HCPL0708 datasheet(9/10 Pages) HP

部件名	HCPL0708

功能描述	High Speed CMOS Optocoupler

Download	10 Pages

Scroll/Zoom	100%

制造商	HP [Agilent(Hewlett-Packard)]

网页	http://www.home.agilent.com

标志

9 / 10 page

9

Figure 9. Propagation delay skew waveform.

Figure 10. Parallel data transmission example.

Propagation delay skew repre-

sents the uncertainty of where an

edge might be after being sent

through an optocoupler.

Figure 10 shows that there will be

uncertainty in both the data and

clock lines. It is important that

these two areas of uncertainty not

overlap, otherwise the clock

signal might arrive before all of

the data outputs have settled, or

some of the data outputs may

start to change before the clock

signal has arrived. From these

considerations, the absolute

minimum pulse width that can be

sent through optocouplers in a

parallel application is twice tPSK.

A cautious design should use a

slightly longer pulse width to

ensure that any additional

uncertainty in the rest of the

circuit does not cause a problem.

The HCPL-0708 optocouplers

offer the advantage of guaranteed

specifications for propagation

delays, pulse-width distortion, and

propagation delay skew over the

recommended temperature and

power supply ranges.

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 transmitted. Typically,

PWD on the order of 20 - 30% of

the minimum pulse width is

tolerable; the exact figure

depends on the particular

application.

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 9, 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 10

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.

50%

tPSK

VI

VO

VI

VO

2.5 V,

CMOS

2.5 V,

CMOS

DATA

INPUTS

CLOCK

DATA

OUTPUTS

CLOCK

tPSK

类似零件编号 - HCPL0708

制造商	部件名	数据表	功能描述
Fairchild Semiconductor	HCPL0700	443Kb / 13P	Low Input Current High Gain Split Darlington Optocouplers
	HCPL0700R2	443Kb / 13P	Low Input Current High Gain Split Darlington Optocouplers
	HCPL0700R2V	443Kb / 13P	Low Input Current High Gain Split Darlington Optocouplers
	HCPL0700V	443Kb / 13P	Low Input Current High Gain Split Darlington Optocouplers
	HCPL0701	443Kb / 13P	Low Input Current High Gain Split Darlington Optocouplers

More results

类似说明 - HCPL0708

制造商	部件名	数据表	功能描述
AVAGO TECHNOLOGIES LIMI...	HCPL-0708-560E	179Kb / 12P	High Speed CMOS Optocoupler
Sensitron	SHD-4134-XXX	85Kb / 4P	High Speed CMOS Optocoupler
AVAGO TECHNOLOGIES LIMI...	HCPL-0738-500E	217Kb / 8P	High Speed CMOS Optocoupler
	HCPL-0738-000E	167Kb / 8P	High Speed CMOS Optocoupler
	HCPL-0738	192Kb / 2P	High Speed CMOS Optocoupler
Agilent(Hewlett-Packard...	HCPL0738	207Kb / 8P	High Speed CMOS Optocoupler
AVAGO TECHNOLOGIES LIMI...	ACPL-772L	313Kb / 11P	3.3V/5V High Speed CMOS Optocoupler
AVAGO TECHNOLOGIES LIMI...	ACPL-072L-560E	313Kb / 11P	3.3V/5V High Speed CMOS Optocoupler
Siemens Semiconductor G...	SFH6315	69Kb / 4P	HIGH SPEED OPTOCOUPLER
Siemens Semiconductor G...	SFH6315T	48Kb / 4P	HIGH SPEED OPTOCOUPLER