PI6C557-05B Datasheet, PDF (1/8 Pages) Pericom Semiconductor Corporation – PCIe 3.0 Clock Generator with 4 HCSL Outputs

PI6C557-05B
PCIe® 3.0 Clock Generator with 4 HCSL Outputs
Product Features
• PCIe® 3.0 complaint
→PCIe 3.0 Phase jitter: 0.48ps RMS (High Freq. Typ.)
• LVDS compatible outputs
• Supply voltage of 3.3V ±5%
• 25MHz crystal or clock input frequency
• HCSL outputs, 0.7V Current mode differential pair
• Jitter 40ps cycle-to-cycle (typ)
• Spread of -0.5%, -1.0%, -1.5%, and no spread
• Industrial temperature range
• Spread Bypass option available
• Spread and frequency selection via external pins
• Packaging: (Pb-free and Green)
→20-pin, 173-mil wide TSSOP
Description
The PI6C557-05B is a spread spectrum clock generator compliant
to PCI Express® 3.0 and Ethernet requirements. The device is used
for PC or embedded systems to substantially reduce Electromagnetic
Interference (EMI).
The PI6C557-05B provides four differential (HCSL) or LVDS
spread spectrum outputs. The PI6C557-05B 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 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
All trademarks are property of their respective owners.
11-0064
1
www.pericom.com
P-0.1
04/29/11