MAX3291-MAX3292 MAXIM [Maxim Integrated Products], MAX3291-MAX3292 Datasheet

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MAX3291-MAX3292

Manufacturer Part Number
MAX3291-MAX3292
Description
RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
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

Related parts for MAX3291-MAX3292

MAX3291-MAX3292 Summary of contents

Page 1

... 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. ...

Page 2

... Change in Magnitude of Common-Mode Output ∆V NP Voltage (Normal to Preemphasis) Input High Voltage V IH Input Low Voltage V IL Input Current I IN PEE Input Current (MAX3291) I PEE PSET Input Current (MAX3292) I PSET Output Leakage (Y and Driver Short-Circuit Output I OSD Current 2 _______________________________________________________________________________________ Operating Temperature Ranges MAX329_C_ D......................................................0° ...

Page 3

... V PSET CC = +25°C.) CONDITIONS Figures 3 and 54Ω, DIFF 50pF L1 L2 Figures 3 and 54Ω, DIFF 50pF L1 L2 MAX3291/MAX3292, Figures 3 and 10 PSET R = 54Ω, DIFF MAX3292 50pF 523kΩ PSET Figures 3 and 10 54Ω, DIFF C ...

Page 4

RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication SWITCHING CHARACTERISTICS (continued) (Typical Operating Circuit +5V ±5 Typical values are +5V and T = +25°C PARAMETER SYMBOL Driver Enable to Output High ...

Page 5

RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication __________________________________________Typical Operating Characteristics (V = +5V +25°C, unless otherwise noted TYPICAL PREEMPHASIS WAVEFORM 100ns/div DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. R DIFF 4.5 STRONG ...

Page 6

RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication ____________________________________Typical Operating Characteristics (continued +5V +25°C, unless otherwise noted DRIVER PROPAGATION DELAY 5V/ DI div 2.5V div 20ns/div NO-LOAD SUPPLY CURRENT ...

Page 7

... RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication PIN NAME MAX3291 MAX3292 1 — PEE — 1 PSET N. GND — CCD ODP ...

Page 8

RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication DIFF ODP Figure 3. Driver Timing Test Circuit DPLH DPHL ...

Page 9

... Don’t care Z = High impedance SHUTDOWN = Low-power shutdown; driver and receiver outputs are high impedance. _______________________________________________________________________________________ DIFFERENTIAL Figure 10. Preemphasis Timing RE MAX3291 MAX3292 DI DE OUTPUTS High-Z High-Z 1 High-Z and 1 SHUTDOWN ...

Page 10

... 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. ...

Page 11

... RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication Setting the Preemphasis Interval The MAX3291 has an internal fixed preemphasis interval of 100ns. Use the MAX3291 for existing designs requiring industry-standard ’75180 pin-compatibility at data rates of 5Mbps to 10Mbps. The MAX3292 has a resistor-programmable preemphasis interval for more flexibility. For data rates less than 1Mbps, ...

Page 12

... Low-Power Shutdown Mode Initiate low-power shutdown mode by bringing RE high and DE low. In shutdown the MAX3291/MAX3292 typi- cally draw only 1µA of supply current. Simultaneously driving RE and DE is allowed; the parts are guaranteed not to enter shutdown high and DE is low for less than 80ns ...

Page 13

... RS-485/RS-422 levels with 128 receivers, but the preemphasis effect is significantly diminished. The MAX3291/ MAX3292 are centered for a load imped- ance of 54Ω, which corresponds to the parallel combina- tion of the cable impedance and termination resistors. If your cable impedance deviates somewhat from this ...

Page 14

... RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication Pin Configuration TOP VIEW MAX3291 MAX3292 PEE (PSET N.C. (GND) 6 GND 7 SO/DIP ( ) ARE FOR THE MAX3292 ONLY. 14 ______________________________________________________________________________________ TRANSISTOR COUNT: 2280 SUBSTRATE CONNECTED TO GND V CC N.C. ( ...

Page 15

RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication ________________________________________________________Package Information ______________________________________________________________________________________ 15 ...

Page 16

RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication ___________________________________________Package Information (continued) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to ...

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