MAX3291 Maxim, MAX3291 Datasheet
MAX3291
Manufacturer Part Number
MAX3291
Description
RS-485/RS-422 Transceivers with Preemphasis for High-Speed / Long-Distance Communication
Manufacturer
Maxim
Datasheet
1.MAX3291.pdf
(16 pages)
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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
19-1405; Rev 1; 4/99
________________General Description
Pin Configuration appears at end of data sheet.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Long-Distance, High-Speed RS-485/RS-422
Communications
Telecommunications
Industrial-Control Local Area Networks
for High-Speed, Long-Distance Communication
RS-485/RS-422 Transceivers with Preemphasis
RO
RE
DE
DI
(PSET)
________________________________________________________________ Maxim Integrated Products
PEE
2
3
4
5
1
R
C
7(6)
MAX3291
MAX3292
PSET
PSET
V
*
*
CC
GND
(V
14
CCD
A
B
Y
Z
)
13
12
11
10
9
1 F
Typical Operating Circuit and Functional Diagram
R = Z
R = Z
O
O
R = Z
R = Z
____________________________Features
_______________Ordering Information
MAX3291CSD
MAX3291CPD
MAX3291ESD
MAX3291EPD
MAX3292CSD
MAX3292CPD
MAX3292ESD
MAX3292EPD
O
O
Preemphasis Increases the Distance and Data
Rate of Reliable RS-485/RS-422 Communication
Data Rate
100nA Low-Current Shutdown Mode
Allow Up to 128 Transceivers on the Bus
-7V to +12V Common-Mode Input Voltage Range
Pin-Compatible with ’75180, MAX489, MAX491
MAX3080, MAX3083, MAX3086, MAX1482
(PSET)
Optimized for 5Mbps to 10Mbps (MAX3291)
Programmable up to 10Mbps (MAX3292)
10
11
12
PART
PEE
9
Y
Z
B
A
1
C
7(6)
R
MAX3291
MAX3292
PSET
PSET
V
*
*
CC
GND
(V
14
CCD
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
)
13
5
4
3
2
1 F
DE
RE
RO
DI
( ) ARE FOR MAX3292
Z
* MAX3292 ONLY
O
= THE CHARACTERISTIC
IMPEDANCE OF THE CABLE
14 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
14 Plastic DIP
PIN-PACKAGE
1
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