HV623

HV623 32-Channel 128-Level Amplitude Gray-Shade Display Column Driver Ordering Information Package Option Device HV623 64-Lead 3-sided Plastic Gullwing HV623PG Features 5V CMOS inputs Up to 80V modulation voltage Capable of 128 levels of gray shading 20MHz data throughput rate 32 outputs per device (can be cascaded) Pin-programmable shift direction (DIR) D/A conversion cycle time is 32µs Diodes in output structure allow usage in energy recovery systems Integrated HVCMOS® technology Available in 3-sided 64-lead gullwing package General Description The HV623 is a 32-channel driver IC for gray shade display use. It is designed to produce varying output voltages between 3 and 80 volts. This amplitude modulation at the output is facilitated by an external ramp voltage VR. See Theory of Operation for detailed explanation. This device consists of a dual 16-bit shift registers, 32 data latches and comparators, and control logic to preform 128 levels of gray shading. There are 7 bits of data inputs. Data is shifted through the shift registers at both edges of the clock, resulting a data transfer rate of twice of the shift clock frequency. When the DIR pin is high, CSI/CSO is the input/output for the chip select pulse. When DIR is low, CSI/CSO is the output/input for the chip select pulse. The DIR = HIGH also allows the HV623 to shift data in the counterclockwise direction when viewed from the top of the package. When the DIR pin is low, data is shifted in the clockwise direction. Th...