19-0122; Rev 5; 2/96
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
_______________General Description
The MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 are low-power transceivers for RS-485 and RS422 communication. Each part contains one driver and one receiver. The MAX483, MAX487, MAX488, and MAX489 feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, thus allowing error-free data transmission up to 250kbps. The driver slew rates of the MAX481, MAX485, MAX490, MAX491, and MAX1487 are not limited, allowing them to transmit up to 2.5Mbps.
These transceivers draw between 120µA and 500µA of supply current when unloaded or fully loaded with disabled drivers. Additionally, the MAX481, MAX483, and MAX487 have a low-current shutdown mode in which they consume only 0.1µA. All 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-imped- ance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit.
The MAX487 and MAX1487 feature quarter-unit-load receiver input impedance, allowing up to 128 MAX487/ MAX1487 transceivers on the bus. Full-duplex communications are obtained using the MAX488–MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are designed for half-duplex applications.
____________________________Features
♦In µMAX Package: Smallest 8-Pin SO
♦Slew-Rate Limited for Error-Free Data Transmission (MAX483/487/488/489)
♦0.1µA Low-Current Shutdown Mode (MAX481/483/487)
♦Low Quiescent Current: 120µA (MAX483/487/488/489) 230µA (MAX1487)
300µA (MAX481/485/490/491)
♦-7V to +12V Common-Mode Input Voltage Range
♦Three-State Outputs
♦30ns Propagation Delays, 5ns Skew (MAX481/485/490/491/1487)
♦Full-Duplex and Half-Duplex Versions Available
♦Operate from a Single 5V Supply
♦Allows up to 128 Transceivers on the Bus (MAX487/MAX1487)
♦Current-Limiting and Thermal Shutdown for Driver Overload Protection
________________________Applications
Low-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks
______________Ordering Information
PART |
TEMP. RANGE |
PIN-PACKAGE |
|
MAX481CPA |
0°C to +70°C |
8 |
Plastic DIP |
MAX481CSA |
0°C to +70°C |
8 SO |
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MAX481CUA |
0°C to +70°C |
8 |
µMAX |
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MAX481C/D |
0°C to +70°C |
Dice* |
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
______________________________________________________________Selection Table
PART |
HALF/FULL |
DATA RATE |
SLEW-RATE |
LOW-POWER |
RECEIVER/ |
QUIESCENT |
NUMBER OF |
PIN |
|
DRIVER |
CURRENT |
TRANSMITTERS |
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NUMBER |
DUPLEX |
(Mbps) |
LIMITED |
SHUTDOWN |
COUNT |
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ENABLE |
(μA) |
ON BUS |
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MAX481 |
Half |
2.5 |
No |
Yes |
Yes |
300 |
32 |
8 |
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MAX483 |
Half |
0.25 |
Yes |
Yes |
Yes |
120 |
32 |
8 |
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MAX485 |
Half |
2.5 |
No |
No |
Yes |
300 |
32 |
8 |
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MAX487 |
Half |
0.25 |
Yes |
Yes |
Yes |
120 |
128 |
8 |
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MAX488 |
Full |
0.25 |
Yes |
No |
No |
120 |
32 |
8 |
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MAX489 |
Full |
0.25 |
Yes |
No |
Yes |
120 |
32 |
14 |
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MAX490 |
Full |
2.5 |
No |
No |
No |
300 |
32 |
8 |
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MAX491 |
Full |
2.5 |
No |
No |
Yes |
300 |
32 |
14 |
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MAX1487 |
Half |
2.5 |
No |
No |
Yes |
230 |
128 |
8 |
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________________________________________________________________ Maxim Integrated Products 1
MAX491/MAX1487–MAX481/MAX483/MAX485/MAX487
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC).............................................................–—– |
|
12V |
Control Input Voltage (RE, DE)................... |
-0.5V to (VCC + 0.5V) |
|
Driver Input Voltage (DI)............................. |
-0.5V to (VCC + 0.5V) |
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Driver Output Voltage (A, B)................................... |
-8V to +12.5V |
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Receiver Input Voltage (A, B)................................. |
-8V to +12.5V |
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Receiver Output Voltage (RO)..................... |
-0.5V to (VCC +0.5V) |
|
Continuous Power Dissipation (TA = +70°C) |
|
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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 4.1mW/°C above +70°C) |
.............. |
830mW |
8-Pin CERDIP (derate 8.00mW/°C above +70°C)......... |
640mW |
|
14-Pin CERDIP (derate 9.09mW/°C above +70°C)....... |
727mW |
|
Operating Temperature Ranges |
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MAX4_ _C_ _/MAX1487C_ A ............................... |
0°C to +70°C |
|
MAX4_ _E_ _/MAX1487E_ A............................. |
-40°C to +85°C |
|
MAX4_ _MJ_/MAX1487MJA ........................... |
-55°C to +125°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.) (Notes 1, 2)
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) |
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2 |
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V |
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(with load) |
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R = 27Ω (RS-485), Figure 4 |
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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 4 |
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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 4 |
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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 4 |
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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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–—– |
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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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Input Low Voltage |
VIL |
–—– |
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0.8 |
V |
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DE, DI, RE |
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Input Current |
IIN1 |
–—– |
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±2 |
µA |
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DE, DI, RE |
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DE = 0V; |
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VIN = 12V |
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1.0 |
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VCC = 0V or 5.25V, |
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mA |
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Input Current |
IIN2 |
all devices except |
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VIN = -7V |
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-0.8 |
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MAX487/MAX1487 |
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(A, B) |
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MAX487/MAX1487, |
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VIN = 12V |
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0.25 |
mA |
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DE = 0V, VCC = 0V or 5.25V |
|
VIN = -7V |
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-0.2 |
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Receiver Differential Threshold |
VTH |
-7V ≤ VCM ≤ 12V |
|
-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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70 |
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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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-7V ≤ VCM ≤ 12V, all devices except |
12 |
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kΩ |
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MAX487/MAX1487 |
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Receiver Input Resistance |
RIN |
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-7V ≤ VCM ≤ 12V, MAX487/MAX1487 |
48 |
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kΩ |
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2 _______________________________________________________________________________________
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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MAX488/MAX489, |
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120 |
250 |
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–—– |
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DE, DI, RE = 0V or VCC |
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MAX490/MAX491, |
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300 |
500 |
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–—– |
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DE, DI, RE = 0V or VCC |
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MAX481/MAX485, |
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DE = VCC |
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500 |
900 |
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No-Load Supply Current |
ICC |
–—– |
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µA |
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DE = 0V |
|
300 |
500 |
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(Note 3) |
RE = 0V or VCC |
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MAX1487, |
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DE = VCC |
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300 |
500 |
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–—– |
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DE = 0V |
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230 |
400 |
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RE = 0V or VCC |
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MAX483/MAX487, |
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DE = 5V |
MAX483 |
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350 |
650 |
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MAX487 |
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250 |
400 |
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–—– |
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RE = 0V or VCC |
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DE = 0V |
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120 |
250 |
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–—– |
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Supply Current in Shutdown |
ISHDN |
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0.1 |
10 |
µA |
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MAX481/483/487, DE = 0V, RE = VCC |
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Driver Short-Circuit Current, |
IOSD1 |
-7V ≤ VO ≤ 12V (Note 4) |
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35 |
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250 |
mA |
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VO = High |
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Driver Short-Circuit Current, |
IOSD2 |
-7V ≤ VO ≤ 12V (Note 4) |
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35 |
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250 |
mA |
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VO = Low |
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Receiver Short-Circuit Current |
IOSR |
0V ≤ VO ≤ VCC |
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7 |
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95 |
mA |
SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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Driver Input to Output |
tPLH |
Figures 6 and 8, RDIFF = 54Ω , |
10 |
30 |
60 |
ns |
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tPHL |
CL1 = CL2 = 100pF |
|
10 |
30 |
60 |
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Driver Output Skew to Output |
tSKEW |
Figures 6 and 8, RDIFF = 54Ω , CL1 = CL2 = 100pF |
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5 |
10 |
ns |
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Figures 6 and 8, |
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MAX481, MAX485, MAX1487 |
3 |
15 |
40 |
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Driver Rise or Fall Time |
tR, tF |
RDIFF = 54Ω , |
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MAX490C/E, MAX491C/E |
5 |
15 |
25 |
ns |
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CL1 = CL2 = 100pF |
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MAX490M, MAX491M |
3 |
15 |
40 |
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Driver Enable to Output High |
tZH |
Figures 7 and 9, CL = 100pF, S2 closed |
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40 |
70 |
ns |
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Driver Enable to Output Low |
tZL |
Figures 7 and 9, CL = 100pF, S1 closed |
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40 |
70 |
ns |
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Driver Disable Time from Low |
tLZ |
Figures 7 and 9, CL = 15pF, S1 closed |
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40 |
70 |
ns |
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Driver Disable Time from High |
tHZ |
Figures 7 and 9, CL = 15pF, S2 closed |
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40 |
70 |
ns |
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Figures 6 and 10, |
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MAX481, MAX485, MAX1487 |
20 |
90 |
200 |
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Receiver Input to Output |
tPLH, tPHL |
RDIFF = 54Ω , |
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MAX490C/E, MAX491C/E |
20 |
90 |
150 |
ns |
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CL1 = CL2 = 100pF |
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MAX490M, MAX491M |
20 |
90 |
200 |
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| tPLH - tPHL | Differential |
tSKD |
Figures 6 and 10, RDIFF = 54Ω , |
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13 |
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ns |
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Receiver Skew |
CL1 = CL2 = 100pF |
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Receiver Enable to Output Low |
tZL |
Figures 5 and 11, CRL = 15pF, S1 closed |
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20 |
50 |
ns |
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Receiver Enable to Output High |
tZH |
Figures 5 and 11, CRL = 15pF, S2 closed |
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20 |
50 |
ns |
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Receiver Disable Time from Low |
tLZ |
Figures 5 and 11, CRL = 15pF, S1 closed |
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20 |
50 |
ns |
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Receiver Disable Time from High |
tHZ |
Figures 5 and 11, CRL = 15pF, S2 closed |
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20 |
50 |
ns |
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Maximum Data Rate |
fMAX |
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2.5 |
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Mbps |
Time to Shutdown |
tSHDN |
MAX481 (Note 5) |
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50 |
200 |
600 |
ns |
MAX491/MAX1487–MAX481/MAX483/MAX485/MAX487
_______________________________________________________________________________________ 3
MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (continued)
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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Driver Enable from Shutdown to |
tZH(SHDN) |
Figures 7 and 9, CL = 100pF, S2 closed |
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40 |
100 |
ns |
Output High (MAX481) |
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Driver Enable from Shutdown to |
tZL(SHDN) |
Figures 7 and 9, CL = 100pF, S1 closed |
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40 |
100 |
ns |
Output Low (MAX481) |
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Receiver Enable from Shutdown |
tZH(SHDN) |
Figures 5 and 11, CL = 15pF, S2 closed, |
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300 |
1000 |
ns |
to Output High (MAX481) |
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A - B = 2V |
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Receiver Enable from Shutdown |
tZL(SHDN) |
Figures 5 and 11, CL = 15pF, S1 closed, |
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300 |
1000 |
ns |
to Output Low (MAX481) |
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B - A = 2V |
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SWITCHING CHARACTERISTICS—MAX483, MAX487/MAX488/MAX489
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
|
Driver Input to Output |
tPLH |
Figures 6 and 8, RDIFF = 54Ω , |
250 |
800 |
2000 |
ns |
|
tPHL |
CL1 = CL2 = 100pF |
250 |
800 |
2000 |
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Driver Output Skew to Output |
tSKEW |
Figures 6 and 8, RDIFF = 54Ω , |
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100 |
800 |
ns |
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CL1 = CL2 = 100pF |
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Driver Rise or Fall Time |
tR, tF |
Figures 6 and 8, RDIFF = 54Ω , |
250 |
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2000 |
ns |
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CL1 = CL2 = 100pF |
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Driver Enable to Output High |
tZH |
Figures 7 and 9, CL = 100pF, S2 closed |
250 |
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2000 |
ns |
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Driver Enable to Output Low |
tZL |
Figures 7 and 9, CL = 100pF, S1 closed |
250 |
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2000 |
ns |
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Driver Disable Time from Low |
tLZ |
Figures 7 and 9, CL = 15pF, S1 closed |
300 |
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3000 |
ns |
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Driver Disable Time from High |
tHZ |
Figures 7 and 9, CL = 15pF, S2 closed |
300 |
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3000 |
ns |
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Receiver Input to Output |
tPLH |
Figures 6 and 10, RDIFF = 54Ω , |
250 |
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2000 |
ns |
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tPHL |
CL1 = CL2 = 100pF |
250 |
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2000 |
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I tPLH - tPHL I Differential |
tSKD |
Figures 6 and 10, RDIFF = 54Ω , |
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100 |
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ns |
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Receiver Skew |
CL1 = CL2 = 100pF |
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Receiver Enable to Output Low |
tZL |
Figures 5 and 11, CRL = 15pF, S1 closed |
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20 |
50 |
ns |
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Receiver Enable to Output High |
tZH |
Figures 5 and 11, CRL = 15pF, S2 closed |
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20 |
50 |
ns |
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Receiver Disable Time from Low |
tLZ |
Figures 5 and 11, CRL = 15pF, S1 closed |
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20 |
50 |
ns |
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Receiver Disable Time from High |
tHZ |
Figures 5 and 11, CRL = 15pF, S2 closed |
|
20 |
50 |
ns |
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Maximum Data Rate |
fMAX |
tPLH, tPHL < 50% of data period |
250 |
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kbps |
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Time to Shutdown |
tSHDN |
MAX483/MAX487 (Note 5) |
50 |
200 |
600 |
ns |
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Driver Enable from Shutdown to |
tZH(SHDN) |
MAX483/MAX487, Figures 7 and 9, |
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2000 |
ns |
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Output High |
CL = 100pF, S2 closed |
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Driver Enable from Shutdown to |
tZL(SHDN) |
MAX483/MAX487, Figures 7 and 9, |
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2000 |
ns |
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Output Low |
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CL = 100pF, S1 closed |
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Receiver Enable from Shutdown |
tZH(SHDN) |
MAX483/MAX487, Figures 5 and 11, |
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2500 |
ns |
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to Output High |
CL = 15pF, S2 closed |
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Receiver Enable from Shutdown |
tZL(SHDN) |
MAX483/MAX487, Figures 5 and 11, |
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2500 |
ns |
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to Output Low |
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CL = 15pF, S1 closed |
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4 _______________________________________________________________________________________
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
NOTES FOR ELECTRICAL/SWITCHING CHARACTERISTICS
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.
Note 2: All typical specifications are given for VCC = 5V and TA = +25°C.
Note 3: Supply current specification is valid for loaded transmitters when DE = 0V.
Note 4: Applies to peak current. See Typical Operating Characteristics.
–—–
Note 5: The MAX481/MAX483/MAX487 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.
__________________________________________Typical Operating Characteristics
(VCC = 5V, TA = +25°C, unless otherwise noted.)
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OUTPUT CURRENT vs. |
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OUTPUT CURRENT vs. |
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RECEIVER OUTPUT HIGH VOLTAGE vs. |
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RECEIVER OUTPUT LOW VOLTAGE |
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RECEIVER OUTPUT HIGH VOLTAGE |
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TEMPERATURE |
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45 |
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MAX481-01 |
-20 |
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MAX481-02 |
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4.8 |
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MAX481-03 |
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-18 |
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4.6 |
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40 |
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HIGHOUTPUTVOLTAGE (V) |
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IRO = 8mA |
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CURRENTOUTPUT (mA) |
35 |
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CURRENTOUTPUT (mA) |
-16 |
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4.4 |
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-4 |
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10 |
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3.4 |
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30 |
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-14 |
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4.2 |
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25 |
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-12 |
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4.0 |
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20 |
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-10 |
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3.8 |
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-8 |
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3.6 |
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-6 |
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5 |
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3.2 |
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-2 |
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0 |
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3.0 |
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0 |
0.5 |
1.0 |
1.5 |
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2.0 |
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2.5 |
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1.5 |
2.0 |
2.5 3.0 3.5 4.0 |
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4.5 |
5.0 |
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-50 |
-25 |
0 |
25 |
50 |
75 |
100 |
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125 |
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OUTPUT LOW VOLTAGE (V) |
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OUTPUT HIGH VOLTAGE (V) |
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TEMPERATURE (°C) |
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|
RECEIVER OUTPUT LOW VOLTAGE vs. |
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DRIVER OUTPUT CURRENT vs. |
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DRIVER DIFFERENTIAL OUTPUT VOLTAGE |
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TEMPERATURE |
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DIFFERENTIAL OUTPUT VOLTAGE |
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vs. TEMPERATURE |
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0.9 |
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MAX481-04 |
90 |
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MAX481-05 |
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2.4 |
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-06 |
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0.8 |
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IRO = 8mA |
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80 |
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(V) |
2.3 |
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R = 54 |
Ω |
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MAX481 |
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(V)VOLTAGELOWOUTPUT |
0.1 |
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(mA)CURRENTOUTPUT |
10 |
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VOLTAGEOUTPUTDIFFERENTIAL |
1.6 |
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0.7 |
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70 |
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2.2 |
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0.6 |
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60 |
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2.1 |
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0.5 |
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50 |
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2.0 |
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0.4 |
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40 |
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1.9 |
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0.3 |
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30 |
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1.8 |
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0.2 |
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20 |
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1.7 |
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0 |
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0 |
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1.5 |
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-50 |
-25 |
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0 25 |
50 75 |
100 |
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125 |
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0 |
0.5 |
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1.0 1.5 2.0 2.5 3.0 3.5 |
4.0 |
4.5 |
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-50 |
-25 |
0 |
25 |
50 |
75 |
100 |
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125 |
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TEMPERATURE (°C) |
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DIFFERENTIAL OUTPUT VOLTAGE (V) |
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TEMPERATURE (°C) |
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MAX491/MAX1487–MAX481/MAX483/MAX485/MAX487
_______________________________________________________________________________________ 5