MEC1322 Datasheet, PDF (399/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
TABLE 38-4: CLOCK TIMING PARAMETERS
Clock
Parameters
Symbol
MIN
TYP
MAX
Units
48 MHz Ring
Oscillator
SUSCLK
Note 38-4
Start-up accuracy (without 32 kHz
f_SU
22
-
present)
Start-up delay from 0 MHz to Start-
t_SU
-
-
up accuracy
Operating Frequency (with 32 kHz
f_OP
present after frequency lock to 48
MHz)
47.04
48
Adjustment Delay from Start-up
t_ADJ
0.03
-
accuracy to Operating accuracy
(time to attain frequency lock - with
32 kHz present)
Operating Frequency (with 32 kHz
removed after frequency locked to
48 MHz)
f_OP
43.2
-
(Note 38-6)
Operating Frequency
-
-
32.768
Period
-
(Note 38-5) 30.52
High Time
-
10
Low Time
-
10
Fall Time
-
-
-
Rise Time
-
-
-
This time only applies if the external 32KHz clock input is available.
53
6
48.95
4
(Note 38-4)
52.8
(Note 38-6)
-
(Note 38-5)
1
1
MHz
µs
MHz
ms
MHz
kHz
µs
us
us
us
us
Note 38-5 SUSCLK is required to have an accuracy of +/- 100 ppm.
Note 38-6 The drift in frequency after frequency lock if the 32kHz clock is removed is determined by varying
temperature while voltage is held constant.
 2014 - 2015 Microchip Technology Inc.
DS00001719D-page 399