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ISL32492EIBZ 데이터시트(PDF) 11 Page - Intersil Corporation

부품명 ISL32492EIBZ
상세설명  짹60V Fault Protected, 5V, RS-485/RS-422 Transceivers with 짹25V CMR and ESD Protection
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제조업체  INTERSIL [Intersil Corporation]
홈페이지  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL32492EIBZ 데이터시트(HTML) 11 Page - Intersil Corporation

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ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, ISL32498E
11
FN7786.2
March 16, 2012
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 feet; thus, the wide CMR is necessary to handle ground
potential differences, as well as voltages induced in the cable by
external fields.
The ISL3249xE is a family of ruggedized RS-485 transceivers
that improves on the RS-485 basic requirements and thereby
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
CD
VOD
+
-
54Ω
3V
0V
DIFF OUT (Y - Z)
+VOD
-VOD
DI
0V
SIGNAL
GENERATOR
R
RO
RE
A
B
15pF
SIGNAL
GENERATOR
VCM
RO
VCM + 750mV
VCM - 750mV
tPLH
VCM
VCM
VCC
0V
50%
50%
tPHL
A
B
1kΩ
VCC
GND
SW
PARAMETER
DE
A
SW
tHZ
0
+1.5V
GND
tLZ
0
-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 13)
0
-1.5V
VCC
SIGNAL
GENERATOR
R
RO
RE
A
B
15pF
RO
3V
0V
1.5V
1.5V
VOH
0V
1.5V
VOH - 0.5V
tHZ
RO
VCC
VOL
1.5V
VOL + 0.5V
tLZ
RE
OUTPUT LOW
tZL, tZL(SHDN)
tZH, tZH(SHDN)
(Note 11)
(Note 11)
(Note 11)
OUTPUT HIGH


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