MAX3483/MAX3485/MAX3486/
MAX3488/MAX3490/MAX3491
3.3V-Powered, 10Mbps and Slew-Rate-Limited
True RS-485/RS-422 Transceivers
_______________General 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 fullduplex communication, while the MAX3483, MAX3485,
and MAX3486 are designed for half-duplex communication.
________________________Applications
Low-Power RS-485/RS-422 Transceivers
____________________________Features
o Operate from a Single 3.3V Supply—
No Charge Pump!
o Interoperable with +5V Logic
o 8ns Max Skew (MAX3485/MAX3490/MAX3491)
o Slew-Rate Limited for Errorless Data Transmission
(MAX3483/MAX3488)
o 2nA Low-Current Shutdown Mode
(MAX3483/MAX3485/MAX3486/MAX3491)
o -7V to +12V Common-Mode Input Voltage Range
o Allows up to 32 Transceivers on the Bus
o Full-Duplex and Half-Duplex Versions Available
o Industry Standard 75176 Pinout
(MAX3483/MAX3485/MAX3486)
o Current-Limiting and Thermal Shutdown for
Driver Overload Protection
______________Ordering Information
PART
MAX3483CPA
Telecommunications
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Functional Diagrams
MAX3483CSA
MAX3483C/D
MAX3483EPA
MAX3483ESA
MAX3485CPA
MAX3485CSA
MAX3485C/D
MAX3485EPA
MAX3485ESA
TEMP. RANGE
PIN-PACKAGE
0°C to +70°C
8 Plastic DIP
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
8 SO
Dice*
8 Plastic DIP
8 SO
8 Plastic DIP
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
8 SO
Dice*
8 Plastic DIP
8 SO
Ordering Information continued at end of data sheet.
* Contact factory for for dice specifications.
______________________________________________________________Selection Table
PART
NUMBER
GUARANTEED
DATA RATE
(Mbps)
MAX3483
MAX3485
SUPPLY
VOLTAGE
(V)
HALF/FULL
DUPLEX
SLEW-RATE
LIMITED
DRIVER/
RECEIVER
ENABLE
SHUTDOWN
CURRENT
(nA)
PIN
COUNT
0.25
Half
Yes
Yes
2
8
10
Half
No
Yes
2
8
Half
Yes
Yes
2
8
Full
Yes
No
—
8
Full
No
No
—
8
Full
No
Yes
2
14
MAX3486
2.5
3.0 to 3.6
PinMAX3488
Configurations appear at end of data sheet.
0.25
Functional Diagrams continued at end of data sheet.
MAX3490
10
UCSP is a trademark of Maxim Integrated Products, Inc.
MAX3491
10
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0333; Rev 0; 12/94
