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ISL32600E, ISL32601E, ISL32602E, ISL32603E
FN7967 Rev.2.00 Page 19 of 25
Jan 31, 2019
whether or not it is powered up without degrading the transceiver’s
CMR. The built-in ESD protection eliminates the need for board
level protection structures such as transient suppression diodes
and the associated undesirable capacitive load they present.
IEC61000-4-2 Testing
The IEC61000 test method applies to finished equipment, rather
than to an individual IC. Therefore, the pins most likely to suffer
an ESD event are those that are exposed to the outside world (the
RS-485 pins in this case), the IC is tested in its typical application
configuration (power applied) rather than testing each pin-to-pin
combination. The lower current limiting resistor coupled with the
larger charge storage capacitor yields a test that is much more
severe than the HBM test. The extra ESD protection built into this
device’s RS-485 pins allows the design of equipment meeting
Level 4 criteria without the need for additional board level
protection on the RS-485 port.
AIR-GAP DISCHARGE TEST METHOD
For the air-gap discharge test method, a charged probe tip moves
toward the IC pin until the voltage arcs to it. The current
waveform delivered to the IC pin depends on approach speed,
humidity, temperature, etc. so it is difficult to obtain repeatable
results. The ISL3260xE RS-485 pins withstand ±15kV air-gap
discharges.
CONTACT DISCHARGE TEST METHOD
During the contact discharge test, the probe contacts the tested
pin before the probe tip is energized, and eliminates the
variables associated with the air-gap discharge. The result is a
more repeatable and predictable test, but equipment limits
prevent testing devices at voltages higher than ±8kV. The
ISL3260xE devices survive ±8kV contact discharges on the
RS-485 pins.
Data Rate, Cables, and Terminations
RS-485/422 are intended for network lengths up to 4000ft
(1220m), but the maximum system data rate decreases as the
transmission length increases. The ISL32600E and ISL32601E
operate at data rates up to 128kbps at the maximum (4000ft)
distance, or at data rates of 256kbps for cable lengths less than
3000ft (915m). The ISL32602E and ISL32603E, with VCC =1.8V,
are limited to 1000ft (305m) at 256kbps, or 2000ft (610m) at
128kbps. With VCC = 3.3V, the ISL32602E and ISL32603E
deliver 460kbps over 2000ft, 256kbps over 3000ft, or 128kbps
over 4000ft cables.
Twisted pair is the cable of choice for RS-485 and RS-422
networks. Twisted pair cables tend to pick up noise and other
electromagnetically induced voltages as common-mode signals
that are effectively rejected by the differential receivers in these
ICs.
Short networks using these transceivers need not be terminated,
but terminations are recommended for 2.7V to 3.6V powered
networks unless power dissipation is an overriding concern.
Terminations are not recommended for 1.8V applications due to
the low drive available from those transmitters.
In point-to-point, or point-to-multipoint (single driver on bus)
networks, terminate the main cable in its characteristic
impedance (typically 120Ω) at the end farthest from the driver. In
multi-receiver applications, keep stubs connecting receivers to
the main cable as short as possible. Multipoint (multi-driver)
systems require that the main cable be terminated in its
characteristic impedance at both ends. Keep stubs connecting a
transceiver to the main cable as short as possible.
Terminated networks using the ISL3260xE may require bus
biasing resistors (pull-up on noninverting input, pull-down on
inverting input) to preserve the bus idle state when the bus is not
actively driven. Without bus biasing, the termination resistor
collapses the undriven, differential bus voltage to 0V, which is an
undefined level to the ISL3260xE Rx. Bus biasing forces a few
hundred mV positive differential voltage on the undriven bus,
which all RS-485 and RS-422 Rx interpret as a valid logic high.
Built-In Driver Overload Protection
As stated previously, the RS-485 specification requires that
drivers survive worst case bus contentions undamaged. These
devices meet this requirement using driver output short-circuit
current limits and on-chip thermal shutdown circuitry.
The driver output stages incorporate short-circuit current limiting
circuitry that ensures that the output current never exceeds the
RS-485 specification, even at the common-mode voltage range
extremes. Additionally, these devices use a foldback circuit which
reduces the short-circuit current, and thus the power dissipation,
whenever the contending voltage exceeds either supply.
In the event of a major short-circuit condition, the ISL3260xE’s
thermal shutdown feature disables the drivers whenever the die
temperature becomes excessive. Thermal shutdown eliminates
the power dissipation, allowing the die to cool. The drivers
automatically re-enable after the die temperature drops by about
20°C. If the condition persists, the thermal shutdown/re-enable
cycle repeats until the fault is cleared. Receivers remain
operational during thermal shutdown.
Low Power Shutdown Mode
These micro-power transceivers all use a fraction of the power
required by their counterparts, but they also include a shutdown
feature that reduces the already low quiescent ICC to a 10nA
trickle. These devices enter shutdown whenever the receiver and
driver are simultaneously disabled (RE =V
CC and DE = GND) for a
period of at least 600ns (1200ns at VCC = 1.8V). Disabling both
the driver and the receiver for fewer than 50ns assures that the
transceiver does not enter shutdown.
Note that most receiver and driver enable times increase when the
transceiver enables from shutdown. See Notes 9 through 13 on
page 10 for more information.