CY28329 Datasheet, PDF (8/17 Pages) Cypress Semiconductor – 133-MHz Spread Spectrum Clock Synthesizer/Driver with Differential CPU Outputs

CY28329
Switching Characteristics Over the Operating Range^[8]
Parameter
t₁
t₂
Output
All
CPU
Description
Output Duty Cycle^[9]
Rise Time
Test Conditions
Measured at 1.5V
Measured differential waveform from
–0.35V to +0.35V
t₂
USB, REF,
Rising Edge Rate
Between 0.4V and 2.4V
DOT
t₂
PCI, 3V66
Rising Edge Rate
Between 0.4V and 2.4V
t₃
CPU
Fall Time
Measured differential waveform from
–0.35V to +0.35V
t₃
USB, REF,
Falling Edge Rate
Between 2.4V and 0.4V
DOT
t₃
PCI, 3V66
Falling Edge Rate
Between 2.4V and 0.4V
t₄
CPU
CPU-CPU Skew
Measured at Crossover
t₅
3V66 [0:1]
3V66-3V66 Skew
Measured at 1.5V
t₅
66BUFF[0:2] 66BUFF-66BUFF Skew Measured at 1.5V
t₆
PCI
PCI-PCI Skew
Measured at 1.5V
t₇
3V66, PCI
3V66-PCI Clock Skew
3V66 leads. Measured at 1.5V
t₈
CPU
Cycle-Cycle Clock Jitter Measured at Crossover t_{8 =} t_8A – t_8B
With all outputs running
t₉
3V66
Cycle-Cycle Clock Jitter
Measured at 1.5V t_{9 =} t_9A – t_9B
t₉
USB, DOT
Cycle-Cycle Clock Jitter
Measured at 1.5V t_{9 =} t_9A – t_9B
t₉
PCI
Cycle-Cycle Clock Jitter
Measured at 1.5V t_{9 =} t_9A – t_9B
t₉
REF
Cycle-Cycle Clock Jitter
Measured at 1.5V t_{9 =} t_9A – t_9B
t₁₀
ALL
POR timing
Measured at 1.5V^{[10, 11]}
CPU
Rise/Fall Matching
Measured with test loads^{[12, 13]}
V_oh
CPU
High-level Output Voltage Measured with test loads^[13]
including overshoot
V_ol
CPU
Low-level Output Voltage Measured with test loads^[13]
including undershoot
V_crossover
CPU
Crossover Voltage
Measured with test loads^[13]
Notes:
8. All parameters specified with loaded outputs.
9. Duty cycle is measured at 1.5V when V_DD = 3.3V. When V_DD = 2.5V, duty cycle is measured at 1.25V.
10. POR starts when V_DD reaches 1.5V.
11. All PULL-UPs must ramp at the same rate as V_DD.
12. Determined as a fraction of 2*(Trp – Trn)/(Trp +Trn) Where Trp is a rising edge and Trn is an intersecting falling edge.
13. The test load is R_s = 33.2Ω, R_p = 49.9Ω in test circuit.
Min.
45
175
0.5
1.0
175
0.5
1.0
1.5
1.0
0.92
–0.2
0.250
Max.
55
700
2.0
4.0
700
2.0
4.0
150
500
175
500
3.5
150
250
350
500
1000
4.0
235
1.45
0.35
0.550
Unit
%
ns
ns
V/ns
ps
ns
V/ns
ps
ps
ps
ps
ns
ps
ps
ps
ps
ps
ms
mV
V
V
V
Document #: 38-07040 Rev. *E
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