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ISL83088EIBZ-T 参数 Datasheet PDF下载

ISL83088EIBZ-T图片预览
型号: ISL83088EIBZ-T
PDF下载: 下载PDF文件 查看货源
内容描述: + -15kV的ESD保护, 5V,全故障保护,分数( 1/8 )机组负荷, RS - 485 / RS -422收发器 [+-15kV ESD Protected, 5V, Full Fail-Safe, Fractional (1/8) Unit Load, RS-485/RS-422 Transceivers]
分类和应用:
文件页数/大小: 18 页 / 828 K
品牌: INTERSIL [ Intersil ]
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ISL83080E, ISL83082E, ISL83083E, ISL83085E, ISL83086E, ISL83088E  
Test Circuits and Waveforms (Continued)  
+1.5V  
-1.5V  
RE  
15pF  
A
0V  
0V  
B
0V  
RO  
R
A
t
t
PHL  
PLH  
V
CC  
SIGNAL  
GENERATOR  
1.5V  
1.5V  
RO  
0V  
FIGURE 5A. TEST CIRCUIT  
FIGURE 5B. MEASUREMENT POINTS  
FIGURE 5. RECEIVER PROPAGATION DELAY AND DATA RATE  
RE  
NOTE 9  
B
A
3V  
0V  
1kΩ  
V
GND  
CC  
RO  
RE  
R
1.5V  
1.5V  
HZ  
GND  
SW  
SIGNAL  
15pF  
GENERATOR  
t
, t  
ZH ZH(SHDN)  
t
NOTE 9  
OUTPUT HIGH  
1.5V  
V
OH  
V
- 0.5V  
OH  
PARAMETER  
DE  
0
A
SW  
RO  
0V  
t
+1.5V  
-1.5V  
+1.5V  
-1.5V  
+1.5V  
-1.5V  
GND  
HZ  
t
, t  
t
0
V
ZL ZL(SHDN)  
t
LZ  
LZ  
CC  
NOTE 9  
V
CC  
t
(Note 8)  
(Note 8)  
0
GND  
ZH  
RO  
1.5V  
t
0
V
ZL  
CC  
V
+ 0.5V  
OL  
V
OL  
OUTPUT LOW  
t
(Note 11)  
(Note 11)  
0
GND  
ZH(SHDN)  
t
0
V
CC  
ZL(SHDN)  
FIGURE 6A. TEST CIRCUIT  
FIGURE 6B. MEASUREMENT POINTS  
FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES  
Receiver Features  
Application Information  
These devices utilize a differential input receiver for maximum  
noise immunity and common mode rejection. Input sensitivity  
is ±200mV, as required by the RS-422 and RS-485  
specifications.  
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.  
Receiver input resistance of 96ksurpasses the RS-422  
spec of 4k, and is eight times the RS-485 “Unit Load (UL)”  
requirement of 12kminimum. Thus, these products are  
known as “one-eighth ULtransceivers, and there can be up  
to 256 of these devices on a network while still complying  
with the RS-485 loading spec.  
Receiver 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.  
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.  
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.  
FN6085.6  
10  
September 12, 2005  
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