PC87365 datasheet(207/215 Pages) NSC

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Giải thích chi tiết về linh kiện	128-Pin LPC SuperI/O with System Hardware Monitoring

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12.0 Device Characteristics (Continued)

207

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12.5.3

LCLK and LRESET

Symbol

Parameter

Min

Max

Units

tCYC

1. The PCI may have any clock frequency between nominal DC and 33

MHz. Device operational parameters at frequencies under 16 MHz may

be guaranteed by design rather than by testing. The clock frequency

may be changed at any time during the operation of the system as long

as the clock edges remain “clean” (monotonic) and the minimum cycle

and high and low times are not violated. The clock may only be stopped

in a low state.

LCLK Cycle Time

tHIGH

LCLK High Time

tLOW

LCLK Low Time

LCLK Slew Rate2

2. Rise and fall times are speciﬁed in terms of the edge rate measured in

V/ns. This slew rate must be met across the minimum peak-to-peak por-

tion of the clock wavering as shown below.

V/ns

LRESET Slew Rate3

3. The minimum LRESET slew rate applies only to the rising (de-assertion)

edge of the reset signal and ensures that system noise cannot make an

otherwise monotonic signal appear to bounce in the switching range.

mV/ns

0.6 VDD

0.2 VDD

0.5 VDD

0.4 VDD

0.3 VDD

0.4 VDD p-to-p

(minimum)

tHIGH

tLOW

3.3V Clock

tCYC

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