Table 7-1 lists the functional modes of the SN74LVC166A.
Table 7-1 Operating Mode Table
INPUTS(1) |
FUNCTION |
SH/LD |
CLK |
CLK INH |
L |
X |
X |
Parallel load(2) |
H |
H |
X |
No change |
H |
X |
H |
No change |
H |
L |
↑ |
Shift(3) |
H |
↑ |
L |
Shift(3) |
(1) H = High voltage level, L = Low
voltage level, X = Don't care, ↑ = Low to high transition
(2) Parallel load : Values at inputs A through H are loaded to respective
internal registers synchronously with the clock.
(3) Shift : Content of each internal register shifts towards serial
output QH synchronously with the clock. Data at SER is shifted into
the first register.
Table 7-2 Output Function Table
INTERNAL REGISTERS(1)(2) |
OUTPUTS(3) |
A — G |
H |
Q |
X |
L |
L |
X |
H |
H |
(1) Internal registers refer to the
shift registers inside the device. These values are set by loading data from the
parallel or serial inputs.
(2) H = High voltage level, L = Low
voltage level, X = Don't care
(3) H = Driving high, L = Driving low