19-1940; Rev 0; 4/01
1ꢀ5k EꢁDꢂ-rotected, Isolated Rꢁꢂ48ꢀ/Rꢁꢂ422
Data Interfaces
_________________General Description
____________________________Features
ꢀ Isolated Data Interface, Guaranteed to 1260V
The MAX1480EA/MAX1480EC/MAX1490EA/MAX1490EB
are complete, electrically isolated, RS-485/RS-422 data
communications interface solutions in a hybrid microcir-
cuit. The RS-485/RS-422 I/O pins are protected against
15ꢀk electrostatic discharge ꢁESꢂD shocꢀs, ꢃithout
latchup. Transceivers, optocouplers, and a transformer
provide a complete interface in a standard ꢂIP pacꢀage.
A single +5k supply on the logic side poꢃers both sides
of the interface.
RMS
(1min)
ꢀ
15kV ESD Protection on I/O Pins
ꢀ Slew-Rate Limited for Errorless Data
Transmission (MAX1480EC/MAX1490EB)
ꢀ High-Speed, Isolated, 2.5Mbps RS-485/RS-422
Interface (MAX1480EA/MAX1490EA)
ꢀ Full-Duplex Data Communication
(MAX1490EA/MAX1490EB)
The MAX1480EC/MAX1490EB feature reduced-sleꢃ-rate
drivers that minimize EMI and reduce reflections caused
by improperly terminated cables, alloꢃing error-free data
transmission at data rates up to 160ꢀbps. The
MAX1480EA/MAX1490EA driver sleꢃ rate is not limited,
alloꢃing transmission rates up to 2.5Mbps. The
MAX1480EA/MAX1480EC are designed for half-duplex
communication, ꢃhile the MAX1490EA/MAX1490EB fea-
ture full-duplex communication.
ꢀ Single +5V Supply
ꢀ Current Limiting and Thermal Shutdown for
Driver Overload Protection
ꢀ Standard 0.6in DIP Packages
28-Pin DIP (MAX1480EA/MAX1480EC)
24-Pin DIP (MAX1490EA/MAX1490EB)
_______________Ordering Information
ꢂrivers are short-circuit current limited and protected
against excessive poꢃer dissipation by thermal shut-
doꢃn circuitry that places the driver outputs into a high-
impedance state. The receiver input has a fail-safe
feature that guarantees a ꢀnoꢃn output ꢁRO loꢃ for the
MAX1480EA/MAX1480EC, RO high for the MAX1490EA/
MAX1490EBD if the input is open circuit.
†
PART
TEMP. RANGE
PIN-PACKAGE
MAX1480EACPI
MAX1480EAEPI
0°C to +70°C
28 Wide Plastic ꢂIP*
28 Wide Plastic ꢂIP*
-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 C parts is
up to 250kbps.
The MAX1480EA/MAX1480EC/MAX1490EA/MAX1490EB
*See Reliability section at end of data sheet.
ꢃithstand 1260k
ꢁ1minD or 1520k
ꢁ1sD. Their iso-
RMS
RMS
lated outputs meet all RS-485/RS-422 specifications. The
MAX1480EA/MAX1480EC are available in a 28-pin ꢂIP
pacꢀage, and the MAX1490EA/MAX1490EB are available
in a 24-pin ꢂIP pacꢀage.
-in Configurations
TOP VIEW
V
.
CC1
CC2
1
2
3
4
5
AC1
24
MAX1490EA/
MAX1490EB
V
23 AC2
________________________Applications
Isolated RS-485/RS-422 ꢂata Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Netꢃorꢀs
Automatic Test Equipment
22
21
20
19
18
17
D1
D2
ISO V
CC1
ISO RO DRV
GND1
FS
A
B
Z
Y
6
HkAC/Building Control Netꢃorꢀs
Telecom
SD
7
8
V
V
CC3
DI
9
16 ISO COM1
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.
Selector Guide appears 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.