參數(shù)資料
型號: NB3N3010BDR2G
廠商: ON Semiconductor
文件頁數(shù): 5/9頁
文件大?。?/td> 0K
描述: IC CLOCK GENERATOR PLL 8SOIC
標(biāo)準(zhǔn)包裝: 2,500
類型: 時鐘/頻率發(fā)生器
PLL:
主要目的: USB 應(yīng)用
輸入: 時鐘
輸出: LVCMOS
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 無/無
頻率 - 最大: 12.288MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOICN
包裝: 帶卷 (TR)
NB3N3010B
http://onsemi.com
5
APPLICATION INFORMATION
Figure 1 shows the simplified block diagram of the
NB3N3010B device.
The primary function of the NB3N3010B is to accept a
selectable 4 kHz or 8 kHz input reference clock, REF, and
then multiply it to 12.288 MHz output frequency.
Frequency Select SO
Either of two expected input REF frequencies, 4 kHz or
8 kHz, will be multiplied by the FLL to achieve 12.288 MHz
at the lowskew CLKA and CLKB outputs by selecting the
S0 pin; see Table 6.
The pulse high time (THI) of the input reference signal may
vary widely depending on the application. See AC
specifications for details.
Output Enable ENABLEn
A Low active output enable input pin, ENABLEn, is
provided. When the ENABLEn input is High inactive, both
clock outputs are driven to a logic Low.
The NB3N3010B implements a delay, specified as
ENABLEn to Output Delay in the AC Specifications, from
the assertion of ENABLEn to the first rising edges on the
clock outputs. This delay insures that CLKA and CLKB
output pulses are within specification before the output
drivers are enabled. When ENABLEn transitions from Low
to High (deasserts), the current cycle of the clock outputs
completes normally then the outputs will be held Low. The
ENABLEn signal is asynchronous to either the REF input or
CLK_x outputs.
Table 6. INPUT FREQUENCY SELECT AND OUTPUT ENABLE FUNCTIONS
ENABLEn*
S0*
fREF
FLL Multiplier
CLKA & CLKB Frequency
0
L
4 kHz
3072
12.288 MHz
0
H
8 kHz
1536
12.288 MHz
1
x
Disabled Low
*Defaults High when left open.
Typical Power On Sequence
1. Power On
2. Reference Clock present; must be switching before ENABLEn goes High.
3. Output Enable, ENABLEn, HightoLow
Figure 3. ENABLEn Timing Diagram
VDD Valid to ENABLEn
~50 ms, typ
ENABLEn to Output
400 Clock Cycles @ 8 kHz
200 Clock Cycles @ 4 kHz
VDD Valid
VDD
ENABLEn
REF
CLKA/B
Completed Clock
Outputs
Then Low
4 kHz or
8 kHz
12.288 MHz
Outputs Enabled
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