900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






Exar Corporation

XRK7955 Datasheet Preview

XRK7955 Datasheet

INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER

No Preview Available !

xrwww.DataSheet4U.com
PRELIMINARY
XRK7955
INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER
MARCH 2005
GENERAL DESCRIPTION
The XRK7955 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 5x, phase aligned clock outputs.
External PLL feedback is used to also provide zero
delay buffer performance.
The XRK7955 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
REV. P1.0.1
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
Fully Integrated PLL
Intelligent Dynamic Clock Switch
LVPECL Clock Outputs
LVCMOS Control I/O
3.3V Operation
32-Lead LQFP Packaging
FIGURE 1. BLOCK DIAGRAM OF THE XRK7955
CLK_Selected
INP1Bad
INP0Bad
Man_Override
Alarm_Reset
Sel_CLK
CLK0
CLK0
CLK1
CLK1
Ext_FB
Ext_FB
MR
Dynamic
Switch
Logic
OR
PLL
200-400MHz
÷2
÷10
PLL_En
Qb0
Qb0
Qb1
Qb1
Qb2
Qb2
Qa0
Qa0
Qa1
Qa1
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XRK7955 Datasheet Preview

XRK7955 Datasheet

INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER

No Preview Available !

xr
REV. P1.0.1
PRELIMINARY
XRK7955
INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER
PRODUCT ORDERING INFORMATION
PRODUCT NUMBER
XRK7955
PACKAGE TYPE
32-Lead LQFP
OPERATING TEMPERATURE RANGE
-40°C to +85°C
FIGURE 2. PIN OUT OF THE XRK7955
Qa1
Qa1
Qa0
Qa0
VCC
VCC_PLL
Man_Override
PLL_En
25
26
27
28
29
30
31
32
XRK7955
16 VCC
15 Inp0bad
14 Inp1bad
13 CK_Selected
12 GND
11 Ext_FB
10 Ext_FB
9 GND
2


Part Number XRK7955
Description INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER
Maker Exar Corporation
Total Page 10 Pages
PDF Download

XRK7955 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 XRK7955 INTELLIGENT DYNAMIC CLOCK SWITCH PLL CLOCK DRIVER
Exar Corporation





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy