HCPL-0710500 datasheet(8/16 Pages) HP

Teilenummer	HCPL-0710500

Bauteilbeschribung	40 ns Prop. Delay, SO-8 Optocoupler

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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 propaga-

tion 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 propagate to the

output, causing the output to

change from high to low. See

Figure 13.

Pulse-width distortion (PWD) is

the difference between tPHL and

tPLH and often determines the

maximum 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 trans-

mitted. Typically, PWD on the

order of 20 - 30% of the minimum

pulse width is tolerable. The PWD

specification for the HCPL-0710

is 8 ns (10%) maximum across

recommended operating condi-

tions. 10% maximum is dictated

by the most stringent of the three

fieldbus standards, PROFIBUS.

Propagation delay skew, tPSK, is

an important parameter to con-

sider in parallel data applications

where synchronization of signals

on parallel data lines is a concern.

If the parallel data is being sent

through a group of optocouplers,

differences in propagation delays

will cause the data to arrive at the

outputs of the optocouplers at

different times. If this difference

in propagation delay is large

enough it will determine the

maximum rate at which parallel

data can be sent through the

optocouplers.

Propagation delay skew is defined

as the difference between the

minimum and maximum propa-

gation delays, either tPLH or tPHL,

for any given group of optocoup-

lers which are operating under

the same conditions (i.e., the

same drive current, supply volt-

age, output load, and operating

temperature). As illustrated in

Figure 14, if the inputs of a group

of optocouplers are switched

either ON or OFF at the same

time, tPSK is the difference

between the shortest propagation

delay, either tPLH or tPHL, and the

longest propagation delay, either

tPLH or tPHL.

As mentioned earlier, tPSK can

determine the maximum parallel

data transmission rate. Figure 15

is the timing diagram of a typical

parallel data application with both

the clock and data lines being

sent through the optocouplers.

The figure shows data and clock

signals at the inputs and outputs

of the optocouplers. In this case

the data is assumed to be clocked

off of the rising edge of the clock.

INPUT

tPLH

tPHL

OUTPUT

VI

VO

10%

90%

10%

VOH

VOL

0 V

50%

5 V CMOS

2.5 V CMOS

Ähnliche Beschreibung - HCPL-0710500

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
Agilent(Hewlett-Packard...	HCPL0710	130Kb / 2P	40 ns Prop. Delay, SO-8 Optocoupler
Broadcom Corporation.	HCPL-0720	903Kb / 21P	40-ns Propagation Delay, CMOS Optocoupler
AVAGO TECHNOLOGIES LIMI...	HCPL-0720-500E	292Kb / 18P	40 ns Propagation Delay, CMOS Optocoupler
Agilent(Hewlett-Packard...	HCPL-7710	454Kb / 18P	40 ns Propagation Delay, CMOS Optocoupler
AVAGO TECHNOLOGIES LIMI...	HCPL-7721-520	292Kb / 18P	40 ns Propagation Delay, CMOS Optocoupler
	HCPL-7721-000E	306Kb / 18P	40 ns Propagation Delay, CMOS Optocoupler
	HCPL-7720	292Kb / 18P	40 ns Propagation Delay, CMOS Optocoupler
	HCPL-7710-000E	305Kb / 18P	40 ns Propagation Delay, CMOS Optocoupler
Agilent(Hewlett-Packard...	HCPL-7720	305Kb / 18P	40 ns Propagation Delay CMOS Optocoupler
AVAGO TECHNOLOGIES LIMI...	HCPL-7710	332Kb / 17P	40 ns Propagation Delay, CMOS Optocoupler 8 ns maximum pulse width distortion

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