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.