ACPL-W70L-500E 데이터 시트보기 (PDF) - Avago Technologies

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ACPL-W70L-500E

Single-channel and Dual-channel High Speed 15 MBd CMOS optocoupler with Glitch-Free Power-Up Feature

Avago Technologies 

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Figure 7. Typical VF vs. temperature.

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Application Information

Bypassing and PC Board Layout

The ACPL-W70L and ACPL-K73L optocouplers are ex-

tremely easy to use. ACPL-W70L and ACPL-K73L provide

CMOS logic output due to the high-speed CMOS IC tech-

nology used.

The external components required for proper operation

are the input limiting resistor and the output bypass ca-

pacitor. Capacitor values should be between 0.01 µF and

0.1 µF.

For each capacitor, the total lead length between both

ends of the capacitor and the power-supply pins should

not exceed 20 mm.

Propagation Delay, Pulse-Width Distortion and Propagation Delay

Skew

Propagation delay is a figure of merit which describes how

quickly a logic signal propagates through a system. The

propagation delay from low to high (tPLH) is the amount

of time required for an input signal to propagate to the

output, causing the output to change from low to high.

Similarly, the propagation delay from high to low (tPHL) is

the amount of time required for the input signal to propa-

gate to the output, causing the output to change from

high to low (see Figure 9).

Pulse-width distortion (PWD) results when tPLH and tPHL

differ in value. PWD is defined as the difference between

tPLH and tPHL and often PWD is defined as the difference

between tPLH and tPHL and often determines the maxi-

mum data rate capability of a transmission system. PWD

can be expressed in percent by dividing the PWD (in ns)

by the minimum pulse width (in ns) being transmitted.

Typically, PWD on the order of 20-30% of the minimum

pulse width is tolerable; the exact figure depends on the

particular application (RS232, RS422, T-1, etc.).

Propagation delay skew, tPSK, is an important parameter

to consider in parallel data applications where synchroni-

zation of signals on parallel data lines is a concern.

If the parallel data is being sent through a group of opto-

couplers, differences in propagation delays will cause the

data to arrive at the outputs of the optocouplers at differ-

ent times. If this difference in propagation delays is large

enough, it will determine the maximum rate at which par-

allel data can be sent through the optocouplers.

Propagation delay skew is defined as the difference be-

tween the minimum and maximum propagation delays,

either tPLH or tPHL, for any given group of optocouplers

which are operating under the same conditions (i.e., the

same supply voltage, output load, and operating temper-

ature). As illustrated in Figure 10, if the inputs of a group of

optocouplers are switched either ON or OFF at the same

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