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XRK7933

Part Number	XRK7933
Manufacturer	Exar Corporation
Description	INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER
Published	Aug 22, 2007
Detailed Description	www.DataSheet4U.com xr MARCH 2005 PRELIMINARY XRK7933 REV. P1.0.1 INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER ...
Datasheet	XRK7933 PDF File

Overview

www.
DataSheet4U.
com xr MARCH 2005 PRELIMINARY XRK7933 REV.
P1.
0.
1 INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER be latched (H).
If that CLK is the primary clock, the device will switch to the good secondary clock and phase/frequency alignment will occur with minimal output phase disturbance.
The typical phase bump caused by a failed clock is eliminated.
FEATURES GENERAL DESCRIPTION The XRK7933 is a PLL clock driver designed specifically for redundant clock tree designs.
The device receives two differential LVPECL clock signals from which it generates 5 new differential LVPECL clock outputs.
Two of the output pairs regenerate the input signals frequency and phase while the other three pairs generate 3x, phase aligned clock outputs.
External PLL feedback is used to also provide zero delay buffer performance.
The XRK7933 Intelligent Dynamic Clock Switch circuit continuously monitors both input CLK signals.
Upon detection of a failure (CLK stuck HIGH or LOW for at least 1 period), the INP_BAD for that CLK will FIGURE 1.
BLOCK DIAGRAM OF THE XRK7933 • Fully Integrated PLL • Intelligent Dynamic Clock Switch • LVPECL Clock Outputs • LVCMOS Control I/O • 3.
3V Operation • 32-Lead LQFP Packaging CLK_Selected INP1Bad INP0Bad Man_Override Alarm_Reset Sel_CLK Dynamic Switch Logic PLL_En Qb0 Qb0 Qb1 Qb1 ÷4 Qb2 Qb2 Qa0 Qa0 Qa1 Qa1 OR CLK0 CLK0 CLK1 CLK1 Ext_FB Ext_FB MR PLL 200-400MHz ÷12 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.
exar.
com xr REV.
P1.
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1 PRELIMINARY XRK7933 INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER PRODUCT ORDERING INFORMATION PRODUCT NUMBER XRK7933 PACKAGE TYPE 32-Lead LQFP OPERATING TEMPERATURE RANGE -40°C to +85°C FIGURE 2.
PIN OUT OF THE XRK7933 VCC 24 23 22 21 20 19 18 Qa1 Qa1 Qa0 Qa0 VCC VCC_PLL Man_Override PLL_En 17 VCC Qb0 Qb0 Qb1 Qb1 Qb2 Qb2 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 16 15 14 VCC Inp0bad Inp1bad CK_Selected GND Ext_FB Ext_FB GND XRK7933 ...

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