OR4 datasheet(79/152 Pages) LATTICE

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Lattice Semiconductor

Data Sheet

May, 2006

ORCA Series 4 FPGAs

Timing Characteristics (continued)

Table 37. I/O Derating for 3.3 V I/Os (VDDIO)—Only valid for TTL/CMOS I/Os

Table 38. Internal Derating for 1.5V (VDD15)

In addition to supply voltage, process variation, and operating temperature, circuit and process improvements of

the ORCA Series FPGAs over time will result in significant improvement of the actual performance over those listed

for a speed grade. Even though lower speed grades may still be available, the distribution of yield to timing param-

eters may be several speed grades higher than that designated on a product brand. Design practices need to con-

sider best-case timing parameters (e.g., delays = 0), as well as worst-case timing.

The routing delays are a function of fan-out and the capacitance associated with the CIPs and metal interconnect in

the path. The number of logic elements that can be driven (fan-out) by PFUs is unlimited, although the delay to

reach a valid logic level can exceed timing requirements. It is difficult to make accurate routing delay estimates prior

to design compilation based on fan-out. This is because the CAE software may delete redundant logic inserted by

the designer to reduce fan-out, and/or it may also automatically reduce fan-out by net splitting.

The waveform test points are given in the Input/Output Buffer Measurement Conditions section of this data sheet.

The timing parameters given in the electrical characteristics tables in this data sheet follow industry practices, and

the values they reflect are described below.

TJ (°C)

Commercial

TJ (°C)

Industrial

Power Supply Voltage

3.0 V

3.15 V

3.3 V

3.45 V

3.6 V

–

–40

0.82

0.80

0.77

0.75

0.74

–40

–25

0.83

0.81

0.78

0.76

0.75

015

0.87

0.84

0.81

0.80

0.78

0.91

0.88

0.85

0.82

0.81

100

1.00

0.97

0.93

0.91

0.88

100

115

1.02

0.99

0.96

0.93

0.90

110

125

1.05

1.01

0.97

0.95

0.92

125

–

1.07

1.03

0.99

0.97

0.94

TJ (°C)

Commercial

TJ (°C)

Industrial

Power Supply Voltage

1.40 V

1.425 V

1.500 V

1.575 V

1.6 V

–

–40

0.87

0.85

0.82

0.79

0.78

–40

–25

0.89

0.87

0.83

0.80

0.79

015

0.93

0.91

0.87

0.82

0.81

0.96

0.94

0.89

0.85

0.84

100

1.02

1.00

0.95

0.91

0.90

100

115

1.04

1.02

0.97

0.93

0.92

110

125

1.05

1.03

0.98

0.94

0.93

125

–

1.06

1.05

1.00

0.96

0.95

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