PI6C557-03 Datasheet, PDF (1/8 Pages) Pericom Semiconductor Corporation – PCI Express Clock

Product Features
ÎÎLVDS compatible outputs
ÎÎSupply voltage of 3.3V ±10%
ÎÎ25MHz input frequency
ÎÎHCSL outputs, 0.7V Current mode differential pair
ÎÎJitter 60ps cycle-to-cycle (typ)
ÎÎSpread of ±0.25%, -0.5%, -0.75%, and no spread
ÎÎIndustrial temperature range
ÎÎPackaging: (Pb-free and Green)
àà 16-pin, 173 mils wide TSSOP
PI6C557-03
PCI Express Clock
Description
The PI6C557-03 is a spread spectrum clock generator
supporting PCI Express and Ethernet requirements. The device
is used for PC or embedded systems to substantially reduce
Electromagnetic Interference (EMI).
The PI6C557-03 provides two differential (HCSL) spread spectrum
outputs. The PI6C557-03 is configured to select 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 ±0.25%, -0.5%, -0.75%, and no spread.
Block Diagram
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
Pin Configuration
11-0060
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
1
www.pericom.com
04/29/11