CY28349 Datasheet, PDF (16/20 Pages) SpectraLinear Inc – FTG for Intel® Pentium® 4 CPU and Chipsets

CY28349
- _{Switching Characteristics[3] Over the Operating Range}
Parameter
t₁
t₂
t₂
t₂
t₃
t₃
t₃
t₄
t₅
t₆
t₇
t₈
Output
All
CPU
48MHz, REF
PCI, 3V66,
CPU
48MHz, REF
PCI, 3V66
CPU
3V66 [0:1]
PCI
3V66,PCI
CPU
Description
Output Duty Cycle^[4]
Rise Time
Rising Edge Rate
Rising Edge Rate
Fall Time
Falling Edge Rate
Falling Edge Rate
CPU-CPU Skew
3V66-3V66 Skew
PCI-PCI Skew
3V66-PCI Clock Skew
Cycle-Cycle Clock Jitter
t₉
3V66
Cycle-Cycle Clock Jitter
t₉
48MHz
Cycle-Cycle Clock Jitter
t₉
PCI
Cycle-Cycle Clock Jitter
t₉
REF
Cycle-Cycle Clock Jitter
CPU, PCI
Settle Time
CPU
CPU
Rise/Fall Matching
Overshoot
Test Conditions
t_1A/(t_1B)
Measured at 20% to 80% of V_oh
Between 0.4V and 2.4V
Between 0.4V and 2.4V
Measured at 80% to 20% of V_oh
Between 2.4V and 0.4V
Between 2.4V and 0.4V
Measured at Crossover
Measured at 1.5V
Measured at 1.5V
3V66 leads. Measured at 1.5V
Measured at Crossover t_{8 =} t_8A – t_8B
With all outputs running
Measured at 1.5V t_{9 =} t_9A – t_9B
Measured at 1.5V t_{9 =} t_9A – t_9B
Measured at 1.5V t_{9 =} t_9A – t_9B
Measured at 1.5V t_{9 =} t_9A – t_9B
CPU and PCI clock stabilization from
power-up
Measured with test loads^{[5, 6]}
Measured with test loads^[6]
V_oh
V_ol
V_crossover
CPU
CPU
CPU
CPU
Undershoot
High-level Output Voltage
Low-level Output Voltage
Crossover Voltage
Measured with test loads^[6]
Measured with test loads^[6]
Measured with test loads^[6]
Measured with test loads^[6]
Notes:
3. All parameters specified with loaded outputs.
4. Duty cycle is measured at 1.5V when V_DD = 3.3V. When V_DD = 2.5V, duty cycle is measured at 1.25V.
5. Determined as a fraction of 2*(Trp – Trn)/(Trp +Trn) Where Trp is a rising edge and Trn is an intersecting falling edge.
6. The test load is R_s = 33.2:, R_p = 49.9: in test circuit.
Min.
45
175
0.5
1.0
175
0.5
1.0
1.5
–0.2
0.65
0.0
45%
of
0.65
Max.
55
700
2.0
4.0
700
2.0
4.0
150
500
500
3.5
200
Unit
%
ps
V/ns
V/ns
ps
V/ns
V/ns
ps
ps
ps
ns
ps
250 ps
350 ps
500 ps
1000 ps
3
ms
20%
V_oh + V
0.2
V
0.74 V
0.05 V
55% of V
0.74
Rev 1.0, November 24, 2006
Page 16 of 20