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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.
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 (铿乴e #102915), 鈥?add option V (e.g.,
MID400V)
Applications
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Monitoring of the AC/DC 鈥渓ine-down鈥?condition
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鈥淐losed-loop鈥?interface between electromechanical
elements such as solenoids, relay contacts, small
motors, and microprocessors
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Time delay isolation switch
Schematic
Package
1
8
V
CC
8
N/C
2
7
AUX
1
3
6
V
0
N/C
4
5
GND
8
1
8
1
Equivalent Circuit
漏2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
MID400 Rev. 1.0.1
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