OR3C80 datasheet(103/210 Pages) AGERE

103 / 210 page

Lucent Technologies Inc.

103

Data Sheet

June 1999

ORCA Series 3C and 3T FPGAs

Timing Characteristics

Description

To define speed grades, the

ORCA Series part number

designation (see Ordering Information) uses a single-

digit number to designate a speed grade. This number

is not related to any single ac parameter. Higher num-

bers indicate a faster set of timing parameters. The

actual speed sorting is based on testing the delay in a

path consisting of an input buffer, combinatorial delay

through all PLCs in a row, and an output buffer. Other

tests are then done to verify other delay parameters,

such as routing delays, setup times to FFs, etc.

The most accurate timing characteristics are reported

by the timing analyzer in the

ORCA Foundry Develop-

ment System. A timing report provided by the develop-

ment system after layout divides path delays into logic

and routing delays. The timing analyzer can also pro-

vide logic delays prior to layout. While this allows rout-

ing budget estimates, there is wide variance in routing

delays associated with different layouts.

The logic timing parameters noted in the Electrical

Characteristics section of this data sheet are the same

as those in the design tools. In the PFU timing given in

Table 41—Table 48, symbol names are generally a

concatenation of the PFU operating mode (as defined

in Table 3) and the parameter type. The setup, hold,

and propagation delay parameters, defined below, are

designated in the symbol name by the SET, HLD, and

DEL characters, respectively.

The values given for the parameters are the same as

those used during production testing and speed bin-

ning of the devices. The junction temperature and sup-

ply voltage used to characterize the devices are listed

in the delay tables. Actual delays at nominal tempera-

ture and voltage for best-case processes can be much

better than the values given.

It should be noted that the junction temperature used in

the tables is generally 85 °C. The junction temperature

for the FPGA depends on the power dissipated by the

device, the package thermal characteristics (

ΘJA), and

the ambient temperature, as calculated in the following

equation and as discussed further in the Package

Thermal Characteristics section:

TJmax = TAmax + (P •

ΘJA) °C

Note: The user must determine this junction tempera-

ture to see if the delays from

ORCA Foundry

should be derated based on the following derat-

ing tables.

Table 38 and Table 39 provide approximate power sup-

ply and junction temperature derating for OR3Cxx com-

mercial and industrial devices. Table 40 provides the

same information for the OR3Txxx devices (both com-

mercial and industrial). The delay values in this data

sheet and reported by

ORCA Foundry are shown as

1.00 in the tables. The method for determining the

maximum junction temperature is defined in the Pack-

age Thermal Characteristics section. Taken cumula-

tively, the range of parameter values for best-case vs.

worst-case processing, supply voltage, and junction

temperature can approach 3 to 1.

Table 38. Derating for Commercial Devices

(OR3Cxx)

Table 39. Derating for Industrial Devices (OR3Cxx)

Table 40. Derating for Commercial/Industrial

Devices (OR3Txxx)

Note: The derating tables shown above are for a typical critical path

that contains 33% logic delay and 66% routing delay. Since the

routing delay derates at a higher rate than the logic delay, paths

with more than 66% routing delay will derate at a higher rate

than shown in the table. The approximate derating values vs.

temperature are 0.26% per °C for logic delay and 0.45% per °C

for routing delay. The approximate derating values vs. voltage

are 0.13% per mV for both logic and routing delays at 25 °C.

(°C)

Power Supply Voltage

4.75 V

5.0 V

5.25 V

0.81

0.79

0.77

0.85

0.83

0.81

1.00

0.97

0.95

100

1.05

1.02

1.00

125

1.12

1.09

1.07

(°C)

Power Supply Voltage

4.5 V

4.75 V

5.0 V

5.25 V

5.5 V

–40

0.71

0.70

0.68

0.66

0.65

0.80

0.78

0.76

0.74

0.73

0.84

0.82

0.80

0.78

0.77

1.00

0.97

0.94

0.93

0.91

100

1.05

1.01

0.99

0.97

0.95

125

1.12

1.09

1.06

1.04

1.02

(°C)

Power Supply Voltage

3.0 V

3.3 V

3.6 V

–40

0.73

0.66

0.61

0.82

0.73

0.68

0.87

0.78

0.72

1.00

0.90

0.83

100

1.04

0.94

0.87

125

1.10

1.00

0.92

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