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PDF ISL3282EMRTEP Data sheet ( Hoja de datos )
| Número de pieza | ISL3282EMRTEP | |
| Descripción | RS-485/422 Receiver | |
| Fabricantes | Intersil | |
| Logotipo |  |
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DATASHEET
±16.5kV ESD Protected, 16Mbps, with Active Low Rx
EN, RS-485/422 Receiver
ISL3282EMRTEP
The Intersil ISL3282EMRTEP is a ±16.5kV IEC61000 ESD
protected, 3.0V to 5.5V powered, single receiver that meets
both the RS-485 and RS-422 standards for balanced
communication. This receiver has very low bus currents
(+125µA/-100µA), so it presents a true “1/8 unit load” to the
RS-485 bus. This allows up to 256 receivers on the network
without violating the RS-485 specification’s 32 unit load
maximum and without using repeaters.
Receiver inputs feature a “Full Fail-Safe” design, which ensures
a logic high Rx output if Rx inputs are floating, shorted, or
terminated but undriven.
The ISL3282EMRTEP includes an active low enable pin and is
offered in the Military Temperature range (-55°C to +125°C).
A 26% smaller footprint is available with the TDFN package.
This device also features a logic supply pin (VL) that sets the
VOH level of the RO output (and the switching points of the
RE/RE input) to be compatible with another supply voltage in
mixed voltage systems.
Device Information
The specifications for an Enhanced Product (EP) device are
defined in a Vendor Item Drawing (VID), which is controlled by
the Defense Supply Center in Columbus (DSCC). “Hot-links” to
the applicable VID and other supporting application
information are provided on our website.
Applications
• Clock distribution
• High node count systems
• Space constrained systems
• Security camera networks
• Building environmental control/lighting systems
• Industrial/process control networks
Features
• Specifications per DSCC VID V62/10601-01XB
• Full military temperature electrical performance from
-55°C to +125°C
• Controlled baseline with one wafer fabrication site and one
assembly/test site
• Full homogeneous lot processing in wafer fab
• No combination of wafer fabrication lots in assembly
• Full traceability through assembly and test by date/trace
code assignment
• Enhanced process change notification
• Enhanced obsolescence management
• Eliminates need for up-screening a COTS component
• ±16.5kV IEC61000 ESD protection on RS-485 inputs
• Class 3 ESD level on all other pins. . . . . . . . . . . . . .>5kV HBM
• Wide supply range . . . . . . . . . . . . . . . . . . . . . . . . . 3.0V to 5.5V
• Specified for +125°C operation
• Logic supply pin (VL) eases operation in mixed supply
systems
• Full fail-safe (open, short, terminated/undriven)
• True 1/8 unit load allows up to 256 devices on the bus
• High data rates. . . . . . . . . . . . . . . . . . . . . . . . . . up to 16Mbps
• Low quiescent supply current. . . . . . . . . . 500µA (maximum)
• Very low shutdown supply current . . . . . . . 20µA (maximum)
• -7V to +12V common-mode input voltage range
• Tri-statable Rx available (active low or high EN input)
• 5V tolerant logic inputs when VCC 5V
PART NUMBER
ISL3282EMRTEP
FUNCTION
1 Rx
DATA RATE
(Mbps)
16
TABLE 1. SUMMARY OF FEATURES
# DEVICES ON
BUS
256
RX
ENABLE?
ACTIVE LOW
VL PIN?
YES
QUIESCENT ICC
(µA)
350
LOW POWER
SHUTDOWN?
YES
LEAD
COUNT
8-TDFN
June 17, 2016
FN7595.2
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2010, 2011, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL3282EMRTEP
protection eliminates the need for board level protection
structures (e.g., 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) 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, however, equipment limits
prevent testing devices at voltages higher than ±9kV. The
ISL3282EMRTEP can 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’,
however, the maximum system data rate decreases as the
transmission length increases. Networks operating at 16Mbps
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, however, 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 multireceiver applications, stubs connecting
receivers to the main cable should be kept as short as possible.
Multipoint (multidriver) 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
This BiCMOS receiver uses a fraction of the power required by its
bipolar counterparts, and include a shutdown feature that
reduces the already low quiescent ICC to a 20µA trickle. They
enter shutdown whenever the receiver is disabled (RE = VCC).
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5
FN7595.2
June 17, 2016
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ISL3282EMRTEP.PDF ] | |
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