Datasheet > 40002A01

40002A01

更新时间： 2022-09-19 00:08:56

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
12页	197K
描述
FEMTOCLOCKS? CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

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40002A01 数据手册

ICS840002-01

FEMTOCLOCKS™ CRYSTAL-TO-

LVCMOS/LVTTL FREQUENCY SYNTHESIZER

Integrated

Circuit

Systems, Inc.

RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS

INPUTS:

CRYSTAL INPUT:

OUTPUTS:

LVCMOS OUTPUT:

For applications not requiring the use of the crystal oscillator All unused LVCMOS output can be left floating. We

input, both XTAL_IN and XTAL_OUT can be left floating. recommend that there is no trace attached.

Though not required, but for additional protection, a 1kΩ

resistor can be tied from XTAL_IN to ground.

TEST_CLK I^NPUT:

For applications not requiring the use of the test clock, it can

be left floating. Though not required, but for additional

protection, a 1kΩ resistor can be tied from the TEST_CLK to

ground.

LVCMOS C^ONTROLPINS:

All control pins have internal pull-ups or pull-downs; additional

resistance is not required but can be added for additional

protection. A 1kΩ resistor can be used.

LAYOUT GUIDELINE

C2=22pF are recommended for frequency accuracy. For differ-

ent board layout, the C1 and C2 may be slightly adjusted for

optimizing frequency accuracy. 1KΩ pullup or pulldown resis-

tors can be used for the logic control input pins.

Figure 3 shows a schematic example of the ICS840002-01. An

example of LVCMOS termination is shown in this schematic.

Additional LVCMOS termination approaches are shown in the

LVCMOS Termination Application Note. In this example, an 18

pF parallel resonant 25MHz crystal is used.The C1=22pF and

Logic Control Input Examples

Set Logic

Input to

'1'

Set Logic

Input to

'0'

VDD

Zo = 50 Ohm

RU1

RU2

Not Install

VDD

To Logic

Input

pins

To Logic

Input

pins

LVCMOS

RD1

Not Install

RD2

FSEL0

XTAL_SEL

TEST_CLK

nPLL_SEL

VDDA

FSEL1

GND

VDDO

XTAL_IN

XTAL_OUT

VDD

VDDA

VDD

10uF

100

0.01u

0.1u

Zo = 50 Ohm

0.1u

ICS840002-01

100

XTAL2

If not using the crystal input, it can be left floating.

For additional protection the XTAL_IN pin can be

tied to ground.

LVCMOS

22pF

XTAL1

Optional Termination

22pF

Unused output can be left floating. There should

no trace attached to unused output. Device

characterized with all outputs terminated.

FIGURE 3. ICS840002-01 SCHEMATIC EXAMPLE

840002AG-01

www.icst.com/products/hiperclocks.html

REV.B JANUARY 13, 2006

1...5 6 789 10 11 12

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