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MAX1480A

更新时间： 2024-11-25 22:57:59
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美信 - MAXIM /
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21页 486K
描述
Complete, Isolated RS-485/RS-422 Data Interface

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MAX1480A 数据手册

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19-0259; Rev 4; 10/03  
Complete, Isolated RS-485/RS-422  
Data Interface  
_________________General Description  
Next-Generation Device Features  
♦ For Integrated ESD Protection  
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.  
MAX1480E/MAX1490E: ±15kV ESD-Protected,  
Isolated RS-485/RS-422 Data Interfaces  
♦ For Space-Constrained Applications  
MAX3157: High CMRR, RS-485 Transceiver with  
±50V Isolation  
_______________Ordering Information  
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.  
†
PART  
TEMP RANGE  
PIN-PACKAGE  
28 Wide Plastic DIP  
28 Wide Plastic DIP  
MAX1480ACPI  
MAX1480AEPI  
0°C to +70°C  
-40°C to +85°C  
Ordering Information continued at end of data sheet.  
Data rate for “A” parts is up to 2.5Mbps. Data rate for “B” and  
“C” parts is up to 250kbps.  
†
_____________________Selection Table  
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.  
DRIVER  
ENABLE  
TIME  
HALF/  
FULL  
DUPLEX  
DATA  
RATE  
(MBPS)  
SLEW-  
RATE  
LIMITED  
PART  
(µS)  
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  
—
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/  
MAX1490B typically withstand 1600V  
(1 minute) or  
RMS  
2000V  
(1 second). Their isolated outputs meet all  
RMS  
0.25  
Yes  
—
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  
________________________Applications  
TOP VIEW  
Isolated RS-485/RS-422 Data Interface  
Transceivers for EMI-Sensitive Applications  
Industrial-Control Local Area Networks  
Automatic Test Equipment  
V
V
CC1  
1
2
3
4
5
AC1  
24  
MAX1490A/B  
CC2  
23 AC2  
22 ISO V  
D1  
D2  
CC1  
ISO RO DRV  
21  
20  
19  
18  
17  
GND1  
FS  
A
B
Z
Y
HVAC/Building Control Networks  
6
SD  
7
8
V
CC3  
DI  
9
16 ISO COM1  
V
ISO DI DRV  
10  
11  
12  
15  
14  
CC4  
RO  
ISO V  
CC2  
GND2  
13 ISO RO LED  
ISOLATION BARRIER  
DIP  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ 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.  
1234567...21

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