ICS9220B

Programmable Rambus

13

Measurement

Differential Driver

Point

Measurement

Point

Swing Current

Control

ISET

ODCLK_T

ODCLK_C

t

F

80%

V(t)

20%

t

R

V

H

V

L

Figure 3. Input and Output Voltage Waveforms

Vx,nom

Vx+

Vx-

ODCLK_T

ODCLK_C

Figure 4. Crossing-point Voltage

Input Clock Signal

The ICS9220 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

Characteristics – Inputs table.

Figure 2. Example System Clock Driver Equivalent Circuit