Cirrus Logic CS470xx - Manual (Page 14)

DS787PP9 14
5.7 Digital Switching Characteristics–XTI
Figure 5-1. RESET Timing at Power-on
Figure 5-2. RESET Timing after Power is Stable
5.7 Digital Switching Characteristics–XTI
1. Part characterized with the following crystal frequency values: 12.288 and 24.576 MHz.
2. C
L
refers to the total load capacitance as specified by the crystal manufacturer. Crystals that require a C
L
outside this range should be avoided. The
crystal oscillator circuit design should follow the crystal manufacturer’s recommendation for load capacitor selection.
Figure 5-3. XTI Timing
Parameter Symbol Min Max Unit
External Crystal operating frequency 1 F
xtal
12.288 24.576 MHz
XTI period T
clki
41 81 ns
XTI high time T
clkih
13.3 — ns
XTI low time T
clkil
13.3 — ns
External Crystal Load Capacitance (parallel resonant) 2 C
L
10 18 pF
External Crystal Equivalent Series Resistance ESR — 50 
T
rstl
T
rstsu
T
rsthld
HS[3:0]
All supplies at
recommended
operating values.
VDD 1
1 Refers to all power supplies.
RESET
RESET
T
rst2z
T
rstl
T
rstsu
T
rsthld
HS[3:0]
All Bidirectional
Pins
t
clkih
t
clkil
T
clki
XTI