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參數(shù)資料
| 型號： | MT9040 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | T1/E1 Synchronizer |
| 中文描述： | 的T1/E1同步 |
| 文件頁數(shù)： | 12/27頁 |
| 文件大?。?/td> | 424K |
| 代理商： | MT9040 |
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MT9040
Data Sheet
12
Zarlink Semiconductor Inc.
Reset Circuit
A simple power up reset circuit with about a 50us reset low time is shown in Figure 7. 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 300ns.
Figure 7 - Power-Up Reset Circuit
Lock Indicator
The LOCK pin toggles at a random rate when the PLL is frequency locked to the input reference. In Figure 8 the
RC-time-constant circuit can be used to hold the high state of the LOCK pin.
Once the PLL is frequency locked to the input reference, the minimum duration of LOCK pin’s high state would be
32ms and the maximum duration of LOCK pin’s low state would not exceed 1 second. The following equations can
be used to calculate the charge and discharge times of the capacitor.
t
C
= - R
D
C ln(1 – V
T+
/V
DD
) = 240
μ
s
t
C
= Capacitor’s charge time
R
D
= Dynamic resistance of the diode (100
)
C = Capacitor value (1
μ
F)
V
T+
= Positive going threshold voltage of the
Schmitt Trigger (3.0 V)
V
DD
= 3.3 V
t
D
= - R C ln(V
T-
/V
DD
) = 1.65 seconds
t
D
= Capacitor’s discharge time
R = Resistor value (3.3 M
)
C = Capacitor value (1
μ
F)
V
T-
= Negative going threshold voltage of the
Schmitt Trigger (2.0 V)
V
DD
= 3.3 V
+3.3V
RST
R
P
1k
C
10nF
R
10k
MT9040
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT9040AN | T1/E1 Synchronizer |
| MT9043 | T1/E1 System Synchronizer |
| MT9043AN | T1/E1 System Synchronizer |
| MT9043AN48PINSSOP | T1/E1 System Synchronizer |
| MT9045 | T1/E1/OC3 System Synchronizer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT90401 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:SONET/SDH Clock Multiplier PLL |
| MT90401AB | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:SONET/SDH System Synchronizer |
| MT90401AB1 | 制造商:Microsemi Corporation 功能描述:FRAMER SDH/SONET 3.3V 80LQFP EP - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SYNCHRONIZER SONET/SDH 80LQFP 制造商:Microsemi Corporation 功能描述:IC SYNCHRONIZER SONET/SDH 80LQFP |
| MT9040AN | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 Synchronizer |
| MT9040AN1 | 制造商:Microsemi Corporation 功能描述:FRAMER E1 /T1 3.3V 48SSOP - Rail/Tube |
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