PI6C557-05 Datasheet, PDF (1/9 Pages) Pericom Semiconductor Corporation – PCIe 2.0 Clock Generator with 4 HCSL Outputs

PI6C557-05
PCIe® 2.0 Clock Generator with 4 HCSL Outputs
Product Features
ÎÎPCIe® 2.0 complaint
→Phase jitter - 2.1ps RMS (typ)
ÎÎLVDS compatible outputs
ÎÎSupply voltage of 3.3V ±5%
ÎÎ25MHz crystal or clock input frequency
ÎÎHCSL outputs, 0.7V Current mode differential pair
ÎÎJitter 40ps cycle-to-cycle (typ)
ÎÎSpread of -0.5%, -1.0%, -1.5%, and no spread
ÎÎIndustrial temperature range
ÎÎSpread Bypass option available
ÎÎSpread and frequency selection via external pins
ÎÎPackaging: (Pb-free and Green)
→20-pin, 173-mil wide TSSOP
Description
The PI6C557-05 is a spread spectrum clock generator compliant
to PCI Express® 2.0 and Ethernet requirements. The device is
used for PC or embedded systems to substantially reduce Elec-
tromagnetic Interference (EMI).
The PI6C557-05 provides four differential (HCSL) or LVDS
spread spectrum outputs. The PI6C557-05 is configured to select
spread and clock selection. Using Pericom's patented Phase-
Locked Loop (PLL) techniques, the device takes a 25MHz crys-
tal input and produces four pairs of differential outputs (HCSL)
at 100MHz and 200MHz clock frequencies. It also provides
spread selection of -0.5%, -1.0%, -1.5%, and no spread.
Block Diagram
Pin Configuration
VDD PD OE
2
S[2:0] ³
Spread
Spectrum/
Output
clock
selection
SS Circuitry
25 MHz^X1/CLK
crystal
or clock _X2
Crystal
Driver
PCualpliancgitors
PLL
2
GND
Rr(IREF)
CLK0
CLK0
CLK1
CLK1
CLK2
CLK2
CLK3
CLK3
VDDXD
1
S0
2
S1
3
S2
4
X1
5
X2
6
PD
7
OE
8
GNDXD
9
IREF
10
20
CLK0
19
CLK0
18
CLK1
17
CLK1
16
GNDODA
15
VDDODA
14
CLK2
13
CLK2
12
CLK3
11
CLK3
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11-0063
1
www.pericom.com
P-0.1
04/29/11