tm
HCPL-3700 A
C/DC to Logic Interface Optocoupler
April 2007
©2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
HCPL-3700 Rev. 1.0.1
HCPL-3700
AC/DC to Logic Interface Optocoupler
Features
■
AC or DC input
■
Programmable sense voltage
■
Logic level compatibility
■
Threshold guaranteed over temperature (0°C to 70°C)
■
Optoplanar™ construction for high common mode
immunity
■
UL recognized (file # E90700)
■
VDE certified – ordering option ‘V’, e.g., HCPL3700V
Applications
■
Low voltage detection
■
5 V to 240 V AC/DC voltage sensing
■
Relay contact monitor
■
Current sensing
■
Microprocessor Interface
■
Industrial controls
Description
The HCPL-3700 voltage/current threshold detection
optocoupler consists of an AlGaAs LED connected to a
threshold sensing input buffer IC which are optically cou-
pled to a high gain darlington output. The input buffer
chip is capable of controlling threshold levels over a wide
range of input voltages with a single resistor. The output
is TTL and CMOS compatible.
Schematic
Package
8
8
1
8
1
1
TRUTH TABLE
(Positive Logic)
A 0.1 µF bypass capacitor must
be connected between pins 8
and 5.
Input
Output
H
L
L
H
1
2
3
4
5
8
6
7
AC
DC+
DC-
AC
GND
V
NC
V
O
CC
AC/DC
POWER
LOGIC
R
X
HCPL-3700
GND 1
GND 2
