19-1800; Rev 1; 5/06
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
General Description
Features
The MAX3080E–MAX3089E are 15ꢀk electrostatic dis-
charge (ESD)-protected, high-speed transceivers for RS-
485/RS-422 communication that 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
MAX3080E/MAX3081E/MAX3082E feature reduced
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission up to 115ꢀbps. The
MAX3083E/MAX3084E/MAX3085E offer higher driver
output slew-rate limits, allowing transmit speeds up to
500ꢀbps. The MAX3086E/MAX3087E/ MAX3088Es’ dri-
ver slew rates are not limited, maꢀing transmit speeds
up to 10Mbps possible. The MAX3089E’s slew rate is
selectable between 115ꢀbps, 500ꢀbps, and 10Mbps by
driving a selector pin with a single three-state driver. All
devices feature enhanced ESD protection. All transmitter
outputs and receiver inputs are protected to 15ꢀk
using the Human Body Model.
♦ ESD Protection for RS-485 I/O Pins
15kV, Human Body Model
♦ True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
♦ Enhanced Slew-Rate Limiting Facilitates
Error-Free Data Transmission
(MAX3080E–MAX3085E/MAX3089E)
♦ 1nA Low-Current Shutdown Mode (Except
MAX3081E/MAX3084E/MAX3087E)
♦ Pin-Selectable Full/Half-Duplex Operation
(MAX3089E)
♦ Phase Controls to Correct for Twisted-Pair
Reversal (MAX3089E)
♦ 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 Networꢀs
These transceivers typically draw 375µA of supply
current when unloaded, or when fully loaded with the dri-
vers disabled.
All devices have a 1/8-unit-load receiver input impedance
that allows up to 256 transceivers on the bus. The
MAX3082E/MAX3085E/MAX3088E are intended for half-
duplex communications, while the MAX3080E/MAX3081E/
MAX3083E/MAX3084E/MAX3086E/MAX3087E are
intended for full-duplex communications. The MAX3089E
is selectable between half-duplex and full-duplex opera-
tion. It also features independently programmable
receiver and transmitter output phase via separate pins.
Ordering Information
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 SO
MAX3080ECSD
MAX3080ECPD
MAX3080EESD
MAX3080EEPD
14 Plastic DIP
14 SO
14 Plastic DIP
Ordering Information continued at end of data sheet.
Selector Guide
Data
Rate
(Mbps)
Slew-
Rate
Limited
Low-
Power
Shutdown
Receiver/ Quiescent Transceivers
Industry-
Standard
Pinout
Half/Full
Duplex
Pin
Count
Part
Driver
Current
(µA)
On
Enable
Bus
MAX3080E
MAX3081E
MAX3082E
MAX3083E
MAX3084E
MAX3085E
MAX3086E
MAX3087E
MAX3088E
Full
Full
Half
Full
Full
Half
Full
Full
Half
0.115
0.115
0.115
0.5
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
375
375
375
375
375
375
375
375
375
375
256
256
256
256
256
256
256
256
256
256
14
8
75180
75179
75176
75180
75179
75176
75180
75179
75176
75180*
Yes
Yes
No
Yes
Yes
No
8
14
8
0.5
0.5
Yes
Yes
No
Yes
Yes
No
8
10
14
8
10
No
10
No
Yes
Yes
Yes
Yes
8
MAX3089E Selectable Selectable Selectable
14
*Pin compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13.
________________________________________________________________ Maxim Integrated Products
1
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