ISL71831SEH Datasheet, PDF (17/21 Pages) Intersil Corporation – Radiation Hardened 5V 32-Channel Analog Multiplexer

ISL71831SEH
Applications Information
Power-Up Considerations
The circuit is designed to be insensitive to any given power-up
sequence between V+ and VREF, however, it is recommended
that all supplies power-up relatively close to each other.
Overvoltage Protection
The ISL71831SEH has overvoltage protection on both the input
as well as the output. On the output, the voltage is limited to a
diode past the rails. Each of the inputs has independent
overvoltage protection that works regardless of the switch being
selected. If a switch experiences an overvoltage condition, the
switch is turned off. As soon as the voltage returns within the
rails, the switch returns to normal operation.
VREF and Logic Functionality
The VREF pin sets the logic threshold for the ISL71831SEH. The
range for VREF is between 3V and 5.5V. The switching point is set
to around 50% of the voltage presented to VREF. This switching
point allows for both 5V and 3.3V logic control.
ISL71830SEH vs ISL71831SEH
A 16-channel version of the ISL71831SEH is available in a 28 Ld
CDFP. In terms of performance specs, the parts are very similar
in behavior. Apart from the apparent increase in channel density,
the ISL71831SEH does have slightly higher output leakage
compared to the ISL71830SEH due to having more channels
connected to the output. The supply current for the ISL71831SEH
is also a bit higher compared to the ISL71830SEH.
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FN8759.2
November 18, 2016