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www.pericom.com P-0.1 04/29/11 All trademarks are property of their respective owners.
PI6C557-03B
Block Diagram
Phase
Lock
Loop
Crystal
Driver
VDD
GND
X1/CLK
X2
25 MHz
crystal or clock
Control
Logic
SS1:SS0
2
S1:S0
2
CLK0
CLK0
R
R
CLK1
CLK1
2
2
OE
Pulling
Capacitors
Pin Configuration (16-Pin TSSOP)
S0
S1
SS0
X1/CLK
X2
OE
GNDX
SS1
VDDX
CLK0
CLK0
GNDA
VDDA
CLK1
CLK1
IREF
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
PI6C557-03B
Description
e PI6C557-03B is a spread spectrum clock generator compli-
ant to PCI Express® 3.0 and Ethernet requirements. e device is
used for PC or embedded systems to substantially reduce Electro-
magnetic Interference (EMI).
e PI6C557-03B provides two dierential (HCSL) or LVDS
spread spectrum outputs. e PI6C557-03B is congured to se-
lect spread and clock selection. Using Pericom's patented Phase-
Locked Loop (PLL) techniques, the device takes a 25MHz crystal
input and produces two pairs of dierential outputs (HCSL) at
25MHz, 100MHz, 125MHz and 200MHz clock frequencies. It
also provides spread selection of -0.5%, -0.75%, and no spread.
Features
Î PCIe® 3.0 compliant
à PCIe 3.0 Phase jitter - 0.45ps RMS (High Freq. Typ.)
Î LVDS compatible outputs
Î Supply voltage of 3.3V ±10%
Î 25MHz crystal or clock input frequency
Î HCSL outputs, 0.8V Current mode dierential pair
Î Jitter 35ps cycle-to-cycle (typ)
Î Spread of -0.5%, -0.75%, and no spread
Î Industrial temperature range
Î Spread Bypass option available
Î Spread and frequency selection via external pins
Î Packaging: (Pb-free and Green)
à 16-pin TSSOP (L16)
à 16-pin QSOP (Q16)
PCIe® 3.0 Clock Generator with 2 HCSL Outputs
11-0062
