pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 365
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pc87591l-n05
Manufacturer Part Number
pc87591l-n05
Description
Lpc Mobile Embedded Controller
Manufacturer
National Semiconductor Corporation
Datasheet
1.PC87591L-N05.pdf
(401 pages)
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Revision 1.2
7.0 Device Specifications
7.6.15 LCLK and RESET1-2
V
Symbol
1. The PCI may have any clock frequency between nominal DC and 33 MHz. Device operational parameters at fre-
2. Rise and fall times are specified in terms of the edge rate measured in V/ns. This slew rate must be met across
3. The minimum RESET1-2 slew rate applies only to the rising (de-assertion) edge of the reset signal, and ensures
DD
t
t
t
CYC
HIGH
LOW
quencies 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.
the minimum peak-to-peak portion of the clock wavering as shown below.
that system noise cannot render an otherwise monotonic signal to appear to bounce in the switching range.
-
-
= 3.3V 10%
1
0.3 V
0.4 V
DD
0.5 V
LCLK Cycle Time
LCLK High Time
LCLK Low Time
LCLK Slew Rate
RESET1-2 Slew Rate
DD
DD
2
(Continued)
0.6 V
t
HIGH
3
DD
Parameter
Figure 157. LCLK Waveform
t
CYC
365
0.2 V
t
LOW
DD
Min
30
11
11
50
1
0.4 V
(minimum)
Max
4
DD
P-to-P
www.national.com
mV/ns
Units
V/ns
ns
ns
ns
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