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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 reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission up to 115kbps. The
MAX3083/MAX3084/MAX3085 offer higher driver out-
put 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 imped-
ance that allows up to 256 transceivers on the bus. The
MAX3082/MAX3085/MAX3088 are intended for half-
duplex communications, while the MAX3080/MAX3081/
MAX3083/MAX3084/MAX3086/MAX3087 are intended
for full-duplex communications. The MAX3089 is selec-
table between half-duplex and full-duplex operation. It
also features independently programmable receiver
and transmitter output phase via separate pins.
Next Generation Device Features
♦ For Fault-Tolerant Applications:
MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4-
Unit Load, +3.3V RS-485 Transceiver
♦ For Low-Voltage Applications:
MAX3362: +3.3V, High-Speed, RS-485/RS-422
Transceiver in a SOT23 Package
♦ For Multiple Transceiver Applications:
MAX3030E–MAX3033E: ±15kV ESD-Protected,
+3.3V, Quad, RS-422 Transmitters
MAX3040–MAX3045: ±10kV ESD-Protected, Quad,
+5V, RS-485/RS-422 Transmitters
Applications
RS-422/RS-485 Communications
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
________________________________________________________________ Maxim Integrated Products 1
19-1138; Rev 2; 10/03
Selection Table
*Pin-compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13.
Ordering Information continued at end of data sheet.
Ordering Information
PART
MAX3080CSD
MAX3080CPD
MAX3080ESD -40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP RANGE PIN-PACKAGE
14 SO
14 Plastic DIP
14 SO
MAX3080EPD -40°C to +85°C 14 Plastic DIP
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Part
Half/Full
Duplex
Data
Rate
(Mbps)
Slew
Rate
Limited
Low-
Power
Shutdown
Receiver/
Driver
Enable
Quiescent
Current
(µA)
Transceivers
On
Bus
Pin
Count
Industry-
Standard
Pinout
MAX3080
Full 0.115 Yes Yes Yes 375 256 14 75180
MAX3081
Full 0.115 Yes No No 375 256 8 75179
MAX3082
Half 0.115 Yes Yes Yes 375 256 8 75176
MAX3083
Full 0.5 Yes Yes Yes 375 256 14 75180
MAX3084
Full 0.5 Yes No No 375 256 8 75179
MAX3085
Half 0.5 Yes Yes Yes 375 256 8 75176
MAX3086
Full 1.0 No Yes Yes 375 256 14 75180
MAX3087
Full 1.0 No No No 375 256 8 75179
MAX3088
Half 1.0 No Yes Yes 375 256 8 75176
MAX3089
Selectable Selectable Selectable
Yes Yes 375 256 14 75180*
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