Chapter 5: DC and Switching Characteristics
5–21
Timing Model and Specifications
External Timing I/O Delay Adders
The I/O delay timing parameters for I/O standard input and output adders, and
input delays are specified by speed grade independent of device density.
Table 5–27 through Table 5–28 show the adder delays associated with I/O pins for all
packages. The delay numbers for –3, –4, and –5 speed grades shown in Table 5–27
through Table 5–30 are based on an EPM1270 device target, while –6 and –7 speed
grade values are based on an EPM570Z device target. If an I/O standard other than
3.3-V LVTTL is selected, add the input delay adder to the external tSU timing
parameters shown in Table 5–23 through Table 5–26. If an I/O standard other than
3.3-V LVTTL with 16 mA drive strength and fast slew rate is selected, add the output
delay adder to the external tCO and tPD shown in Table 5–23 through Table 5–26.
Table 5–27. External Timing Input Delay Adders
–3 Speed
Grade
–4 Speed
Grade
–5 Speed
Grade
–6 Speed
Grade
–7 Speed
Grade
Standard
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max Unit
3.3-V LVTTL Without Schmitt
Trigger
—
0
—
0
—
0
—
0
—
0
ps
With
—
334
—
434
—
535
—
387
—
434
ps
Schmitt Trigger
3.3-V
LVCMOS
Without Schmitt
Trigger
—
—
0
—
—
0
—
—
0
—
—
0
—
—
0
ps
ps
With
334
434
535
387
434
Schmitt Trigger
2.5-V LVTTL
Without Schmitt
Trigger
—
—
—
—
—
23
339
291
681
0
—
—
—
—
—
30
441
378
885
0
—
—
—
—
—
37
543
466
1,090
0
—
—
—
—
—
42
429
378
681
0
—
—
—
—
—
43
476
373
622
0
ps
ps
ps
ps
ps
With Schmitt
Trigger
1.8-V LVTTL
1.5-V LVTTL
3.3-V PCI
Without Schmitt
Trigger
Without Schmitt
Trigger
Without Schmitt
Trigger
Table 5–28. MAX II IOE Programmable Delays
–3 Speed
Grade
–4 Speed
Grade
–5 Speed
Grade
–6 Speed
Grade
–7 Speed
Grade
Parameter
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Unit
Input Delay from Pin to Internal
Cells = 1
—
1,225
—
1,592
—
1,960
—
1,858
—
2,171
ps
Input Delay from Pin to Internal
Cells = 0
—
89
—
115
—
142
—
569
—
609
ps
© Novermber 2008 Altera Corporation
MAX II Device Handbook
ALTERA [ ALTERA CORPORATION ]
