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ISL3281EFHZ-T 数据表(PDF) 10 Page - Intersil Corporation

部件名 ISL3281EFHZ-T
功能描述  ±16.5kV ESD Protected, 125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, 20Mbps, Full Fail-safe, Low Power, RS-485/RS-422 Receivers
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL3281EFHZ-T 数据表(HTML) 10 Page - Intersil Corporation

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ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E
10
FN6543.4
July 27, 2015
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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) and 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 this 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 A and B RS-485
pins withstand ±16.5kV air-gap discharges.
CONTACT DISCHARGE TEST METHOD
During the contact discharge test, the probe contacts the tested
pin before the probe tip is energized, thereby eliminating 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 ±9kV. The
ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E
survive ±9kV contact discharges on the RS-485 pins.
Data Rate, Cables and Terminations
RS-485, RS-422 are intended for network lengths up to 4000’,
but the maximum system data rate decreases as the
transmission length increases. Networks operating at 20Mbps
are limited to lengths less than 100’, while a 250kbps network
that uses slew rate limited transmitters can operate at that data
rate over lengths of several thousand feet.
Twisted pair is the cable of choice for RS-485, RS-422 networks.
Twisted pair cables tend to pick up noise and other
electromagnetically induced voltages as common mode signals,
which are effectively rejected by the differential receiver in these
ICs.
To minimize reflections, proper termination is imperative for high
data rate networks. Short networks using slew rate limited
transmitters need not be terminated, but terminations are
recommended unless power dissipation is an overriding concern.
In point-to-point, or point-to-multipoint (single driver on bus)
networks, the main cable should be terminated in its
characteristic impedance (typically 120Ω) at the end farthest
from the driver. In multi receiver applications, stubs connecting
receivers to the main cable should be kept as short as possible.
Multipoint (multi driver) systems require that the main cable be
terminated in its characteristic impedance at both ends. Stubs
connecting a transmitter or receiver to the main cable should be
kept as short as possible.
Low Power Shutdown Mode
These BiCMOS receivers all use a fraction of the power required
by their bipolar counterparts and the versions with output enable
functions include a shutdown feature that reduces the already
low quiescent ICC to a 20µA trickle. These versions enter
shutdown whenever the receiver disables (RE =VCC or
RE = GND).
Typical Performance Curves C
L = 15pF, TA = +25°C; unless otherwise specified.
FIGURE 7. SUPPLY CURRENT vs TEMPERATURE
FIGURE 8. VL SUPPLY CURRENT vs ENABLE PIN VOLTAGE
TEMPERATURE (°C)
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
RE = VCC, RE = 0V
VCC = VL = 5V
VCC = VL = 3.3V
-40
10
60
-15
35
110
85
125
02
4
RE VOLTAGE (V)
13
5
0
50
100
150
200
250
67 7.5
VCC = 5V OR 3.3V
VL = 3.3V
VL = 5V, VCC = 5V ONLY
VL = 2.5V
VL  1.8V


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