CY24272
Document Number: 001-42414 Rev. **
Page 9 of 13
AC Electrical Specification
The AC Electrical specifications follow. [6]
Parameter
Description
Min
Typ
Max
Unit
tCYCLE
Clock Cycle time[19]
1.25
3.34
ns
tJIT(cc)
Jitter over 1-6 clock cycles at 400–635 MHz[20]
–25
40
ps
Jitter over 1-6 clock cycles at 638–667 MHz
–
25
30
ps
L20
Phase noise SSB spectral purity L(f) at 20 MHz offset: 400–500 MHz
(In addition, device must not exceed L(f) = 10log[1+(50x106/f)2.4] –138 for
f = 1 MHz to 100 MHz except for the region near f = REFCLK/Q where Q is
the value of the internal reference divider.)
–
–135
–128
dBC/Hz
tJIT(hper,cc)
Cycle-to-cycle duty cycle error at 400–635 MHz
–
25
40
ps
Cycle-to-cycle duty cycle error at 636–667 MHz
–
25
30
ps
Δt
SKEW
Drift in tSKEW when ambient temperature varies between 0°C and 70°C and
supply voltage varies between 2.375V and 2.625V.[21]
––
15
ps
DC
Long term average output duty cycle
45%
50
55%
tCYCLE
tEER,SCC
PLL output phase error when tracking SSC
–100
–
100
ps
tCR,tCF
Output rise and fall times at 400–667 MHz (measured at 20%–80% of output
voltage)
–150
–
ps
tCR,CF
Difference between output rise and fall times on the same pin of the single
device (20%–80%) of 400–667 MHz[22]
–
–
100
ps
Table 9. SMBus Timing Specification
Parameter
Description
Min
Max
Units
FSMB
SMBus Operating Frequency
10
100
kHz
TBUF
Bus free time between Stop and Start Condition
4.7
μs
THD:STA
Hold time after (Repeated) Start Condition.
After this period, the first clock is generated.
4.0
μs
TSU:STA
Repeated Start Condition setup time
4.7
μs
TSU:STO
Stop Condition setup time
4.0
μs
THD:DAT
Data Hold time
0
ns
TSU:DAT
Data Setup time
250
ns
TTIMEOUT
Detect clock low timeout
Not supported
TLOW
Clock low period
4.7
μs
THIGH
Clock high period
4.0
50
μs
TLOW:SEXT
Cumulative clock low extend time (slave device)
25
ms
CY24272 doesn’t
extend
TLOW:MEXT
Cumulative clock low extend time (master device)
10
ms
TF
Clock/Data Fall Time
300
ns
TR
Clock/Data Rise Time
1000
ns
TPOR
Time in which a device must be operational after power on reset
500
ms
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