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XRK39910 fiches techniques PDF

Exar Corporation - 3.3V LOW SKEW PLL CLOCK DRIVER

Numéro de référence XRK39910
Description 3.3V LOW SKEW PLL CLOCK DRIVER
Fabricant Exar Corporation 
Logo Exar Corporation 





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XRK39910 fiche technique
www.DataSheet4U.com
JULY 2006
FUNCTIONAL DESCRIPTION
The XRK39910 is a high fanout phase locked-loop
clock driver intended for high performance computing
and data-communications applications. It has eight
zero delay LVTTL outputs.
When the OE pin is held low, all the outputs are syn-
chronously enabled. However, if OE is held high, all
the outputs except Q2 and Q3 are synchronously dis-
abled.
Furthermore, when the PE is held high, all the outputs
are synchronized with the positive edge of the CLKIN.
When PE is held low, all the outputs are synchronized
with the negative edge of CLKIN.
The FB_IN signal is compared with the input CLKIN
signal at the phase detector in order to drive the
VCO. Phase differences cause the VCO of the PLL to
adjust upwards or downwards accordingly.
An internal loop filter moderates the response of the
VCO to the phase detector. The loop filter transfer
function has been chosen to provide minimal jitter (or
frequency variation) while still providing accurate
responses to input frequency changes.
FIGURE 1. FUNCTIONAL BLOCK DIAGRAM
CLKIN
FB_IN
FSEL*
PE
Bypass*
OE
Ref
VCO
PLL
Feedback
H
M
L
* Tri-Level inputs
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
XRK39910
3.3V LOW SKEW PLL CLOCK DRIVER
REV. 1.0.0
FEATURES
Eight zero delay outputs
12mA balanced drive outputs
Output frequency: 15MHz to 85MHz
<250ps of output to output skew
Low Jitter: <200ps peak-to-peak
3 skew grades
External feedback, internal loop filter
Selectable positive or negative
synchronization
Synchronous output enable
3-level inputs for PLL range control
PLL bypass for DC testing
Available in SOIC package
edge
FIGURE 2. PIN CONFIGURATION
CLKIN 1
24 GND
VDDPLL
FSEL
2
3
23 Bypass
22 nc
nc 4
21 OE
PE
VDD
Q0
5
6
7
20 VDD
19 Q7
XRK39910
18 Q6
Q1 8
17 GND
GND 9
16 Q5
Q2 10
15 Q4
Q3
VDD
11
12
14 VDD
13 FB_IN
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

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