MAX3483ECSA+ Maxim, MAX3483ECSA+ Datasheet - Page 13

• Manufacturer Part Number: MAX3483ECSA+
• Description: Transceiver; RS-485/RS-422; 2 V (Min.) (Input High), 0.8 V (Max.) (Input Low)
• Manufacturer: Maxim

Specifications of MAX3483ECSA+

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

Excessive output current and power dissipation caused
by faults or by bus contention are prevented by two
mechanisms. A foldback current limit on the output stage
provides immediate protection against short circuits over
the whole common-mode voltage range (see Typical
Operating Characteristics ). In addition, a thermal shut-
down circuit forces the driver outputs into a high-imped-
ance state if the die temperature rises excessively.
Figures 15–18 show the typical propagation delays. Skew
time is simply the difference between the low-to-high and
high-to-low propagation delay. Small driver/receiver
skew times help maintain a symmetrical mark-space
ratio (50% duty cycle).
The receiver skew time,
(20ns for the MAX3483E/MAX3488E). The driver skew
times are 8ns for the MAX3485E/MAX3490E/MAX3491E,
12ns for the MAX3486E, and typically under 50ns for the
MAX3483E/MAX3488E.
The RS-485/RS-422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, see
Figure 21 for an example of a line repeater.
Figures 19 and 20 show the system differential voltage
for parts driving 4000 feet of 26AWG twisted-pair wire
at 125kHz into 120Ω loads.
For faster data rate transmission, please consult the fac-
tory.
Figure 21. Line Repeater for MAX3488E/MAX3490E/MAX3491E
Slew-Rate-Limited True RS-485/RS-422 Transceivers
NOTE: RE AND DE ON MAX3491E ONLY.
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
RO
DE
RE
DI
D
______________________________________________________________________________________
R
Line Length vs. Data Rate
Driver-Output Protection
|
t
PRLH
A
B
Z
Y
120
120
Propagation Delay
- t
PRHL
MAX3488E
MAX3490E
MAX3491E
|
, is under 10ns
DATA IN
DATA OUT
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
The driver outputs and receiver inputs of the MAX3483E
family of devices have extra protection against static
electricity. Maxim’s engineers have developed state-of-
the-art structures to protect these pins against ESD of
±15kV without damage. The ESD structures withstand
high ESD in all states: normal operation, shutdown, and
powered down. After an ESD event, Maxim’s E versions
keep working without latchup or damage.
ESD protection can be tested in various ways; the
transmitter outputs and receiver inputs of this product
family are characterized for protection to the following
limits:
1) ±15kV using the Human Body Model
2) ±8kV using the Contact-Discharge method specified
3) ±15kV using IEC 1000-4-2’s Air-Gap method.
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Figure 22a shows the Human Body Model and Figure
22b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5kΩ resistor.
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi-
cally refer to integrated circuits. The MAX3483E family
of devices helps you design equipment that meets
Level 4 (the highest level) of IEC 1000-4-2, without the
need for additional ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2, because series resistance is
lower in the IEC 1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 1000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 23a shows the IEC 1000-4-2 model, and
Figure 23b shows the current waveform for the ±8kV
IEC 1000-4-2, Level 4 ESD contact-discharge test.
in IEC 1000-4-2
±15kV ESD Protection
ESD Test Conditions
Human Body Model
IEC 1000-4-2
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