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ZL30105 Datasheet(PDF) 33 Page - Zarlink Semiconductor Inc

Part No. ZL30105
Description  T1/E1/SDH Stratum 3 Redundant System Clock Synchonizer for AdvancedTCA and H.110
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Maker  ZARLINK [Zarlink Semiconductor Inc]
Homepage  http://www.zarlink.com
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ZL30105 Datasheet(HTML) 33 Page - Zarlink Semiconductor Inc

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ZL30105
Data Sheet
33
Zarlink Semiconductor Inc.
Figure 22 - Crystal Oscillator Circuit
5.3
Power Up Sequence
The ZL30105 requires that the 3.3 V is not powered after the 1.8 V. This is to prevent the risk of latch-up due to the
presence of parasitic diodes in the IO pads.
Two options are given:
1. Power-up 3.3 V first, 1.8 V later
2. Power up 3.3 V and 1.8 V simultaneously ensuring that the 3.3 V power is never lower than 1.8 V minus a few
hundred millivolts (e.g., by using a schottky diode or controlled slew rate)
5.4
Reset Circuit
A simple power up reset circuit with about a 300 µs reset low time is shown in Figure 23. Resistor RP is for
protection only and limits current into the RST pin during power down conditions. The reset low time is not critical
but should be greater than 300 ns.
Figure 23 - Power-Up Reset Circuit
OSCo
1 M
20 MHz
ZL30105
OSCi
100
1
µH
The 100
Ω resistor and the 1 µH inductor may improve
stability and are optional.
+3.3 V
RST
RP
1 k
C
10 nF
R
10 k
ZL30105


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