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.
Applications
Telecommunications
Industrial-Control Local Area Networks
Transceivers for EMI-Sensitive Applications
Integrated Services Digital Networks
Packet Switching
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
3.3V-Powered, 15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
________________________________________________________________
Maxim Integrated Products
1
19-1474; Rev 0; 4/99
PART
MAX3483E
CSA
MAX3483ECPA
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
8 SO
8 Plastic DIP
PART
NUMBER
GUARANTEED
DATA RATE
(Mbps)
SUPPLY
VOLTAGE
(V)
HALF/FULL
DUPLEX
SLEW-RATE
LIMITED
DRIVER/
RECEIVER
ENABLE
SHUTDOWN
CURRENT
(nA)
PIN
COUNT
MAX3483E
0.25
Half
Yes
Yes
2
8
MAX3485E
12
Half
No
Yes
2
8
MAX3486E
2.5
Half
Yes
Yes
2
8
MAX3488E
0.25
Full
Yes
No
--
8
MAX3490E
12
Full
No
No
--
8
MAX3491E
12
3.0 to 3.6
Full
No
Yes
2
14
Selector Guide
MAX3483EESA
MAX3483EEPA
-40C to +85C
-40C to +85C
8 SO
8 Plastic DIP
MAX3485E
CSA
MAX3485ECPA
0C to +70C
0C to +70C
8 SO
8 Plastic DIP
MAX3485EESA
MAX3485EEPA
-40C to +85C
-40C to +85C
8 SO
8 Plastic DIP
Ordering Information
Ordering Information continued at end of data sheet.
15kV
ESD
PROTECTION
Yes
Yes
Yes
Yes
Yes
Yes
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.
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V-Powered, 15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
= +25C.)
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 (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
= +70C)
8-Pin SO (derate 5.88mW/C above +70C)..................471mW
8-Pin Plastic DIP (derate 9.09mW/C above +70C) .....727mW
14-Pin SO (derate 8.33mW/C above +70C)................667mW
14-Pin Plastic DIP (derate 10mW/C above +70C) ......800mW
Operating Temperature Ranges
MAX34_ _ EC_ _ ...................................................0C to +70C
MAX34_ _ EE_ _.................................................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
DE = 0,
V
CC
= 0 or 3.6V
DE = 0, RE = V
CC
,
V
CC
= 0 or 3.6V, MAX3491E
DE = 0, RE = 0,
V
CC
= 0 or 3.6V, MAX3491E
k
12
R
IN
Receiver Input Resistance
A
1
I
OZR
Three-State (High-Impedance)
Output Current at Receiver
V
0.4
V
OL
Receiver Output Low Voltage
V
V
CC
- 0.4
V
OH
Receiver Output High Voltage
mV
50
V
TH
Receiver Input Hysteresis
V
-0.2
0.2
V
TH
Receiver Differential
Threshold Voltage
A
-1
I
O
Output Leakage (Y, Z)
in Shutdown Mode
1
A
-20
I
O
Output Leakage (Y, Z)
V
0.2
V
OD
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
(Note 1)
V
1.5
V
OD
2.0
Differential Driver Output
20
mA
-0.8
I
IN2
Input Current (A, B)
1.0
A
2
I
IN1
Logic Input Current
V
3
V
OC
Driver Common-Mode Output
Voltage
V
0.2
V
OC
Change in Magnitude of
Common-Mode Output Voltage
(Note 1)
V
2.0
V
IH
Input High Voltage
V
0.8
V
IL
Input Low Voltage
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
R
L
= 54
or 100
, Figure 4
-7V
V
CM
12V
R
L
= 54
(RS-485), Figure 4
V
CC
= 3.6V, 0
V
OUT
V
CC
R
L
= 100
(RS-422), Figure 4
I
OUT
= 2.5mA, V
ID
= 200mV, Figure 6
I
OUT
= -1.5mA, V
ID
= 200mV, Figure 6
V
CM
= 0
V
OUT
= 12V
V
IN
= -7V
-7V
V
CM
12V
V
OUT
= -7V
V
IN
= 12V
DE, DI, RE
R
L
= 54
or 100
, Figure 4
R
L
= 54
or 100
, Figure 4
DE, DI, RE
V
OUT
= 12V
DE, DI, RE
V
OUT
= -7V
CONDITIONS
R
L
= 60
(RS-485), V
CC
= 3.3V, Figure 5
1.5
mA
1.1
2.2
I
CC
Supply Current
No load,
DI = 0 or V
CC
DE = V
CC
, RE = 0 or V
CC
DE = 0, RE = 0
0.95
1.9
V
3.0
3.6
V
CC
Supply Voltage Range
A
0.002
1
I
SHDN
Supply Current in Shutdown Mode
DE = 0, RE = V
CC
, DI = V
CC
or 0
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V-Powered, 15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
_______________________________________________________________________________________
3
mA
-250
I
OSD
250
Driver Short-Circuit Output Current
mA
8
60
I
OSR
Receiver Short-Circuit Output Current
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
OUT
= -7V
V
OUT
= 12V
0
V
RO
V
CC
CONDITIONS
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
= +25C.)
ns
7
23
35
t
PLH
Driver Propagation Delay, Low-to-High Level
ns
3
11
25
t
TD
Mbps
12
15
Maximum Data Rate
Driver Differential Output Transition Time
ns
650
900
t
PSH
Driver-Output Enable Time from Shutdown to High Level
ns
650
900
t
PSL
Driver-Output Enable Time from Shutdown to Low Level
ns
35
80
t
PHZ
Driver-Output Disable Time from High Level
ns
7
23
35
t
PHL
Driver Propagation Delay, High-to-Low Level
ns
-1.4
8
t
PDS
|
t
PLH
- t
PHL
|
Driver Propagation-Delay Skew (Note 2)
ns
42
90
t
PZL
Driver-Output Enable Time to Low Level
ns
42
90
t
PZH
Driver-Output Enable Time to High Level
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
R
L
= 27
, Figure 8
R
L
= 60
, Figure 7
R
L
= 110
, Figure 9
R
L
= 110
, Figure 10
R
L
= 110
, Figure 9
R
L
= 27
, Figure 8
R
L
= 27
, Figure 8
R
L
= 110
, Figure 10
R
L
= 110
, Figure 9
CONDITIONS
DRIVER SWITCHING CHARACTERISTICS--MAX3485E/MAX3490E/MAX3491E
(V
CC
= +3.3V, T
A
= +25C.)
ns
35
80
t
PLZ
Driver-Output Disable Time from Low Level
R
L
= 110
, Figure 10
DRIVER SWITCHING CHARACTERISTICS--MAX3486E
(V
CC
= +3.3V, T
A
= +25C.)
ns
40
80
t
PLZ
Driver-Output Disable Time from Low Level
R
L
= 110
, Figure 10
ns
20
42
75
t
PLH
Driver Propagation Delay, Low-to-High Level
ns
15
28
60
t
TD
Mbps
2.5
Maximum Data Rate
Driver Differential Output Transition Time
ns
700
1000
t
PSH
Driver-Output Enable Time from Shutdown to High Level
ns
700
1000
t
PSL
Driver-Output Enable Time from Shutdown to Low Level
ns
40
80
t
PHZ
Driver-Output Disable Time from High Level
ns
20
42
75
t
PHL
Driver Propagation Delay, High-to-Low Level
ns
-6
12
t
PDS
|
t
PLH
- t
PHL
|
Driver Propagation-Delay Skew (Note 2)
ns
52
100
t
PZH
Driver-Output Enable Time to High Level
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
R
L
= 27
, Figure 8
R
L
= 60
, Figure 7
R
L
= 110
, Figure 9
R
L
= 110
, Figure 10
R
L
= 110
, Figure 9
R
L
= 27
, Figure 8
R
L
= 27
, Figure 8
R
L
= 110
, Figure 9
CONDITIONS
15
IEC 1000-4-2 Air Discharge
6
IEC 1000-4-2 Contact Discharge
(MAX3490E, MAX3488E)*
8
IEC 1000-4-2 Contact Discharge
(MAX3483E, MAX3485E,
MAX3486E, MAX3491E)
ns
1
22
35
t
DD
Driver Differential Output Delay
R
L
= 60
, Figure 7
DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3485E/MAX3491E only)
ns
20
42
70
t
DD
Driver Differential Output Delay
R
L
= 60
, Figure 7
ESD Protection for Y, Z, A, B
15
Human Body Model
kV
*
MAX3488E and MAX3491E will be compliant to 8kV per IEC 1000-4-2 Contact Discharge by September 1999.
ns
52
100
t
PZL
Driver-Output Enable Time to Low Level
R
L
= 110
, Figure 10
DRIVER-OUTPUT ENABLE/DISABLE TIMES
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V-Powered, 15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
4
_______________________________________________________________________________________
DRIVER SWITCHING CHARACTERISTICS--MAX3483E/MAX3488E
(V
CC
= +3.3V, T
A
= +25C.)
ns
50
80
t
PLZ
Driver-Output Disable Time from Low Level
R
L
= 110
, Figure 10
ns
700
930
1500
t
PLH
Driver Propagation Delay, Low-to-High Level
ns
400
740
1200
t
TD
kbps
250
Maximum Data Rate
Driver Differential Output Transition Time
s
2.2
3.0
t
PSH
Driver-Output Enable Time from Shutdown to High Level
s
1.9
2.7
t
PSL
Driver-Output Enable Time from Shutdown to Low Level
ns
50
80
t
PHZ
Driver-Output Disable Time from High Level
ns
700
930
1500
t
PHL
Driver Propagation Delay, High-to-Low Level
ns
50
t
PDS
|
t
PLH
- t
PHL
|
Driver Propagation-Delay Skew (Note 2)
ns
600
800
t
PZH
Driver-Output Enable Time to High Level
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
R
L
= 27
, Figure 8
R
L
= 60
, Figure 7
R
L
= 110
, Figure 9
R
L
= 110
, Figure 10
R
L
= 110
, Figure 9
R
L
= 27
, Figure 8
R
L
= 27
, Figure 8
R
L
= 110
, Figure 9
CONDITIONS
RECEIVER SWITCHING CHARACTERISTICS
(V
CC
= +3.3V, T
A
= +25C.)
ns
25
45
t
PRLZ
Receiver-Output Disable
Time from Low Level
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
ns
25
62
90
ns
80
190
300
t
SHDN
Time to Shutdown
ns
720
1400
t
PRSH
Receiver-Output Enable Time
from Shutdown to High Level
ns
720
1400
t
PRSL
Receiver-Output Enable Time
from Shutdown to Low Level
ns
25
45
t
PRHZ
Receiver-Output Disable
Time from High Level
ns
25
62
90
ns
6
10
ns
25
50
t
PRZL
Receiver-Output Enable Time
to Low Level
ns
25
50
t
PRZH
Receiver-Output Enable Time
to High Level
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 11
MAX3483E/MAX3485E/MAX3486E/MAX3491E
only (Note 3)
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
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 11
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 11
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
C
L
= 15pF, Figure 12,
MAX3483E/85E/86E/91E only
CONDITIONS
25
75
120
t
RPLH
Receiver Propagation Delay,
Low-to-High Level
MAX3483E/MAX3488E
25
75
120
t
RPHL
Receiver Propagation Delay,
High-to-Low Level
MAX3483E/MAX3488E
12
20
t
RPDS
|
t
PLH
- t
PHL
|
Receiver
Propagation-Delay Skew
MAX3483E/MAX3488E
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.
ns
900
1300
t
PZL
Driver-Output Enable Time to Low Level
R
L
= 110
, Figure 10
ns
600
900
1400
t
DD
Driver Differential Output Delay
R
L
= 60
, Figure 7
DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3483E only)
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V-Powered, 15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
_______________________________________________________________________________________
5
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25C, unless otherwise noted.)
25
20
15
10
5
0
0
0.5
1.0
1.5
2.0
2.5
3.5
3.0
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
MAX3483E-01
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
0
0.5
1.0
1.5
2.0
2.5
3.5
3.0
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
MAX3483E-02
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
3.00
3.05
3.10
3.15
3.20
3.25
3.30
-40
-20
0
20
40
60
100
80
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
MAX3483E-03
TEMPERATURE (C)
OUTPUT HIGH VOLTAGE (V)
I
RO
= 1.5mA
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
-40
-20
0
20
40
60
100
80
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX3483E-04
TEMPERATURE (C)
OUTPUT LOW VOLTAGE (V)
I
RO
= 2.5mA
25
0
50
75
100
125
150
175
0
2
4
6
8
10
12
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
MAX3483E-07
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0
0
0.5
1.0
1.5
2.0
2.5
3.5
3.0
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
MAX3483E-05
DIFFERENTIAL OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.6
2.5
-40
-20
0
20
40
60
100
80
DRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs. TEMPERATURE
MAX3483E-06
TEMPERATURE (C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
R = 54
0
-100
-80
-60
-40
-20
5
4
3
2
1
0
-7 -6
-3
-4
-5
-2 -1
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
MAX3483E-08
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
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