MAX3465_V3 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – +5V, Fail-Safe, 40Mbps, Profibus RS-485/RS-422 Transceivers

19-3038; Rev 3; 5/12
+5V, Fail-Safe, 40Mbps, Profibus RS-485/
RS-422 Transceivers
General Description
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.
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.
Applications
High-Speed RS-485 Communications
High-Speed RS-422 Communications
Level Translators
Industrial-Control Local Area Networks
Profibus Applications
Features
♦ Recommended for Profibus Applications
♦ 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
♦ 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
PART
TEMP RANGE PIN-PACKAGE
MAX3465CSD
0°C to +70°C 14 SO
MAX3465CPD
0°C to +70°C 14 Plastic DIP
MAX3465ESD
-40°C to +85°C 14 SO
MAX3465EPD
-40°C to +85°C 14 Plastic DIP
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
PART
NUMBER
MAX3465
MAX3466
MAX3467
MAX3468
MAX3469
HALF/FULL
DUPLEX
Full
Full
Full
Half
Half
RECEIVER/
DRIVER
ENABLE
Yes
Yes
No
Yes
Yes
LOW-
POWER
SHUTDOWN
Yes
Yes
No
Yes
Yes
HOT SWAP
Yes
No
No
Yes
No
RECEIVER/
DRIVER PHASE
SELECT
Yes
Yes
No
No
No
INDEPENDENT
SHDN PIN
Yes
Yes
No
No
No
PIN COUNT
14
14
8
8
8
For pricing, delivery, and ordering information, please contact Maxim Direct
1
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.