AP1611

The AP1611 is one member of the C16x family that has schmitt-trigger input characteristics. These Schmitt-Triggers are intended to always provide proper internal low and high levels, even if an undefined voltage level (between TTL-VIL and TTL-VIH) is externally applied to the pin. For input signals, which do not provide the required rise/fall times, external circuitry must be used to shape the signal transitions.

The AP1611 must be taken care that rising/falling input signals pass the undefined area of the TTL-specification between VIL and VIH with a sufficient rise/fall time, as generally usual and specified for TTL components (e.g. 74LS series: gates 1V/us, clock inputs 20V/us). The effect of the implemented Schmitt-Trigger is that even if the input signal remains in the undefined area, well defined low/high levels are generated internally. If you want to know more information such as the electrical characteristics about the AP1611, please download the datasheet in www.seekic.com or www.chinaicmart.com .