參數(shù)資料
型號(hào)： MAX1490B
廠商： Maxim Integrated Products, Inc.
英文描述： Complete, Isolated RS-485/RS-422 Data Interface(2.5Mbps，全雙工，完全隔離的RS-485/422收發(fā)器)
中文描述： 完備的隔離型、RS-485/RS-422數(shù)據(jù)接口
文件頁數(shù)： 1/20頁
文件大?。?/td> 315K
代理商： MAX1490B
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Desc ription
The MAX1480A/MAX1480B/MAX1490A/MAX1490B are
complete, electrically isolated, RS-485/RS-422 data-
communications interface solutions. Transceivers, opto-
couplers, and a transformer provide a complete
interface in a standard DIP package. A single +5V sup-
ply on the logic side powers both sides of the interface.
The MAX1480B/MAX1490B feature reduced-slew-rate
drivers that minimize EMI and reduce reflections
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 are designed for half-duplex commu-
nication, while the MAX1490A/B feature full-duplex
communication.
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, RO high for the MAX1490A/B) if the input
is open circuit.
The MAX1480A/MAX1480B/MAX1490A/MAX1490B typ-
ically withstand 1600V
RMS
(1 minute) or 2000V
RMS
(1
second). Their isolated outputs meet all RS-485/RS-422
specifications. The MAX1480A/B are available in a 28-
pin DIP package, and the MAX1490A/B are available in
a 24-pin DIP package.
________________________Applic ations
Isolated RS-485/RS-422 Data Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Automatic Test Equipment
HVAC/Building Control Networks
____________________________Features
o
Isolated Data Interface, Typically to 1600V
RMS
(1 minute)
o
Slew-Rate Limited for Errorless Data
Transmission (MAX1480B/MAX1490B)
o
High-Speed, Isolated, 2.5Mbps RS-485/RS-422
Interface (MAX1480A/MAX1490A)
o
Full-Duplex Data Communication (MAX1490A/B)
o
-7V to +12V Common-Mode Input Voltage Range
with Respect to Isolated Ground
o
Single +5V Supply
o
Current Limiting and Thermal Shutdown for
Driver Overload Protection
o
Standard 0.6" DIP Package:
28-Pin DIP (MAX1480A/B)
24-Pin DIP (MAX1490A/B)
M
Complete, Isolated,
RS -485/RS -422 Data Interfac e
________________________________________________________________ Maxim Integrated Products
1
1
24
23
22
21
20
19
18
17
2
3
4
5
6
7
8
AC1
AC2
ISOV
CC1
ISORODRV
D2
D1
A
B
Z
Y
SD
FS
GND1
16
15
14
13
9
10
11
12
ISOCOM1
ISODI DRV
ISOV
CC2
ISOROLED
GND2
RO
DI
DIP
V
CC2
V
CC3
V
CC4
V
CC1
MAX1490A/B
M
M
M
TOP VIEW
ISOLATION BARRIER
_________________Pin Configurations
19-0259; Rev 1; 1/96
PART
MAX1480A
CPI
MAX1480AEPI
Ordering Information continued at end of data sheet.
Data rate for “A” parts is up to 2500kbps. Data rate for “B” parts
is up to 250kbps.
-40°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
28 Wide Plastic DIP
28 Wide Plastic DIP
______________Ordering Information
PART
MAX1480A
MAX1480B
MAX1490A
MAX1490B
HALF/FULL
DUPLEX
Half
Half
Full
Full
____________________S elec tion Table
DATA
RATE
(Mbps)
2.5
0.25
2.5
0.25
SLEW-
RATE
LIMITED
No
Yes
No
Yes
DRIVER
ENABLE
Yes
Yes
No
No
Pin Configurations continued at end of data sheet.
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