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MAX3490

MAX3490

3.3V Powered, 10Mbps and Slew-Rate Limited, True RS-485/RS-422 Transceivers

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Overview

Description

The MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, and MAX3491 are 3.3V, low-power transceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver. The MAX3483 and MAX3488 feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The partially slew-rate-limited MAX3486 transmits up to 2.5Mbps. The MAX3485, MAX3490, and MAX3491 transmit at up to 10Mbps.

Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuit.

The MAX3488, MAX3490, and MAX3491 feature full-duplex communication, while the MAX3483, MAX3485, and MAX3486 are designed for half-duplex communication.
MAX3483, MAX3485, MAX3486: Typical Application Circuit MAX3483, MAX3485, MAX3486: Typical Application Circuit Enlarge+

Key Features

  • Operate from a Single 3.3V Supply-No Charge Pump!
  • Interoperable with +5V Logic
  • 8ns Max Skew (MAX3485/MAX3490/MAX3491)
  • Slew-Rate Limited for Errorless Data Transmission (MAX3483/MAX3488)
  • 2nA Low-Current Shutdown Mode (MAX3483/MAX3485/MAX3486/MAX3491)
  • -7V to +12V Common-Mode Input Voltage Range
  • Allows up to 32 Transceivers on the Bus
  • Full-Duplex and Half-Duplex Versions Available
  • Industry Standard 75176 Pinout (MAX3483/MAX3485/MAX3486)
  • Current-Limiting and Thermal Shutdown for Driver Overload Protection

Applications/Uses

  • Industrial Control Local Area Networks
  • Integrated Services Digital Networks
  • Low-Power RS-485/RS-422 Transceivers
  • Packet Switching
  • Telecommunications
  • Transceivers for EMI-Sensitive Applications

Parametric Specs

Part NumberTx/RxDuplexVSUPPLY
(V)		ICC
(mA)		Data Rate
(kbps)		Tx ENRx ENICC (Shutdn.)
(µA)		Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
(°C)		Package/PinsBudgetary
Price
typmintypSee Notes
MAX3483 1Tx + 1RxHalf3.31250YesYes0.00232OpenNo
-40 to +85
0 to +70
PDIP/8
SOIC (N)/8
$2.07 @1k
MAX3485 Half10000YesYes0.002
PDIP/8
SOIC (N)/8
$2.07 @1k
MAX3486 Half2500YesYes0.002
PDIP/8
SOIC (N)/8
$1.97 @1k
MAX3488 Full250NoNo-
PDIP/8
SOIC (N)/8
$2.07 @1k
MAX3490 Full10000NoNo-
PDIP/8
SOIC (N)/8
$2.07 @1k
MAX3491 Full10000YesYes0.002
PDIP/14
SOIC (N)/14
$2.07 @1k
See All RS-485/RS-422 Line Driver/Receivers (207)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

Tutorial 4993 Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface
Tutorial 4991 Oops...Practical ESD Protection vs. Foolhardy Placebos
App Note 651 ESD Protection for I/O Ports
App Note 639 Maxim Leads the Way in ESD Protection

Quality and Environmental Data

Product Reliability Reports: MAX3490.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

RS-485 Resources

Quality And Environmental

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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Technical Docs