VESTEL 17MB12, Service Manual

Page: 38 / 64

15.8.4 Pinning
VEE supply pin is provided for analog input signals. It has an inhibit (INH) input terminal
to disable all the switches when high. For operation as a digital
multiplexer/demultiplexer, VEE is connected to GND.
A and B control inputs select one channel out of four in each section. All inputs are
equipped with protection circuits against static discharge and transient excess voltage.
15.9 Max809
15.9.1 General Description
The MAX809 and MAX810 are cost
− effective system supervisor circuits designed to
monitor VCC in digital systems and provide a reset signal to the host processor when
necessary. No external components are required.
The reset output is driven active within 10 _sec of VCC falling through the reset voltage
threshold. Reset is aintained active for a timeout period which is trimmed by the factory
after VCC rises above the reset threshold. The MAX810 has an active
− high RESET