diodes to protect the buffer and
LED from a wide range of over-
voltage and over-current
transients. Because threshold
sensing is done prior to driving
the LED, variations in optical
coupling from the LED to the
detector will have no effect on the
threshold levels.
The HCPL-3700's input buffer IC
has a nominal turn on threshold
of 2.5 mA (I
TH
+) and 3.7 volts
(V
TH
+).
The buffer IC for the HCPL-3760
was redesigned to permit a lower
input current. The nominal turn
on threshold for the HCPL-3760
is 1.2 mA (I
TH
+) and 3.7 volts
(V
TH
+).
The high gain output stage
features an open collector output
providing both TTL compatible
saturation voltages and CMOS
compatible breakdown voltages.
By combining several unique
functions in a single package, the
user is provided with an ideal
component for industrial control
computer input boards and other
applications where a predeter-
mined input threshold level is
desirable.
Ordering Information
Specify Part Number followed by Option Number (if desired)
Example
HCPL-3700#XXX
300 = Gull Wing Surface Mount Option
500 = Tape/Reel Package Option (1 K min.)
Option data sheets available. Contact your Hewlett-Packard sales representative or authorized distributor for
information.
Schematic
1-349
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
