鈥?/div>
NOTES:
1. All timing and jitter tolerances apply for F
NOM
> 25MHz.
2. Skew is the time between the earliest and the latest output transition among all outputs for which the same t
U
delay has been selected when all are loaded with the specified
load.
3. t
SKEWPR
is the skew between a pair of outputs (xQ
0
and xQ
1
) when all eight outputs are selected for 0t
U
.
4. t
SKEW0
is the skew between outputs when they are selected for 0t
U
.
5. For IDT5991A-2 t
SKEW0
is measured with C
L
= 0pF; for C
L
= 30pF, t
SKEW0
= 0.35ns Max.
6. There are 3 classes of outputs: Nominal (multiple of t
U
delay), Inverted (4Q
0
and 4Q
1
only with 4F
0
= 4F
1
= HIGH), and Divided (3Qx and 4Qx only in Divide-by-2 or Divide-
by-4 mode).
7. t
DEV
is the output-to-output skew between any two devices operating under the same conditions (V
CC
, ambient temperature, air flow, etc.)
8. t
LOCK
is the time that is required before synchronization is achieved. This specification is valid only after V
CC
is stable and within normal operating limits. This parameter is
measured from the application of a new signal or frequency at REF or FB until t
PD
is within specified limits.
9. t
PD
is measured with REF input rise and fall times (from 0.8V to 2V ) of 1ns.
10. Measured at 2V.
11. Measured at 0.8V.
5