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ISL3150EIBZ データシート(PDF) 11 Page - Intersil Corporation

部品番号 ISL3150EIBZ
部品情報  짹16.5kV ESD (IEC61000-4-2) Protected, Large Output Swing, 5V, Full Fail-Safe, 1/8 Unit Load, RS-485/RS-422 Transceivers
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL3150EIBZ データシート(HTML) 11 Page - Intersil Corporation

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11
FN6363.1
January 18, 2008
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards used for long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
transceivers are also RS-422 compliant. RS-422 is a
point-to-multipoint (multidrop) standard, which allows only
one driver and up to 10 (assuming one unit load devices)
receivers on each bus. RS-485 is a true multipoint standard,
which allows up to 32 one unit load devices (any
combination of drivers and receivers) on each bus. To allow
for multipoint operation, the RS-485 specification requires
that drivers must handle bus contention without sustaining
any damage.
Another important advantage of RS-485 is the extended
common mode range (CMR), which specifies that the driver
outputs and receiver inputs withstand signals that range from
+12V to -7V. RS-422 and RS-485 are intended for runs as
long as 4000’, so the wide CMR is necessary to handle
ground potential differences, as well as voltages induced in
the cable by external fields.
Receiver (Rx) Features
These devices utilize a differential input receiver for maximum
noise immunity and common mode rejection. Input sensitivity
is better than
±200mV, as required by the RS-422 and RS-485
specifications.
Rx outputs feature high drive levels (typically 28mA @
VOL = 1V to ease the design of optically coupled isolated
interfaces).
Receiver input resistance of 96k
Ω surpasses the RS-422
specification of 4k
Ω, and is eight times the RS-485 “Unit
Load (UL)” requirement of 12k
Ω minimum. Thus, these
products are known as “one-eighth UL” transceivers, and
there can be up to 256 of these devices on a network while
still complying with the RS-485 loading specification.
Rx inputs function with common mode voltages as great as
±7V outside the power supplies (i.e., +12V and -7V), making
them ideal for long networks where induced voltages are a
realistic concern.
All the receivers include a “full fail-safe” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating), shorted together, or connected to
a terminated bus with all the transmitters disabled.
Receivers easily meet the data rates supported by the
corresponding driver, and all receiver outputs are
three-statable via the active low RE input.
Driver (Tx) Features
The RS-485/RS-422 driver is a differential output device that
delivers at least 2.4V across a 54
Ω load (RS-485), and at
least 2.8V across a 100
Ω load (RS-422). The drivers feature
low propagation delay skew to maximize bit width, and to
minimize EMI, and all drivers are three-statable via the
active high DE input.
The 115kbps and 1Mbps driver outputs are slew rate limited
to minimize EMI, and to minimize reflections in unterminated
or improperly terminated networks. Outputs of the
ISL3156Eand ISL3158E drivers are not limited, so faster
output transition times allow data rates of at least 20Mbps
High VOD Improves Noise Immunity and Flexibility
The ISL315xE driver design delivers larger differential output
voltages (VOD) than the RS-485 standard requires, or than
most RS-485 transmitters can deliver. The minimum ±2.4V
VOD guarantees at least ±900mV more noise immunity than
networks built using standard 1.5V VOD transmitters.
Another advantage of the large VOD is the ability to drive
more than two bus terminations, which allows for utilizing the
ISL315xE in “star” and other multi-terminated,
“non-standard” network topologies. Figure 8, details the
transmitter’s VOD vs IOUT characteristic, and includes load
lines for six (20
Ω) and eight (15Ω) 120Ω terminations. The
figure shows that the driver typically delivers 1.65/1.5V into
6/8 terminations, even at the worst case temperature of
+85°C.The RS-485 standard requires a minimum 1.5V VOD
into two terminations, but the ISL315xE delivers RS-485
voltage levels with 3x to 4x the number of terminations.
Hot Plug Function
When a piece of equipment powers up, there is a period of
time where the processor or ASIC driving the RS-485 control
lines (DE, RE) is unable to ensure that the RS-485 Tx and
Rx outputs are kept disabled. If the equipment is connected
to the bus, a driver activating prematurely during power-up
may crash the bus. To avoid this scenario, the ISL315xE
devices incorporate a “Hot Plug” function. Circuitry monitoring
VCC ensures that, during power-up and power-down, the Tx
and Rx outputs remain disabled, regardless of the state of DE
and RE, if VCC is less than ~3.4V. This gives the
processor/ASIC a chance to stabilize and drive the RS-485
control lines to the proper states.
FIGURE 7. HOT PLUG PERFORMANCE (ISL315xE) vs
ISL83088E WITHOUT HOT PLUG CIRCUITRY
TIME (40µs/DIV)
VCC
2.5
5.0
2.5
5.0
RL = 1kΩ
RO
0
2.5
5.0
0
0
A
/Y
RL = 1kΩ
3.3V
3.5V
ISL315xE
ISL315xE
RE = GND
DE, DI = VCC
ISL3150E, ISL3152E, ISL3153E, ISL3155E, ISL3156E, ISL3158E


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