5L35021 Datasheet

21

©2017-2025 Renesas Electronics Corporation

December 15, 2025

If using an input of 3.3V or 2.5V or 1.8V to drive the part, a voltage divider configuration like this is needed:

Figure 8. LVCMOS Driver to XTAL Input Interface

Driving XIN with an LVPECL Driver

Figure x. shows an example of the interface diagram for a +3.3V LVPECL driver. This is a standard LVPECL termination with one side of

the driver feeding the CLKINB/X1 input. It is recommended that all components in the schematics be placed in the layout; though some

components might not be used, they can be utilized for debugging purposes. The datasheet specifications are characterized and

guaranteed by using a quartz crystal as the input. If the driver is 2.5V LVPECL, the only change necessary is to use the appropriate value

of R3.

Figure 9. Overdriving XIN with an LVPECL Driver

CLKIN is able to accept both LVDS and LVPECL input signals as it is internally AC coupled. However, occasionally, it is desired to have

CLKIN to take CMOS levels. This is achieved by using the same configuration as shown in Figure 8, without the C3 capacitor.

Table 29. Nominal Voltage Divider Values for Overdriving XIN with Single-ended Driver

LVCMOS Driver

VDD

Ro+Rs

R1

R2

V_XIN

R0+R1+R2

3.3

50.0

130

75

0.97

255

2.5

50.0

100

100

1.00

250

1.8

50.0

62

130

0.97

242