PI6C557-03B Datasheet, PDF (1/9 Pages) Pericom Semiconductor Corporation – PCIe® 3.0 Clock Generator with 2 HCSL Outputs

PI6C557-03B
PCIe® 3.0 Clock Generator with 2 HCSL Outputs
Features
ÎÎPCIe® 3.0 compliant
àà PCIe 3.0 Phase jitter - 0.45ps RMS (High Freq. Typ.)
ÎÎLVDS compatible outputs
ÎÎSupply voltage of 3.3V ±10%
ÎÎ25MHz crystal or clock input frequency
ÎÎHCSL outputs, 0.8V Current mode differential pair
ÎÎJitter 35ps cycle-to-cycle (typ)
ÎÎSpread of -0.5%, -0.75%, and no spread
ÎÎIndustrial temperature range
ÎÎSpread Bypass option available
ÎÎSpread and frequency selection via external pins
ÎÎPackaging: (Pb-free and Green)
àà 16-pin TSSOP (L16)
àà 16-pin QSOP (Q16)
Description
The PI6C557-03B is a spread spectrum clock generator compli-
ant to PCI Express® 3.0 and Ethernet requirements. The device is
used for PC or embedded systems to substantially reduce Electro-
magnetic Interference (EMI).
The PI6C557-03B provides two differential (HCSL) or LVDS
spread spectrum outputs. The PI6C557-03B is configured 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 differential outputs (HCSL) at
25MHz, 100MHz, 125MHz and 200MHz clock frequencies. It
also provides spread selection of -0.5%, -0.75%, and no spread.
Block Diagram
Pin Configuration (16-Pin TSSOP)
SS1:SS0
2
S1:S0
2
X1/CLK
25 MHz
crystal or clock _X2
Pulling
Capacitors
VDD
2
Control
Logic
Phase
Lock
Loop
Crystal
Driver
2
GND
R_R
OE
CLK0
CLK0
CLK1
CLK1
S0 1
S1 2
SS0 3
X1/CLK 4
X2 5
OE 6
GNDX 7
SS1 8
16 VDDX
15 CLK0
14 CLK0
13 GNDA
12 VDDA
11 CLK1
10 CLK1
9 IREF
All trademarks are property of their respective owners.
11-0062
1
www.pericom.com
PI6C557-03B
P-0.1
04/29/11