62
75
6
12
25
25
25
25
720
720
MAX
300
90
120
90
120
±10
±20
50
50
45
45
1400
1400
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
|
t
PLH
- t
PHL
|
Receiver
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:
∆V
OD
and
∆V
OC
are the changes in V
OD
and V
OC
, respectively, when the DI input changes state.
Note 2:
Measured on
|t
PLH
(Y) - t
PHL
(Y)| and
|t
PLH
(Z) - t
PHL
(Z)|.
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
devices are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the devices are guaranteed
to have entered shutdown. See
Low-Power Shutdown Mode
section.
4
_______________________________________________________________________________________
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
MAX3483E-01
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
MAX3483E-02
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
I
RO
= 1.5mA
MAX3483E-03
25
-20
-18
-16
OUTPUT CURRENT (mA)
-14
-12
-10
-8
-6
-4
-2
3.30
3.25
OUTPUT HIGH VOLTAGE (V)
3.20
3.15
3.10
3.05
3.00
20
OUTPUT CURRENT (mA)
15
10
5
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT LOW VOLTAGE (V)
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT HIGH VOLTAGE (V)
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX3483E-04
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
MAX3483E-05
DRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs. TEMPERATURE
DIFFERENTIAL OUTPUT VOLTAGE (V)
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
R = 54Ω
MAX3483E-06
0.8
0.7
OUTPUT LOW VOLTAGE (V)
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
-20
0
20
40
100
90
80
OUTPUT CURRENT (mA)
70
60
50
40
30
20
10
0
I
RO
= 2.5mA
2.6
60
80
100
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
MAX3483E-07
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
MAX3483E-08
175
150
OUTPUT CURRENT (mA)
125
100
75
50
25
0
0
2
4
6
8
10
-100
-80
OUTPUT CURRENT (mA)
12
-60
-40
-20
0
OUTPUT LOW VOLTAGE (V)
-7 -6 -5 -4 -3 -2 -1 0 1 2 3
OUTPUT HIGH VOLTAGE (V)
4
5
_______________________________________________________________________________________
5
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