19-0367; Rev 0; 2/95
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________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
______________Ordering Information
PART |
TEMP. RANGE |
PIN-PACKAGE |
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MAX1482CPD |
0°C to +70°C |
14 Plastic DIP |
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MAX1482CSD |
0°C to +70°C |
14 SO |
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MAX1482EPD |
-40°C to +85°C |
14 Plastic DIP |
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MAX1482ESD |
-40°C to +85°C |
14 SO |
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MAX1483CPA |
0°C to +70°C |
8 |
Plastic DIP |
MAX1483CSA |
0°C to +70°C |
8 SO |
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MAX1483CUA |
0°C to +70°C |
8 |
µMAX |
MAX1483EPA |
-40°C to +85°C |
8 |
Plastic DIP |
MAX1483ESA |
-40°C to +85°C |
8 SO |
_________Typical Operating Circuits
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+5V |
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DE |
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MAX1483 |
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DI |
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RO |
1 |
R |
8 |
VCC |
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D |
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RE |
2 |
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7 |
B |
B |
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Rt |
Rt |
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6 |
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DE |
3 |
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A |
A |
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RO |
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4 |
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R |
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DI |
D |
5 |
GND |
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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.
MAX1482 appears at end of data sheet.
_________________Pin Configurations
TOP VIEW |
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RO |
1 |
R |
8 |
VCC |
RE |
2 |
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7 |
B |
DE |
3 |
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6 |
A |
DI |
4 |
D |
5 |
GND |
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DIP/SO |
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B |
1 |
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8 |
A |
VCC |
2 |
MAX1483 |
7 |
GND |
RO |
3 |
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6 |
DI |
RE |
4 |
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5 |
DE |
μMAX
MAX1482 appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
MAX1482/MAX1483
Call toll free 1-800-998-8800 for free samples or literature.
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).................. |
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471mW |
14-Pin SO (derate 8.33mW/°C above +70°C)................ |
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667mW |
8-Pin µMAX (derate 4.10mW/°C above +70°C) |
.............330mW |
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Operating Temperature Ranges |
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MAX148_C_ _ ....................................................... |
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0°C to +70°C |
MAX148_E_ _..................................................... |
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- 40°C to +85°C |
Storage Temperature Range ............................. |
-65°C to +160°C |
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Lead Temperature (soldering, 10sec) ............................. |
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+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 |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Differential Driver Output (no load) |
VOD1 |
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5 |
V |
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Differential Driver Output |
VOD2 |
R = 50Ω (RS-422), Figure 1 |
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2 |
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5 |
V |
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(with load) |
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R = 27Ω (RS-485), Figure 1 |
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1.5 |
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5 |
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Change in Magnitude of Driver |
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R = 27Ω or 50Ω , Figure 1 |
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Differential Output Voltage for |
VOD |
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0.2 |
V |
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Complementary Output States |
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Driver Common-Mode Output |
VOC |
R = 27Ω or 50Ω , Figure 1 |
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3 |
V |
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Voltage |
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Change in Magnitude of Driver |
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R = 27Ω or 50Ω , Figure 1 |
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Common-Mode Output Voltage |
VOD |
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0.2 |
V |
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for Complementary Output States |
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Three-State (high impedance) |
IOZD |
MAX1482 only, |
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±50 |
µA |
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Output Current at Driver |
-7V < VY and VZ < 12V |
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–—– |
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Logic Input High Voltage |
VIH |
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2.0 |
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V |
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DE, DI, RE |
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–—– |
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Logic Input Low Voltage |
VIL |
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0.8 |
V |
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DE, DI, RE |
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–—– |
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Logic Input Current |
IIN1 |
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±2 |
µA |
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DE, DI, RE |
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MAX1482, |
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VIN = 12V |
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150 |
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Input Current |
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DE = 0V, VCC = 0V or 5.25V |
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V = -7V |
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-100 |
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IIN2 |
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IN |
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µA |
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(A, B) |
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MAX1483, |
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VIN = 12V |
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200 |
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DE = 0V, VCC = 0V or 5.25V |
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VIN = -7V |
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-150 |
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Receiver Differential Threshold |
VTH |
-7V ≤ VCM ≤ 12V |
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-0.2 |
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0.2 |
V |
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Voltage |
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Receiver Input Hysteresis |
VTH |
VCM = 0V |
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75 |
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mV |
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Receiver Output High Voltage |
VOH |
IO = -4mA, VID = 200mV |
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3.5 |
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V |
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Receiver Output Low Voltage |
VOL |
IO = 4mA, VID = -200mV |
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0.4 |
V |
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Three-State (high impedance) |
IOZR |
0.4V ≤ VO ≤ 2.4V |
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±1 |
µA |
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Output Current at Receiver |
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Receiver Input Resistance |
RIN |
-7V ≤ VCM ≤ 12V |
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96 |
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kΩ |
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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
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER |
SYMBOL |
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CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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MAX1482, |
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DE = VCC |
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25 |
45 |
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No-Load Supply Current |
ICC |
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RE |
= 0V or VCC |
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DE = 0V |
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20 |
35 |
µA |
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MAX1483, |
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DE = VCC |
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55 |
85 |
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RE |
= 0V or VCC |
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DE = 0V |
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20 |
35 |
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Supply Current in Shutdown |
ISHDN |
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DE = 0V, |
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= VCC |
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0.1 |
10 |
µA |
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RE |
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Driver Short-Circuit Current |
IOSD |
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DI = high or low, -7V ≤ VO ≤ 12V (Note 2) |
35 |
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250 |
mA |
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Receiver Short-Circuit Current |
IOSR |
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0V ≤ VO ≤ VCC |
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±7 |
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±95 |
mA |
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SWITCHING CHARACTERISTICS
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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Driver Input to Output |
tPLH |
Figures 3 and 5, RDIFF = 54Ω , |
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2 |
µs |
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tPHL |
CL1 = CL2 = 100pF |
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2 |
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Driver Output Skew to Output |
tSKEW |
Figures 3 and 5, RDIFF = 54Ω , CL1 = CL2 = 100pF |
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800 |
ns |
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Driver Rise or Fall Time |
tR, tF |
Figures 3 and 5, RDIFF = 54Ω , CL1 = CL2 = 100pF |
0.25 |
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2 |
µs |
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Driver Enable to Output High |
tZH |
Figures 4 and 6, CL = 100pF, S2 closed |
0.2 |
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2 |
µs |
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Driver Enable to Output Low |
tZL |
Figures 4 and 6, CL = 100pF, S1 closed |
0.1 |
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2 |
µs |
Driver Disable Time from Low |
tLZ |
Figures 4 and 6, CL = 15pF, S1 closed |
0.3 |
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3.0 |
µs |
Driver Disable Time from High |
tHZ |
Figures 4 and 6, CL = 15pF, S2 closed |
0.3 |
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3.0 |
µs |
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Receiver Input to Output |
tPLH, tPHL |
Figures 3 and 7, RDIFF = 54Ω , CL1 = CL2 = 100pF |
0.25 |
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2.25 |
µs |
| tPLH - tPHL | Differential |
tSKD |
Figures 3 and 7, RDIFF = 54Ω , CL1 = CL2 = 100pF |
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160 |
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Receiver Skew |
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Receiver Enable to Output Low |
tZL |
Figures 2 and 8, CRL = 15pF, S1 closed |
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90 |
ns |
Receiver Enable to Output High |
tZH |
Figures 2 and 8, CRL = 15pF, S2 closed |
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90 |
ns |
Receiver Disable Time from Low |
tLZ |
Figures 2 and 8, CRL = 15pF, S1 closed |
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90 |
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Receiver Disable Time from High |
tHZ |
Figures 2 and 8, CRL = 15pF, S2 closed |
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90 |
ns |
Maximum Data Rate |
fMAX |
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250 |
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kbps |
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Time to Shutdown |
tSHDN |
(Note 3) |
50 |
200 |
600 |
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Driver Enable from Shutdown to |
tZH(SHDN) |
Figures 4 and 6, CL = 100pF, S2 closed |
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2 |
µs |
Output High |
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Driver Enable from Shutdown to |
tZL(SHDN) |
Figures 4 and 6, CL = 100pF, S1 closed |
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2 |
µs |
Output Low |
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Receiver Enable from Shutdown |
tZH(SHDN) |
Figures 2 and 8, CL = 15pF, S2 closed, |
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3 |
µs |
to Output High |
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A - B = 2V |
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Receiver Enable from Shutdown |
tZL(SHDN) |
Figures 2 and 8, CL = 15pF, S1 closed, |
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3 |
µs |
to Output Low |
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B - A = 2V |
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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.
MAX1482/MAX1483
_______________________________________________________________________________________ 3
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
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RECEIVER PROPAGATION DELAY |
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DRIVER PROPAGATION DELAY |
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DRIVER OUTPUT CURRENT vs. |
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1400 |
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vs. TEMPERATURE |
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vs. TEMPERATURE |
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DIFFERENTIAL OUTPUT VOLTAGE |
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PROPAGATIONRECEIVERDELAY (ns) |
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MAX1482-01 |
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PROPAGATIONDRIVERDELAY (ns) |
1200 |
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MAX1482-02 |
CURRENTOUTPUT(mA) |
90 |
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MAX1482-03 |
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500 |
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1000 |
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900 |
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50 |
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800 |
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1000 |
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|
700 |
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||||
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30 |
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|||||||
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600 |
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|||||
|
900 |
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20 |
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800 |
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400 |
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0 |
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||||||||
|
-40 |
-20 |
0 |
|
20 |
40 |
60 |
|
80 |
100 |
|
|
|
-40 |
-20 |
0 |
20 |
40 60 |
80 |
100 |
|
|
0.5 |
1.0 1.5 |
2.0 |
2.5 3.0 3.5 4.0 4.5 5.0 |
||||||||||||||||||||||||||||||||||||||||||||||||||||
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|
TEMPERATURE (°C) |
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|
TEMPERATURE (°C) |
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OUTPUT VOLTAGE (V) |
|||||||||||||||||||||||||||||||||
|
DRIVER DIFFERENTIAL OUTPUT VOLTAGE |
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OUTPUT CURRENT vs. |
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OUTPUT CURRENT vs. |
|||||||||||||||||||||||||||||||||||||||||||||||
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vs. TEMPERATURE |
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|
140 |
|
|
DRIVER OUTPUT LOW VOLTAGE |
|
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|
120 |
|
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|
DRIVER OUTPUT HIGH VOLTAGE |
|||||||||||||||||||||||||||||||||||||||||||||||
(V) |
3.5 |
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MAX1482-04 |
|
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MAX1482-05 |
|
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MAX1482-06 |
|||||||
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||||||
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R = |
54Ω |
|
|
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|
120 |
|
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|
100 |
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||||||||||||
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||||||||||||||||
VOLTAGEOUTPUTDIFFERENTIAL |
3.0 |
|
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|
(mA)CURRENTOUTPUT |
100 |
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|
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|
|
(mA)CURRENTOUTPUT |
80 |
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|||||
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|||||||
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|||||||
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80 |
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|||||
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||||||
|
2.5 |
|
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60 |
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|||||
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|||||||
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60 |
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||||||
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|||||||
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40 |
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|||||
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||||||
|
2.0 |
|
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40 |
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|||||
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|||||||
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20 |
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||||||
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|||||||
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20 |
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||||||
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|||||||
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0 |
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1.5 |
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0 |
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|||||||
|
-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
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0 |
|
2 |
4 |
6 |
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|
8 |
|
10 |
|
12 |
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|
-7 -6 -5 -4 |
-3 |
-2 -1 0 1 2 3 4 5 |
||||||||||||||||||||||||||||||||||||||||||||||||||
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TEMPERATURE (°C) |
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OUTPUT LOW VOLTAGE (V) |
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OUTPUT LOW VOLTAGE (V) |
|||||||||||||||||||||||||||||||||||
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MAX1482 |
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MAX1483 |
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SUPPLY CURRENT |
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SUPPLY CURRENT |
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|||||||||||||||||||||||||||||
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vs. TEMPERATURE |
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vs. TEMPERATURE |
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|||||||||||||||||||||||||||||
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80 |
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MAX1482-07 |
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80 |
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MAX1482-08 |
|||||||||||||
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A)(μ |
70 |
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A)(μ |
70 |
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||||||||||||||||
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60 |
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60 |
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||||||
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DE = VCC |
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|||||||||||||||
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CURRENT |
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CURRENT |
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||||||||||||||
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50 |
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50 |
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||||||
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|||||
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|
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|
|
SUPPLY |
40 |
|
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SUPPLY |
40 |
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||||
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||||||||
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|||
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30 |
|
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|
DE = VCC |
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|
30 |
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||||||||||||
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||||||||||||
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20 |
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20 |
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DE = GND |
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||||||||||||
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|||||||||||||||||||
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|||||
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|
DE = 0V |
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||||||||
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||||
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10 |
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10 |
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|||
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|||||
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0 |
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0 |
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|||
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-40 |
|
-20 |
|
0 |
|
|
20 |
|
|
|
40 |
60 80 |
100 |
|
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|
|
-40 |
-20 |
0 |
20 40 |
60 |
|
|
80 |
|
100 |
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||||||||||||||||||||||||||||||||
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|||||||||||||||||||||||||||||||||||||||||
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|
|
TEMPERATURE (°C) |
|
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|
|
TEMPERATURE (°C) |
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|
|
4 _______________________________________________________________________________________