HCPL-4100 datasheet(7/12 Pages) HP

Part #	HCPL-4100

Description	Optically Coupled 20 mA Current Loop Transmitter

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Manufacturer	HP [Agilent(Hewlett-Packard)]

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7

Notes:

1. Derate linearly above 55

°C free air

temperature at a rate of 3.8 mW/

°C.

Proper application of the derating

factors will prevent IC junction

temperatures from exceeding 125

°C

for ambient temperatures up to 85

°C.

2. Derate linearly above a free-air

temperature of 70

°C at a rate of 2.3

mW/

°C. A significant amount of

power may be dissipated in the

HCPL-4100 output circuit during the

transition from the SPACE state to

the MARK state when driving a data

line or capacitive load (C OUT). The

average power dissipation during the

transition can be estimated from the

following equation which assumes a

linear discharge of a capacitive load:

P = ISC (VSO + VMO)/2, where VSO is

the output voltage in the SPACE

state. The duration of this transition

can be estimated as t = C OUT (VSO -

VMO)/ISC. For typical applications

driving twisted pair data lines with

NRZ data as shown in Figure 11, the

transition time will be less than 10%

of one bit time.

3. Derate linearly above 55

°C free-air

temperature at a rate of 5.1 mW/

°C.

4. The maximum current that will flow

into the output in the mark state (I SC)

is internally limited to protect the

device. The duration of the output

short circuit shall not exceed 10 ms.

5. The device is considered a two

terminal device, pins 1, 2, 3, and 4

are connected together, and pins 5,

6, 7, and 8 are connected together.

6. The t PLH propagation delay is

measured from the 1.3 volt level on

the leading edge of the input pulse to

the 10 mA level on the leading edge

of the output pulse.

7. The t PHL propagation delay is

measured from the 1.3 volt level on

the trailing edge of the input pulse to

the 10 mA level on the trailing edge

of the output pulse.

8. The rise time, t r, is measured from the

10% to the 90% level on the rising

edge of the output current pulse.

9. The fall time, t f, is measured from the

90% to the 10% level on the falling

edge of the output current pulse.

10. Common mode transient immunity in

the logic high level is the maximum

(positive) dVCM/dt on the leading

edge of the common mode pulse,

VCM, that can be sustained with the

output in a Mark ("H") state (i.e.,

IO > 12 mA).

11. Common mode transient immunity in

the logic low level is the maximum

(positive) dVCM/dt on the leading

edge of the common mode pulse,

VCM, that can be sustained with the

output in a Space ("L") state (i.e., IO

< 3 mA).

12. Use of a 0.1

µF bypass capacitor

connected between pins 5 and 8 is

recommended.

13. In accordance with UL 1577, each

optocoupler is momentary withstand

proof tested by applying an insulation

test voltage

≥ 3000 V rms for 1

second (leakage detection current

limit, Ii-o ≤ 5 µA).

Figure 2. Typical Mark State Output

Voltage vs. Temperature.

Figure 3. Typical Output Voltage vs.

Loop Current.

Figure 4. Typical Space State Output

Current vs. Temperature.

-40

1.6

1.2

TA – TEMPERATURE – °C

060

1.8

1.4

-20

20

40

2.0

2.2

2.4

2.6

2.8

3.0

80

100

IO

20 mA

12 mA

2 mA

VCC = 5 V

VI = 2 V

0

1.0

0

IO – OUTPUT CURRENT – mA

10

20

1.5

0.5

515

2.0

2.5

3.0

3.5

25

30

VCC = 5 V

VI = 2 V

TA = 25 °C

-40

0.8

0.6

TA – TEMPERATURE – °C

060

0.9

0.7

-20

20

40

1.0

1.1

1.2

1.3

80

100

VO

27 V

20 V

VCC = 5 V

VI = 0.8 V

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HCPL-4100 Datasheet(PDF) 7 Page - Agilent(Hewlett-Packard)

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