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Exar Corporation

XRK49911 Datasheet Preview

XRK49911 Datasheet

SKEW CLOCK BUFFER

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XRK49911
3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
OCTOBER 2005
FUNCTIONAL DESCRIPTION
FEATURES
REV. 1.0.1
The XRK49911 is a 3.3V High-Speed Low-Voltage
Programmable Skew Clock Buffer. It is intended for
high-performance computer systems and offers user
selectable control over system clock functions to
optimize timing. Eight outputs, arranged in four
banks, can each drive 50terminated transmission
lines while delivering minimal and specified output
skews and full-swing Low Voltage TTL logic levels.
Each bank (two outputs per bank) can be individually
selected for one of nine delay or function
configurations through two dedicated tri-level inputs.
These outputs are able to lead or lag the CLKIN input
reference clock by up to 6 time units from their
nominal “zero” skew position. The integrated PLL
allows external load and transmission line delay
effects to be canceled achieving zero delay capability.
Combining the zero delay capability with the
selectable output skew functions, output-to-output
delays of up to ±12 time units can be created.
The XRK49911’s divide functions (divide-by-two and
divide-by-four) allow distribution of a low-frequency
clock that can be multiplied by two or four at the clock
destination. This feature facilitates clock distribution
while allowing maximum system clock flexibility.
3.75- to 110-MHz output operation
All output pair skew <100 ps typical
Three skew grades
-2 : tSKEW0<250ps
-5 : tSKEW0<500ps
-7 : tSKEW0<700ps
Selectable output functions
Skew adjustments of +/- 6tU (up to 18 ns)
Inverted and non-inverted
Operation at 1/2 and 1/4 input frequency
Operation at 2x and 4x input frequency
Cycle-Cycle Jitter
< 25 ps (rms)
< 200 ps (pk-pk)
Zero input-to-output delay
50% duty-cycle outputs
LVTTL outputs drive 50terminated lines
Operates from a single 3.3V supply
32-pin PLCC package
Green packaging
Lead free lead frame available
FIGURE 1. BLOCK DIAGRAM OF THE XRK49911
CLKIN
FB_IN
Ref
PLL
Feedback
FSEL*
PLL_BYPASS*
SELA[1:0]*
SELB[1:0]*
SELC[1:0]*
SELD[1:0]*
* Tri-Level inputs
2
2
2
2
H
M
L
Bank “SKEW”
Control
QA0
QA1
QB0
QB1
QC0
QC1
QD0
QD1
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XRK49911 Datasheet Preview

XRK49911 Datasheet

SKEW CLOCK BUFFER

No Preview Available !

XRK49911
3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
PRODUCT ORDERING INFORMATION
xr
REV. 1.0.1
PRODUCT NUMBER
XRK49911IJ-2
XRK49911CJ-2
XRK49911IJ-5
XRK49911CJ-5
XRK49911CJ-7
ACCURACY
250 ps
250 ps
500 ps
500 ps
750 ps
TEMPERATURE RANGE
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
FIGURE 2. PIN OUT OF THE XRK49911
SELC1
SELD0
SELD1
VCCQ
VCCN
QD1
QDO
GND
GND
4 3 2 1 32 31 30
5 29
6 28
7 27
8 26
9 XRK49911 25
10 24
11 23
12 22
13 21
14 15 16 17 18 19 20
SELB0
GND
SELA1
SELA0
VCCN
QA0
QA1
GND
GND
2


Part Number XRK49911
Description SKEW CLOCK BUFFER
Maker Exar Corporation
Total Page 12 Pages
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