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ISL32603EFBZ Folha de dados(PDF) 11 Page - Intersil Corporation

Nome de Peças ISL32603EFBZ
Descrição Electrónicos  1.8V to 3.3V, Micro-Power, 짹15kV ESD, 125째C, Slew Rate Limited, RS-485/RS-422 Transceivers
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Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL32603EFBZ Folha de dados(HTML) 11 Page - Intersil Corporation

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ISL32600E, ISL32601E, ISL32602E, ISL32603E
11
FN7967.0
June 22, 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
-7V to +12V. 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. The symmetrical ±200mV switching thresholds
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. DRIVER DATA RATE
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RECEIVER PROPAGATION DELAY AND DATA RATE
FIGURE 8A. TEST CIRCUIT
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES
Test Circuits and Waveforms (Continued)
D
DE
DI
VCC
SIGNAL
GENERATOR
Z
Y
50pF
VOD
-
+
RDIFF
VCC
0V
DIFF OUT (Y - Z)
+VOD
-VOD
DI
0V
SIGNAL
GENERATOR
R
RO
RE
A
B
GND
15pF
RO
+1V
-1V
tPLH
0V
0V
VCC
0V
50%
50%
tPHL
A
1k
VCC
GND
SW
PARAMETER
DE
A
SW
tHZ
X
+1.5V
GND
tLZ
X
-1.5V
VCC
tZH (Note 10)
0
+1.5V
GND
tZL (Note 10)
0
-1.5V
VCC
tZH(SHDN) (Note 13)
0
+1.5V
GND
tZL(SHDN) (Note 11)
0
-1.5V
VCC
SIGNAL
GENERATOR
R
RO
RE
A
B
GND
15pF
RO
VCC
0V
50%
50%
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 11
NOTE 11
NOTE 11


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