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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

(V

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

(V

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