MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 207

• Manufacturer Part Number: MC145572PB
• Manufacturer: Freescale Semiconductor

Specifications of MC145572PB

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Not Compliant

MOTOROLA
B.3.1
B.4
Pullable Crystal Specification for ISDN and Network Applications
1. Operating frequency:
2. Crystal shunt capacitance:
3. Uncertainty at rated C L :
4. Equivalent series resistance:
5. Crystal pull range:
6. Calibration load capacitance:
NOTES:
CRYSTAL SOURCES
Table B–3 lists sourcing information for the crystals used in the MC145572.
1. – 40 to + 85 C required for transmission applications.
2. For room temperature, use 0 to 70 C.
3. Explanation of item 5, crystal pull range. Crystal pullability must be specified to allow the MC145572 to lock to either a re-
a.
b.
c.
ceived signal when operating in NT mode or lock to the 8 kHz FREQREF when operating in LT mode. The appropriate crystal
pullability specification is dependent of the maximum expected signal or FREQREF tolerance in ppm. This will vary depend-
ing on national network and application requirements. For example in North America, receive signals from the network are
expected to have a tolerance of less than 5 ppm. Hence, a crystal with either 200 or 260 ppm total pullability may be used.
The ultimate choice is up to the equipment designer.
5 ppm signal
32 ppm signal
50 ppm signal
Freescale Semiconductor, Inc.
For More Information On This Product,
NOTE: See Caution note on page B–1.
ECLIPTEK
Hy–Q International
SaRonix
Connor–Winfield
Precision Devices
Manufacturer
Go to: www.freescale.com
Table B–3. Crystal Vendors
MC145572
20.48 MHz
C o = 7.0 pF
R S
200 ppm minimum pullability over a C L range of 15 to 45 pF
260 ppm minimum pullability over a C L range of 15 to 45 pF
300 ppm minimum pullability over a C L range of 15 to 45 pF
24 pF
50 ppm over temperature, calibration, and 10–year aging
Contact Phone No.
(714) 433–1200
(606) 283–5000
(415) 856–6900
(708) 851–4722
(608) 831–4445
20 ohms @ 1 mW drive
Contact Fax No.
(714) 433–1234
(606) 283–0883
(415) 856–4732
(708) 851–5040
(608) 831–3343
B–3