![](http://datasheet.mmic.net.cn/Pericom/PI6C557-03LE_datasheet_102056/PI6C557-03LE_7.png)
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
FIN
Input Frequency
25
MHz
VOUT
Output Frequency
25
200
MHz
VOH
Output High Voltage (1,2)
@VDD = 3.3V
660
700
850
mV
VOL
Output Low Voltage(1,2)
-150
0
mV
VCPA
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
MF
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
TR/T
Rise/Fall Time Variation(1,2)
125
ps
TSKEW
Skew between outputs
VDD/2
50
ps
TDUTY-
CYCLE
Duty Cycle(1,3)
45
55
%
TOE
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
tSPREAD
Setting period after spread change
3.0
ms
Ferror
Synthesizer Error
PLL locked, xtal load is matched and
SSC off
0
ppm
Notes:
1. RL = 50 with CL = 2 pF and RR = 475Ω
2. Single-ended waveform
3. Differential waveform
4. Measured at the crossing point
5. CLK pins are tri-stated when OE is LOW
Thermal Characteristics
Symbol Parameter
Conditions
Min.
Typ.
Max.
Unit
θJA
Thermal Resistance Junction to Ambient
Still air
90
°C/W
θJC
Thermal Resistance Junction to Case
24
°C/W
Recomended Crystal Specification
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
12-0307