Цитата
Parallel/Serial/Byte Interface Selection Input. Logic input. If this pin is tied to
a logic low, the parallel interface is selected. If this pin is tied to a logic high,
the serial interface is selected. Parallel byte interface mode is selected when
this pin is logic high and DB15/BYTE SEL is logic high (see Table 8).
In serial mode, the RD/SCLK pin functions as the serial clock input. The
DB7/D OUT A pin and the DB8/D OUT B pin function as serial data outputs. When
the serial interface is selected, the DB[15:9] and DB[6:0] pins should be tied to
ground.
In byte mode, DB15, in conjunction with PAR/SER/BYTE SEL, is used to select
the parallel byte mode of operation (see Table 8). DB14 is used as the HBEN
pin. DB[7:0] transfer the 16-bit conversion results in two RD operations,
with DB0 as the LSB of the data transfers.
Цитата
Logic Input Current (Iin) ±2 µA
В-общем, кладите на землю без резистора. А хотите, с резистором 1...10 кОм. Тогда, при желании, сможете подпаять к нему единицу, если потребуется.