| The iC-MFL, iC-MFN and iC-MFP are monolithically integrated, eight-channel level shifting devices that drive logic and N- and P-channel power FETs. The internal circuit blocks have been designed in such a way that with single errors, such as open pins (VB, VBR, GND, GNDR) or the short-circuiting of two outputs, the iC-MF L/N/P's output stages switch to a predefined, safe OFF state. The safe shutdown of externally connected FETs is thus guaranteed in the event of a single error.
Typical applications include the operation of FETs from 1.8V, and 3.3 or 5V TTL- and CMOS-compatible systems, such as FPGAs, modern microcontrollers and microprocessors which require devices to be fail safe. 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 (1.8, 3.3 or 5V). They are also voltage-proof up to 40V. The pull-down currents have two stages in order to enhance input noise immunity and minimise power dissipation. The eight channels have a current-limited push-pull output stage and a pull-up/pull-down resistor at their outputs. Should the supply voltage at VB undershoot a predefined threshold, the voltage monitor actively switches the outputs to OFF state. If either the supply voltage or the ground connection ceases, the outputs can still obtain a safe off state. Even if two outputs are short circuited with an active FET drive with a high signal, the off state driver's ability to draw current predominates, keeping the connected FETs in a safe shutdown state. The status of the device is indicated by open-drain pin NOK and can be used for the systems diagnostics of individual channels. The devices are protected against ESD. A temperature monitor protects the devices from destruction by excessive high power dissipation. The devices operate within a range of from -40 to +125C and are available in a RoHS compliant QFN24 package. | 
20:26 [24/11/2006] Post by