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MAX481C

更新时间： 2024-11-03 22:12:43
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美信 - MAXIM /
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19页 439K
描述
Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

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MAX481C 数据手册

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19-0122; Rev 8; 10/03  
Low-Power, Slew-Rate-Limited  
RS-485/RS-422 Transceivers  
General Description  
__Next Generation Device Features  
♦ 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: ±80V Fault-Protected, Fail-Safe, 1/4  
Unit Load, +3.3V, RS-485 Transceiver  
MAX3440E–MAX3444E: ±15kV ESD-Protected,  
±60V Fault-Protected, 10Mbps, Fail-Safe,  
RS-485/J1708 Transceivers  
♦ For Space-Constrained Applications  
MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,  
Profibus RS-485/RS-422 Transceivers  
MAX3362: +3.3V, High-Speed, RS-485/RS-422  
Transceiver in a SOT23 Package  
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.  
MAX3280E–MAX3284E: ±15kV ESD-Protected,  
52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,  
True Fail-Safe Receivers  
MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,  
SOT23, RS-855/RS-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.  
♦ For Multiple Transceiver Applications  
MAX3030E–MAX3033E: ±15kV ESD-Protected,  
+3.3V, Quad RS-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.  
♦ For Fail-Safe Applications  
MAX3080–MAX3089: Fail-Safe, High-Speed  
(10Mbps), Slew-Rate-Limited RS-485/RS-422  
Transceivers  
________________________Applications  
♦ For Low-Voltage Applications  
MAX3483E/MAX3485E/MAX3486E/MAX3488E/  
MAX3490E/MAX3491E: +3.3V Powered, ±15kV  
ESD-Protected, 12Mbps, Slew-Rate-Limited,  
True RS-485/RS-422 Transceivers  
Low-Power RS-485 Transceivers  
Low-Power RS-422 Transceivers  
Level Translators  
Transceivers for EMI-Sensitive Applications  
Industrial-Control Local Area Networks  
Ordering Information appears at end of data sheet.  
______________________________________________________________Selection Table  
RECEIVER/  
DRIVER  
ENABLE  
QUIESCENT  
CURRENT  
(µA)  
NUMBER OF  
TRANSMITTERS  
ON BUS  
PART  
NUMBER  
HALF/FULL DATA RATE SLEW-RATE LOW-POWER  
PIN  
COUNT  
DUPLEX  
(Mbps)  
LIMITED  
SHUTDOWN  
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  
________________________________________________________________ Maxim Integrated Products  
1
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.  
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