MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
General Description
__Next Generation Device Features
o For Fault-Tolerant Applications
The MAX481, MAX483, MAX485, MAX487–MAX491, and
MAX1487 are low-power transceivers for RS-485 and RS-
422 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.
MAX3430: ±±0ꢀ Fault-ꢁrotecteꢂd Fail-ꢃaꢄed ꢅ14
Unit Loaꢂd +3.3ꢀd Rꢃ-4±5 Transceiver
MAX3440E–MAX3444E: ±ꢅ5ꢆꢀ EꢃS-ꢁrotecteꢂd
±ꢇ0ꢀ Fault-ꢁrotecteꢂd ꢅ0Mꢈpsd Fail-ꢃaꢄed
Rꢃ-4±51Jꢅ70± Transceivers
o For ꢃpace-Constraineꢂ Applications
MAX34ꢇ0–MAX34ꢇ4: +5ꢀd Fail-ꢃaꢄed 20Mꢈpsd
ꢁroꢄiꢈus Rꢃ-4±51Rꢃ-422 Transceivers
MAX33ꢇ2: +3.3ꢀd High-ꢃpeeꢂd Rꢃ-4±51Rꢃ-422
Transceiver in a ꢃOT23 ꢁacꢆage
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.
MAX32±0E–MAX32±4E: ±ꢅ5ꢆꢀ EꢃS-ꢁrotecteꢂd
52Mꢈpsd +3ꢀ to +5.5ꢀd ꢃOT23d Rꢃ-4±51Rꢃ-422d
True Fail-ꢃaꢄe Receivers
MAX32931MAX32941MAX3295: 20Mꢈpsd +3.3ꢀd
ꢃOT23d Rꢃ-4±51Rꢃ-422 Transmitters
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.
o For Multiple Transceiver Applications
MAX3030E–MAX3033E: ±ꢅ5ꢆꢀ EꢃS-ꢁrotecteꢂd
+3.3ꢀd Quaꢂ Rꢃ-422 Transmitters
The MAX487 and MAX1487 feature quarter-unit-load
receiver input impedance, allowing up to 128 MAX487/
MAX1487 transceivers on the bus. Full-duplex communi-
cations are obtained using the MAX488–MAX491, while
the MAX481, MAX483, MAX485, MAX487, and MAX1487
are designed for half-duplex applications.
o For Fail-ꢃaꢄe Applications
MAX30±0–MAX30±9: Fail-ꢃaꢄed High-ꢃpeeꢂ
(ꢅ0Mꢈps)d ꢃlew-Rate-Limiteꢂ Rꢃ-4±51Rꢃ-422
Transceivers
________________________Applications
o For Low-ꢀoltage Applications
MAX34±3E1MAX34±5E1MAX34±ꢇE1MAX34±±E1
MAX3490E1MAX349ꢅE: +3.3ꢀ ꢁowereꢂd ±ꢅ5ꢆꢀ
EꢃS-ꢁrotecteꢂd ꢅ2Mꢈpsd ꢃlew-Rate-Limiteꢂd
True Rꢃ-4±51Rꢃ-422 Transceivers
Low-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Orꢂering Inꢄormation appears at enꢂ oꢄ ꢂata sheet.
______________________________________________________________Selection Table
DATA
RATE
(Mbps)
LOW-
POWER
SHUTDOWN
RECEIVER/ QUIESCENT
NUMBER OF
RECEIVERS ON
BUS
PART
NUMBER
HALF/FULL
DUPLEX
SLEW-RATE
LIMITED
PIN
COUNT
DRIVER
ENABLE
CURRENT
(μA)
MAX481
MAX483
MAX485
MAX487
MAX488
MAX489
MAX490
MAX491
MAX1487
Half
Half
Half
Half
Full
Full
Full
Full
Half
2.5
0.25
2.5
No
Yes
No
Yes
Yes
No
Yes
Yes
Yes
Yes
No
300
120
300
120
120
120
300
300
230
32
32
8
8
32
8
0.25
0.25
0.25
2.5
Yes
Yes
Yes
No
Yes
No
128
32
8
8
No
Yes
No
32
14
8
No
32
2.5
No
No
Yes
Yes
32
14
8
2.5
No
No
128
For pricingd ꢂeliveryd anꢂ orꢂering inꢄormationd please contact Maxim Sirect at
ꢅ-±±±-ꢇ29-4ꢇ42d or visit Maxim Integrateꢂ’s weꢈsite at www.maximintegrateꢂ.com.
19-0122; Rev 10; 9/14