19-1138; Rev 1; 12/97
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
General Description
The MAX3080–MAX3089 high-speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). The MAX3080/MAX3081/MAX3082 feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 115kbps. The MAX3083/MAX3084/MAX3085 offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. The MAX3086/MAX3087/MAX3088’s driver slew rates are not limited, making transmit speeds up to 10Mbps possible. The MAX3089’s slew rate is selectable between 115kbps, 500kbps, and 10Mbps by driving a selector pin with a single three-state driver.
These transceivers typically draw 375µA of supply current when unloaded, or when fully loaded with the drivers disabled.
All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The MAX3082/MAX3085/MAX3088 are intended for halfduplex communications, while the MAX3080/MAX3081/ MAX3083/MAX3084/MAX3086/MAX3087 are intended for full-duplex communications. The MAX3089 is selectable between half-duplex and full-duplex operation. It also features independently programmable receiver and transmitter output phase via separate pins.
Features
♦True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility
♦Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission (MAX3080–MAX3085/MAX3089)
♦1nA Low-Current Shutdown Mode (except MAX3081/MAX3084/MAX3087)
♦Pin-Selectable Full/Half-Duplex Operation (MAX3089)
♦Phase Controls to Correct for Twisted-Pair Reversal (MAX3089)
♦Allow Up to 256 Transceivers on the Bus
Applications
RS-422/RS-485 Communications
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Ordering Information
PART |
TEMP. RANGE |
PIN-PACKAGE |
MAX3080CPD |
0°C to +70°C |
14 Plastic DIP |
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MAX3080CSD |
0°C to +70°C |
14 SO |
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MAX3080EPD |
-40°C to +85°C |
14 Plastic DIP |
MAX3080ESD |
-40°C to +85°C |
14 SO |
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Ordering Information continued on last page.
Selection Table
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Half/Full |
Data |
Slew |
Low- |
Receiver/ |
Quiescent |
Transceivers |
Pin |
Industry- |
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Part |
Rate |
Rate |
Power |
Driver |
Current |
On |
Standard |
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Duplex |
Count |
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(Mbps) |
Limited |
Shutdown |
Enable |
(µA) |
Bus |
Pinout |
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MAX3080 |
Full |
0.115 |
Yes |
Yes |
Yes |
375 |
256 |
14 |
75180 |
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MAX3081 |
Full |
0.115 |
Yes |
No |
No |
375 |
256 |
8 |
75179 |
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MAX3082 |
Half |
0.115 |
Yes |
Yes |
Yes |
375 |
256 |
8 |
75176 |
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MAX3083 |
Full |
0.5 |
Yes |
Yes |
Yes |
375 |
256 |
14 |
75180 |
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MAX3084 |
Full |
0.5 |
Yes |
No |
No |
375 |
256 |
8 |
75179 |
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MAX3085 |
Half |
0.5 |
Yes |
Yes |
Yes |
375 |
256 |
8 |
75176 |
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MAX3086 |
Full |
10 |
No |
Yes |
Yes |
375 |
256 |
14 |
75180 |
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MAX3087 |
Full |
10 |
No |
No |
No |
375 |
256 |
8 |
75179 |
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MAX3088 |
Half |
10 |
No |
Yes |
Yes |
375 |
256 |
8 |
75176 |
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MAX3089 |
Selectable |
Selectable |
Selectable |
Yes |
Yes |
375 |
256 |
14 |
75180* |
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*Pin-compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13.
________________________________________________________________ Maxim Integrated Products 1
MAX3089–MAX3080
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ............................................................ |
+7V |
Control Input Voltage (RE, DE)................... |
-0.3V to (VCC + 0.3V) |
Special Input Voltage |
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(H/F, SRL, TXP, RXP).................................. |
-0.3V to (VCC + 0.3V) |
Driver Input Voltage (DI)............................. |
-0.3V to (VCC + 0.3V) |
Driver Output Voltage (A, B, Y, Z)........................................ |
±13V |
Receiver Input Voltage (A, B) .............................................. |
±13V |
Receiver Input Voltage, Full Duplex (A, B) .......................... |
±25V |
Receiver Output Voltage (RO).................... |
-0.3V to (VCC + 0.3V) |
Continuous Power Dissipation |
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8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) |
...727mW |
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8-Pin SO (derate 5.88mW/°C above +70°C) |
................ |
471mW |
14-Pin Plastic DIP (derate 10.0mW/°C above ....+70°C) |
800mW |
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14-Pin SO (derate 8.33mW/°C above +70°C).............. |
667mW |
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Operating Temperature Ranges |
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MAX308_C_ _ ..................................................... |
0°C to +70°C |
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MAX308_E_ _................................................... |
- 40°C to +85°C |
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Storage Temperature Range ............................. |
- 65°C to +150°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 VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER |
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SYMBOL |
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CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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DRIVER |
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Differential Driver Output |
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VOD1 |
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Figure 5 |
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5 |
V |
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(no load) |
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Differential Driver Output |
VOD2 |
Figure 5, R = 50Ω (RS-422) |
2.0 |
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V |
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Figure 5, R = 27Ω (RS-485) |
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1.5 |
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Change in Magnitude of |
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Figure 5, R = 50Ω or R = 27Ω |
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Differential Output Voltage |
VOD |
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0.2 |
V |
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(Note 2) |
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Driver Common-Mode Output |
VOC |
Figure 5, R = 50Ω or R = 27Ω |
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3 |
V |
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Voltage |
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Change In Magnitude of |
VOC |
Figure 5, R = 50Ω or R = 27Ω |
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0.2 |
V |
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Common-Mode Voltage (Note 2) |
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Input High Voltage |
VIH1 |
DE, DI, RE, H/F, TXP, RXP |
2.0 |
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V |
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Input Low Voltage |
VIL1 |
DE, DI, RE, H/F, TXP, RXP |
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0.8 |
V |
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DI Input Hysteresis |
VHYS |
MAX3080–MAX3085, and MAX3089 with |
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100 |
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mV |
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SRL = VCC or unconnected |
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SRL Input Current |
IIN1 |
DE, DI, RE |
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±2 |
µA |
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IIN2 |
H/F, TXP, RXP, internal pull-down |
10 |
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40 |
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Input High Voltage |
VIH2 |
SRL |
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VCC - 0.8 |
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V |
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Input Middle Voltage |
VIM2 |
SRL (Note 3) |
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0.4VCC |
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0.6VCC |
V |
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Input Low Voltage |
VIL2 |
SRL |
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0.8 |
V |
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SRL Input Current |
IIN3 |
SRL = VCC |
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75 |
µA |
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SRL = GND (Note 3) |
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-75 |
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Input Current (A and B) |
IIN4 |
DE = GND, |
VIN = 12V |
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125 |
µA |
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Full Duplex |
VCC = GND or 5.25V |
VIN = -7V |
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-75 |
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Output Leakage (Y and Z) |
IO |
DE = GND, |
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VIN = 12V |
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125 |
µA |
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Full Duplex |
VCC = GND or 5.25V |
VIN = -7V |
-100 |
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Driver Short-Circuit Output |
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-7V ≤ |
VOUT ≤ VCC |
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-250 |
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VOD1 |
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0V ≤ |
VOUT ≤ 12V |
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250 |
mA |
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Current (Note 4) |
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0V ≤ VOUT ≤ VCC |
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±25 |
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2 _______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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RECEIVER |
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Receiver Differential Threshold |
VTH |
-7V ≤ VCM ≤ 12V |
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-200 |
-125 |
-50 |
mV |
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Voltage |
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Receiver Input Hysteresis |
VTH |
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25 |
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mV |
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Receiver Output High Voltage |
VOH |
IO = -4mA, VID = -50mV |
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VCC -1.5 |
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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 Output Current at |
IOZR |
0.4V ≤ VO ≤ 2.4V |
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±1 |
µA |
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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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Receiver Output Short-Circuit |
IOSR |
0V ≤ VRO ≤ VCC |
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±95 |
mA |
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Current |
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SUPPLY CURRENT |
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No load, |
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DE = VCC |
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430 |
900 |
µA |
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RE = DI = GND |
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DE = GND |
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375 |
600 |
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Supply Current |
ICC |
or VCC, SRL = VCC |
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No load, |
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DE = VCC |
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475 |
1000 |
µA |
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RE = DI = GND |
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DE = GND |
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420 |
800 |
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or VCC, SRL = GND |
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Supply Current in Shutdown |
ISHDN |
DE = GND, VRE = VCC |
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0.001 |
10 |
µA |
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Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device ground unless otherwise noted.
Note 2: VOD and VOC are the changes in VOD and VOC, respectively, when the DI input changes state.
Note 3: The SRL pin is internally biased to VCC / 2 by a 100kΩ /100kΩ resistor divider. It is guaranteed to be VCC / 2 if left unconnected.
Note 4: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during current limiting.
MAX3089–MAX3080
_______________________________________________________________________________________ 3
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX3080–MAX3082, and MAX3089 with SRL = Unconnected
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER |
SYMBOL |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Driver Input to Output |
tDPLH |
Figures 7 and 9, RDIFF = 54Ω , |
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500 |
2030 |
2600 |
ns |
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tDPHL |
CL1 = CL2 = 100pF |
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500 |
2030 |
2600 |
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Driver Output Skew |
tDSKEW |
Figures 7 and 9, RDIFF = 54Ω , |
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±200 |
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| tDPLH - tDPHL | |
CL1 = CL2 = 100pF |
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Figures 7 and 9, RDIFF = 54Ω , |
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Driver Rise or Fall Time |
tDR, tDF |
667 |
1320 |
2500 |
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CL1 = CL2 = 100pF |
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Maximum Data Rate |
fMAX |
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115 |
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kbps |
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Driver Enable to Output High |
tDZH |
Figures 8 and 10, CL = 100pF, S2 closed |
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3500 |
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Driver Enable to Output Low |
tDZL |
Figures 8 and 10, CL = 100pF, S1 closed |
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3500 |
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Driver Disable Time from Low |
tDLZ |
Figures 8 and 10, CL = 15pF, S1 closed |
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100 |
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Driver Disable Time from High |
tDHZ |
Figures 8 and 10, CL = 15pF, S2 closed |
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100 |
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Receiver Input to Output |
tRPLH, |
Figures 11 and 13; | VID | ≥ 2.0V; |
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127 |
200 |
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tRPHL |
rise and fall time of VID ≤ 15ns |
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| tRPLH - tRPHL | Differential |
tRSKD |
Figures 11 and 13; | VID | ≥ 2.0V; |
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3 |
±30 |
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Receiver Skew |
rise and fall time of VID ≤ 15ns |
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Receiver Enable to Output Low |
tRZL |
Figures 6 and 12, CL = 100pF, S1 closed |
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50 |
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Receiver Enable to Output High |
tRZH |
Figures 6 and 12, CL = 100pF, S2 closed |
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50 |
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Receiver Disable Time from Low |
tRLZ |
Figures 6 and 12, CL = 100pF, S1 closed |
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50 |
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Receiver Disable Time from |
tRHZ |
Figures 6 and 12, CL = 100pF, S2 closed |
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20 |
50 |
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High |
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Time to Shutdown |
tSHDN |
(Note 5) |
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50 |
200 |
600 |
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Driver Enable from Shutdown to |
tDZH(SHDN) |
Figures 8 and 10, CL = 15pF, S2 closed |
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6000 |
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Output High |
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Driver Enable from Shutdown to |
tDZL(SHDN) |
Figures 8 and 10, CL = 15pF, S1 closed |
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6000 |
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Output Low |
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Receiver Enable from Shutdown |
tRZH(SHDN) |
Figures 6 and 12, CL = 100pF, S2 closed |
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3500 |
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to Output High |
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Receiver Enable from Shutdown |
tRZL(SHDN) |
Figures 6 and 12, CL = 100pF, S1 closed |
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3500 |
ns |
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to Output Low |
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4 _______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX3083–MAX3085, and MAX3089 with SRL = VCC
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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Driver Input to Output |
tDPLH |
Figures 7 and 9, RDIFF = 54Ω , |
250 |
720 |
1000 |
ns |
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|
tDPHL |
CL1 = CL2 = 100pF |
250 |
720 |
1000 |
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Driver Output Skew |
tDSKEW |
Figures 7 and 9, RDIFF = 54Ω , |
|
-3 |
±100 |
ns |
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| tDPLH - tDPHL | |
CL1 = CL2 = 100pF |
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Driver Rise or Fall Time |
tDR, tDF |
Figures 7 and 9, RDIFF = 54Ω , |
200 |
530 |
750 |
ns |
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CL1 = CL2 = 100pF |
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Maximum Data Rate |
fMAX |
|
500 |
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kbps |
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Driver Enable to Output High |
tDZH |
Figures 8 and 10, CL = 100pF, S2 closed |
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|
2500 |
ns |
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Driver Enable to Output Low |
tDZL |
Figures 8 and 10, CL = 100pF, S1 closed |
|
|
2500 |
ns |
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Driver Disable Time from Low |
tDLZ |
Figures 8 and 10, CL = 15pF, S1 closed |
|
|
100 |
ns |
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Driver Disable Time from High |
tDHZ |
Figures 8 and 10, CL = 15pF, S2 closed |
|
|
100 |
ns |
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Receiver Input to Output |
tRPLH, |
Figures 11 and 13; | VID | ≥ 2.0V; |
|
127 |
200 |
ns |
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tRPHL |
rise and fall time of VID ≤ 15ns |
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| tRPLH - tRPHL | Differential |
tRSKD |
Figures 11 and 13; | VID | ≥ 2.0V; |
|
3 |
±30 |
ns |
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|
Receiver Skew |
rise and fall time of VID ≤ 15ns |
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Receiver Enable to Output Low |
tRZL |
Figures 6 and 12, CL = 100pF, S1 closed |
|
20 |
50 |
ns |
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Receiver Enable to Output High |
tRZH |
Figures 6 and 12, CL = 100pF, S2 closed |
|
20 |
50 |
ns |
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Receiver Disable Time from Low |
tRLZ |
Figures 6 and 12, CL = 100pF, S1 closed |
|
20 |
50 |
ns |
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Receiver Disable Time from |
tRHZ |
Figures 6 and 12, CL = 100pF, S2 closed |
|
20 |
50 |
ns |
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High |
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Time to Shutdown |
tSHDN |
(Note 5) |
50 |
200 |
600 |
ns |
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Driver Enable from Shutdown to |
tDZH(SHDN) |
Figures 8 and 10, CL = 15pF, S2 closed |
|
|
4500 |
ns |
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Output High |
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Driver Enable from Shutdown to |
tDZL(SHDN) |
Figures 8 and 10, CL = 15pF, S1 closed |
|
|
4500 |
ns |
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Output Low |
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Receiver Enable from Shutdown |
tRZH(SHDN) |
Figures 6 and 12, CL = 100pF, S2 closed |
|
|
3500 |
ns |
||
to Output High |
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Receiver Enable from Shutdown |
tRZL(SHDN) |
Figures 6 and 12, CL = 100pF, S1 closed |
|
|
3500 |
ns |
|
|
to Output Low |
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MAX3089–MAX3080
_______________________________________________________________________________________ 5
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX3086–MAX3088, and MAX3089 with SRL = GND
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
|
|
|
|
|
|
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|
|
Driver Input to Output |
tDPLH |
Figures 7 and 9, RDIFF = 54Ω , |
|
34 |
60 |
ns |
|
tDPHL |
CL1 = CL2 = 100pF |
|
34 |
60 |
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||
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Driver Output Skew |
tDSKEW |
Figures 7 and 9, RDIFF = 54Ω , |
|
-2.5 |
±10 |
ns |
|
| tDPLH - tDPHL | |
CL1 = CL2 = 100pF |
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Driver Rise or Fall Time |
tDR, tDF |
Figures 7 and 9, RDIFF = 54Ω , |
|
14 |
25 |
ns |
|
CL1 = CL2 = 100pF |
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|
Maximum Data Rate |
fMAX |
|
10 |
|
|
Mbps |
|
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Driver Enable to Output High |
tDZH |
Figures 8 and 10, CL = 100pF, S2 closed |
|
|
150 |
ns |
|
Driver Enable to Output Low |
tDZL |
Figures 8 and 10, CL = 100pF, S1 closed |
|
|
150 |
ns |
|
Driver Disable Time from Low |
tDLZ |
Figures 8 and 10, CL = 15pF, S1 closed |
|
|
100 |
ns |
|
Driver Disable Time from High |
tDHZ |
Figures 8 and 10, CL = 15pF, S2 closed |
|
|
100 |
ns |
|
Receiver Input to Output |
tRPLH, |
Figures 11 and 13; | VID | ≥ 2.0V; |
|
106 |
150 |
ns |
|
tRPHL |
rise and fall time of VID ≤ 15ns |
|
|
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|
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|
||
| tRPLH - tRPHL | Differential |
tRSKD |
Figures 11 and 13; | VID | ≥ 2.0V; |
|
0 |
±10 |
ns |
|
Receiver Skew |
rise and fall time of VID ≤ 15ns |
|
|
||||
|
|
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||
Receiver Enable to Output Low |
tRZL |
Figures 6 and 12, CL = 100pF, S1 closed |
|
20 |
50 |
ns |
|
Receiver Enable to Output High |
tRZH |
Figures 6 and 12, CL = 100pF, S2 closed |
|
20 |
50 |
ns |
|
Receiver Disable Time from Low |
tRLZ |
Figures 6 and 12, CL = 100pF, S1 closed |
|
20 |
50 |
ns |
|
Receiver Disable Time from |
tRHZ |
Figures 6 and 12, CL = 100pF, S2 closed |
|
20 |
50 |
ns |
|
High |
|
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|
|
|
Time to Shutdown |
tSHDN |
(Note 5) |
50 |
200 |
600 |
ns |
|
|
|
|
|
|
|
|
|
Driver Enable from Shutdown to |
tDZH(SHDN) |
Figures 8 and 10, CL = 15pF, S2 closed |
|
|
250 |
ns |
|
Output High |
|
|
|
||||
|
|
|
|
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|
|
|
|
|
|
|
|
Driver Enable from Shutdown to |
tDZL(SHDN) |
Figures 8 and 10, CL = 15pF, S1 closed |
|
|
250 |
ns |
|
Output Low |
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Receiver Enable from Shutdown |
tRZH(SHDN) |
Figures 6 and 12, CL = 100pF, S2 closed |
|
|
3500 |
ns |
|
to Output High |
|
|
|
||||
|
|
|
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|
|
|
|
|
|
Receiver Enable from Shutdown |
tRZL(SHDN) |
Figures 6 and 12, CL = 100pF, S1 closed |
|
|
3500 |
ns |
|
to Output Low |
|
|
|||||
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|
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Note 5: The device is put into shutdown by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the device is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the device is guaranteed to have entered shutdown.
6 _______________________________________________________________________________________