参数资料
型号: PEF3452
厂商: INFINEON TECHNOLOGIES AG
英文描述: Line Interface Unit for DS3, STS 1 and E3
中文描述: 线路接口单元的DS3中,STS 1和E3
文件页数: 20/71页
文件大小: 1372K
代理商: PEF3452
PEF 3452
TE3-LIU V1.3
Pin Descriptions
Preliminary Data Sheet
10
2001-12-05
PRELIMINARY
Global Clock Reference
29
REFCLK
I
Reference Clock
REFCLK is the basic internal clock. It must
be stable during reset and operation.
This clock is also used to synchronize the
receive PLL in case of no signal.
The clock frequency depends on the target
application:
DS3: 44.736 MHz
STS-1: 51.840 MHz
E3: 34.368 MHz
To fulfill e.g., ITU-T G.832 a clock accuracy
of 20 ppm is required.
J
itter Attenuation Reference
Connection for an external pullable crystal.
DS3:
14.912 MHz
STS-1: 17.280 MHz
E3:
11.456 MHz
39
38
XTAL1
XTAL2
I
O
If jitter attenuation is disabled (default),
XTAL1 is internally driven to a fixed level
(not floating).
Table 1
Pin No.
Interface Pin Functions
(cont’d)
Symbol
Input
(
I
)
Output
(
O
)
Supply
(
S
)
Function
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