The device has two parallel 32-bit shift registers, permitting data rate twice the speed of one (they are clocked together). There are also 64 latches and control logic to perform the blanking of the outputs. HVOUT1 is connected to the first stage of the first shift register through the blanking logic. Data is shifted through the shift registers on the logic low to high transition of the clock. The DIR pin causes CCW shifting when connected to VSS, and CW shifting when connected to VDD. A data output buffer is provided for cascading devices. This output reflects the current status of the last bit of the shift register (HVOUT64). Operation of the shift register is not affected by the LE (latch enable), or the BL (blanking) inputs. Transfer of data from the shift registers to latches occurs when the LE input is high. The data in the latches is stored when LE is low.