MAX3291 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication

19-1405; Rev 1; 4/99
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
________________General Description
The MAX3291/MAX3292 high-speed RS-485/RS-422
transceivers feature driver preemphasis circuitry, which
extends the distance and increases the data rate of reli-
able communication by reducing intersymbol interfer-
ence (ISI) caused by long cables. The MAX3291 is
programmable for data rates of 5Mbps to 10Mbps,
while the MAX3292 is programmable for data rates up
to 10Mbps by using a single external resistor.
The MAX3291/MAX3292 are full-duplex devices that
operate from a single +5V supply and offer a low-cur-
rent shutdown mode that reduces supply current to
100nA. They feature driver output short-circuit current
limiting and a fail-safe receiver input that guarantees a
logic-high output if the input is open circuit. A 1/4-unit-
load receiver input impedance allows up to 128 trans-
ceivers on the bus.
________________________Applications
Long-Distance, High-Speed RS-485/RS-422
Communications
Telecommunications
Industrial-Control Local Area Networks
____________________________Features
o Preemphasis Increases the Distance and Data
Rate of Reliable RS-485/RS-422 Communication
o Data Rate
Optimized for 5Mbps to 10Mbps (MAX3291)
Programmable up to 10Mbps (MAX3292)
o 100nA Low-Current Shutdown Mode
o Allow Up to 128 Transceivers on the Bus
o -7V to +12V Common-Mode Input Voltage Range
o Pin-Compatible with ’75180, MAX489, MAX491
MAX3080, MAX3083, MAX3086, MAX1482
_______________Ordering Information
PART
MAX3291CSD
MAX3291CPD
MAX3291ESD
MAX3291EPD
MAX3292CSD
MAX3292CPD
MAX3292ESD
MAX3292EPD
TEMP. RANGE
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
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
14 Plastic DIP
Typical Operating Circuit and Functional Diagram
R_PSET*
R_PSET*
1µF
PEE
(PSET)
2
RO
3
RE
4
DE
DI ⁵
C_PSET*
1
V_CC 14
(V_CCD) ¹³
A 12
B 11
Z 10
Y9
R = Z_O
R = Z_O
MAX3291
MAX3292
7(6) GND
1µF
R = Z_O
R = Z_O
PEE C_PSET*
(PSET) ₁
V_{CC 14}
(V_CCD)
9Y
10
Z
11 B
12
A
MAX3291
MAX3292
7(6) GND
13
5 _DI
4 _DE
3 _RE
2
RO
( ) ARE FOR MAX3292
* MAX3292 ONLY
Z_O = THE CHARACTERISTIC
IMPEDANCE OF THE CABLE
Pin Configuration appears at end of data sheet.
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