參數(shù)資料
型號: ICS1524MT
英文描述: Dual Output Phase Controlled SSTL-3/PECL Clock Generator
中文描述: 雙輸出相控SSTL-3/PECL時鐘發(fā)生器
文件頁數(shù): 16/24頁
文件大小: 394K
代理商: ICS1524MT
ICS1524
16
ICS1524 Rev C 01/31/2003
PECL Outputs
For information on using the ICS1524’s PECL output pins, please refer to Application Note 4: Designing a Custom
PECL Interface for the ICS1523
SSTL_3 Outputs
Unterminated Outputs
In the
ICS1524, unterminated SSTL_3 output pins display exponential transitions similar to those of rectangular
pulses presented to RC loads. The 10-90% rise time is typically 1.6 ns, and the corresponding fall time is typically
700 ps. In turn, this asymmetry contributes to duty cycle asymmetry at higher output frequencies. In the absence of
significant load capacitance (which can further increase rise and fall time), this asymmetry is the dominant factor
determining high-frequency performance of these single-ended outputs. Typically, no termination is required either
for the LOCK/REF, FUNC, and CLK/2 outputs or for CLK outputs up to approximately 135 MHz.
Terminated Outputs
SSTL_3 outputs are intended to terminate in low impedances to reduce the effect of external circuit capacitance.
Use of transmission line techniques enables use of longer traces between source and driver without increasing ring-
ing due to reflections. Where external capacitance is minimal and substantial voltage swing is required to meet
LVTTL V
IH
and V
OL
requirements, the intrinsic rise and fall times of ICS1524 SSTL outputs are only slightly improved
by termination in a low impedance.
The ICS1524 SSTL output source impedance is typically less than 60 Ohms. Termination impedance of 100 Ohms
reduces output swing by less than 30% which is more than enough to drive a single load of LVTTL inputs.
For more information on using the ICS1524’s SSTL output pins, please refer to Application Note 3: Using SSTL_3
Outputs with CMOS or LVTTL Inputs
ICS1524
VDD
SSTL-3 Output
330
150
Single
LVTTL
Load
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