FUJITSU MB15C02 - Manual (Page 10)

10
MB15C02
(b) Charge pump
The charge pump is available in two forms: internal external.
Internal charge pump output (Do)
External charge pump outputs (
φ
R,
φ
P)
(c) Phase comparator input/output waveforms
The phase comparator outputs logic levels summarized in Table 1, according to the phase error between fr
and fp. Note that
φ P is an Nch open drain output. The pulse width of the phase comparator outputs are identical
and equal to the phase error between fr and fp as shown in Figure 1.
Figure 1. Phase comparator input/output waveform
fp
fr
When FC = “L”
When FC = “H”
Do
Do
High Z
High Z
φ R
φ P
φ
R
φ
P
High Z
High Z
High Z : High impedance state
fp : Nch open output