MAX1480 Maxim, MAX1480 Datasheet
MAX1480
Manufacturer Part Number
MAX1480
Description
Complete / Isolated RS-485/RS-422 Data Interface
Manufacturer
Maxim
Datasheet
1.MAX1480.pdf
(20 pages)
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_________________General Description
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.
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.
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.
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B typically withstand 1600V
2000V
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.
_____________________Selection Table
________________________Applications
19-0259; Rev 2a; 2/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX1480A
MAX1480B
MAX1480C
MAX1490A
MAX1490B
PART
Isolated RS-485/RS-422 Data Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Automatic Test Equipment
HVAC/Building Control Networks
RMS
(1 second). Their isolated outputs meet all
DUPLEX
HALF/
FULL
________________________________________________________________ Maxim Integrated Products
Half
Half
Half
Full
Full
(Mbps)
DATA
RATE
0.25
0.25
0.25
2.5
2.5
Complete, Isolated RS-485/RS-422
LIMITED
SLEW-
RATE
RMS
Yes
Yes
Yes
No
No
(1 minute) or
ENABLE
DRIVER
TIME
(µs)
0.2
0.5
35
—
—
_______________Ordering Information
Ordering Information continued at end of data sheet.
†
“C” parts is up to 250kbps.
__________________Pin Configurations
____________________________Features
MAX1480ACPI
MAX1480AEPI
Data rate for “A” parts is up to 2.5Mbps. Data rate for “B” and
Isolated Data Interface, Typically to 1600V
(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)
-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:
Pin Configurations continued at end of data sheet.
TOP VIEW
28-Pin DIP (MAX1480A/B/C)
24-Pin DIP (MAX1490A/B)
PART
†
GND1
GND2
V
V
V
V
CC1
CC2
CC3
CC4
SD
RO
D1
D2
FS
DI
10
11
12
6
1
2
3
4
5
7
8
9
TEMP. RANGE
-40°C to +85°C
ISOLATION BARRIER
0°C to +70°C
Data Interface
DIP
24
22
21
20
18
17
16
14
13
23
19
15
AC1
AC2
ISO V
ISO RO DRV
A
B
ISO COM1
ISO DI DRV
Y
ISO RO LED
Z
ISO V
28 Wide Plastic DIP
28 Wide Plastic DIP
PIN-PACKAGE
CC1
CC2
MAX1490A/B
RMS
1
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