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PDF MAX3462EPA Data sheet ( Hoja de datos )
| Número de pieza | MAX3462EPA | |
| Descripción | +5V / Fail-Safe / 20Mbps / Profibus RS-485/ RS-422 Transceivers | |
| Fabricantes | Maxim Integrated | |
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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 54Ω load, 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 54Ω)
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.
1 page  
+5V, Fail-Safe, 20Mbps, Profibus RS-485/
RS-422 Transceivers
Typical Operating Characteristics (continued)
(VCC = +5V, TA = +25°C, unless otherwise noted.)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
50
40
30
20
10
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
11
10
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
IO = 4mA
140
120
100
80
-40
-15 10 35 60
TEMPERATURE (°C)
85
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
12
RDIFF = 54Ω
CL = 50pF
10
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
4.90
IO = -4mA
4.85
4.80
4.75
4.70
4.65
4.60
-40
-15 10 35 60
TEMPERATURE (°C)
85
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
4.0
RDIFF = 54Ω
3.5
9 8 3.0
8 6 2.5
7
-40
-15 10 35 60
TEMPERATURE (°C)
85
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
100
4
-40
-15 10 35 60
TEMPERATURE (°C)
85
OUTPUT CURRENT
vs. DRIVER OUTPUT LOW VOLTAGE
200
2.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
OUTPUT CURRENT
vs. DRIVER OUTPUT HIGH VOLTAGE
-160
160
-120
10
120
-80
80
1
-40
40
0.1
0
12 34
DIFFERENTIAL OUTPUT VOLTAGE (V)
5
0
0 3 6 9 12
OUTPUT LOW VOLTAGE (V)
0
-7 -5 -3 -1 1 3
OUTPUT HIGH VOLTAGE (V)
5
_______________________________________________________________________________________ 5
5 Page 
+5V, Fail-Safe, 20Mbps, Profibus RS-485/
RS-422 Transceivers
B
ATE VID
R
RECEIVER
OUTPUT
A
Figure 12. Receiver Propagation Delay Test Circuit
Applications Information
128 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12kΩ
(one-unit load), and the standard driver can drive up to
32 unit loads. The MAX3460–MAX3464 family of trans-
ceivers has a 1/4-unit-load receiver input impedance
(48kΩ), allowing up to 128 transceivers to be connect-
ed in parallel on one communication line. Any combina-
tion of these devices and/or other RS-485 transceivers
with a total of 32 unit loads or less can be connected to
the line.
Low-Power Shutdown Mode
(except MAX3462)
Low-power shutdown mode is initiated by bringing
SHDN high (MAX3460/MAX3461), or both RE high and
DE low. In shutdown, the devices typically draw only
1µA of supply current. RE and DE can be driven simul-
taneously; the parts are guaranteed not to enter shut-
down if RE is high and DE is low for less than 50ns. If
the inputs are in this state for at least 800ns, the parts
are guaranteed to enter shutdown.
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus con-
tention. The first, a foldback current limit on the output
stage, provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
Typical Operating Characteristics). The second, a ther-
mal shutdown circuit, forces the driver outputs into a
high-impedance state if the die temperature exceeds
+140°C.
Propagation Delay
Many digital encoding schemes depend on the difference
between the driver and receiver propagation delay times.
Typical propagation delays are shown in the Typical
Operating Characteristics. The difference in receiver delay
times, |tPLH - tPHL|, is a maximum of 2ns. The driver skew
time |tPLH - tPHL| is also a maximum of 2ns.
Typical Applications
The MAX3460–MAX3464 transceivers are designed for
bidirectional data communications on multipoint bus
transmission lines. Figures 13 and 14 show typical net-
work applications circuits. To minimize reflections, the
line should be terminated at both ends in its character-
istic impedance, and stub lengths off the main line
should be kept as short as possible.
Profibus Termination
The MAX3460–MAX3464 are designed for driving
Profibus termination networks. With a worst-case load-
ing of two termination networks with 220Ω termination
impedance and 390Ω pullups and pulldowns, the dri-
vers can drive VA-B> 2.1V output.
Chip Information
TRANSISTOR COUNT: 610
PROCESS: BiCMOS
Ordering Information (continued)
PART
MAX3461CSD
MAX3461CPD
MAX3461ESD
MAX3461EPD
MAX3462CSA
MAX3462CPA
MAX3462ESA
MAX3462EPA
MAX3463CSA
MAX3463CPA
MAX3463ESA
MAX3463EPA
MAX3464CSA
MAX3464CPA
MAX3464ESA
MAX3464EPA
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
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
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX3462EPA.PDF ] | |
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