Rainbow Electronics MAX3430 - Manual

General Description
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.
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.
The MAX3430 is available in 8-pin SO and 8-pin PDIP
packages, and is specified over commercial and indus-
trial temperature ranges.
Applications
RS-422/RS-485 Communications
Lighting Systems
Industrial-Control Local Area Networks
Profibus Applications
Multimaster RS-485 Networks
Features
♦ ±80V Fault Protection
♦ ±12kV ESD Protection
♦ +3.3V Operation
♦ Internal Slew-Rate Limiting
♦ 250kbps Data Rate
♦ Allows Up to 128 Transceivers on the Bus
♦ -7V to +12V Common-Mode Input Voltage Range
♦ True Fail-Safe Inputs
♦ Hot-Swap Input Structure on DE
♦ Available in 8-Pin SO and PDIP Packages
MAX3430
±80V Fault-Protected, Fail-Safe,
1/4-Unit Load, +3.3V RS-485 Transceiver
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration and Typical Operating Circuit
Ordering Information
1
2
3
4
8
5
V CC 0.1 µF
GND
DI
DE
RE
RO R
D
Rt Rt
7
6
D
R
DE
RE
DI
RO
A
B B
A
MAX3430
19-2756; Rev 0; 1/03
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.
PART TEMP RANGE PIN-PACKAGE
MAX3430CPD 0°C to +70°C 8 Plastic DIP
MAX3430CSD 0°C to +70°C 8 SO
MAX3430EPD -40°C to +85°C 8 Plastic DIP
MAX3430ESD -40°C to +85°C 8 SO
TOP VIEW
1
2
3
4
8
7
6
5
V CC
B
A
GND DI
DE
RE
RO
DIP/SO
R
D