Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
General Description
The HWD481, HWD483, HWD485, HWD487鈥揌WD491, and
HWD1487 are low-power transceivers for RS-485 and RS-
422 communication. Each part contains one driver and one
receiver. The HWD483, HWD487, HWD488, and HWD489
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 HWD481, HWD485, HWD490,
HWD491, and HWD1487 are not limited, allowing them to
transmit up to 2.5Mbps.
These transceivers draw between 120碌A and 500碌A of
supply current when unloaded or fully loaded with disabled
drivers. Additionally, the HWD481, HWD483, and HWD487
have a low-current shutdown mode in which they consume
only 0.1碌A. 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 HWD487 and HWD1487 feature quarter-unit-load
receiver input impedance, allowing up to 128 HWD487/
HWD1487 transceivers on the bus. Full-duplex communi-
cations are obtained using the HWD488鈥揌WD491, while
the HWD481, HWD483, HWD485, HWD487, and HWD1487
are designed for half-duplex applications.
__Next Generation Device Features
鈾?/div>
For Fault-Tolerant Applications
HWD3430:
鹵80V Fault-Protected, Fail-Safe, 1/4
Unit Load, +3.3V, RS-485 Transceiver
HWD3440E鈥揌WD3444E:
鹵15kV ESD-Protected,
鹵60V Fault-Protected, 10Mbps, Fail-Safe,
RS-485/J1708 Transceivers
鈾?/div>
For Space-Constrained Applications
HWD3460鈥揌WD3464:
+5V, Fail-Safe, 20Mbps,
Profibus RS-485/RS-422 Transceivers
HWD3362:
+3.3V, High-Speed, RS-485/RS-422
Transceiver in a SOT23 Package
HWD3280E鈥揌WD3284E:
鹵15kV ESD-Protected,
52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,
True Fail-Safe Receivers
HWD3293/HWD3294/HWD3295:
20Mbps, +3.3V,
SOT23, RS-855/RS-422 Transmitters
鈾?/div>
For Multiple Transceiver Applications
HWD3030E鈥揌WD3033E:
鹵15kV ESD-Protected,
+3.3V, Quad RS-422 Transmitters
鈾?/div>
For Fail-Safe Applications
HWD3080鈥揌WD3089:
Fail-Safe, High-Speed
(10Mbps), Slew-Rate-Limited RS-485/RS-422
Transceivers
鈾?/div>
For Low-Voltage Applications
HWD3483E/HWD3485E/HWD3486E/HWD3488E/
HWD3490E/HWD3491E:
+3.3V Powered, 鹵15kV
ESD-Protected, 12Mbps, Slew-Rate-Limited,
True RS-485/RS-422 Transceivers
Ordering Information appears at end of data sheet.
________________________Applications
Low-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
______________________________________________________________Selection Table
PART
NUMBER
HWD481
HWD483
HWD485
HWD487
HWD488
HWD489
HWD490
HWD491
HWD1487
HALF/FULL
DUPLEX
Half
Half
Half
Half
Full
Full
Full
Full
Half
DATA RATE
(Mbps)
2.5
0.25
2.5
0.25
0.25
0.25
2.5
2.5
2.5
SLEW-RATE
LIMITED
No
Yes
No
Yes
Yes
Yes
No
No
No
LOW-POWER
SHUTDOWN
Yes
Yes
No
Yes
No
No
No
No
No
RECEIVER/
DRIVER
ENABLE
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
QUIESCENT
CURRENT
(碌A)
300
120
300
120
120
120
300
300
230
NUMBER OF
TRANSMITTERS
ON BUS
32
32
32
128
32
32
32
32
128
PIN
COUNT
8
8
8
8
8
14
8
14
8
1
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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英文版
Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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