.......................Document #: 38-07010 Rev. *C Page 8 of 16
-
Switching Characteristics
[9]
Over the Operating Range
Parameter Output Description Test Conditions Min. Max. Unit
t
1
All Output Duty Cycle
[10]
Measured at 1.5V 45 55 %
t
3
USB, REF, DOT Falling Edge Rate Between 2.4V and 0.4V 0.5 2.0 ns
t
3
PCI,3V66 Falling Edge Rate Between 2.4V and 0.4V 1.0 4.0 V/ns
t
5
3V66[0:1] 3V66-3V66 Skew Measured at 1.5V 500 ps
t
5
66BUFF[0:2] 66BUFF-66BUFF Skew Measured at 1.5V 175 ps
t
6
PCI PCI-PCI Skew Measured at 1.5V 500 ps
t
7
3V66, PCI 3V66-PCI Clock Jitter 3V66 leads. Measured at 1.5V 1.5 3.5 ns
t
9
3V66 Cycle-Cycle Clock Jitter Measured at 1.5V t
9
= t
9A
– t
9B
250 ps
t
9
USB, DOT Cycle-Cycle Clock Jitter Measured at 1.5V t
9
= t
9A
– t
9B
350 ps
t
9
PCI Cycle-Cycle Clock Jitter Measured at 1.5V t
9
= t
9A
– t
9B
500 ps
t
9
REF Cycle-Cycle Clock Jitter Measured at 1.5V t
9
= t
9A
– t
9B
1000 ps
CPU 1.0V Switching Characteristics
t
2
CPU Rise Time Measured differential waveform from
–0.35V to +0.35V
175 467 ps
t
3
CPU Fall Time Measured differential waveform from
–0.35V to +0.35V
175 467 ps
t
4
CPU CPU-CPU Skew Measured at Crossover 150 ps
t
8
CPU Cycle-Cycle Clock Jitter Measured at Crossover t
8
= t
8A
– t
8B
150 ps
CPU Rise/Fall Matching Measured with test loads
[11]
325 mV
V
oh
CPU High-level Output Voltage
including overshoot
Measured with test loads
[11]
0.92 1.45 V
V
ol
CPU Low-level Output Voltage
including undershoot
Measured with test loads
[11]
–0.2 0.35 V
V
crossover
CPU Crossover Voltage Measured with test loads
[11]
0.51 0.76 V
CPU 0.7V Switching Characteristics
t
2
CPU Rise Time Measured single ended waveform from
0.175V to 0.525V
175 700 ps
t
3
CPU Fall Time Measured single ended waveform from
0.175V to 0.525V
175 700 ps
t
4
CPU CPU-CPU Skew Measured at Crossover 150 ps
t
8
CPU Cycle-Cycle Clock Jitter Measured at Crossover t
8
= t
8A
– t
8B
With all outputs running
150 ps
CPU Rise/Fall Matching Measured with test loads
[12, 13]
20 %
V
oh
CPU High-level Output Voltage
Including Overshoot
Measured with test loads
[13]
0.85 V
V
ol
CPU Low-level Output Voltage
Including Undershoot
Measured with test loads
[13]
–0.15 V
V
crossover
CPU Crossover Voltage Measured with test loads
[13]
0.28 0.43 V
Notes:
9. All parameters specified with loaded outputs.
10.Duty cycle is measured at 1.5V when V
DD
= 3.3V. When V
DD
= 2.5V, duty cycle is measured at 1.25V.
11. The 1.0V test load is shown on the test circuit page.
12.Determined as a fraction of 2*(Trp – Trn)/(Trp +Trn) Where Trp is a rising edge and Trp is an intersecting falling edge.
13.The 0.7V test load is R
s
= 33.2 ohm, R
p
= 49.9 ohm in test circuit.
