ht16561 & ht 16561b ( 44 qfp)

vfd digital clock

features:
vfd display 12 hour clock function
4.194304mhz crystal oscillation
zero adjust function
integrated voltage regulator permits wide 4v to 16v
operating voltage range
four level contrast control function
44-pin qfp package

general description
the ht16561 provides direct drive to vfd panels to im-plement a 12 hour clock function. in addition to obtaining
its time base from a 4.194304mhz crystal oscillation source and in having a wide operating voltage, the device also contains a host of other features. these include a choice of adjustment modes, including single push increment or 2hz fast forward functions. additional features are provided in the form of zero adjustment and four levels of contrast control.