Fujitsu MB15C02 Datasheet page 10

MB15C02
(b) Charge pump
The charge pump is available in two forms: internal external.
Internal charge pump output (Do)
External charge pump outputs (φR, φP)
(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 φP 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.
fr
fp
When FC = "L"
Do
φR
φP
When FC = "H"
Do
φR
φP
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Figure 1. Phase comparator input/output waveform
High Z
High Z
High Z
High Z
High Z : High impedance state
fp : Nch open output