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ISL3285EFRTZ-T датащи(PDF) 8 Page - Integrated Device Technology

номер детали ISL3285EFRTZ-T
подробное описание детали  짹16.5kV ESD Protected, 125째C, 3.0V to 5.5V, SOT-23/TDFN Packaged, 20Mbps, Full Fail-safe, Low Power, RS-485/RS-422 Receivers
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производитель  IDT [Integrated Device Technology]
домашняя страница  http://www.idt.com
Logo IDT - Integrated Device Technology

ISL3285EFRTZ-T датащи(HTML) 8 Page - Integrated Device Technology

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FN6543.2
October 18, 2007
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in 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.
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 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.
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.
Receiver inputs function with common mode voltages as great
as +9V/-7V outside the power supplies (i.e., +12V and -7V),
making them ideal for long networks where induced voltages,
and ground potential differences are realistic concerns.
Test Circuits and Waveforms
FIGURE 1A. TEST CIRCUIT
FIGURE 1B. MEASUREMENT POINTS
FIGURE 1. RECEIVER PROPAGATION DELAY AND DATA RATE
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. RECEIVER ENABLE AND DISABLE TIMES (EXCEPT ISL3280E AND ISL3284E)
SIGNAL
GENERATORS
R
RO
RE
A
B
GND
15pF
RE
VCC
RO
+1V
-1V
tPLH
0V
0V
VCC OR VL
0V
50%
50%
tPHL
A
B
1k
Ω
VCC OR VL
GND
SW
PARAMETER
A
SW
tHZ
+1.5V
GND
tLZ
-1.5V
VCC OR VL
tZH
+1.5V
GND
tZL
-1.5V
VCC OR VL
SIGNAL
GENERATOR
R
RO
RE OR RE
A
B
GND
15pF
RO
3V
0V
1.5V
1.5V
VOH
0V
50%
VOH - 0.25V
tHZ
RO
VCC OR VL
VOL
50%
VOL + 0.25V
tLZ
RE
OUTPUT HIGH
OUTPUT LOW
tZL
tZH
(INVERT FOR RE)
ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E


Аналогичный номер детали - ISL3285EFRTZ-T

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Аналогичное описание - ISL3285EFRTZ-T

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