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14.0 AC Timing Parameters
Parametrlcs Disclaimer
The current AC and DC specifications contained in this doc-
ument are a combination of target design specifications, lim-
ited sampled empirical data, and some characterization
data. Currently, this information does not represent all actu-
al guaranteed tested timing parameters. Guaranteed specifi-
cations wlll be provided after full device characterization.
For more specific information regards DC and AC parame-
ters, contact National Semiconductor.
AC TTL PARAMETERS
Tx Port Timing
TL/F/11928–16
Y
Symbol
Description
Min
TYP
Max
Units
1
t
TCKP
(Note 1)
Transmit Clock Period
(1/f
e
T:
@
50 MHz, T
e
20 ns,
@
33 MHz, T
e
30 ns (Note C)
1/f
ns
2
t
TCKPW
(Note 1)
Transmit Clock Pulse Width (fmax
e
50 MHz) (Note C)
1/2f–20%
1/2f
1/2f
a
20%
ns
3
t
TDS
Symbol and Type Set up to Clock High
(Note A)
(Note B)
5
4
3.6
ns
4
t
TDH
Symbol and Type Hold Time (Note C)
3
0.7
ns
5
t
TOK
Clock High to TxOK Valid (Note A)
8.7
12
ns
Note 1:
This parameter is dependent on clock frequency.
Note A:
Limit guaranteed by test program.
Note B:
Limit based on simulation results.
Note C:
Limit based on bench characterization.
33
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