19-3038; Rev 3; 5/12
+5V, Fail-Safe, 40Mbps, Profibus RS-485/
RS-422 Transceivers
5–MAX3469
General Description
Features
♦ Recommended for Profibus Applications
The MAX3465–MAX3469 are high-speed differential
bus transceivers for RS-485 and RS-422 communica-
tions. They are designed to meet TIA/EIA-422-B,
TIA/EIA-485-A, V.11, and X.27 standards. The trans-
ceiver complies with the Profibus specification provid-
ing +2.1V minimum output level with a 54Ω load,
40Mbps data rate, and output skew less than 2ns. Each
part contains one three-state differential line driver and
one differential input line receiver. The devices operate
from a +5V supply and feature true fail-safe circuitry,
which guarantees a logic-high receiver output when the
receiver inputs are open or shorted. This enables all
receiver outputs on a terminated bus to output logic
highs when all transmitters are disabled.
♦ Up to 40Mbps Data Rate
♦ 15ns Transmitter Propagation Delay
♦ 20ns Receiver Propagation Delay
♦ 2ns Transmitter and Receiver Skew
♦ High Differential Driver Output Level (2.1V on 54Ω)
♦ Hot-Swap Versions
♦ 1µA Shutdown Supply Current
♦ Low Supply Current Requirements (2.5mA, typ)
♦ Allow Up to 128 Transceivers on the Bus
All devices feature a 1/4-standard-unit load receiver
input impedance that allows 128 transceivers on the
bus. Driver and receiver propagation delays are guar-
anteed under 20ns for multidrop, clock distribution
applications. Drivers are short-circuit current limited
and are protected against excessive power dissipation
by thermal-shutdown circuitry. The driver and receiver
feature active-high and active-low enables, respective-
ly, that can be connected together externally to serve
as a direction control.
♦ True Fail-Safe Receiver while Maintaining EIA/TIA-
485 Compatibility
♦ Designed for Multipoint Transmissions on Long
or Noisy Bus Lines
♦ Full-Duplex and Half-Duplex Versions Available
♦ Phase Controls to Correct for Twisted-Pair
Reversal for 14-Pin Versions
♦ Current-Limiting and Thermal Shutdown for
Driver Overload Protection
Ordering Information
Applications
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 SO
High-Speed RS-485 Communications
High-Speed RS-422 Communications
Level Translators
MAX3465CSD
MAX3465CPD
MAX3465ESD
MAX3465EPD
14 Plastic DIP
14 SO
14 Plastic DIP
Industrial-Control Local Area Networks
Profibus Applications
Ordering Information continued at end of data sheet.
Devices are also available in a lead(Pb)-free/RoHS-compliant
package. Specify lead-free by adding “+” to the part number
when ordering.
Pin Configurations appear at end of data sheet.
Selector Guide
RECEIVER/
DRIVER
ENABLE
LOW-
POWER
SHUTDOWN
RECEIVER/
DRIVER PHASE
SELECT
PART
NUMBER
HALF/FULL
DUPLEX
INDEPENDENT
SHDN PIN
HOT SWAP
PIN COUNT
MAX3465
MAX3466
MAX3467
MAX3468
MAX3469
Full
Full
Full
Half
Half
Yes
Yes
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
14
14
8
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
No
8
No
8
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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