Description
These high gain series couplers use a Light Emitting Diode and an integrated high gain photodetector to provide extremely high current transfer ratio between input and output. Separate pins for the photodiode and output stage result in TTL compatible saturation voltages and high speed operation. Where desired the VCC and VO terminals may be tied together to achieve conventional photodarlington operation.A base access terminal allows a gain bandwidth adjustment to be made.

Features
• High Current Transfer Ratio
  – 2000% Typical (4500%
Typical for HCNW139/138)
• Low Input Current Requirements – 0.5 mA
• TTL Compatible Output – 0.1 V VOL Typical
• Performance Guaranteed over Temperature 0°C to 70°C
• Base Access Allows Gain Bandwidth Adjustment
• High Output Current –60 mA

Applications
• Ground Isolate Most Logic Families – TTL/TTL, CMOS/ TTL, CMOS/CMOS, LSTTL/ TTL, CMOS/LSTTL
• Low Input Current Line Receiver
• High Voltage Insulation (HCNW139/138)
• EIA RS-232C Line Receiver
• Telephone Ring Detector
• 117 V ac Line Voltage Status Indicator – Low Input Power Dissipation
• Low Power Systems – Ground Isolation