EPM240 Datasheet, PDF (70/86 Pages) Altera Corporation – JTAG & In-System Programmability

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
Min Max Min Max Min Max Min Max Min Max Unit
t_XZ (3)
Output buffer disable
delay
— 756 — 982 — 1,209 — 1,045 — 1,264 ps
t_ZX (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 t_GLOB differ for each device density and speed grade. The delay numbers for t_GLOB, 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 t_XZ delay adders associated with different I/O standards, drive strengths, and slew rates.
(4) Refer to Table 5–17 and 5–12 for t_ZX 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 t_ZX and t_XZ microparameters
when using an I/O standard other than 3.3-V LVTTL with 16 mA drive strength.
Table 5–17. t_ZX IOE Microparameter Adders for Fast Slew Rate
–3 Speed
Grade
–4 Speed
Grade
–6 Speed
–5 Speed Grade Grade
–7 Speed
Grade
Standard
Min Max Min Max Min Max Min Max Min Max Unit
3.3-V LVCMOS 8 mA —
0
—0
—
0
—0
—
0
ps
4 mA — 28
— 37
—
45
— 72 — 71 ps
3.3-V LVTTL
16 mA —
0
—0
—
0
—0
—
0
ps
8 mA — 28
— 37
—
45
— 72 — 71 ps
2.5-V LVTTL
14 mA — 14
— 19
—
23
— 75 — 87 ps
7 mA — 314 — 409 — 503 — 162 — 174 ps
1.8-V LVTTL
6 mA — 450 — 585 — 720 — 279 — 289 ps
3 mA — 1,443 — 1,876 — 2,309 — 499 — 508 ps
1.5-V LVTTL
4 mA — 1,118 — 1,454 — 1,789 — 580 — 588 ps
2 mA — 2,410 — 3,133 — 3,856 — 915 — 923 ps
3.3-V PCI
20 mA — 19
— 25
—
31
— 72 — 71 ps
Table 5–18. t_ZX IOE Microparameter Adders for Slow Slew Rate
–3 Speed
Grade
–4 Speed Grade
–5 Speed
Grade
Standard
3.3-V LVCMOS 8 mA
4 mA
3.3-V LVTTL
16 mA
8 mA
Min Max Min Max Min Max
— 6,350 — 6,050 — 5,749
— 9,383 — 9,083 — 8,782
— 6,350 — 6,050 — 5,749
— 9,383 — 9,083 — 8,782
–6 Speed
Grade
–7 Speed
Grade
Min Max Min Max Unit
— 5,951 — 5,952 ps
— 6,534 — 6,533 ps
— 5,951 — 5,952 ps
— 6,534 — 6,533 ps
MAX II Device Handbook
© Novermber 2008 Altera Corporation