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PI6C2952 Datasheet(PDF) 1 Page - Pericom Semiconductor Corporation

Part No. PI6C2952
Description  Low Voltage PLL Clock Driver
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Maker  PERICOM [Pericom Semiconductor Corporation]
Homepage  http://www.pericom.com
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PI6C2952 Datasheet(HTML) 1 Page - Pericom Semiconductor Corporation

   
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PS8542A
01/30-06
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PI6C2952
Description
The PI6C2952 is a 3.3V compatible, PLL-based clock driver device
targeted for high-performance clock applications. The device fea-
tures a fully integrated PLL with no external components
required. With output frequencies up to 180MHz and eleven low-
skew outputs, the PI6C2952 is well suited for high-performance
designs. The device employs a fully differential PLL design to
optimize jitter and noise rejection performance.
The PI6C2952 features three banks of individually configurable
outputs. The banks contain 5 outputs, 4 outputs, and 2 outputs. The
internal divide circuitry allows for output frequency ratios of 1:1, 2:1,
3:1, and 3:2:1. The output frequency relationship is controlled by the
fsel frequency control pins. The fsel pins and other inputs are
LVCMOS/LVTTL compatible inputs.
The PI6C2952 uses external feedback to the PLL. This features
allows the device to be used as a “zero delay” buffer. Any of the
eleven outputs can be used as feedback to the PLL. To optimize PLL
stability and jitter performance,the VCO_Sel pin allows for the
choice of two VCO ranges. For board level test, the MR/OE pin
allows a user to force the outputs into high impedance. For system
debug, the PI6C2952’s PLL can be bypassed. When forced to a logic
HIGH, the PL_LEN input routes the signal on the RefClk input
around the PLL directly to the internal dividers. Because the signal
is routed through the dividers, it may take several transitions of the
RefClk to affect a transition on the outputs. This features allows a
designer to single step the design for debug purposes.
The PI6C2952’s outputs are LVCMOS which are optimally designed
to drive terminated transmission lines. For applications using series-
terminated transmission lines, each PI6C2952 output can drive two
lines. This capability provides an effective fanout of 22, more than
enough clocks for most clock tree designs.
Features
• ±100ps Cycle-to-Cycle Jitter
• Fully Integrated PLL
• Output Frequency up to 180MHz
• High-Impedance Disabled Outputs
• Compatible with PowerPC, Intel, and High-Performance
RISC Microprocessors
• Configurable Output Frequency
• 32-Pin LQFP Package (FB)
PinConfiguration
Low Voltage PLL Clock Driver
24 23 22 21 20 19 18 17
1
2 3 4
5
6 7 8
16
15
14
13
12
11
10
9
25
26
27
28
29
30
31
32
VCCO
Qb2
Qb3
GNDO
GNDO
Qc0
Qc1
VCCO
VCCO
Qa2
Qa1
GNDO
Qa0
VCCI
VCCA
PLL_En
32-Pin
FB


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