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ISO150 参数 Datasheet PDF下载

ISO150图片预览
型号: ISO150
PDF下载: 下载PDF文件 查看货源
内容描述: 双路,隔离,双向数字耦合器 [Dual, Isolated, Bi-Directional DIGITAL COUPLER]
分类和应用:
文件页数/大小: 9 页 / 159 K
品牌: BB [ BURR-BROWN CORPORATION ]
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LOGIC LEVELS  
PROPAGATION DELAY AND SKEW  
A single pin serves as a data input or output, depending on  
the mode selected. Logic inputs are CMOS with thresholds  
set for TTL compatibility. The logic threshold is approxi-  
mately 1.3V with 5V supplies and with approximately 400mV  
of hysteresis. Input logic thresholds vary with the power  
supply voltage. Drive the logic inputs with signals that swing  
the full logic voltage swing. The ISO150 will use somewhat  
greater quiescent current if logic inputs do not swing within  
0.5V of the power supply rails.  
Logic transitions are delayed approximately 27ns through  
the ISO150. Some applications are sensitive to data skew—  
the difference in propagation delay between channel 1 and  
channel 2. Skew is less than 2ns between channel 1 and  
channel 2. Applications using more than one ISO150 must  
allow for somewhat greater skew from device to device.  
Since all devices are tested for delay times of 20ns min to  
40ns max, 20ns is the largest device-to-device data skew.  
MODE CHANGES  
In receive mode, the data output can drive 15 standard  
LS-TTL loads. It will also drive CMOS loads. The output  
drive circuits are CMOS.  
The transmission direction of a channel can be changed “on  
the fly” by reversing the logic levels at the channel’s R/T  
pins on both side A and side B. Approximately 75ns after the  
transceiver is programmed to receive mode its output is  
initialized “high”, and will respond to subsequent input-side  
changes in data.  
POWER SUPPLY  
Separate, isolated power supplies must be connected to side  
A and side B to provide galvanic isolation. Nominal rated  
supply voltage is 5V. Operation extends from 3V to 5.5V.  
Power supplies should be bypassed close to the device pins  
on both sides of the isolation barrier.  
STANDBY MODE  
Quiescent current of each transceiver circuit is very low in  
transmit mode when input data is not changing (1nA typi-  
cal). To conserve power when data transmission is not  
required, program both side A and B transceivers for trans-  
mit mode. Input data applied to either transceiver is ignored  
by the other side. High speed data applied to either trans-  
ceiver will increase quiescent current.  
The VS pin for each side powers the transceivers for both  
channel 1 and 2. The specified supply current is the total of  
both transceivers on one side, both operating in the indicated  
mode. Supply current for one transceiver in transmit mode  
and one in receive mode can be estimated by averaging the  
specifications for transmit and receive operation. Supply  
current varies with the data transmission rate—see typical  
curves.  
CIRCUIT LAYOUT  
The high speed of the ISO150 and its isolation barrier  
require careful circuit layout. Use good high speed logic  
layout techniques for the input and output data lines. Power  
supplies should be bypassed close to the device pins on both  
sides of the isolation barrier. Use low inductance connec-  
tions. Ground planes are recommended.  
POWER-UP STATE  
The ISO150 transmits information across the barrier only  
when the input-side data changes logic state. When a trans-  
ceiver is first programmed for receive mode, or is powered-  
up in receive mode, its output is initialized “high”. Subse-  
quent changes of data applied to the input side will cause the  
output to properly reflect the input side data.  
Maintain spacing between side 1 and side 2 circuitry equal  
or greater than the spacing between the missing pins of the  
ISO150 (approximately 16mm for the DIP version). Sockets  
are not recommended.  
SIGNAL LOSS  
The ISO150’s differential-mode signal transmission and  
careful receiver design make it highly immune to voltage  
across the isolation barrier (isolation-mode voltage). Rapidly  
changing isolation-mode voltage can cause data errors. As  
the rate of change of isolation voltage is increased, there is  
a very sudden increase in data errors. Approximately 50% of  
ISO150s will begin to produce data errors with isolation-  
mode transients of 1.6kV/µs. This may occur as low as  
500V/µs in some devices. In comparison, a 1000Vrms, 60Hz  
isolation-mode voltage has a rate of change of approximately  
0.5V/µs.  
Still, some applications with large, noisy isolation-mode  
voltage can produce data errors by causing the receiver  
output to change states. After a data error, subsequent changes  
in input data will produce correct output data.  
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ISO150  
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