5–12
Chapter 5: DC and Switching Characteristics
Timing Model and Specifications
Table 5–16. IOE Internal Timing Microparameters (Part 2 of 2)
–3 Speed
Grade
–4 Speed
Grade
–5 Speed
Grade
–6 Speed
Grade
–7 Speed
Grade
Symbol
Parameter
Output buffer disable
delay
Min Max Min Max
Min Max Min Max Min Max Unit
tXZ (3)
—
756
—
982
—
1,209
—
1,045
—
1,264 ps
tZX (4)
Output buffer enable
delay
—
1,003
—
1,303
—
1,604
—
1,160
—
1,325 ps
Notes to Table 5–16:
(1) Delay numbers for tGLOB differ for each device density and speed grade. The delay numbers for tGLOB, shown in Table 5–16, are based on an
EPM240 device target.
(2) Refer to Table 5–29 and 5–21 for delay adders associated with different I/O standards, drive strengths, and slew rates.
(3) Refer to Table 5–19 and 5–13 for tXZ delay adders associated with different I/O standards, drive strengths, and slew rates.
(4) Refer to Table 5–17 and 5–12 for tZX delay adders associated with different I/O standards, drive strengths, and slew rates.
Table 5–17 through Table 5–20 show the adder delays for tZX and tXZ microparameters
when using an I/O standard other than 3.3-V LVTTL with 16 mA drive strength.
Table 5–17. tZX IOE Microparameter Adders for Fast Slew Rate
–3 Speed
Grade
–4 Speed
Grade
–6 Speed
Grade
–7 Speed
Grade
–5 Speed Grade
Standard
3.3-V LVCMOS
Min
Max
Min
Max
Min
—
—
—
—
—
—
—
—
—
—
—
Max
0
Min
Max
Min
Max
Unit
ps
ps
ps
ps
ps
ps
ps
ps
ps
ps
ps
8 mA
4 mA
16 mA
8 mA
14 mA
7 mA
6 mA
3 mA
4 mA
2 mA
20 mA
—
—
—
—
—
—
—
—
—
—
—
0
28
—
—
—
—
—
—
—
—
—
—
—
0
37
—
0
—
—
—
—
—
—
—
—
—
—
—
0
45
—
—
—
—
—
—
—
—
—
—
72
0
71
3.3-V LVTTL
2.5-V LVTTL
1.8-V LVTTL
1.5-V LVTTL
3.3-V PCI
0
0
0
0
28
37
45
72
71
14
19
23
75
87
314
450
1,443
1,118
2,410
19
409
585
1,876
1,454
3,133
25
503
720
2,309
1,789
3,856
31
162
279
499
580
915
72
174
289
508
588
923
71
Table 5–18. tZX IOE Microparameter Adders for Slow Slew Rate
–3 Speed
Grade
–5 Speed
Grade
–6 Speed
Grade
–7 Speed
Grade
–4 Speed Grade
Standard
3.3-V LVCMOS
Min
Max
Min
—
Max
Min
Max
Min
Max Min
Max Unit
8 mA
4 mA
16 mA
8 mA
—
—
—
—
6,350
9,383
6,350
9,383
6,050
9,083
6,050
9,083
—
5,749
8,782
5,749
8,782
—
—
—
—
5,951
6,534
5,951
6,534
—
—
—
—
5,952
6,533
5,952
6,533
ps
ps
ps
ps
—
—
—
—
3.3-V LVTTL
—
—
MAX II Device Handbook
© Novermber 2008 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
