PI6C991J Ver la hoja de datos (PDF) - Pericom Semiconductor
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PI6C991J Datasheet PDF : 9 Pages
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PI6C991
5V High Speed Programmable Skew
Clock Buffer - SuperClockTM
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Table 1. Frequency Range Select and tU Calculation(1)
FS(2,3)
fNOM(MHz)
Min. Max.
tU
=
1
fNOM
x
N
where N=
Approximate
Frequency
(MHz) at
which
tU = 1.0ns
LOW 15
30
44
22.7
MID 25
50
26
38.5
HIGH 40
100
16
62.5
Table 2. Programmable Skew Configurations(1)
Function Selects
Output Functions
1F1, 2F1,
3F1, 4F1
1F0, 2F0,
3F0, 4F0
1Q0, 1Q1,
2Q0, 2Q1
3Q0, 3Q1
4Q0,
4Q1
LOW
-4tU
LOW
MID
-3tU
HIGH
-2tU
LOW
-1tU
MID
MID
HIGH
+1tU
LOW
+2tU
HIGH
MID
+3tU
Divide by 2
-6tU
-4tU
-2tU
-0tU
+2tU
+4tU
+6tU
HIGH
+4tU Divide by 4 Inverted
1Fx 3Fx
2Fx 4Fx
(N/A) LM
FB Input
REF Input
-6tU
LL LH -4tU
LM (N/A) -3tU
LH ML -2tU
ML (N/A) -1tU
MM MM 0tU
MH (N/A) +1tU
HL MH +2tU
HM (N/A) +3tU
HH HL +4tU
(N/A) HM +6tU
(N/A) LL/HH DIVIDED
(N/A) HH INVERT
Figure 1. Typical Outputs with FB Connected to a Zero-Skew Output(4)
3
PS8448 10/10/00
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