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PDF MAX3430 Data sheet ( Hoja de datos )
| Número de pieza | MAX3430 | |
| Descripción | 80V Fault-Protected / Fail-Safe / 1/4-Unit Load / #.3V RS-485 Transceiver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX3430 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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19-2756; Rev 1; 4/03
±80V Fault-Protected, Fail-Safe,
1/4-Unit Load, +3.3V RS-485 Transceiver
General Description
The MAX3430 fault-protected RS-485 transceiver features
±80V protection from overvoltage signal faults on commu-
nication bus lines. Each device contains one driver and
one receiver, and the output pins can withstand faults,
with respect to ground, of up to ±80V. Even if the faults
occur when the transceiver is active, shut down, or pow-
ered off, the device will not be damaged. The MAX3430
operates from a 3.3V supply and features a slew-rate-lim-
ited driver that minimizes EMI and reduces reflections
caused by improperly terminated cables, allowing error-
free data transmission at data rates up to 250kbps. The
MAX3430 has a 1/4-unit-load receiver input impedance
allowing up to 128 transceivers on a single bus and fea-
tures fail-safe circuitry, which guarantees a logic-high
receiver output when the receiver inputs are open.
Hot-swap circuitry eliminates false transitions on the
data cable during circuit initialization or connection to a
live backplane. Short-circuit current limiting and ther-
mal-shutdown circuitry protect the driver against exces-
sive power dissipation.
The MAX3430 is available in 8-pin SO and 8-pin PDIP
packages, and is specified over commercial and indus-
trial temperature ranges.
Applications
RS-422/RS-485 Communications
Lighting Systems
Industrial-Control Local Area Networks
Profibus Applications
Multimaster RS-485 Networks
Features
o ±80V Fault Protection
o ±12kV ESD Protection
o +3.3V Operation
o Internal Slew-Rate Limiting
o 250kbps Data Rate
o Allows Up to 128 Transceivers on the Bus
o -7V to +12V Common-Mode Input Voltage Range
o True Fail-Safe Inputs
o Hot-Swap Input Structure on DE
o Available in 8-Pin SO and PDIP Packages
PART
MAX3430CPA
MAX3430CSA
MAX3430EPA
MAX3430ESA
Ordering Information
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
Pin Configuration and Typical Operating Circuit
TOP VIEW
RO 1
RE 2
DE 3
DI 4
R
D
DIP/SO
8 VCC
7B
6A
5 GND
RO 1
RE 2
3
DE
DI 4
R
D
VCC
8
7B
Rt
6
A
5
GND
0.1µF
MAX3430
B
Rt
A
DE
D
R
RE
DI
RO
________________________________________________________________ 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  
±80V Fault-Protected, Fail-Safe,
1/4-Unit Load, +3.3V RS-485 Transceiver
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT
vs. TEMPERATURE
5
RE = 0
DE = VCC
4
3
2
1
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGE
18
15
12
9
6
3
SHUTDOWN CURRENT
vs. TEMPERATURE
200
175
150
125
100
75
50
25
0
-40
-20
0 20 40 60
TEMPERATURE (°C)
80
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
3.30
IO = -1.6mA
3.25
3.20
3.15
3.10
3.05
OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGE
20
16
12
8
4
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT LOW VOLTAGE (V)
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
0.5
IO = +1mA
0.4
0.3
0.2
0.1
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT HIGH VOLTAGE (V)
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
120
100
80
60
40
20
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
DIFFERENTIAL OUTPUT VOLTAGE (V)
3.00
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
3.5
3.0
RL = 100Ω
2.5
2.0
RL = 54Ω
1.5
1.0
0.5
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
0
-40 -20 0
20 40 60 80
TEMPERATURE (°C)
A, B CURRENT
vs. A, B VOLTAGE (TO GROUND)
3
2
1
0
-1
-2
RE = DE = GND
-3
-80 -60 -40 -20 0 20 40 60 80
A, B VOLTAGE (V)
_______________________________________________________________________________________ 5
5 Page 
±80V Fault-Protected, Fail-Safe,
1/4-Unit Load, +3.3V RS-485 Transceiver
Applications Information
128 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12kΩ
(one-unit load), and a standard driver can drive up to
32-unit loads. The MAX3430 transceiver 1/4-unit-load
receiver input impedance (48kΩ) allows up to 128
transceivers connected in parallel on one communica-
tion line. Connect any combination of these devices,
and/or other RS-485 devices, for a maximum of 32 unit
loads to the line.
RS-485 Applications
The MAX3430 transceiver provides bidirectional data
communications on multipoint bus transmission lines.
Figure 10 shows a typical network applications circuit.
The RS-485 standard covers line lengths up to 4000ft.
The signal line must be terminated at both ends in its
characteristic impedance, and stub lengths off the
main line kept as short as possible.
Chip Information
TRANSISTOR COUNT: 300
PROCESS: BiCMOS
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX3430.PDF ] | |
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