19-2756; Rev 1; 4/03
±±0ꢀ Faultꢁ-rotected, FailꢁSafe,
1/4ꢁUnit Load, +3.3ꢀ RSꢁ4±5 Transceiver
General Description
Features
The MAX3430 fault-protected RS-485 transceiver features
80V protection from overvoltage signal faults on commu-
nication bus lines. Each device contains one driver and
one receiver, and the output pins can withstand faults,
with respect to ground, of up to 80V. Even if the faults
occur when the transceiver is active, shut down, or pow-
ered off, the device will not be damaged. The MAX3430
operates from a 3.3V supply and features a slew-rate-lim-
ited driver that minimizes EMI and reduces reflections
caused by improperly terminated cables, allowing error-
free data transmission at data rates up to 250kbps. The
MAX3430 has a 1/4-unit-load receiver input impedance
allowing up to 128 transceivers on a single bus and fea-
tures fail-safe circuitry, which guarantees a logic-high
receiver output when the receiver inputs are open.
ꢀ ±±80V FaulVꢀPrltelꢁro
ꢀ ±ꢂ120VꢃESVꢀPrltelꢁro
ꢀ +3.30VOptPFlꢁro
ꢀ IoltPoFuVEutw-RFltVLꢁmꢁlꢁog
ꢀ 1582bpsVSFlFVRFlt
ꢀ AuurwsVUpVlrVꢂ1±VTPFosetꢁvtPsVroVlhtVBas
ꢀ -70VlrV+ꢂ10VCrmmro-MrdtVIopalV0rulFgtVRFogt
ꢀ TPatV Fꢁu-EFftVIopals
ꢀ Hrl-EwFpVIopalVElPaelaPtVroVSꢃ
ꢀ AvFꢁuFbutVꢁoV±-ꢀꢁoVEOVFodVꢀSIꢀVꢀFe2Fgts
Hot-swap circuitry eliminates false transitions on the
data cable during circuit initialization or connection to a
live backplane. Short-circuit current limiting and ther-
mal-shutdown circuitry protect the driver against exces-
sive power dissipation.
Ordering Information
The MAX3430 is available in 8-pin SO and 8-pin PDIP
packages, and is specified over commercial and indus-
trial temperature ranges.
ꢀART
MAX3430CPA
MAX3430CSA
MAX3430EPA
MAX3430ESA
TꢃMꢀVRANGꢃ
0°C to +70°C
ꢀIN-ꢀACKAGꢃ
8 Plastic DIP
8 SO
0°C to +70°C
Applications
RS-422/RS-485 Communications
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
8 SO
Lighting Systems
Industrial-Control Local Area Networks
Profibus Applications
Multimaster RS-485 Networks
-in Configuration and Typical Operating Circuit
TOP VIEW
DE
V
CC
0.1µF
MAX3430
RO
RE
DE
DI
R
1
2
3
4
V
CC
8
7
6
5
1
8
R
RO
RE
DE
DI
D
DI
B
B
A
2
3
7
6
5
B
Rt
Rt
A
A
4
RO
R
D
D
GND
GND
RE
SIꢀ/EO
________________________________________________________________ Maxim Integrated Products
ꢂ
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.