MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 206

• 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

B–2
B.3
NOTES:
MC145572 CRYSTAL SPECIFICATION
The MC145572 requires a pullable crystal because it has an on–chip VCXO. The same specification
can be used for both the NT and LT mode. The specification assumes network timing tolerance of
The 200 ppm pullability spec has the following components:
Operating Temperature
Breakdown Voltage Vac (t = 1 s)
Surge Voltage per Bellcore
TR–NWT–001089 Issue 1, Table 4–2
DC Insulation Resistance (500 Vdc)
DC Resistance (T = 25 C) (Valhalla 4100)
Transformation Ratio (0.1 Vac, 20 kHz)
(Waynekerr 3245)
Inductance at 0.1 Vac, 10 kHz, and 0.0 Adc or
0.08 Adc (Waynekerr 3245)
Leakage Inductance at 0.01 Vac, 100 kHz
Total Harmonic Distortion at 80 mA Winding
Current, 4 V pk–pk
(Measured Between 500 Hz and 100 kHz)
Peak Winding Current
5 ppm. The total pullability has been reduced from 360 ppm to 200 ppm.
1. European countries may have significantly higher requirements.
2. DC winding resistance should be kept as low as possible since it can change by
3. Operating point on B–H curve should be well below the ‘knee’, i.e., no saturation.
4. Since European ISDN power feeding and pair gain currents are greater, the value should be increased to 60 mA for
2 x 50 ppm, total crystal tolerance
2 x 5 ppm, reference signal
Compensation for PCB and device capacitance
– 40 to + 85 C. If the dc winding resistance is low with respect to the value of the series resistors connected between
the Tx pins and the transformer, a change in temperature will have a lower effect on the output pulse amplitude than
if the transformer dc winding resistance is a relatively high value and the series resistors have a lower value.
such applications.
Table B–2. Electrical Specification for the U–Interface Transformer,
Parameter
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure B–1. Schematic Reference for
Go to: www.freescale.com
U–Interface Transformer
MC145572
North American ISDN
Each winding to all others
and core
Each winding to all others
and core
Each winding to all others
and core
(1 – 12)
(2 – 11)
(7 – 5)
(1 – 12):(2 – 11)
(1 – 12:7 – 5)
(1 – 11) strap (2 – 12)
(7 – 5) strap
(1 – 12) (2 – 11)
(7 – 5):(1 – 11) strap
(12 – 2)
(1 – 11) strap (2 – 12)
LINE
SIDE
12
11
1
2
Pins Under Test
Total
1.25:1
MC145572
SIDE
=
=
=
=
6
7
5
100 ppm
200 ppm
10 ppm
90 ppm
0.615
1500
2500
– 40
0.99
26.5
Min
500
20
—
—
1
1
1
25% over the temperature range of
0.635
Max
+ 85
1.01
29.5
20.0
– 55
—
—
—
—
6
6
9
mA dc
Unit
Vdc
Vac
M
mH
dB
—
MOTOROLA
C
H
Notes
1
1
2
3
4