T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
21 Crystal Characteristics
Table 123. Fundamental Mode Crystal Characteristics
These are the characteristics of a parallel resonant crystal for meeting the ±100 ppm requirements of T1.601 for
NT operation. The parasitic capacitance of the PC board to which the T9000 crystal is mounted must be kept within
the range of 0.6 pF ± 0.4 pF.
Parameter
Center Frequency
Symbol
FO
Test Conditions
With 25.0 pF of loading
—
Specifications
15.36
Unit
MHz
ppm
Tolerance Including Calibration, Tempera-
ture Stability, and Aging
TOL
±70
Drive Level
DL
RS
CO
CM
Maximum
Maximum
—
0.5
20
mW
Ω
Series Resistance
Shunt Capacitance
Motional Capacitance
3.0 ± 20%
12 ± 20%
pF
fF
—
Table 124. Internal PLL Characteristics
Parameter
Total Pull Range
Test Conditions
Min
Typ
Max
Unit
—
±250
—
—
ppm
Jitter Transfer Function
–3 dB point (LT)
–3 dB point (NT), 18 kft 26 AWG
—
—
0.45*
5*
—
—
Hz
Hz
Jitter Peaking
at 0.15 Hz typical (LT)
at 1.5 Hz typical (NT)
—
—
0.4*
1.0*
—
—
dB
dB
* Set by digital PLL; therefore, variations track MTC (LT mode) or U-interface line rate (NT mode).
22 Timing Characteristics
Table 125. MTC (Master Timing Clock) Requirements and Characteristics* (LT Mode)
Parameter
MTC Clock Period
Min
Typ
125
—
Max
Unit
125 – 32 ppm
125 + 32 ppm
µs
MCLKs
ns
MTC High/Low Time
MTC Rise/Fall Time
MTC Jitter
8
—
60
—
—
—
UI†
—
0.259
* To meet ANSI T1.601-1992, see not for Recommended Operating Conditions.
† One UI = 12.5 µs.
Lucent Technologies Inc.
113
AGERE [ AGERE SYSTEMS ]
