5–20
Chapter 5: DC and Switching Characteristics
Timing Model and Specifications
Table 5–25. EPM1270 Global Clock External I/O Timing Parameters (Part 2 of 2)
–3 Speed Grade
–4 Speed Grade –5 Speed Grade
Symbol
tCNT
Parameter
Condition
Min
Max
Min
Max
Min
Max
Unit
Minimum global clock
period for
—
3.3
—
4.0
—
5.0
—
ns
16-bit counter
fCNT
Maximum global clock
frequency for 16-bit
counter
—
—
304.0 (1)
—
247.5
—
201.1
MHz
Note to Table 5–25:
(1) The maximum frequency is limited by the I/O standard on the clock input pin. The 16-bit counter critical delay performs faster than this global
clock input pin maximum frequency.
Table 5–26 shows the external I/O timing parameters for EPM2210 devices.
Table 5–26. EPM2210 Global Clock External I/O Timing Parameters
–3 Speed Grade –4 Speed Grade –5 Speed Grade
Symbol
tPD1
Parameter
Condition
Min
Max
Min
Max
Min
Max
Unit
Worst case pin-to-pin delay
through 1 look-up table
(LUT)
10 pF
—
7.0
—
9.1
—
11.2
ns
tPD2
Best case pin-to-pin delay
through 1 LUT
10 pF
—
3.7
—
4.8
—
5.9
ns
tSU
tH
Global clock setup time
Global clock hold time
Global clock to output delay
Global clock high time
Global clock low time
—
—
1.2
0.0
2.0
166
166
3.3
—
—
4.6
—
—
—
1.5
0.0
2.0
216
216
4.0
—
—
6.0
—
—
—
1.9
0.0
2.0
266
266
5.0
—
—
7.4
—
—
—
ns
ns
ns
ps
ps
ns
tCO
tCH
tCL
tCNT
10 pF
—
—
Minimum global clock
period for
—
16-bit counter
fCNT
Maximum global clock
frequency for 16-bit counter
—
—
304.0
(1)
—
247.5
—
201.1
MHz
Note to Table 5–26:
(1) The maximum frequency is limited by the I/O standard on the clock input pin. The 16-bit counter critical delay performs faster than this global
clock input pin maximum frequency.
MAX II Device Handbook
© Novermber 2008 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
