5–22
Chapter 5: DC and Switching Characteristics
Timing Model and Specifications
Maximum Input and Output Clock Rates
and
show the maximum input and output clock rates for
standard I/O pins in MAX II devices.
Table 5–29.
MAX II Maximum Input Clock Rate for I/O
Standard
3.3-V LVTTL
Without Schmitt
Trigger
With Schmitt
Trigger
3.3-V LVCMOS
Without Schmitt
Trigger
With Schmitt
Trigger
2.5-V LVTTL
Without Schmitt
Trigger
With Schmitt
Trigger
2.5-V LVCMOS
Without Schmitt
Trigger
With Schmitt
Trigger
1.8-V LVTTL
1.8-V LVCMOS
1.5-V LVCMOS
3.3-V PCI
Without Schmitt
Trigger
Without Schmitt
Trigger
Without Schmitt
Trigger
Without Schmitt
Trigger
–3 Speed
Grade
304
250
304
250
220
188
220
188
200
200
150
304
–4 Speed
Grade
304
250
304
250
220
188
220
188
200
200
150
304
–5 Speed
Grade
304
250
304
250
220
188
220
188
200
200
150
304
–6 Speed
Grade
304
250
304
250
220
188
220
188
200
200
150
304
–7 Speed
Grade
304
250
304
250
220
188
220
188
200
200
150
304
Unit
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
Table 5–30.
MAX II Maximum Output Clock Rate for I/O
Standard
3.3-V LVTTL
3.3-V LVCMOS
2.5-V LVTTL
2.5-V LVCMOS
1.8-V LVTTL
1.8-V LVCMOS
1.5-V LVCMOS
3.3-V PCI
–3 Speed
Grade
304
304
220
220
200
200
150
304
–4 Speed
Grade
304
304
220
220
200
200
150
304
–5 Speed
Grade
304
304
220
220
200
200
150
304
–6 Speed
Grade
304
304
220
220
200
200
150
304
–7 Speed
Grade
304
304
220
220
200
200
150
304
Unit
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
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