DataSheetWiki


XRK32308 fiches techniques PDF

Exar Corporation - 3.3V ZERO DELAY BUFFER

Numéro de référence XRK32308
Description 3.3V ZERO DELAY BUFFER
Fabricant Exar Corporation 
Logo Exar Corporation 





1 Page

No Preview Available !





XRK32308 fiche technique
www.DataSheet4U.com
PRELIMINARY
XRK32308
3.3V ZERO DELAY BUFFER
MAY 2006
REV. P1.0.2
GENERAL DESCRIPTION
FUNCTIONAL DESCRIPTION
XRK32308 is a 3.3V Zero Delay Buffer designed to
distribute high-speed clocks in PC, workstation,
datacom, telecom, and other high-performance
applications.
The part has an on-chip PLL which locks to an input
clock presented on the REF pin. The PLL feedback is
required to be driven into the FB pin, and can be
obtained from one of the outputs. The input-to-output
skew is guaranteed to be less than 350 ps, and
output-to-output skew is guaranteed to be less than
200 ps.
XRK32308 has two banks of four outputs each.
These can be controlled by the Select inputs as
shown in Table 2, “Select Input Decoding,” on page 2.
If all output clocks are not required, Bank B can be
three-stated. The select inputs also allow the input
clock to be directly applied to the output for chip and
system testing purposes.
Multiple XRK32308 devices can accept the same
input clock and distribute it in a system. In this case,
the skew between the outputs of two devices is
guaranteed to be less than 700 ps.
XRK32308 devices are available in five different
configurations, as shown in Table 3, “Available
XRK32308 Configurations,” on page 3.
The XRK32308–1 is the base part, where the output
frequencies equal the reference if there is no counter
in the feedback path.
The XRK32308–1H is the high-drive version of the –
1. Rise and fall times on this device are faster.
The XRK32308–2 allows the user to obtain 1X, and
2X or X/2 depending on which Bank sources the FB
signal.
The XRK32308–3 allows the user to obtain 4X and
2X frequencies or 1X and 2X.
The XRK32308–4 enables the user to obtain 2X
clocks on all outputs.
The XRK32308–5H is a high-drive version with REF/
2 on both banks.
FEATURES
Zero input-output propagation delay, adjustable by
capacitive load on FB input
Multiple configurations, see “Available XRK32308
Configurations” table
Multiple low-skew outputs
Two banks of four outputs, three-stateable by two
select inputs
10-MHz to 120-MHz operating range
75ps typical cycle-to-cycle jitter (15pF, 66MHz)
Space-saving 16-pin 150-mil SOIC package or 16-
pin TSSOP
3.3V operation
Industrial and commercial temperature available
FIGURE 1. BLOCK DIAGRAM AND PIN CONFIGURATION OF THE XRK32308
REF
/2
/2
PLL
Extra Divider (-3, -4)
Extra Divider (-5H)
S2 Select Input
Decoding
S1
MUX
/2
Extra Divider (-2, -3)
FB
QA0
QA1
QA2
QA3
QB0
QB1
QB2
QB3
REF
QA0
QA1
VDD
GND
QB0
QB1
S2
1
2
3
4
5
6
7
8
16 FB
15 QA3
14 QA2
13 VDD
12 GND
11 QB3
10 QB2
9 S1
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

PagesPages 14
Télécharger [ XRK32308 ]


Fiche technique recommandé

No Description détaillée Fabricant
XRK32308 3.3V ZERO DELAY BUFFER Exar Corporation
Exar Corporation
XRK32309 LOW-COST 3.3V ZERO DELAY BUFFER Exar Corporation
Exar Corporation

US18650VTC5A

Lithium-Ion Battery

Sony
Sony
TSPC106

PCI Bus Bridge Memory Controller

ATMEL
ATMEL
TP9380

NPN SILICON RF POWER TRANSISTOR

Advanced Semiconductor
Advanced Semiconductor


www.DataSheetWiki.com    |   2020   |   Contactez-nous  |   Recherche