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MAX1490A

更新时间： 2024-09-27 23:45:43
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美信 - MAXIM /
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21页 1997K
描述
Complete.Isolated RS-485/RS-422 Data Interface

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MAX1490A 数据手册

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19-0259; Rev 3; 8/02  
Complete, Isolated RS-485/RS-422  
Data Interface  
_________________General Description  
____________________________Features  
ꢀ Isolated Data Interface, Typically to 1600V  
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/  
MAX1490B are complete, electrically isolated, RS-485/  
RS-422 data-communications interface solutions in a  
hybrid microcircuit. Transceivers, optocouplers, and a  
transformer provide a complete interface in a standard  
DIP package. A single +5V supply on the logic side pow-  
ers both sides of the interface.  
RMS  
(1 minute)  
ꢀ Slew-Rate Limited for Errorless Data  
Transmission (MAX1480B/MAX1480C/MAX1490B)  
ꢀ High-Speed, Isolated, 2.5Mbps RS-485/RS-422  
Interface (MAX1480A/MAX1490A)  
ꢀ Full-Duplex Data Communication (MAX1490A/B)  
The MAX1480B/MAX1480C/MAX1490B feature reduced-  
slew-rate drivers that minimize EMI and reduce reflec-  
tions caused by improperly terminated cables, allowing  
error-free data transmission at data rates up to 250kbps.  
The MAX1480A/MAX1490A driver slew rate is not limited,  
allowing transmission rates up to 2.5Mbps. The  
MAX1480A/B/C are designed for half-duplex communi-  
cation, while the MAX1490A/B feature full-duplex com-  
munication.  
ꢀ -7V to +12V Common-Mode Input Voltage Range  
with Respect to Isolated Ground  
ꢀ Single +5V Supply  
ꢀ Current Limiting and Thermal Shutdown for  
Driver Overload Protection  
ꢀ Standard 0.6" DIP Package:  
28-Pin DIP (MAX1480A/B/C)  
24-Pin DIP (MAX1490A/B)  
Drivers are short-circuit current limited and protected  
against excessive power dissipation by thermal shut-  
down circuitry that places the driver outputs into a high-  
impedance state. The receiver input has a fail-safe  
feature that guarantees a known output (RO low for the  
MAX1480A/B/C, RO high for the MAX1490A/B/C) if the  
input is open circuit.  
_______________Ordering Information  
†
PART  
TEMP RANGE  
0°C to +70°C  
-40°C to +85°C  
PIN-PACKAGE  
MAX1480ACPI  
MAX1480AEPI  
28 Wide Plastic DIP  
28 Wide Plastic DIP  
Ordering Information continued at end of data sheet.  
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/  
†
Data rate for “A” parts is up to 2.5Mbps. Data rate for “B” and  
MAX1490B typically withstand 1600V  
(1 minute) or  
RMS  
“C” parts is up to 250kbps.  
2000V  
(1 second). Their isolated outputs meet all  
RMS  
RS-485/RS-422 specifications. The MAX1480A/B/C are  
available in a 28-pin DIP package, and the MAX1490A/B  
are available in a 24-pin DIP package.  
Pin Configurations  
TOP VIEW  
V
V
CC1  
CC2  
1
2
3
4
5
AC1  
_____________________Selection Table  
24  
MAX1490A/B  
23 AC2  
DRIVER  
ENABLE  
TIME  
HALF/  
FULL  
DUPLEX  
DATA  
RATE  
(Mbps)  
SLEW-  
RATE  
LIMITED  
22  
21  
20  
19  
18  
17  
D1  
D2  
ISO V  
CC1  
PART  
ISO RO DRV  
(µs)  
GND1  
FS  
A
B
Z
Y
MAX1480A  
MAX1480B  
MAX1480C  
MAX1490A  
MAX1490B  
Half  
Half  
Half  
Full  
Full  
2.5  
0.25  
0.25  
2.5  
No  
Yes  
Yes  
No  
0.2  
35  
0.5  
—
6
SD  
7
8
V
V
CC3  
DI  
9
16 ISO COM1  
0.25  
Yes  
—
ISO DI DRV  
10  
11  
12  
15  
14  
CC4  
RO  
________________________Applications  
Isolated RS-485/RS-422 Data Interface  
Transceivers for EMI-Sensitive Applications  
Industrial-Control Local Area Networks  
Automatic Test Equipment  
ISO V  
CC2  
GND2  
13 ISO RO LED  
ISOLATION BARRIER  
DIP  
Pin Configurations continued at end of data sheet.  
HVAC/Building Control Networks  
________________________________________________________________ Maxim Integrated Products  
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.  
For small orders, phone 1-800-835-8769.  
1234567...21

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