IC-Haus offers eight-channel level shifter
An IC-Haus product story
Edited by the Electronicstalk editorial team Sep 9, 2009
IC-Haus has introduced the IC-MFL: a monolithically integrated, eight-channel level shifter to drive logic FETs.
The internal circuit blocks have been designed in such a way that, with single errors, such as open pins or the short-circuiting of two outputs, the IC-MFL output stages switch to a predefined safe state.
Externally connected FETs therefore shut down safely in the event of a single error.
The device is now qualified for typical SIL/ASIL applications according to AEC Q100.
The typical applications are driving FETs from 1.8V, 3.3V or 5V TTL- and CMOS-compatible systems such as field-programmable gate arrays (FPGAs), modern microcontrollers and microprocessors with failsafe requirements to achieve functional safety at the subsystem level in the automotive area.
A device-related FMEA analysis has been the base for the development and is available for the user's own end equipment SIL/ASIL qualification.
The inputs of the eight channels consist of a Schmitt trigger with a pull-down current source and are compatible with TTL and CMOS levels (1.8V, 3.3V or 5V) and are voltage proof up to 18V.
Pull-down resistors provide the safe low level at open inputs and have two stages in order to minimise power dissipation with enhanced noise immunity.
The eight channels have a current-limiting push-pull output stage and a pull-down resistor.
Should the supply voltage at VB drop below a predefined threshold, the voltage monitor causes the outputs to be actively tied to the off-state.
If the supply voltage or one ground connection ceases, the outputs still reach the safe off-state.
Even with two outputs shorted and one driving an FET with a high signal, the off-state driver predominates, keeping the connected FETs in a safe shutdown state.
The devices are protected against destruction by ESD.
Temperature monitoring protects the devices from high-power dissipation.
The devices operate from -40C to +125C and are available in a RoHS-conform QFN24 package.
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