HT16566 -- 1/2 Duty VFD Digital Clock

The HT16566 provides direct drive to VFD panels to implement a 24 hour Clock function. Obtaining its time base from a 4.194304MHz crystal oscillation source and in having a wide operating voltage due to its internal voltage Regulator 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 Blank control, Zero adjustment and four levels of illumination control.
By Holtek Semiconductor Inc.