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Image MAX485
型号: MAX485
厂商: Maxim Integrated Maxim Integrated
标准:
分类: 半导体
描述: 15kv esd-protected, slew-rate-limited, low-power, RS-485/RS-422 transceivers
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19-0410; Rev 3; 7/96  
±1 5 k V ES D-P ro t e c t e d , S le w -Ra t e -Lim it e d ,  
Lo w -P o w e r, RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs  
35–9/MAX1487E  
_______________Ge n e ra l De s c rip t io n  
____________________________Fe a t u re s  
? ESD Protection: ±15kV—Human Body Model  
The MAX481E, MAX483E, MAX485E, MAX487E–MAX491E,  
and MAX1487E are low-power transceivers for RS-485 and  
RS-422 communications in harsh environments. Each driver  
output and receiver input is protected against ±15kV electro-  
static discharge (ESD) shocks, without latchup. These parts  
c onta in one d rive r a nd one re c e ive r. The MAX483E,  
MAX487E, MAX488E, and MAX489E 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  
MAX481E, MAX485E, MAX490E, MAX491E, and MAX1487E  
are not limited, allowing them to transmit up to 2.5Mbps.  
? Slew-Rate Limited for Error-Free Data  
Transmission (MAX483E/487E/488E/489E)  
? Low Quiescent Current:  
120μA (MAX483E/487E/488E/489E)  
230μA (MAX1487E)  
300μA (MAX481E/485E/490E/491E)  
? -7V to +12V Common-Mode Input Voltage Range  
? Three-State Outputs  
? 30ns Propagation Delays, 5ns Skew  
(MAX481E/485E/490E/491E/1487E)  
These transceivers draw as little as 120μA supply current  
when unloaded or when fully loaded with disabled drivers  
(s e e Se le c tion Ta b le ). Ad d itiona lly, the MAX481E,  
MAX483E, and MAX487E have a low-current shutdown  
mode in which they consume only 0.5μA. All parts operate  
from a single +5V supply.  
? Full-Duplex and Half-Duplex Versions Available  
? Allows up to 128 Transceivers on the Bus  
(MAX487E/MAX1487E)  
Drivers are short-circuit current limited, and are protected  
against excessive power dissipation by thermal shutdown  
circuitry that places their outputs into a high-impedance  
state. The receiver input has a fail-safe feature that guaran-  
tees a logic-high output if the input is open circuit.  
? Current Limiting and Thermal Shutdown for  
Driver Overload Protection  
The MAX487E and MAX1487E feature quarter-unit-load  
receiver input impedance, allowing up to 128 transceivers  
on the bus. The MAX488E–MAX491E are designed for full-  
duplex communications, while the MAX481E, MAX483E,  
MAX485E, MAX487E, and MAX1487E are designed for half-  
duplex applications. For applications that are not ESD sen-  
sitive se e the p in- a nd func tion-c ompa tible MAX481,  
MAX483, MAX485, MAX487–MAX491, and MAX1487.  
______________Ord e rin g In fo rm a t io n  
PART  
TEMP. RANGE  
0°C to +70°C  
PIN-PACKAGE  
8 Plastic DIP  
8 SO  
MAX481ECPA  
MAX481ECSA  
MAX481EEPA  
MAX481EESA  
0°C to +70°C  
-40°C to +85°C  
-40°C to +85°C  
8 Plastic DIP  
8 SO  
________________________Ap p lic a t io n s  
Low-Power RS-485 Transceivers  
Ordering Information continued on last page.  
Low-Power RS-422 Transceivers  
Level Translators  
Transceivers for EMI-Sensitive Applications  
Industrial-Control Local Area Networks  
______________________________________________________________S e le c t io n Ta b le  
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  
MAX481E�  
MAX483E�  
MAX485E�  
MAX487E�  
MAX488E�  
MAX489E�  
MAX490E�  
MAX491E�  
MAX1487E  
Half�  
Half�  
Half�  
Half�  
Full�  
Full�  
Full�  
Full�  
Half  
2.5�  
0.25�  
2.5�  
No�  
Yes�  
No�  
Yes�  
Yes�  
Yes�  
No�  
No�  
No  
Yes�  
Yes�  
No�  
Yes�  
No�  
No�  
No�  
No�  
No  
Yes�  
Yes�  
Yes�  
Yes�  
No�  
300�  
120�  
300�  
120�  
120�  
120�  
300�  
300�  
230  
32�  
32�  
32�  
128�  
32�  
32�  
32�  
32�  
128  
8�  
8�  
8�  
0.25�  
0.25�  
0.25�  
2.5�  
8�  
8�  
Yes�  
No�  
14�  
8�  
2.5�  
Yes�  
Yes  
14�  
8
2.5  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800  
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