±60V Fault-Protected, 10Mbps, Fail-Safe RS-485 Transceiver
with ±15kV ESD Protection
General Description
The MAX3443E fault-protected RS-485/RS-422 transceiver features ±60V protection from signal faults on communication bus lines. Each device contains one differential line driver with three-state output, and one differential line receiver with three-state input. The 1/4-unit-load receiver input impedance allows up to 128 transceivers on a single bus. The device operates from a 5V supply at data rates up to 10Mbps. True fail-safe inputs guarantee a logic-high receiver output when the receiver inputs are open, shorted, or connected to an idle data line.
Hot-swap circuitry eliminates false transitions on the data cable during circuit initialization or connection to a live backplane. Short-circuit current limiting and thermal shutdown circuitry protect the driver against excessive power dissipation, and integrated ±15kV ESD protection eliminates costly external protection devices.
The MAX3443E is available in 8-pin SO and PDIP packages, and is specified over commercial, industrial, and automotive temperature ranges.
Applications
RS-422/RS-485 Communications
Industrial Networks
Telecommunication Systems
Automotive Applications
HVAC Controls
Features
♦ ±60V Fault Protection
♦ ±15kV ESD Protection
♦ Guaranteed 10Mbps Data Rate
♦ Allows Up to 128 Transceivers on the Bus
♦ -7V to +12V Common-Mode Input Range
♦ True Fail-Safe Receiver Inputs
♦ Hot-Swap Inputs for Telecom Applications
♦ Automotive Temperature Range (-40°C to +125°C)
♦ Industry-Standard Pinout
Pin Configuration and Typical Operating Circuit
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced with Respect to GND
VCC ........................................................................................+7V
RE, DE, DI...................................................-0.3V to (VCC + 0.3V)
A, B (Note 1) ........................................................................±60V
RO ..............................................................-0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
8-Pin PDIP (derate 9.09mW/°C above +70°C).............727mW
Operating Temperature Ranges
MAX3443EC_ _ ..................................................0°C to +70°C
MAX3443EE_ _ ...............................................-40°C to +85°C
MAX3443EA_ _ .............................................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Short-Circuit Duration (RO, A, B) ...............................Continuous
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: A, B must be terminated with 54Ω or 100Ω to guarantee ±60V fault protection.
DC ELECTRICAL CHARACTERISTICS
(VCC = +4.75V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
| PARAMETER |
SYMBOL |
CONDITIONS |
MIN TYP MAX |
UNITS |
| DRIVER |
| Differential Driver Output |
VOD |
Figure 1, RL = 50Ω |
2.0 VCC |
V |
| Figure 1, RL = 27Ω |
1.5 VCC |
|
Change in Magnitude of
Differential Output Voltage
|
∆VOD |
Figure 1, RL = 50Ω or 27Ω (Note 2) |
0.2 |
V |
|
Driver Common-Mode Output
Voltage
|
VOC |
Figure 1, RL = 50Ω or 27Ω |
VCC / 2 3 |
V |
|
Change In Magnitude of
Common-Mode Voltage
|
∆VOC |
Figure 1, RL = 50Ω or 27Ω (Note 2) |
0.2 |
V |
| RECEIVER |
| Input Current |
IA,B |
A,B |
DE = GND, VCC = GND, VA, B = +12V |
250 |
µA |
| VA, B = -7V |
-150 |
µA |
| VA, B = ±60V |
±6 |
mA |
|
Receiver Differential
Threshold Voltage
|
VTH |
-7V ≤ VCM ≤ +12V |
-200 -50 |
mV |
| Receiver Input Hysteresis |
∆VTH |
|
25 |
mV |
| RECEIVER LOGIC |
| Output High Voltage |
VOH |
Figure 2, IOH = -1.6mA |
VCC - 0.6 |
V |
| Output Low Voltage |
VOL |
Figure 2, IOL = 1mA |
0.4 |
V |
|
Three-State Output Current at
Receiver
|
IOZR |
0 ≤ VA, B ≤ VCC |
±1 |
µA |
| Receiver Input Resistance |
RIN |
-7V ≤ VCM ≤ +12V |
48 |
kΩ |
|
Receiver Output Short-Circuit
Current
|
IOSR |
0 ≤ VRO ≤ VCC |
±95 |
mA |
| CONTROL |
| Control Input High Voltage |
VCIH |
DE, RE |
2.0 |
V |
|
Input Current DE Current Latch
During First DE Rising Edge
|
|
|
90 |
µA |
|
Input Current RE Current Latch
During First RE Falling Edge
|
|
|
90 |
µA |
Product Tags:
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60V Fault-Protected 10Mbps Fail-Safe RS-485 Transceiver with 15kV ESD Protection MAX3443EASA+ Images
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