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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 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
©
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
MAX3483 CPA
MAX3483CSA
MAX3483C/D
TEMP. RANGE
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX3483EPA
MAX3483ESA
-40°C to +85°C
8 Plastic DIP
8 SO
-40°C to +85°C
MAX3485 CPA
MAX3485CSA
MAX3485C/D
0°C to +70°C
8 Plastic DIP
8 SO
Dice*
0°C to +70°C
0°C to +70°C
MAX3485EPA
MAX3485ESA
-40°C to +85°C
8 Plastic DIP
8 SO
-40°C to +85°C
Ordering Information continued at end of data sheet.
* Contact factory for for dice specifications.
______________________________________________________________Selection Table
GUARANTEED
DATA RATE
(Mbps)
SUPPLY
VOLTAGE
(V)
DRIVER/
RECEIVER
ENABLE
SHUTDOWN
CURRENT
(nA)
PART
NUMBER
HALF/FULL
DUPLEX
SLEW-RATE
LIMITED
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
3.0 to 3.6
MAX3488
0.25
Full
Yes
No
—
8
MAX3490
10
Full
No
No
—
8
MAX3491
10
Full
No
Yes
2
14
________________________________________________________________ Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
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3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
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 Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
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
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R L = 100
½
(RS-422), Figure 4
2.0
Differential Driver Output
V OD
R L = 54
½
(RS-485), Figure 4
1.5
V
R L = 60
½
(RS-485), V CC = 3.3V, Figure 5
1.5
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
(Note 1)
Æ V OD
R L = 54 ½
or 100 ½ , Figure 4
0.2
V
Driver Common-Mode Output
Voltage
V OC
R L = 54 ½
or 100 ½ , Figure 4
3
V
Change in Magnitude of
Common-Mode Output Voltage
(Note 1)
Æ
V OC
R L = 54
½
or 100
½
, Figure 4
0.2
V
Input High Voltage
V IH
DE, DI, RE
2.0
V
Input Low Voltage
V IL
DE, DI, RE
0.8
V
Logic Input Current
I IN1
DE, DI, RE
±2
µA
V IN = 12V
1.0
DE = 0V,
V CC = 0V or 3.6V
Input Current (A, B)
I IN2
mA
V IN = -7V
-0.8
V OUT = 12V
20
DE = 0V, RE = 0V,
V CC = 0V or 3.6V, MAX3491
Output Leakage (Y, Z)
I O
µA
V OUT = -7V
-20
V OUT = 12V
1
Output Leakage (Y, Z)
in Shutdown Mode
DE = 0V, RE = V CC ,
V CC = 0V or 3.6V, MAX3491
I O
µA
V OUT = -7V
-1
Receiver Differential
Threshold Voltage
V TH
-7V
²
V CM ²
12V
-0.2
0.2
V
Receiver Input Hysteresis
Æ
V TH
V CM = 0V
50
mV
Receiver Output High Voltage
V OH
I OUT = -1.5mA, V ID = 200mV, Figure 6
V CC - 0.4
V
Receiver Output Low Voltage
V OL
I OUT = 2.5mA, V ID = 200mV, Figure 6
0.4
V
Three-State (High Impedance)
Output Current at Receiver
I OZR
V CC = 3.6V, 0V ²
V OUT ²
V CC
±1
µA
Receiver Input Resistance
R IN
-7V
²
V CM ²
12V
12
k
½
2
_______________________________________________________________________________________
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3.3V-Powered, 10Mbps 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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DE = V CC ,
RE = 0V or V CC
1.1
2.2
No load,
DI = 0V or V CC
Supply Current
I CC
mA
DE = 0V,
RE = 0V
0.95
1.9
Supply Current in Shutdown Mode
I SHDN
DE = 0V, RE = V CC , DI = V CC or 0V
0.002
1
µA
V OUT = -7V
V OUT = 12V
-250
Driver Short-Circuit Output
Current
I OSD
mA
250
Receiver Short-Circuit Output
Current
I OSR
0V
²
V RO
²
V CC
±8
±60
mA
DRIVER SWITCHING CHARACTERISTICS—MAX3485, MAX3490, and MAX3491
(V CC = 3.3V, T A = +25°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Driver Differential Output Delay
Driver Differential Output Transition Time
t DD
R L = 60
½
, Figure 7
1
22
35
ns
t TD
R L = 60
½
, Figure 7
3
8
25
ns
Driver Propagation Delay, Low-to-High Level
t PLH
R L = 27
½
, Figure 8
7
22
35
ns
Driver Propagation Delay, High-to-Low Level
t PHL
R L = 27
½
, Figure 8
7
22
35
ns
| t PLH - t PHL | Driver Propagation Delay Skew (Note 2)
t PDS
R L = 27
½
, Figure 8
8
ns
DRIVER OUTPUT ENABLE/DISABLE TIMES (MAX3485/MAX3491 only)
Driver Output Enable Time to Low Level
t PZL
R L = 110
½
, Figure 10
45
90
ns
Driver Output Enable Time to High Level
t PZH
R L = 110
½
, Figure 9
45
90
ns
Driver Output Disable Time from High Level
t PHZ
R L = 110
½
, Figure 9
40
80
ns
Driver Output Disable Time from Low Level
t PLZ
R L = 110
½
, Figure 10
40
80
ns
Driver Output Enable Time from Shutdown to Low Level
t PSL
R L = 110
½
, Figure 10
650
900
ns
Driver Output Enable Time from Shutdown to High Level
t PSH
R L = 110 ½ , Figure 9
650
900
ns
DRIVER SWITCHING CHARACTERISTICS—MAX3486
(V CC = 3.3V, T A = +25°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Driver Differential Output Delay
Driver Differential Output Transition Time
t DD
R L = 60
½
, Figure 7
24
48
70
ns
t TD
R L = 60
½
, Figure 7
15
35
60
ns
Driver Propagation Delay, Low-to-High Level
t PLH
R L = 27
½
, Figure 8
20
48
70
ns
Driver Propagation Delay, High-to-Low Level
t PHL
R L = 27
½
, Figure 8
20
48
70
ns
| t PLH - t PHL | Driver Propagation Delay Skew (Note 2)
t PDS
R L = 27
½
, Figure 8
11
ns
Driver Output Enable Time to Low Level
t PZL
R L = 110
½
, Figure 10
55
100
ns
Driver Output Enable Time to High Level
t PZH
R L = 110
½
, Figure 9
55
100
ns
Driver Output Disable Time from High Level
t PHZ
R L = 110 ½ , Figure 9
45
80
ns
Driver Output Disable Time from Low Level
t PLZ
R L = 110 ½ , Figure 10
45
80
ns
Driver Output Enable Time from Shutdown to Low Level
t PSL
R L = 110 ½ , Figure 10
700
1000
ns
Driver Output Enable Time from Shutdown to High Level
t PSH
R L = 110 ½ , Figure 9
700
1000
ns
_______________________________________________________________________________________
3
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3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
DRIVER SWITCHING CHARACTERISTICS—MAX3483 and MAX3488
(V CC = 3.3V, T A = +25°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Driver Differential Output Delay
Driver Differential Output Transition Time
t DD
R L = 60
½
, Figure 7
600
900
1400
ns
t TD
R L = 60
½
, Figure 7
400
700
1200
ns
Driver Propagation Delay, Low-to-High Level
t PLH
R L = 27
½
, Figure 8
700
1000
1500
ns
Driver Propagation Delay, High-to-Low Level
t PHL
R L = 27
½
, Figure 8
700
1000
1500
ns
| t PLH - t PHL | Driver Propagation Delay Skew (Note 2)
t PDS
R L = 27
½
, Figure 8
100
ns
DRIVER OUTPUT ENABLE/DISABLE TIMES (MAX3483 only)
Driver Output Enable Time to Low Level
t PZL
R L = 110
½
, Figure 10
900
1300
ns
Driver Output Enable Time to High Level
t PZH
R L = 110
½
, Figure 9
600
800
ns
Driver Output Disable Time from High Level
t PHZ
R L = 110
½
, Figure 9
50
80
ns
Driver Output Disable Time from Low Level
t PLZ
R L = 110 ½ , Figure 10
50
80
ns
Driver Output Enable Time from Shutdown to Low Level
t PSL
R L = 110 ½ , Figure 10
1.9
2.7
µs
Driver Output Enable Time from Shutdown to High Level
t PSH
R L = 110 ½ , Figure 9
2.2
3.0
µs
RECEIVER SWITCHING CHARACTERISTICS
(V CC = 3.3V, T A = +25°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3483/MAX3485/MAX3486/MAX3491 only
(Note 3)
Time to Shutdown
t SHDN
80
190
300
ns
V ID = 0V to 3.0V, C L = 15pF, Figure 11
25
65
90
Receiver Propagation Delay,
Low-to-High Level
t RPLH
ns
MAX3483/MAX3488
25
75
120
V ID = 0V to 3.0V, C L = 15pF, Figure 11
25
65
90
Receiver Propagation Delay,
High-to-Low Level
t RPHL
ns
MAX3483/MAX3488
25
75
120
V ID = 0V to 3.0V, C L = 15pF, Figure 11
10
| t PLH - t PHL | Receiver
Propagation Delay Skew
t RPDS
ns
MAX3483/MAX3488
20
Receiver Output Enable Time
to Low Level
C L = 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
C L = 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
t PRZL
25
50
ns
Receiver Output Enable Time
to High Level
t PRZH
25
50
ns
Receiver Output Disable
Time from High Level
C L = 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
t PRHZ
25
45
ns
Receiver Output Disable
Time from Low Level
C L = 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
t PRLZ
25
45
ns
Receiver Output Enable Time
from Shutdown to Low Level
C L = 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
t PRSL
720
1400
ns
Receiver Output Enable Time
from Shutdown to High Level
C L = 15pF, Figure 12,
MAX3483/MAX3485/MAX3486/MAX3491 only
t PRSH
720
1400
ns
Note 1:
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 Modesection.
Æ
V OD and
Æ
4
_______________________________________________________________________________________
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3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
__________________________________________Typical Operating Characteristics
(V CC = 3.3V, T A = +25°C, unless otherwise noted.)
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
25
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
3.30
I RO = 1.5mA
3.25
20
3.20
15
3.15
10
3.10
5
3.05
0
3.00
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
-40
-20
0
20
40
60
80
100
OUTPUT LOW VOLTAGE (V)
OUTPUT HIGH VOLTAGE (V)
TEMPERATURE (°C)
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
DRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs.TEMPERATURE
0.8
100
90
80
70
60
50
40
30
20
10
0
2.6
2.5
I RO = 2.5mA
R = 54 W
0.7
2.4
0.6
2.3
0.5
2.2
2.1
0.4
2.0
0.3
1.9
0.2
1.8
0.1
1.7
0
1.6
-40
-20
0
20
40
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
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
175
-100
150
-80
125
-60
100
75
-40
50
-20
25
0
0
0
2
4
6
8
10
12
0
1
2
3
4
5
-7
-6
-5
-4
-3
-2
-1
OUTPUT LOW VOLTAGE (V)
OUTPUT HIGH VOLTAGE (V)
_______________________________________________________________________________________
5
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