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XRK4991A Datasheet(PDF) 6 Page - Exar Corporation

Part No. XRK4991A
Description  3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
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Maker  EXAR [Exar Corporation]
Homepage  http://www.exar.com
Logo EXAR - Exar Corporation

XRK4991A Datasheet(HTML) 6 Page - Exar Corporation

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XRK4991A
PRELIMINARY
xr
3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
REV. P1.0.2
6
NOTES:
4. FB_IN connected to an output selected for "zero" skew (i.e. SELx1 = SELx0 = MID).
TEST MODE
The TEST input is a three-level input. In normal system operation, this pin is connected to ground, allowing the
XRK4991 to operate as explained briefly above (for testing purposes, any of the three-level inputs can have a
removable jumper to ground, or be tied LOW through a 100
Ω resistor. This will allow an external tester to
change the state of these pins.)
If the TEST input is forced to its MID or HIGH state, the device will operate with its internal phase locked loop
disconnected, and input levels supplied to CLKIN will directly control all outputs. Relative output to output
functions are the same as in normal mode.
In contrast with normal operation (TEST tied LOW). All outputs will function based only on the connection of
their own function select inputs (SELx[1:0]) and the waveform characteristics.
FIGURE 3. TYPICAL OUTPUTS WITH FB_IN CONNECTED TO A ZERO-SKEW OUTPUT [4]
(N/A)
LM
LL
LH
LM
(N/A)
LH
ML
ML
(N/A)
MM
MM
MH
(N/A)
HL
MH
HM
(N/A)
HH
HL
(N/A)
HM
(N/A)
LL/HH
(N/A)
HH
-6t
U
-4t
U
-3t
U
-2t
U
-1t
U
0t
U
+1t
U
+2t
U
+3t
U
+4t
U
+6t
U
DIVIDED
INVERT
SELA-QA[1:0] SELC-QC[1:0]
SELB-QB[1:0] SELD-QD[1:0]
FB_IN
CLKIN


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