
7
PI6C557-03
PCI Express Clock
www.pericom.com 01/04/13
AC Characteristics (VDD = 3.3V ±10%, TA = -40°C to +85oC)
Symbol Parameter Conditions Min. Typ. Max. Unit
F
Input Frequency 25 MHz
VOUT Output Frequency 25 200 MHz
VOH Output High Voltage (1,2) @VDD = 3.3V 660 700 850 mV
V
Output Low Voltage(1,2) -150 0 mV
V
Crossing Point Voltage(1,2) Absolute 250 350 550 mV
VCN Crossing Point Voltage(1,2,4) Variation over all edges 140 mV
JCC Jitter, Cycle-to-Cycle(1,3) 60 100 ps
Modulation Frequency Spread Spectrum 30 31.5 33 kHz
tOR Rise Time(1,2) From 0.175V to 0.525V 175 332 700 ps
tOF Fall Time(1,2) From 0.525V to 0.175V 175 344 700 ps
T
/∆T Rise/Fall Time Variation(1,2) 125 ps
T
Skew between outputs VDD/2 50 ps
TDU TY-
Duty Cycle(1,3) 45 55 %
T
Output Enable Time(5) All outputs 0.1 μs
TOT Output Disable Time(5) All outputs 0.1 μs
tSTABLE From power-up to VDD=3.3V 1.6 3.0 ms
t
Setting period aer spread change 3.0 ms
Ferror Synthesizer Error PLL locked, xtal load is matched and
SSC o 0ppm
Notes:
1. RL = 50Ω with CL = 2 pF and RR = 475Ω
2. Single-ended waveform
3. Dierential waveform
4. Measured at the crossing point
5. CLK pins are tri-stated when OE is LOW
ermal Characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
θJA ermal Resistance Junction to Ambient Still air 90 °C/W
θ
ermal Resistance Junction to Case 24 °C/W
Recomended Crystal Specication
Pericom recommends:
a) GC2500003 XTAL 49S/SMD(4.0 mm), 25M, CL=18pF, +/-30ppm
http://www.pericom.com/pdf/datasheets/se/GC_GF.pdf
b) FY2500081, SMD 5x3.2(4P), 25M, CL=18pF, +/-30ppm
http://www.pericom.com/pdf/datasheets/se/FY_F9.pdf
c) FL2500047, SMD 3.2x2.5(4P), 25M, CL=18pF, +/-20ppm
http://www.pericom.com/pdf/datasheets/se/FL.pdf