Maxim MAX1483CSA 20a, 1.8-unit-load, slew-rate-limited rs-485 transceiver Datasheet

19-0367; Rev 0; 2/95
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
________________________Applications
Low-Power RS-485/RS-422 Networks
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Large 256-Node LANs
_________Typical Operating Circuits
____________________________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
______________Ordering Information
PART
TEMP. RANGE
MAX1482CPD
0°C to +70°C
14 Plastic DIP
PIN-PACKAGE
MAX1482CSD
MAX1482EPD
MAX1482ESD
MAX1483CPA
MAX1483CSA
MAX1483CUA
MAX1483EPA
MAX1483ESA
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
14 SO
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
8 µMAX
8 Plastic DIP
8 SO
_________________Pin Configurations
TOP VIEW
RO
+5V
DE
MAX1483
RO
1
R
RE 2
VCC
D
B
Rt
8
VCC
7
B
DE 3
6
A
5
GND
8
A
DI 4
Rt
R
D
6
DE 3
DI 4
8
7 B
DI
1
RE 2
A
D
5
A
GND
DIP/SO
RO
R
RE
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.
B
1
VCC
2
7
GND
RO
3
6
DI
RE 4
5
DE
MAX1483
µMAX
MAX1482 appears at end of data sheet.
MAX1482 appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
MAX1482/MAX1483
_______________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.
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ...............................................................7V
Control Input Voltages (RE, DE) .................-0.5V to (VCC + 0.5V)
Driver Input Voltage (DI).............................-0.5V to (VCC + 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 (VCC + 0.5V)
Continuous Power Dissipation (TA = +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
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
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
Differential Driver Output (no load)
VOD1
Differential Driver Output
(with load)
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
Driver Common-Mode Output
Voltage
Change in Magnitude of Driver
Common-Mode Output Voltage
for Complementary Output States
Three-State (high impedance)
Output Current at Driver
VOD2
TYP
MAX
UNITS
5
V
R = 50Ω (RS-422), Figure 1
2
5
R = 27Ω (RS-485), Figure 1
1.5
5
V
R = 27Ω or 50Ω, Figure 1
0.2
V
VOC
R = 27Ω or 50Ω, Figure 1
3
V
∆VOD
R = 27Ω or 50Ω, Figure 1
0.2
V
±50
µA
IOZD
VIH
Logic Input Low Voltage
VIL
Logic Input Current
IIN1
Receiver Differential Threshold
Voltage
MIN
∆VOD
Logic Input High Voltage
Input Current
(A, B)
CONDITIONS
IIN2
VTH
MAX1482 only,
-7V < VY and VZ < 12V
–—–
DE, DI, RE
–—–
DE, DI, RE
–—–
DE, DI, RE
2.0
V
0.8
V
±2
µA
MAX1482,
DE = 0V, VCC = 0V or 5.25V
VIN = 12V
150
VIN = -7V
-100
MAX1483,
DE = 0V, VCC = 0V or 5.25V
VIN = 12V
200
VIN = -7V
-150
-7V ≤ VCM ≤ 12V
-0.2
0.2
µA
V
Receiver Input Hysteresis
∆VTH
VCM = 0V
Receiver Output High Voltage
VOH
IO = -4mA, VID = 200mV
Receiver Output Low Voltage
VOL
IO = 4mA, VID = -200mV
0.4
V
Three-State (high impedance)
Output Current at Receiver
IOZR
0.4V ≤ VO ≤ 2.4V
±1
µA
Receiver Input Resistance
RIN
-7V ≤ VCM ≤ 12V
75
mV
3.5
96
V
kΩ
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.
2
_______________________________________________________________________________________
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
No-Load Supply Current
SYMBOL
ICC
CONDITIONS
MIN
TYP
MAX
25
45
MAX1482,
RE = 0V or VCC
DE = VCC
DE = 0V
20
35
MAX1483,
RE = 0V or VCC
DE = VCC
55
85
DE = 0V
Supply Current in Shutdown
ISHDN
DE = 0V, RE = VCC
Driver Short-Circuit Current
IOSD
DI = high or low, -7V ≤ VO ≤ 12V (Note 2)
Receiver Short-Circuit Current
IOSR
0V ≤ VO ≤ VCC
UNITS
µA
20
35
0.1
10
µA
35
250
mA
±7
±95
mA
MAX
UNITS
SWITCHING CHARACTERISTICS
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Driver Input to Output
SYMBOL
tPLH
tPHL
CONDITIONS
MIN
TYP
2
2
800
Figures 3 and 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
µs
Driver Output Skew to Output
tSKEW
Figures 3 and 5, RDIFF = 54Ω, CL1 = CL2 = 100pF
Driver Rise or Fall Time
tR, tF
Figures 3 and 5, RDIFF = 54Ω, CL1 = CL2 = 100pF
0.25
2
µs
Figures 4 and 6, CL = 100pF, S2 closed
Figures 4 and 6, CL = 100pF, S1 closed
Figures 4 and 6, CL = 15pF, S1 closed
Figures 4 and 6, CL = 15pF, S2 closed
0.2
0.1
0.3
0.3
2
2
3.0
3.0
µs
µs
µs
µs
Figures 3 and 7, RDIFF = 54Ω, CL1 = CL2 = 100pF
0.25
2.25
µs
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Receiver Input to Output
tZH
tZL
tLZ
tHZ
tPLH, tPHL
| tPLH - tPHL | Differential
tSKD
Figures 3 and 7, RDIFF = 54Ω, CL1 = CL2 = 100pF
tZL
tZH
tLZ
tHZ
Figures 2 and 8, CRL = 15pF, S1 closed
Figures 2 and 8, CRL = 15pF, S2 closed
Figures 2 and 8, CRL = 15pF, S1 closed
Figures 2 and 8, CRL = 15pF, S2 closed
Receiver Skew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
Receiver Disable Time from High
Maximum Data Rate
Time to Shutdown
160
ns
ns
600
ns
ns
ns
ns
kbps
ns
Driver Enable from Shutdown to
tZH(SHDN) Figures 4 and 6, CL = 100pF, S2 closed
Output High
2
µs
Driver Enable from Shutdown to
tZL(SHDN)
Output Low
Figures 4 and 6, CL = 100pF, S1 closed
2
µs
Receiver Enable from Shutdown
Figures 2 and 8, CL = 15pF, S2 closed,
tZH(SHDN)
to Output High
A - B = 2V
3
µs
Receiver Enable from Shutdown
tZL(SHDN)
to Output Low
3
µs
fMAX
tSHDN
(Note 3)
Figures 2 and 8, CL = 15pF, S1 closed,
B - A = 2V
90
90
90
90
250
50
200
Note 2: Applies to peak current. See Typical Operating Characteristics.
–—–
Note 3: The MAX1482/MAX1483 are put into shutdown by bringing RE 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.
_______________________________________________________________________________________
3
MAX1482/MAX1483
DC ELECTRICAL CHARACTERISTICS (continued)
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
1000
900
1000
900
800
700
600
500
800
-20
0
20
40
60
80
100
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
-20
2.0
80
60
0
20
40
60
80
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
120
MAX1482-05
60
40
100
60
40
0
0
2
4
6
8
10
12
-7 -6 -5 -4 -3 -2 -1 0
OUTPUT LOW VOLTAGE (V)
MAX1483
SUPPLY CURRENT
vs. TEMPERATURE
60
50
40
DE = VCC
20
70
SUPPLY CURRENT (µA)
70
DE = 0V
10
MAX1482-08
80
MAX1482-07
80
60
DE = VCC
50
40
30
DE = GND
20
10
0
0
-40
-20
0
20
40
60
TEMPERATURE (°C)
80
100
1 2
OUTPUT LOW VOLTAGE (V)
MAX1482
SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT (µA)
80
20
TEMPERATURE (°C)
30
MAX1482-03
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
80
100
20
OUTPUT VOLTAGE (V)
0
-20
30
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
20
-40
40
TEMPERATURE (°C)
100
1.5
50
100
OUTPUT CURRENT (mA)
2.5
40
120
OUTPUT CURRENT (mA)
3.0
20
0
140
MAX1482-04
R = 54Ω
60
0
-40
TEMPERATURE (°C)
3.5
70
10
400
-40
4
80
MAX1482-06
1100
1100
OUTPUT CURRENT (mA)
1200
90
MAX1482-02
1300
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
1200
DRIVER PROPAGATION DELAY (ns)
MAX1482-01
RECEIVER PROPAGATION DELAY (ns)
1400
DIFFERENTIAL OUTPUT VOLTAGE (V)
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
_______________________________________________________________________________________
3 4
5
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
PIN
MAX1482
DIP/SO
MAX1483
DIP/SO
µMAX
NAME
FUNCTION
2
1
3
RO
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.
3
2
4
RE
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
5
DE
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.
5
4
6
DI
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.
6, 7
5
7
GND
9
—
—
Y
Noninverting Driver Output
10
—
—
Z
Inverting Driver Output
Ground
—
6
8
A
Noninverting Receiver Input and Noninverting Driver Output
12
—
—
A
Noninverting Receiver Input
—
7
1
B
Inverting Receiver Input and Inverting Driver Output
11
—
—
B
Inverting Receiver Input
14
8
2
VCC
Positive Supply: 4.75V to 5.25V
1, 8, 13
—
—
N.C.
No Connect—not internally connected
_______________________________________________________________________________________
5
MAX1482/MAX1483
______________________________________________________________Pin Description
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_________________________________________________________________Test Circuits
Y
VOD
R
1k
TEST POINT
RECEIVER
OUTPUT
CRL
15pF
R
VCC
S1
1k
VOC
S2
Z
Figure 1. Driver DC Test Load
3V
DE
DI
Figure 2. Receiver Timing Test Load
CL1
Y
A
RDIFF
VID
RO
B
Z
RE
CL2
Figure 3. Driver/Receiver Timing Test Circuit
6
500Ω
S1
OUTPUT
UNDER TEST
CL
S2
Figure 4. Driver Timing Test Load
_______________________________________________________________________________________
VCC
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
3V
3V
DI
1.5V
0V
DE
1.5V
1.5V
1.5V
0V
tPHL
tPLH
1/2 VO
tZL(SHDN), tZL
Z
tLZ
Y, Z
VO
2.3V OUTPUT NORMALLY LOW
VOL
Y
1/2 VO
VO
VDIFF 0V
-VO
10%
VDIFF = V (Y) - V (Z)
tR
OUTPUT NORMALLY HIGH
Y, Z
VOH - 0.5V
2.3V
90%
90%
0V
10%
VOL + 0.5V
tZH(SHDN), tZH
tF
tHZ
tSKEW = | tPLH - tPHL |
Figure 5. Driver Propagation Delays
Figure 6. Driver Enable and Disable Times
3V
RE
1.5V
1.5V
0V
RO
A-B
VOH
1.5V
VOL
tPHL
VID
-VID
OUTPUT
0V
1.5V
tPLH
INPUT
tZL(SHDN), tZL
tLZ
VCC
RO
1.5V OUTPUT NORMALLY LOW
RO
1.5V
VOL + 0.5V
0V
OUTPUT NORMALLY HIGH
VOH - 0.5V
0V
tZH(SHDN), tZH
Figure 7. Receiver Propagation Delays
tHZ
Figure 8. Receiver Enable and Disable Times
_______________________________________________________________________________________
7
MAX1482/MAX1483
_______________________________________________________Switching Waveforms
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
100pF
Z
TTL IN
tR, tF < 6ns
B
RECEIVER
OUT
R
D
R = 54Ω
Y
A
10dB/div
100pF
0Hz
500kHz/div
5MHz
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
INPUTS
OUTPUT
RE
DE
DI
Z
Y
RE
DE*
A-B
RO
X
1
1
0
1
0
0
> +0.2V
1
X
1
0
1
0
0
0
< -0.2V
0
X
0
X
High-Z
High-Z
0
0
Inputs open
1
1
0
X
High-Z
X = Don't Care
High-Z = High Impedance
X = Don't Care
High-Z = High Impedance
* DE = 0 for MAX1483 and is a Don't Care for MAX1482.
__________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 96kΩ, 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 (12kΩ input impedance) of standard RS-485 drivers (32 transceivers maximum). 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.
8
Reduced EMI and Reflections
The MAX1482/MAX1483 are slew-rate limited, minimizing EMI and reducing reflections caused by improperly
terminated cables. Figure 9 shows both the driver output waveform of a MAX1482/MAX1483 transmitting a
125kHz signal and the Fourier analysis of that signal.
High-frequency harmonics have much lower amplitudes, and the potential for EMI is significantly reduced.
_______________________________________________________________________________________
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
B
500mV/div
500mV/div
B
A
RO
5V/div
5V/div
RO
500ns/div
500ns/div
Figure 11. Receiver tPHL
MAX1482/MAX1483
A
Figure 12. Receiver tPLH
Low-Power Shutdown Mode
Driver Output Protection
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 shutdown, the devices typically draw only 0.1µA 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 shutdown.
For the receiver, the tZH and tZL 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 (tZH(SHDN), tZL(SHDN))
than from the operating mode (tZH, tZL). (The parts are
in operating mode if the RE , DE inputs equal a logical
0,1 or 1,1 or 0,0.)
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 circuits over the whole common-mode voltage range (see
Typical Operating Characteristics). In addition, a thermal 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, | tPLH - tPHL |, is
typically under 160ns.
The driver skew times are typically 160ns (800ns max).
_______________________________________________________________________________________
9
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
Line Length vs. Data Rate
5
DI
0
1
RECEIVER
INPUT
VY-VZ
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 120Ω loads. Even after 4000 feet of cable,
the MAX1482/MAX1483 output shows virtually no distortion.
0
Typical Applications
-1
5
RO
0
2µs/div
Figure 13. System Differential Voltage at 250kbps (125kHz)
Driving 4000 Feet of Cable
The MAX1482/MAX1483 transceivers are designed for
bidirectional data communications on multipoint bus
transmission lines. Figures 14 and 15 show typical network 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.
120Ω
120Ω
DI
DE
B
B
D
D
DI
DE
RO
RE
A
B
A
B
A
A
R
R
RE
R
R
D
D
MAX1483
DI
DE
RO RE
DI
DE
RO RE
Figure 14. MAX1483 Typical Half-Duplex RS-485 Network
10
RO
______________________________________________________________________________________
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
MAX1482/MAX1483
A
Y
120Ω
R
RO
RE
120Ω
D
B
Z
Z
B
DI
DE
DE
DI
120Ω
D
Y
120Ω
Z
Y
B
A
Y
Z
B
A
R
R
A
R
MAX1482
D
D
DI
RE
RO
DE RE RO
DI
DE RE RO
NOTE: RE AND DE ON.
Figure 15. MAX1482 Full-Duplex RS-485 Network
Typical Operating Circuits
________________________(continued)
DE
4
MAX1482
MAX1482
A
RO
RE
R
VCC RE
VCC
14
120Ω
B
9
DATA IN
DI
5
Y
Rt
D
10
RO
R
Z
DE
12 A
Z
DI
120Ω
D
Y
RO
2
DATA OUT
R
Rt
D
11
DI
B
N.C.
1, 8, 13
3
6, 7
RE GND
GND
DE
NOTE: RE AND DE ON.
Figure 16. Line Repeater for MAX1482
______________________________________________________________________________________
11
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
____Pin Configurations (continued)
TOP VIEW
__________________Chip Information
TRANSISTOR COUNT: 294
MAX1482
N.C.
1
RO
2
14 VCC
RE
3
12 A
DE
4
11 B
DI
5
R
13 N.C.
10 Z
D
GND 6
9 Y
8 N.C.
GND 7
DIP/SO
________________________________________________________Package Information
DIM
C
α
A
0.101mm
0.004 in
e
B
A1
E
L
A
A1
B
C
D
E
e
H
L
α
INCHES
MAX
MIN
0.044
0.036
0.008
0.004
0.014
0.010
0.007
0.005
0.120
0.116
0.120
0.116
0.0256
0.198
0.188
0.026
0.016
6°
0°
MILLIMETERS
MIN
MAX
0.91
1.11
0.10
0.20
0.25
0.36
0.13
0.18
2.95
3.05
2.95
3.05
0.65
4.78
5.03
0.41
0.66
0°
6°
H
8-PIN µMAX
MICROMAX SMALL OUTLINE
PACKAGE
D
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.