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XRK32308

Part Number	XRK32308
Manufacturer	Exar Corporation
Description	3.3V ZERO DELAY BUFFER
Published	Aug 22, 2007
Detailed Description	www.DataSheet4U.com MAY 2006 PRELIMINARY XRK32308 3.3V ZERO DELAY BUFFER REV. P1.0.2 GENERAL DESCRIPTION FUNCTIONAL D...
Datasheet	XRK32308 PDF File

Overview

www.
DataSheet4U.
com MAY 2006 PRELIMINARY XRK32308 3.
3V ZERO DELAY BUFFER 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 • T...

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