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MAX3291CSD

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
________________________________________________________________
Maxim Integrated Products
1
19-1405; Rev 1; 4/99
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.
________________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
♦ Preemphasis Increases the Distance and Data
Rate of Reliable RS-485/RS-422 Communication
♦ Data Rate
Optimized for 5Mbps to 10Mbps (MAX3291)
Programmable up to 10Mbps (MAX3292)
♦ 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
2
PEE
(PSET)
12
13
R = Z
O
R = Z
O
R = Z
O
R = Z
O
14
1
1µF
R
PSET
*
C
PSET
*C
PSET
*
7(6)
GND
11
10
9
( ) ARE FOR MAX3292
* MAX3292 ONLY
Z
O
= THE CHARACTERISTIC
IMPEDANCE OF THE CABLE
RO
RE
DE
DI
3
4
5
9
5
13
7(6)
GND
4
3
DI
DE
RE
RO
2
10
11
12
V
CC
(V
CCD
)(V
CCD
)
PEE
(PSET)
14
1
1µF
R
PSET
*
V
CC
MAX3291
MAX3292
MAX3291
MAX3292
A
B
Z
Y
Y
Z
B
A
Typical Operating Circuit and Functional Diagram
PART
MAX3291CSD
MAX3291CPD
MAX3291ESD -40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
14 SO
14 Plastic DIP
14 SO
_______________Ordering Information
MAX3291EPD -40°C to +85°C 14 Plastic DIP
MAX3292CSD
MAX3292CPD
MAX3292ESD -40°C to +85°C
0°C to +70°C
0°C to +70°C 14 SO
14 Plastic DIP
14 SO
MAX3292EPD -40°C to +85°C 14 Plastic DIP
Pin Configuration appears at end of data sheet.
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, V
CC
= +5V ±5%, R
PSET
= 0 (MAX3292), V
CC
= V
CCD
(MAX3292), T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (V
CC
, V
CCD
) .................................................+6V
Control Input Voltage (
RE, DE, PEE,
PSET, DI).................................................-0.3V to (V
CC
+ 0.3V)
Driver Output Voltage (Y, Z)................................-7.5V to +12.5V
Receiver Input Voltage (A, B)..............................-7.5V to +12.5V
Receiver Output Voltage (RO)....................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
14-Pin SO (derate 8.7mW/°C above +70°C).................695mW
14-Pin Plastic DIP (derate 10.0mW/°C above +70°C) ..800mW
Operating Temperature Ranges
MAX329_C_ D......................................................0°C to +70°C
MAX329_E_ D...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
R = 27Ω
DE = GND,
V
CC
= GND or 5.25V
V
PSET
= V
CC
DE, DI, RE
DE, DI, RE, PEE
DE, DI, RE
CONDITIONS
V2.4V
ODP
Differential Driver Output with
Preemphasis
µA
-25
I
O
Output Leakage (Y and Z)
25
µA70 110I
PSET
PSET Input Current (MAX3292)
V
2.4
V
IH
Input High Voltage
V0.8V
IL
Input Low Voltage
µA±2I
IN
Input Current
µA-15 -30 -45I
PEE
PEE Input Current (MAX3291)
UNITSMIN TYP MAXSYMBOLPARAMETER
Figure 1, R = 27Ω (Note 3) V1.65 2.0 2.35DPER
Differential Driver
Preemphasis Ratio
Figure 1, R = 27Ω (Note 4) V0.2
∆V
OD
,
∆V
ODP
Change in Magnitude of
Differential Output Voltage
(Normal and Preemphasis)
Figure 1, R = 27Ω VV
CC
/ 2 3V
OC
Driver Common-Mode Output
Voltage (Normal and
Preemphasis)
Figure 1, R = 27Ω (Note 5) V0.3∆V
OC
Change in Magnitude of
Common-Mode Voltage
(Normal and Preemphasis)
Figure 1, R = 27Ω mV50∆V
NP
Change in Magnitude of
Common-Mode Output
Voltage (Normal to
Preemphasis)
-7V ≤ V
OUT
≤ +12V (Note 6) mA±30 ±250I
OSD
Driver Short-Circuit Output
Current
V
Y
= V
Z
= +12V
V
Y
= V
Z
= -7V
R = 27Ω
Figure 1
No load (Note 2)
V
5.25
V
OD
1.5 5.0
Differential Driver Output
PEE 3.75
DRIVER
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V
CC
= +5V ±5%, R
PSET
= 0 (MAX3292), V
CC
= V
CCD
(MAX3292), T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
SWITCHING CHARACTERISTICS
(Typical Operating Circuit, V
CC
= +5V ±5%, R
PSET
= 0 (MAX3292), V
CC
= V
CCD
(MAX3292), T
A
= +25°C, unless otherwise noted.
Typical values are at V
CC
= +5V and T
A
= +25°C.)
-7V ≤ V
CM
≤ +12V
RE = V
CC,
DE = GND, V
Y
= V
Z
= 0 to V
CC
or
floating
RE = GND, DE = V
CC
0 ≤ V
O
≤ V
CC
-7V ≤ V
CM
≤ +12V
0 ≤ V
RO
≤ V
CC
CONDITIONS
mV-200 200V
TH
Receiver Differential
Threshold Voltage
µA0.1 1I
SHDN
Supply Current in Shutdown
Mode
mA2.0 3.0I
CC +
I
CCD
No-Load Supply Current
µA0.1 ±1I
OZR
Three-State Output Current at
Receiver
kΩ48R
IN
Receiver Input Resistance
mA±15 ±95I
OSR
Receiver Output Short-Circuit
Current
UNITSMIN TYP MAXSYMBOLPARAMETER
V
A
= V
B
= 0 mV35∆V
TH
Receiver Input Hysteresis
I
O
= -4mA, V
A
- V
B
= V
TH
V3.5V
OH
Receiver Output High Voltage
I
O
= 4mA, V
A
- V
B
= -V
TH
V0.4V
OL
Receiver Output Low Voltage
DE = GND,
V
CC
= GND or 5.25V
µA
-150
I
A
,
B
250
Input Current (A and B)
V
IN
= +12V
V
IN
= -7V
Driver Differential Output
Rise or Fall Time
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 50pF
ns
44 65t
DPHL
Driver Propagation Delay
CONDITIONS
t
HL
12
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 50pF
ns
t
LH
Differential Driver Output
Skew t
DPLH
- t
DPHL
Figures 3 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 50pF
ns30t
PTND
Preemphasis Voltage Level to
Normal Voltage Level Delay
t
DSKEW
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 50pF
38ns
Mbps10f
MAX
Maximum Data Rate
41 65t
DPLH
UNITSMIN TYP MAXSYMBOLPARAMETER
RECEIVER
SUPPLY CURRENT
Driver Preemphasis Interval t
PRE
80 100 120
Figures 3 and 10,
R
DIFF
= 54Ω,
C
L1
= C
L2
= 50pF
ns
0.75 1 1.25 µs
MAX3292,
R
PSET
= 523kΩ
MAX3291/MAX3292,
R
PSET
= 0
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX3291CSD

Mfr. #:
Buy MAX3291CSD
Manufacturer:
Maxim Integrated
Description:
RS-422/RS-485 Interface IC RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
Lifecycle:
New from this manufacturer.
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