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参数资料
| 型号： | ZL30108LDG1 |
| 厂商： | XILINX INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, QCC32 |
| 封装： | 5 X 5 MM, 0.90 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, MO-220, QFN-32 |
| 文件页数： | 42/57页 |
| 文件大小： | 691K |
| 代理商： | ZL30108LDG1 |
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ZL30108
Data Sheet
20
Zarlink Semiconductor Inc.
7.3
Power Up Sequence
The ZL30108 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)
7.4
Reset Circuit
A simple power up reset circuit with about a 60
μs reset low time is shown in Figure 12. Resistor R
P 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 12 - Power-Up Reset Circuit
+3.3 V
RST
RP
1 k
Ω
C
10 nF
R
10 k
Ω
ZL30108
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| ZL30109 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:DS1/E1 System Synchronizer with 19.44 MHz Output |
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