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HCPL-2500E Datasheet(PDF) 10 Page - AVAGO TECHNOLOGIES LIMITED

Part # HCPL-2500E
Description  8 MBd Low Input Current Optocoupler
Download  14 Pages
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Manufacturer  AVAGO [AVAGO TECHNOLOGIES LIMITED]
Direct Link  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

HCPL-2500E Datasheet(HTML) 10 Page - AVAGO TECHNOLOGIES LIMITED

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10
Applications
The HCPL-2300/HCPL-0300 optocoupler has the unique
combinationoflow0.5mALEDoperatingdrivecurrentata
5 MBd speed performance. Low power supply current
requirement of 10 mA maximum at 5.25V and the abil-
ity to provide isolation between logic systems fulfills
numerous applications ranging from logic level transla-
tions, line receiver and party line receiver applications,
microprocessor I/O port isolation, etc. The open collector
output allows for wired-OR arrangement. Specific inter-
face circuits are illustrated in Figures 12-16, and 18 with
corresponding component values, performance data
and recommended layout in Figures 17 and 19.
For -40°C to 85°C operating temperature range, a mid-
range LED forward current (I
F) of 0.625 mA is recommend-
ed in order to prevent overdriving the integrated circuit
detector due to increased LED efficiency at temperatures
between 0°C and -40°C. For narrower temperature range
of 0°C to 85°C, a suggested operating LED current of
0.75 mA is recommended for the mid-range operating
point and for minimal propagation delay skew.
A peaking capacitance of 20 pF in parallel with the cur-
rent limiting resistor for the LED shortens t
PHL by approxi-
mately 33% and t
PLH by 13%. Maintaining LED forward
voltage (V
F) below 0.8 V will guarantee that the HCPL-
2300/HCPL-0300 output is off.
The recommended shunt drive technique for TTL/LSTTL/
CMOS of Figure 12 provides for optimal speed perfor-
mance, no leakage current path through the LED, and re-
duced common mode influences associated with series
switching of a “floating” LED. Alternate series drive tech-
niques with either an active CMOS inverter or an open
collector TTL/LSTTL inverter are illustrated in Figures 13
and 14 respectively. Open collector leakage current of
250 µA has been compensated by the 3.16 KΩ resistor
(Figure 14) at the expense of twice the operating forward
current.
An application of the HCPL-2300/HCPL-0300 as an un-
balanced line receiver for use in long line twisted wire
pair communication links is shown in Figure 15. Low
LED I
F and VF allow longer line length, higher speed
and multiple stations on the line in comparison to
higher I
F, VF optocouplers. Greater speed performance
along with nearly infinite common mode immu-
nity are achieved via the balanced split phase circuit
of Figure 16. Basic balanced differential line re-
ceiver can be accomplished with one HCPL-
2300/HCPL-0300 in Figure 16, but with a typical
400 V/µs common mode immunity. Data rate versus dis-
tance for both the above unbalanced and balanced line
receiver applications are compared in Figure 17. The RS-
232-C interface circuit of Figure 18 provides guaranteed
minimum common mode immunity of 100V/µs while
maintaining the 2:1 dynamic range of I
F.
Figure 10. Test circuit for common mode transient immunity and typical waveforms.
HCPL-0300/
HCPL-2300


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