_______________General Description
The MAX3483, MAX3485, MAX3486, MAX3488,
MAX3490, and MAX3491 are 3.3V, low-power trans-
ceivers for RS-485 and RS-422 communication. Each
part contains one driver and one receiver. The
MAX3483 and MAX3488 feature slew-rate-limited dri-
vers that minimize EMI and reduce reflections caused
by improperly terminated cables, allowing error-free
data transmission at data rates up to 250kbps. The par-
tially 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 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 MAX3488, MAX3490, and MAX3491 feature full-
duplex communication, while the MAX3483, MAX3485,
and MAX3486 are designed for half-duplex communi-
cation.
________________________Applications
Low-Power RS-485/RS-422 Transceivers
Telecommunications
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
____________________________Features
o
Operate from a Single 3.3V Supply--
No Charge Pump!
o
Interoperable with +5V Logic
o
8ns Max Skew (MAX3485/MAX3490/MAX3491)
o
Slew-Rate Limited for Errorless Data Transmission
(MAX3483/MAX3488)
o
2nA Low-Current Shutdown Mode
(MAX3483/MAX3485/MAX3486/MAX3491)
o
-7V to +12V Common-Mode Input Voltage Range
o
Allows up to 32 Transceivers on the Bus
o
Full-Duplex and Half-Duplex Versions Available
o
Industry Standard 75176 Pinout
(MAX3483/MAX3485/MAX3486)
o
Current-Limiting and Thermal Shutdown for
Driver Overload Protection
______________Ordering Information
Ordering Information continued at end of data sheet.
* Contact factory for for dice specifications.
MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491
3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
19-0333; Rev 0; 12/94
PART
MAX3483
CPA
MAX3483CSA
MAX3483C/D
0C to +70C
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
PART
NUMBER
GUARANTEED
DATA RATE
(Mbps)
SUPPLY
VOLTAGE
(V)
HALF/FULL
DUPLEX
SLEW-RATE
LIMITED
DRIVER/
RECEIVER
ENABLE
SHUTDOWN
CURRENT
(nA)
PIN
COUNT
MAX3483
0.25
Half
Yes
Yes
2
8
MAX3485
10
Half
No
Yes
2
8
MAX3486
2.5
Half
Yes
Yes
2
8
MAX3488
0.25
Full
Yes
No
--
8
MAX3490
10
Full
No
No
--
8
MAX3491
10
3.0 to 3.6
Full
No
Yes
2
14
______________________________________________________________Selection Table
MAX3483EPA
MAX3483ESA
-40C to +85C
-40C to +85C
8 Plastic DIP
8 SO
MAX3485
CPA
MAX3485CSA
MAX3485C/D
0C to +70C
0C to +70C
0C to +70C
8 Plastic DIP
8 SO
Dice*
MAX3485EPA
MAX3485ESA
-40C to +85C
-40C to +85C
8 Plastic DIP
8 SO
MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491
3.3V-Powered, 10Mbps 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 Plastic DIP (derate 9.09mW/C above +70C) .....727mW
8-Pin SO (derate 5.88mW/C above +70C)..................471mW
14-Pin Plastic DIP (derate 10mW/C above +70C) ......800mW
14-Pin SO (derate 8.33mW/C above +70C)................667mW
Operating Temperature Ranges
MAX34_ _C_ _.......................................................0C to +70C
MAX34_ _E_ _ ....................................................-40C to +85C
Storage Temperature Range .............................-65C to +160C
Lead Temperature (soldering, 10sec) .............................+300C
DE = 0V,
V
CC
= 0V or 3.6V
DE = 0V, RE = V
CC
,
V
CC
= 0V or 3.6V, MAX3491
DE = 0V, RE = 0V,
V
CC
= 0V or 3.6V, MAX3491
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, 0V
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
= 0V
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
MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491
3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
_______________________________________________________________________________________
3
No load,
DI = 0V or V
CC
A
0.002
1
I
SHDN
Supply Current in Shutdown Mode
0.95
1.9
mA
1.1
2.2
I
CC
Supply Current
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
DE = 0V, RE = V
CC
, DI = V
CC
or 0V
DE = 0V,
RE = 0V
DE = V
CC
,
RE = 0V or V
CC
V
OUT
= -7V
V
OUT
= 12V
0V
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
22
35
t
PLH
Driver Propagation Delay, Low-to-High Level
ns
3
8
25
t
TD
ns
1
22
35
t
DD
Driver Differential Output Delay
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
40
80
t
PHZ
Driver Output Disable Time from High Level
ns
7
22
35
t
PHL
Driver Propagation Delay, High-to-Low Level
ns
8
t
PDS
|
t
PLH
- t
PHL
|
Driver Propagation Delay Skew (Note 2)
ns
45
90
t
PZL
Driver Output Enable Time to Low Level
ns
45
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
= 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--MAX3485, MAX3490, and MAX3491
(V
CC
= 3.3V, T
A
= +25C)
ns
40
80
t
PLZ
Driver Output Disable Time from Low Level
R
L
= 110
, Figure 10
DRIVER SWITCHING CHARACTERISTICS--MAX3486
(V
CC
= 3.3V, T
A
= +25C)
ns
45
80
t
PLZ
Driver Output Disable Time from Low Level
R
L
= 110
, Figure 10
ns
20
48
70
t
PLH
Driver Propagation Delay, Low-to-High Level
ns
15
35
60
t
TD
ns
24
48
70
t
DD
Driver Differential Output Delay
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
45
80
t
PHZ
Driver Output Disable Time from High Level
ns
20
48
70
t
PHL
Driver Propagation Delay, High-to-Low Level
ns
11
t
PDS
|
t
PLH
- t
PHL
|
Driver Propagation Delay Skew (Note 2)
ns
55
100
t
PZL
Driver Output Enable Time to Low Level
ns
55
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
= 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 OUTPUT ENABLE/DISABLE TIMES (MAX3485/MAX3491 only)
MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491
3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
4
_______________________________________________________________________________________
DRIVER SWITCHING CHARACTERISTICS--MAX3483 and MAX3488
(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
1000
1500
t
PLH
Driver Propagation Delay, Low-to-High Level
ns
400
700
1200
t
TD
ns
600
900
1400
t
DD
Driver Differential Output Delay
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
1000
1500
t
PHL
Driver Propagation Delay, High-to-Low Level
ns
100
t
PDS
|
t
PLH
- t
PHL
|
Driver Propagation Delay Skew (Note 2)
ns
900
1300
t
PZL
Driver Output Enable Time to Low Level
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
= 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
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,
MAX3483/MAX3485/MAX3486/MAX3491 only
ns
25
65
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
65
90
ns
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
= 0V to 3.0V, C
L
= 15pF, Figure 11
MAX3483/MAX3485/MAX3486/MAX3491 only
(Note 3)
C
L
= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
C
L
= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
C
L
= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
V
ID
= 0V to 3.0V, C
L
= 15pF, Figure 11
V
ID
= 0V to 3.0V, C
L
= 15pF, Figure 11
C
L
= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
C
L
= 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
CONDITIONS
25
75
120
t
RPLH
Receiver Propagation Delay,
Low-to-High Level
MAX3483/MAX3488
25
75
120
t
RPHL
Receiver Propagation Delay,
High-to-Low Level
MAX3483/MAX3488
20
t
RPDS
|
t
PLH
- t
PHL
|
Receiver
Propagation Delay Skew
MAX3483/MAX3488
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
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
Low-Power Shutdown Mode section.
DRIVER OUTPUT ENABLE/DISABLE TIMES (MAX3483 only)
MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491
3.3V-Powered, 10Mbps 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
MAX3483-01
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
MAX3483-02
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
MAX3483-03
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
MAX3483-04
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
MAX3483-07
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
MAX3483-05
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
MAX3483-06
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
MAX3483-08
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
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