CY24239
Document #: 38-07038 Rev. **
Page 10 of 15
AC Electrical Characteristics
TA = 0°C to +70°C, VDDQ3 = 3.3V±5%, fXTL = 14.31818 MHz
AC clock parameters are tested and guaranteed over stated operating conditions using the stated lump capacitive load at the
clock output; Spread Spectrum is disabled.
Notes:
5.
X1 input threshold voltage (typical) is VDDQ3/2.
6.
The CY24239 contains an internal crystal load capacitor between pin X1 and ground and another between pin X2 and ground. Total load placed on crystal is
20 pF; this includes typical stray capacitance of short PCB traces to crystal.
7.
X1 input capacitance is applicable when driving X1 with an external clock source (X2 is left unconnected).
Crystal Oscillator
VTH
X1 Input Threshold Voltage[5]
VDDQ3 = 3.3V
1.65
V
CLOAD
Load Capacitance, Imposed on
External Crystal[6]
14
pF
CIN,X1
X1 Input Capacitance[7]
Pin X2 unconnected
28
pF
Pin Capacitance/Inductance
CIN
Input Pin Capacitance
Except X1 and X2
5
pF
COUT
Output Pin Capacitance
6pF
LIN
Input Pin Inductance
7nH
CPU Clock Outputs, CPU_F, 1:2 (Lump Capacitance Test Load = 20 pF)
Parameter
Description
Test Condition/
Comments
CPU = 100 MHz
Unit
Min.
Typ.
Max.
tP
Period
Measured on rising edge at 1.25
10
10.5
ns
tH
High Time
Duration of clock cycle above 2.0V
3.0
ns
tL
Low Time
Duration of clock cycle below 0.4V
2.8
ns
tR
Output Rise
Edge Rate
Measured from 0.4V to 2.0V
1
4
V/ns
tF
Output Fall Edge
Rate
Measured from 2.0V to 0.4V
1
4
V/ns
tD
Duty Cycle
Measured on rising and falling edge at
1.25V
45
55
%
tJC
Jitter,
Cycle-to-Cycle
Measured on rising edge at 1.25V. Maxi-
mum difference of cycle time between two
adjacent cycles.
250
ps
tSK
Output Skew
Measured on rising edge at 1.25V
350
ps
fST
Frequency
Stabilization
from Power-up
(cold start)
Assumes full supply voltage reached with-
in 1 ms from power-up. Short cycles exist
prior to frequency stabilization.
3ms
Zo
AC Output
Impedance
Average value during switching transition.
Used for determining series termination
value.
20
Ω
DC Electrical Characteristics: TA = 0°C to +70°C, VDDQ3 = 3.3V±5% (continued)
Parameter
Description
Test Condition
Min.
Typ.
Max.
Unit
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