Datasheet

EXPLANATION OF FUNCTION TABLES
1–10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
The following symbols are used in function tables on TI data sheets:
H = high level (steady state)
L = low level (steady state)
↑ = transition from low to high level
↓ = transition from high to low level
= value/level or resulting value/level is routed to indicated destination
= value/level is re-entered
X = irrelevant (any input, including transitions)
Z = off (high-impedance) state of a 3-state output
a...h = the level of steady-state inputs A through H, respectively
Q
0
= level of Q before the indicated steady-state input conditions were established
Toggle = each output changes to the complement of its previous level on each active
transition indicated by ↓ or ↑
Q
0
= complement of Q
0
or level of Q before the indicated steady-state input
conditions were established
Q
n
= level of Q before the most recent active transition indicated by ↓ or ↑
= one high-level pulse
= one low-level pulse
If, in the input columns, a row contains only the symbols H, L, and/or X, this means the indicated output is valid
whenever the input configuration is achieved and regardless of the sequence in which it is achieved. The output
persists so long as the input configuration is maintained.
If, in the input columns, a row contains H, L, and/or X together with ↑ and/or ↓, this means the output is valid whenever
the input configuration is achieved but the transition(s) must occur following the achievement of the steady-state
levels. If the output is shown as a level (H, L, Q
0
, or Q
0
), it persists so long as the steady-state input levels and the
levels that terminate indicated transitions are maintained. Unless otherwise indicated, input transitions in the opposite
direction to those shown have no effect at the output. (If the output is shown as a pulse, or , the pulse follows
the indicated input transition and persists for an interval dependent on the circuit.)