_______________General Description
The MAX1482 and MAX1483 are low-power trans-
ceivers 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 20A of supply cur-
rent. Additionally, they have a low-current shutdown
mode that consumes only 0.1A. Both parts operate
from a single +5V supply.
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 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
o
Low 20A Operating Current
o
Slew-Rate Limited for Reduced EMI and
Reduced Reflections
o
0.1A Low-Current Shutdown Mode
o
Designed for RS-485 and RS-422 Applications
o
Operate from a Single +5V Supply
o
-7V to +12V Common-Mode Input Voltage Range
o
Allows up to 256 Transceivers on the Bus--
Guaranteed (
1
/
8
-unit load)
o
Current Limiting and Thermal Shutdown for
Driver Overload Protection
______________Ordering Information
MAX1482/MAX1483
20A,
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
MAX
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
Call toll free 1-800-998-8800 for free samples or literature.
19-0367; Rev 0; 2/95
PART
MAX1482
CPD
MAX1482CSD
MAX1482EPD
-40C to +85C
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
14 Plastic DIP
14 SO
14 Plastic DIP
MAX1482ESD
-40C to +85C
14 SO
MAX1483
CPA
0C to +70C
8 Plastic DIP
MAX1483CSA
0C to +70C
8 SO
MAX1483CUA
0C to +70C
8 MAX
MAX1483EPA
-40C to +85C
8 Plastic DIP
MAX1483ESA
-40C to +85C
8 SO
MAX1482 appears at end of data sheet.
MAX1482 appears at end of data sheet.
MAX1482/MAX1483
20A,
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 (V
CC
) ...............................................................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
= +70C)
8-Pin Plastic DIP (derate 9.09mW/C above +70C) .....727mW
14-Pin Plastic DIP (derate 10.00mW/C above +70C) .800mW
8-Pin SO (derate 5.88mW/C above +70C)..................471mW
14-Pin SO (derate 8.33mW/C above +70C)................667mW
8-Pin MAX (derate 4.10mW/C above +70C) .............330mW
Operating Temperature Ranges
MAX148_C_ _ .......................................................0C to +70C
MAX148_E_ _.....................................................-40C to +85C
Storage Temperature Range .............................-65C to +160C
Lead Temperature (soldering, 10sec) .............................+300C
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5V 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
V
V
IN
= -7V
V
IN
= 12V
V
IN
= -7V
V
IN
= 12V
Input Current
(A, B)
I
IN2
V
TH
k
96
-7V
V
CM
12V
R = 27
(RS-485), Figure 1
0.4V
V
O
2.4V
R = 50
(RS-422), Figure 1
I
O
= 4mA, V
ID
= -200mV
I
O
= -4mA, V
ID
= 200mV
V
CM
= 0V
-7V
V
CM
12V
DE, DI,
R
--
E
DE, DI,
R
--
E
MAX1483,
DE = 0V, V
CC
= 0V or 5.25V
R = 27
or 50
, Figure 1
R = 27
or 50
, Figure 1
R = 27
or 50
, Figure 1
MAX1482,
DE = 0V, V
CC
= 0V or 5.25V
CONDITIONS
A
1
I
OZR
Three-State (high impedance)
Output Current at Receiver
V
0.4
V
OL
Receiver Output Low Voltage
3.5
V
OH
Receiver Output High Voltage
mV
75
V
TH
Receiver Input Hysteresis
V
-0.2
0.2
Receiver Differential Threshold
Voltage
-150
200
A
-100
150
1.5
5
V
OD2
Differential Driver Output
(with load)
V
2
5
V
5
V
OD1
Differential Driver Output (no load)
A
2
I
IN1
Logic Input Current
V
0.8
V
IL
Logic Input Low Voltage
V
0.2
V
OD
Change in Magnitude of Driver
Common-Mode Output Voltage
for Complementary Output States
V
0.2
V
OD
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
V
3
V
OC
Driver Common-Mode Output
Voltage
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
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
V
2.0
V
IH
Logic Input High Voltage
MAX1482 only,
-7V < V
Y and
V
Z
< 12V
A
50
I
OZD
Three-State (high impedance)
Output Current at Driver
MAX1482/MAX1483
20A,
1
/
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________________________________________________________________________________
3
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
SWITCHING CHARACTERISTICS
(V
CC
= 5V 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
MAX1482,
RE = 0V or V
CC
0V
V
O
V
CC
MAX1483,
RE = 0V or V
CC
DE = 0V, RE = V
CC
DI = high or low, -7V
V
O
12V (Note 2)
CONDITIONS
55
85
20
35
25
45
mA
7
95
I
OSR
Receiver Short-Circuit Current
A
20
35
I
CC
No-Load Supply Current
A
0.1
10
I
SHDN
Supply Current in Shutdown
mA
35
250
I
OSD
Driver Short-Circuit Current
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
DE = V
CC
DE = 0V
DE = V
CC
DE = 0V
Figures 4 and 6, C
L
= 15pF, S2 closed
Figures 4 and 6, C
L
= 15pF, S1 closed
Figures 4 and 6, C
L
= 100pF, S1 closed
Figures 4 and 6, C
L
= 100pF, S2 closed
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Driver Enable to Output High
t
ZH
0.2
2
Driver Output Skew to Output
t
R
, t
F
0.25
2
s
Driver Enable to Output Low
t
ZL
0.1
2
s
Driver Disable Time from Low
t
LZ
0.3
3.0
s
Driver Disable Time from High
t
HZ
0.3
3.0
s
Driver Input to Output
t
PLH
2
t
SKEW
800
s
CONDITIONS
Figures 3 and 5, R
DIFF
= 54
,
C
L1
= C
L2
= 100pF
Figures 3 and 5, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
s
Figures 3 and 5, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
Driver Rise or Fall Time
t
PHL
2
ns
Receiver Input to Output
t
PLH
, t
PHL
Figures 3 and 7, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
0.25
2.25
s
|
t
PLH
- t
PHL
|
Differential
Receiver Skew
t
SKD
Figures 3 and 7, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
160
ns
Receiver Enable to Output Low
t
ZL
Figures 2 and 8, C
RL
= 15pF, S1 closed
90
ns
Receiver Enable to Output High
t
ZH
Figures 2 and 8, C
RL
= 15pF, S2 closed
90
ns
Receiver Disable Time from Low
t
LZ
Figures 2 and 8, C
RL
= 15pF, S1 closed
90
ns
Receiver Disable Time from High
t
HZ
Figures 2 and 8, C
RL
= 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, C
L
= 100pF, S2 closed
2
s
Driver Enable from Shutdown to
Output Low
t
ZL(SHDN)
Figures 4 and 6, C
L
= 100pF, S1 closed
2
s
Receiver Enable from Shutdown
to Output High
t
ZH(SHDN)
Figures 2 and 8, C
L
= 15pF, S2 closed,
A - B = 2V
3
Receiver Enable from Shutdown
to Output Low
t
ZL(SHDN)
Figures 2 and 8, C
L
= 15pF, S1 closed,
B - A = 2V
3
s
s
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
20A,
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)
0
40
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 = 54
80
0
10
-40
-20
20
80
100
MAX1482
SUPPLY CURRENT
vs. TEMPERATURE
20
30
60
70
MAX1482-07
TEMPERATURE (C)
SUPPLY CURRENT (
A)
0
40
40
50
60
DE = V
CC
DE = 0V
0
20
40
60
80
100
120
140
0
2
4
6
10
8
12
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
3
1
5
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 (
A)
0
40
40
50
60
DE = V
CC
DE = GND
__________________________________________Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
MAX1482/MAX1483
20A,
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 (0.1A) 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 (0.1A) 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
MAX
______________________________________________________________Pin Description
MAX1482/MAX1483
20A,
1
/
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
6
_______________________________________________________________________________________
Figure 1. Driver DC Test Load
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load
Figure 2. Receiver Timing Test Load
R
R
Y
Z
V
OD
V
OC
DI
DE
3V
Y
Z
C
L1
C
L2
A
B
RO
RE
R
DIFF
V
ID
OUTPUT
UNDER TEST
500
S1
S2
V
CC
C
L
RECEIVER
OUTPUT
TEST POINT
1k
1k
S1
S2
V
CC
C
RL
15pF
_________________________________________________________________Test Circuits
MAX1482/MAX1483
20A,
1
/
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________________________________________________________________________________
7
Figure 5. Driver Propagation Delays
Figure 8. Receiver Enable and Disable Times
Figure 7. Receiver Propagation Delays
Figure 6. Driver Enable and Disable Times
DI
3V
0V
Z
Y
V
O
0V
-V
O
V
O
1.5V
t
PLH
1/2 V
O
10%
t
R
90%
90%
t
PHL
1.5V
1/2 V
O
10%
t
F
V
DIFF
= V (Y) - V (Z)
V
DIFF
t
SKEW =
| t
PLH
- t
PHL
|
V
OH
V
OL
V
ID
-V
ID
1.5V
0V
1.5V
OUTPUT
INPUT
0V
RO
A-B
t
PLH
t
PHL
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
V
CC
RO
RO
0V
1.5V
1.5V
V
OL
+ 0.5V
V
OH
- 0.5V
1.5V
1.5V
t
ZL(SHDN)
, t
ZL
t
LZ
t
ZH(SHDN)
, t
ZH
t
HZ
RE
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
Y, Z
V
OL
Y, Z
0V
1.5V
1.5V
V
OL
+ 0.5V
V
OH
- 0.5V
2.3V
2.3V
t
ZL(SHDN)
, t
ZL
t
LZ
t
ZH(SHDN)
, t
ZH
t
HZ
DE
_______________________________________________________Switching Waveforms
MAX1482/MAX1483
__________Applications Information
The MAX1482/MAX1483 are low-power transceivers for
RS-485 and RS-422 communications. The MAX1482
and MAX1483 are specified for data rates of at least
250kbps. The MAX1482 is a full-duplex transceiver
while the MAX1483 is half duplex. When disabled, the
driver and receiver outputs are high impedance.
The 96k
,
1
/
8
-unit-load receiver input impedance of the
MAX1482/MAX1483 allows up to 256 transceivers on a
bus, compared to the 1-unit load (12k
input imped-
ance) of standard RS-485 drivers (32 transceivers max-
imum). Any combination of MAX1482/MAX1483 and
other RS-485 transceivers with a total of 32 unit loads or
less can be put on the bus.
Reduced EMI and Reflections
The MAX1482/MAX1483 are slew-rate limited, minimiz-
ing EMI and reducing reflections caused by improperly
terminated cables. Figure 9 shows both the driver out-
put waveform of a MAX1482/MAX1483 transmitting a
125kHz signal and the Fourier analysis of that signal.
High-frequency harmonics have much lower ampli-
tudes, and the potential for EMI is significantly reduced.
20A,
1
/
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
8
_______________________________________________________________________________________
Figure 9. Driver Output Waveform and FFT, Transmitting
250kbps (125kHz) Signal
Figure 10. Receiver Propagation-Delay Test Circuit
Table 1. Transmitting
Table 2. Receiving
INPUTS
OUTPUTS
RE
DE
DI
Z
Y
X
X
X
1
1
0
1
0
X
0
1
High-Z
1
0
High-Z
X = Don't Care
High-Z = High Impedance
10dB/div
0Hz
500kHz/div
5MHz
TTL IN
t
R
, t
F
< 6ns
D
R
100pF
B
100pF
A
RECEIVER
OUT
R = 54
Z
Y
INPUTS
OUTPUT
RE
DE
*
A-B
RO
0
0
0
1
0
0
0
0
> +0.2V
< -0.2V
Inputs open
X
1
0
1
High-Z
X = Don't Care
High-Z = High Impedance
*
DE = 0 for MAX1483 and is a Don't Care for MAX1482.
Low-Power Shutdown Mode
A low-power shutdown mode is initiated by bringing RE
high and DE low. The devices will not shut down unless
both
the driver and receiver are disabled. In shut-
down, the devices typically draw only 0.1A of supply
current.
RE and DE may be driven simultaneously; the parts are
guaranteed not to enter shutdown if RE is high and DE
is low for less than 50ns. If the inputs are in this state for
at least 600ns, the parts are guaranteed to enter shut-
down.
For the receiver, the t
ZH
and t
ZL
enable times assume
the part was not in the low-power shutdown state. The
t
ZH(SHDN)
and t
ZL(SHDN)
enable times assume the
parts were shut down (see
Electrical Characteristics).
It takes the receivers longer to become enabled from
the low-power shutdown state (t
ZH(SHDN)
, t
ZL(SHDN)
)
than from the operating mode (t
ZH
, t
ZL
). (The parts are
in operating mode if the RE , DE inputs equal a logical
0,1 or 1,1 or 0,0.)
Driver Output Protection
Excessive output current and power dissipation caused
by faults or by bus contention are prevented by two
mechanisms. A foldback current limit on the output
stage provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
Typical Operating Characteristics). In addition, a ther-
mal shutdown circuit forces the driver outputs into a
high-impedance state if the die temperature rises
excessively.
Propagation Delay
Digital encoding schemes depend on the driver and
receiver skew. Skew is defined as the difference
between the rising and falling propagation delay times.
Typical propagation delays are shown in Figures 11
and 12 using Figure 10's test circuit.
The difference in receiver delay times, | t
PLH
- t
PHL
|, is
typically under 160ns.
The driver skew times are typically 160ns (800ns max).
MAX1482/MAX1483
20A,
1
/
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________________________________________________________________________________
9
RO
5V/div
B
A
500mV/div
500ns/div
RO
5V/div
A
B
500mV/div
500ns/div
Figure 11. Receiver t
PHL
Figure 12. Receiver t
PLH
MAX1482/MAX1483
Line Length vs. Data Rate
The RS-485/RS-422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, see
Figure 16.
Figure 13 shows the system differential voltage for the
parts driving 4000 feet of 26AWG twisted-pair wire at
110kHz into 120
loads. Even after 4000 feet of cable,
the MAX1482/MAX1483 output shows virtually no dis-
tortion.
Typical Applications
The MAX1482/MAX1483 transceivers are designed for
bidirectional data communications on multipoint bus
transmission lines. Figures 14 and 15 show typical net-
work applications circuits. These parts can also be
used as line repeaters, with cable lengths longer than
4000 feet, as shown in Figure 16.
To minimize reflections, the line should be terminated at
both ends in its characteristic impedance, and stub
lengths off the main line should be kept as short as
possible (although the slew-rate-limited MAX1482 and
MAX1483 are more tolerant of imperfect termination
than standard RS-485 ICs).
Isolated RS-485
For isolated RS-485 applications, see the MAX253 and
MAX1480 data sheets.
20A,
1
/
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
10
______________________________________________________________________________________
DI
RO
DE
RE
A
B
RE
RE
RE
RO
RO
RO
DI
DI
DI
DE
DE
DE
D
D
D
R
R
R
B
B
B
A
A
A
120
120
D
R
MAX1483
Figure 14. MAX1483 Typical Half-Duplex RS-485 Network
R
O
DI
RECEIVER
INPUT
V
Y
-V
Z
2
s/div
5
0
1
0
-1
5
0
Figure 13. System Differential Voltage at 250kbps (125kHz)
Driving 4000 Feet of Cable
MAX1482/MAX1483
20A,
1
/
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
______________________________________________________________________________________
11
120
120
R
D
RO
RE
DE
DI
A
B
Y
120
120
DI
DI
DI
RO
RO
RO
DE
DE
DE
RE
RE
RE
Z
Z
Z
Z
Y
Y
Y
A
A
A
B
B
B
D
D
D
R
R
R
NOTE: RE AND DE ON.
MAX1482
Figure 15. MAX1482 Full-Duplex RS-485 Network
Figure 16. Line Repeater for MAX1482
120
120
DATA IN
DATA OUT
R
D
RO
RE
DE
DI
A
B
Z
Y
NOTE: RE AND DE ON.
MAX1482
Rt
Rt
DE
V
CC
RE GND
V
CC
RE
GND
DE
RO
DI
9
10
12
11
B
A
Z
Y
5
RO
N.C.
DI
2
1, 8, 13
3
6, 7
14
4
D
R
D
R
MAX1482
Typical Operating Circuits
________________________(continued)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12
__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
1995 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX1482/MAX1483
20A,
1
/
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12
__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
1995 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12
__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
1995 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
________________________________________________________Package Information
L
C
A1
B
DIM
A
A1
B
C
D
E
e
H
L
MIN
0.036
0.004
0.010
0.005
0.116
0.116
0.188
0.016
0
MAX
0.044
0.008
0.014
0.007
0.120
0.120
0.198
0.026
6
MIN
0.91
0.10
0.25
0.13
2.95
2.95
4.78
0.41
0
MAX
1.11
0.20
0.36
0.18
3.05
3.05
5.03
0.66
6
INCHES
MILLIMETERS
8-PIN
MAX
MICROMAX SMALL OUTLINE
PACKAGE
0.65
0.0256
A
e
E
H
D
0.101mm
0.004 in
__________________Chip Information
____Pin Configurations (continued)
DIP/SO
TOP VIEW
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
N.C.
N.C.
A
B
Z
Y
N.C.
RO
RE
DE
DI
GND
GND
R
D
MAX1482
TRANSISTOR COUNT: 294
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