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ISL3177EIUZ датащи(PDF) 10 Page - Intersil Corporation

номер детали ISL3177EIUZ
подробное описание детали  ±15kV ESD Protected, 3.3V, Full Fail-Safe, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
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производитель  INTERSIL [Intersil Corporation]
домашняя страница  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL3177EIUZ датащи(HTML) 10 Page - Intersil Corporation

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10
FN6307.5
June 8, 2012
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. To allow
for multipoint operation, the RS-485 spec 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 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
spec 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.
All the receivers include a “Full Fail-Safe” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating) or shorted. Fail-safe with shorted
inputs is achieved by setting the Rx upper switching point to
-50mV, thereby ensuring that the Rx sees 0V differential as a
high input level.
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER PROPAGATION DELAY
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES (EXCEPT ISL3171E, ISL3174E, ISL3177E)
Test Circuits and Waveforms (Continued)
SIGNAL
GENERATOR
R
RO
RE
A
B
GND
15pF
RO
+1.5V
-1.5V
tPLH
0V
0V
VCC
0V
1.5V
1.5V
tPHL
A
1k
Ω
VCC
GND
SW
PARAMETER
DE
A
SW
tHZ
X
+1.5V
GND
tLZ
X
-1.5V
VCC
tZH (Note 9)
0
+1.5V
GND
tZL (Note 9)
0
-1.5V
VCC
tZH(SHDN) (Note 12)
0
+1.5V
GND
tZL(SHDN) (Note 12)
0
-1.5V
VCC
SIGNAL
GENERATOR
R
RO
RE
A
B
GND
15pF
RO
3V
0V
1.5V
1.5V
VOH
0V
1.5V
VOH - 0.25V
tHZ
RO
VCC
VOL
1.5V
VOL + 0.25V
tLZ
RE
OUTPUT HIGH
OUTPUT LOW
tZL, tZL(SHDN)
tZH, tZH(SHDN)
NOTE 10
NOTE 10
NOTE 10
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E,ISL3176E, ISL3177E, ISL3178E


Аналогичный номер детали - ISL3177EIUZ

производительномер деталидатащиподробное описание детали
logo
Intersil Corporation
ISL3177EIUZ INTERSIL-ISL3177EIUZ Datasheet
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Renesas Technology Corp
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Аналогичное описание - ISL3177EIUZ

производительномер деталидатащиподробное описание детали
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