MAXIM MAX1482, MAX1483 Technical data
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_______________General Description
The MAX1482 and MAX1483 are low-power transceivers for RS-485 and RS-422 communication. Both
feature slew-rate-limited drivers that minimize EMI and
reduce reflections caused by improperly terminated
cables. Data rates are guaranteed up to 250kbps.
The MAX1482/MAX1483 draw only 20µA of supply current. Additionally, they have a low-current shutdown
mode that consumes only 0.1µA. Both parts operate
from a single +5V supply.
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 the input
is open circuit.
The MAX1482 is full duplex and the MAX1483 is half
duplex. Both parts have a 1⁄8-unit-load input impedance
that guarantees up to 256 transceivers on the bus.
________________________Applications
Low-Power RS-485/RS-422 Networks
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Large 256-Node LANs
____________________________Features
♦ Low 20µA Operating Current
♦ Slew-Rate Limited for Reduced EMI and
Reduced Reflections
♦ 0.1µA Low-Current Shutdown Mode
♦ Designed for RS-485 and RS-422 Applications
♦ Operate from a Single +5V Supply
♦ -7V to +12V Common-Mode Input Voltage Range
♦ Allows up to 256 Transceivers on the Bus—
Guaranteed (
1
⁄8-unit load)
♦ Current Limiting and Thermal Shutdown for
Driver Overload Protection
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
1
2
3
4
8
7
6
5
V
CC
B
A
GND
DI
DE
RE
RO
DIP/SO
R
D
1
2
3
4
8
7
6
5
V
CC
A
GND
DE
RE
B
RO
µMAX
DI
MAX1483
_________________Pin Configurations
MAX1483
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM
DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.
TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.
1
2
3
4
8
5
V
CC
+5V
GND
DI
DE
RE
RO
R
D
Rt
Rt
7
6
D
R
DE
RE
DI
RO
A
B
B
A
_________Typical Operating Circuits
19-0367; Rev 1; 5/06
MAX1482 appears at end of data sheet.
MAX1482 appears at end of data sheet.
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
MAX1482CPD
14 PDIP
P14-3
MAX1482CSD
14 SO
S14-4
MAX1482EPD
14 PDIP
P14-3
MAX1482ESD
14 SO
S14-4
MAX1483CPA
8 PDIP P8-1
MAX1483CSA
8 SO S8-5
MAX1483CUA
8 µMAX
®
U8-1
MAX1483EPA
8 PDIP P8-1
MAX1483ESA
8 SO S8-5
Ordering Information
µMAX is a registered trademark of Maxim Integrated products, Inc.
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
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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 (VCC)...............................................................7V
Control Input Voltages (RE, DE) .................-0.5V to (V
CC
+ 0.5V)
Driver Input Voltage (DI).............................-0.5V to (V
CC
+ 0.5V)
Driver Output Voltages ..........................................-7.5V to 12.5V
Receiver Input Voltages (A, B) ..............................-7.5V to 12.5V
Receiver Output Voltage (RO)....................-0.5V to (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) .800mW
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)................667mW
8-Pin µMAX (derate 4.10mW/°C above +70°C) .............330mW
Operating Temperature Ranges
MAX148_C_ _ .......................................................0°C to +70°C
MAX148_E_ _.....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
DC ELECTRICAL CHARACTERISTICS
(VCC= 5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
V
VIN= -7V
VIN= 12V
VIN= -7V
VIN= 12V
Input Current
(A, B)
I
IN2
V
TH
kΩ96-7V ≤ VCM≤ 12V
R = 27Ω (RS-485), Figure 1
0.4V ≤ VO≤ 2.4V
R = 50Ω (RS-422), Figure 1
IO = 4mA, VID= -200mV
IO= -4mA, VID= 200mV
VCM= 0V
-7V ≤ VCM≤ 12V
DE, DI, –R—E
–
DE, DI, –R—E
–
MAX1483,
DE = 0V, VCC= 0V or 5.25V
R = 27Ω or 50Ω, Figure 1
R = 27Ω or 50Ω, Figure 1
R = 27Ω or 50Ω, Figure 1
MAX1482,
DE = 0V, VCC= 0V or 5.25V
CONDITIONS
µA±1I
OZR
Three-State (high impedance)
Output Current at Receiver
V
0.4V
OL
Receiver Output Low Voltage
3.5V
OH
Receiver Output High Voltage
mV75∆V
TH
Receiver Input Hysteresis
V-0.2 0.2
Receiver Differential Threshold
Voltage
-150
200
µA
-100
150
1.5 5
V
OD2
Differential Driver Output
(with load)
V
25
V5V
OD1
Differential Driver Output (no load)
µA±2I
IN1
Logic Input Current
V0.8V
IL
Logic Input Low Voltage
V0.2∆V
OD
Change in Magnitude of Driver
Common-Mode Output Voltage
for Complementary Output States
V0.2∆V
OD
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
V3V
OC
Driver Common-Mode Output
Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
R
IN
Receiver Input Resistance
Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device
ground unless otherwise specified.
DE, DI, –R—E
–
V2.0V
IH
Logic Input High Voltage
MAX1482 only,
-7V < V
Y andVZ
< 12V
µA±50I
OZD
Three-State (high impedance)
Output Current at Driver
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC= 5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
SWITCHING CHARACTERISTICS
(VCC= 5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MAX1482,
RE = 0V or V
CC
0V ≤ VO≤ V
CC
MAX1483,
RE = 0V or V
CC
DE = 0V, RE = V
CC
DI = high or low, -7V ≤ VO≤ 12V (Note 2)
CONDITIONS
55 85
20 35
25 45
mA±7 ±95I
OSR
Receiver Short-Circuit Current
µA
20 35
I
CC
No-Load Supply Current
µA0.1 10I
SHDN
Supply Current in Shutdown
mA35 250I
OSD
Driver Short-Circuit Current
UNITSMIN TYP MAXSYMBOLPARAMETER
DE = V
CC
DE = 0V
DE = V
CC
DE = 0V
Figures 4 and 6, CL= 15pF, S2 closed
Figures 4 and 6, CL= 15pF, S1 closed
Figures 4 and 6, CL= 100pF, S1 closed
Figures 4 and 6, CL= 100pF, S2 closed
PARAMETER SYMBOL MIN TYP MAX UNITS
Driver Enable to Output High t
ZH
0.2 2
Driver Output Skew to Output
tR, t
F
0.25 2 µs
Driver Enable to Output Low t
ZL
0.1 2
µs
Driver Disable Time from Low t
LZ
0.3 3.0 µs
Driver Disable Time from High t
HZ
0.3 3.0 µs
Driver Input to Output
t
PLH
2
t
SKEW
800
µs
CONDITIONS
Figures 3 and 5, R
DIFF
= 54Ω,
CL1= CL2= 100pF
Figures 3 and 5, R
DIFF
= 54Ω, CL1= CL2= 100pF
µs
Figures 3 and 5, R
DIFF
= 54Ω, CL1= CL2= 100pF
Driver Rise or Fall Time
t
PHL
2
ns
Receiver Input to Output t
PLH
,
t
PHL
Figures 3 and 7, R
DIFF
= 54Ω, CL1= CL2= 100pF 0.25 2.25 µs
| t
PLH
- t
PHL
| Differential
Receiver Skew
t
SKD
Figures 3 and 7, R
DIFF
= 54Ω, CL1= CL2= 100pF 160 ns
Receiver Enable to Output Low t
ZL
Figures 2 and 8, CRL= 15pF, S1 closed 90 ns
Receiver Enable to Output High t
ZH
Figures 2 and 8, CRL= 15pF, S2 closed 90 ns
Receiver Disable Time from Low t
LZ
Figures 2 and 8, CRL= 15pF, S1 closed 90 ns
Receiver Disable Time from High t
HZ
Figures 2 and 8, CRL= 15pF, S2 closed 90 ns
Maximum Data Rate f
MAX
250 kbps
Time to Shutdown t
SHDN
(Note 3) 50 200 600 ns
Driver Enable from Shutdown to
Output High
t
ZH(SHDN)
Figures 4 and 6, CL= 100pF, S2 closed 2 µs
Driver Enable from Shutdown to
Output Low
t
ZL(SHDN)
Figures 4 and 6, CL= 100pF, S1 closed 2 µs
Receiver Enable from Shutdown
to Output High
t
ZH(SHDN)
Figures 2 and 8, CL= 15pF, S2 closed,
A - B = 2V
3
Receiver Enable from Shutdown
to Output Low
t
ZL(SHDN)
Figures 2 and 8, CL= 15pF, S1 closed,
B - A = 2V
3
µs
µs
Note 2: Applies to peak current. See Typical Operating Characteristics.
Note 3: The MAX1482/MAX1483 are put into shutdown by bringing–R—E–high and DE low. If the inputs are in this state for less
than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are
guaranteed to have entered shutdown. See Low-Power Shutdown Mode section.
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
4 _______________________________________________________________________________________
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
MAX1482-01
800
-40 -20 0 20 40 60 80 100
900
1000
1100
1200
1300
1400
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
1200
400
500
-40 -20 20 80 100
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
600
700
1000
1100
MAX1482-02
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY (ns)
040
800
900
60
0
10
20
30
40
50
60
70
80
90
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
MAX1482-03
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
MAX1482-04
1.5
2.0
2.5
3.0
3.5
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
R = 54Ω
80
0
10
-40 -20 20 80 100
MAX1482
SUPPLY CURRENT
vs. TEMPERATURE
20
30
60
70
MAX1482-07
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
040
40
50
60
DE = V
CC
DE = 0V
0
20
40
60
80
100
120
140
0246 10812
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
MAX1482-05
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
0
20
40
60
80
100
120
-7 -6 -4 -2 0 2 4-5 -3 -1 315
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
MAX1482-06
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
80
0
10
-40 -20 20 80 100
MAX1483
SUPPLY CURRENT
vs. TEMPERATURE
20
30
60
70
MAX1482-08
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
040
40
50
60
DE = V
CC
DE = GND
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________________________________________________________________________________ 5
PIN
1, 8, 13
MAX1482
DIP/SO
FUNCTION
2 1
Receiver Output. With the receiver output enabled (RE low), RO is high if
A > B by 200mV or when A and B are not connected, and RO is low if A < B
by 200mV.
DIP/SO
3 2
Receiver Output Enable. When RE is low, RO is enabled. When RE is high, RO
is high impedance. If RE is high and DE is low, the MAX1482/MAX1483 enter
a low-power (0.1µA) shutdown state.
4 3
Driver Output Enable. The driver outputs, A and B, (Y and Z for the MAX1482)
are enabled by bringing DE high. When DE is low, the driver outputs are high
impedance, and the devices can function as line receivers if RE is low. If RE is
high and DE is low, the parts will enter a low-power (0.1µA) shutdown state. If
the driver outputs are enabled, the devices function as line drivers.
10 — Inverting Driver Output
9 — Noninverting Driver Output
6, 7 5 Ground
5 4
Driver Input. With DE high, a low on DI forces output Y low and output Z high,
and a high on DI forces output Y high and output Z low.
14 8 Positive Supply: 4.75V to 5.25V
11 — Inverting Receiver Input
— 7 Inverting Receiver Input and Inverting Driver Output
12 — Noninverting Receiver Input
— 6 Noninverting Receiver Input and Noninverting Driver Output
—
MAX1483
3
4
5
—
—
7
6
2
—
1
—
8
—
NAME
RO
RE
DE
Z
Y
GND
DI
V
CC
B
B
A
A
N.C. No Connect—not internally connected
µMAX
______________________________________________________________Pin Description
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