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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX3460 Datasheet

+5V / Fail-Safe / 20Mbps / Profibus RS-485/ RS-422 Transceivers

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19-2217; Rev 1; 2/03
+5V, Fail-Safe, 20Mbps, Profibus RS-485/
RS-422 Transceivers
General Description
The MAX3460–MAX3464 are high-speed differential
bus transceivers for RS-485 and RS-422 communica-
tions. They are designed to meet TIA/EIA-422-B,
TIA/EIA-485-A, V.11, and X.27 standards. The trans-
ceiver complies with the Profibus specification provid-
ing +2.1V output level with a 54load, 20Mbps data
rate, and output skew less than 2ns. Each part contains
one three-state differential line driver and one differen-
tial input line receiver. The devices operate from a +5V
supply and feature true fail-safe circuitry, which guaran-
tees a logic-high receiver output when the receiver
inputs are open or shorted. This enables all receiver
outputs on a terminated bus to output logic highs when
all transmitters are disabled.
All devices feature a 1/4 standard unit load receiver
input impedance that allows 128 transceivers on the
bus. Driver and receiver propagation delays are guar-
anteed under 20ns for multidrop, clock distribution
applications. Drivers are short-circuit current limited
and are protected against excessive power dissipation
by thermal shutdown circuitry. The driver and receiver
feature active-high and active-low enables, respective-
ly, that can be connected together externally to serve
as a direction control.
Features
o Recommended for Profibus Applications
o Guaranteed 20Mbps Data Rate
o 20ns Transmitter and Receiver Propagation Delay
o 2ns Transmitter and Receiver Skew
o High Differential Driver Output Level (2.1V on 54)
o Hot-Swap Versions
o 1µA Shutdown Supply Current
o Low Supply Current Requirements (2.5mA typ)
o Allow Up to 128 Transceivers on the Bus
o True Fail-Safe Receiver while Maintaining EIA/TIA-
485 Compatibility
o Designed for Multipoint Transmissions on Long
or Noisy Bus Lines
o Full Duplex and Half Duplex Versions Available
o Phase Controls to Correct for Twisted-Pair
Reversal for 14-Pin Versions
o Current-Limiting and Thermal Shutdown for
Driver Overload Protection
Applications
High-Speed RS-485 Communications
High-Speed RS-422 Communications
Level Translators
Industrial-Control Local Area Networks
Profibus Applications
Ordering Information
PART
MAX3460CSD
MAX3460CPD
MAX3460ESD
MAX3460EPD
TEMP RANGE
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
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Selector Guide
PART
NUMBER
MAX3460
MAX3461
MAX3462
MAX3463
MAX3464
HALF/FULL
DUPLEX
Full
Full
Full
Half
Half
RECEIVER/
DRIVER
ENABLE
Yes
Yes
No
Yes
Yes
LOW-
POWER
SHUTDOWN
Yes
Yes
No
Yes
Yes
HOT SWAP
Yes
No
No
Yes
No
RECEIVER/
DRIVER PHASE
SELECT
Yes
Yes
No
No
No
INDEPENDENT
SHDN PIN
Yes
Yes
No
No
No
PIN COUNT
14
14
8
8
8
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX3460 Datasheet

+5V / Fail-Safe / 20Mbps / Profibus RS-485/ RS-422 Transceivers

No Preview Available !

+5V, Fail-Safe, 20Mbps, Profibus RS-485/
RS-422 Transceivers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) to GND ..................................-0.3V to +6V
Control Input Voltage (RE, DE, DI, SHDN, TXP, RXP)
to GND....................................................-0.3V to (VCC + 0.3V)
Driver Output Voltage (Y, Z) to GND .........................-8V to +13V
Receiver Input Voltage (A, B) to GND.......................-8V to +13V
Differential Driver Output Voltage (Y - Z) ...............................±8V
Differential Receiver Input (A - B) ..........................................±8V
Receiver Output Voltage (RO) to GND.......-0.3V to (VCC + 0.3V)
Output Driver Current (Y, Z) ...........................................±250mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
8-Pin DIP (derate 9.09mW/°C above +70°C) ...............727mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
14-Pin DIP (derate 10mW/°C above +70°C) ................800mW
Operating Temperature Range
MAX346_C__ ......................................................0°C to +70°C
MAX346_E__....................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
Power-Supply Range
DRIVER
Differential Driver Output (no load)
Differential Driver Output
Change in Magnitude of
Differential Output Voltage
SYMBOL
VCC
VOD
VOD
VOD
CONDITIONS
Figure 5, R =
Figure 5, R = 27
Figure 5, R = 50or 27
(Note 2)
MIN
4.75
TYP
MAX UNITS
5.25 V
VCC
V
2.1 V
0.2 V
Driver Common-Mode Output
Voltage
VOC Figure 5, R = 50or 27
3V
Change in Magnitude of
Common-Mode Voltage
Input High Voltage
Input Low Voltage
Input Hysteresis
Output Leakage (Y and Z) Full
Duplex
Input Current
Pulldown Current
Driver Short-Circuit Output
Current (Note 3)
Driver Short-Circuit Foldback
Output Current (Note 3)
Thermal Shutdown Threshold
RECEIVER
Differential Input Capacitance
Input Current (A and B) Full
Duplex
Receiver Differential Threshold
Voltage
VOC
VIH
VIL
VHYS
IO
IIN
IOSD
IOSFD
Figure 5, R = 50or 27
(Note 2)
DE, DI, RE, SHDN
DE, DI, RE, SHDN
DE, DI, RE, SHDN
DE = GND, VCC =
GND or +5.25V
DI, RE, DE, SHDN
VIN = +12V
VIN = -7V
RXP = TXP = VCC
0 VOUT 12V, output low
-7V VOUT VCC, output high
(VCC - 1V) VOUT 12V, output low
-7V VOUT 1V, output high
CA, B
IA, B
VTH
DE = GND,
VCC = GND or 5.25V
-7V VCM 12V
VIN = +12V
VIN = -7V
2.0
-100
5
-250
+25
0.2
0.8
50
+125
±1
15 30
+250
-25
140
V
V
V
mV
µA
µA
µA
mA
mA
°C
8
-200
-200
-125
250
-50
pF
µA
mV
2 _______________________________________________________________________________________



Part Number MAX3460
Description +5V / Fail-Safe / 20Mbps / Profibus RS-485/ RS-422 Transceivers
Maker Maxim
Total Page 14 Pages
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MAX3460 Datasheet PDF





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