ICS9214 데이터 시트보기 (PDF) - Integrated Circuit Systems

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ICS9214

Rambus™ XDR™ Clock Generator

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS9214

Input Clock Signal

The ICS9214 receives either a differential or single-ended reference clock (CLK_INT/C). When the reference input clock is

from a differential clock source, it must meet the voltage levels and timing requirements listed in the DC Characteristics –

Inputs and AC Characteristics – Inputs tables.

For a singled-ended clock input, an external voltage divider and a supply voltage, as shown in Figure 2, provide a reference

voltage VTH at the CLK_INC pin to determine the proper switching point for CLK_INT. The range of VTH is specified in the DC

Characteristics – Inputs table.

Swing Current

Control

ISET

RRC

ODCLK_T

Differential Driver

ODCLK_C

VTS

R1

R2

Measurement

Point

ZCH

R3

VTS Measurement

Point

R1

R2

ZCH

R3

VT

RT

VT

RT

V(t)

Figure 2. Example System Clock Driver Equivalent Circuit

tF

tR

VH

80%

20%

VL

ODCLK_T

ODCLK_C

Figure 3. Input and Output Voltage Waveforms

Figure 4. Crossing-point Voltage

Vx+

Vx,nom

Vx-

0809D—04/07/06

12

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