MID400_06 Datasheet, PDF (1/11 Pages) Fairchild Semiconductor – AC Line Monitor Logic-Out Device

MID400
AC Line Monitor Logic-Out Device
November 2006
Features
■ Direct operation from any line voltage with the use of
an external resistor.
■ Externally adjustable time delay
■ Externally adjustable AC voltage sensing level
■ High voltage isolation between input and output
■ Compact plastic DIP package
■ Logic level compatibility
■ UL recognized (File #E90700)
■ VDE recognized (file #102915), – add option V (e.g.,
MID400V)
Applications
■ Monitoring of the AC/DC “line-down” condition
■ “Closed-loop” interface between electromechanical
elements such as solenoids, relay contacts, small
motors, and microprocessors
■ Time delay isolation switch
Description
The MID400 is an optically isolated AC line-to-logic inter-
face device. It is packaged in an 8-lead plastic DIP. The
AC line voltage is monitored by two back-to-back GaAs
LED diodes in series with an external resistor. A high
gain detector circuit senses the LED current and drives
the output gate to a logic low condition.
The MID400 has been designed solely for the use as an
AC line monitor. It is recommended for use in any
AC-to-DC control application where excellent optical iso-
lation, solid state reliability, TTL compatibility, small size,
low power, and low frequency operations are required.
Schematic
Package
1
N/C 2
3
N/C ₄
8 ^V_CC
7 ^AUX
6 V₀
5 ^GND
Equivalent Circuit
8
1
8
1
8
1
©2005 Fairchild Semiconductor Corporation
1
MID400 Rev. 1.0.1
www.fairchildsemi.com