Specifications ispLSI 8600V
Power Consumption
operates product terms at their normal full power con-
sumption. For portions of the logic that can tolerate
longer propagation delays, selecting the slower “low-
power” setting will significantly reduce the power
dissipation for these product terms. Figure 10 shows the
relationship between power and operating speed.
Power consumption in the ispLSI 8600V device depends
on two primary factors: the speed at which the device is
operating and the number of product terms used. The
product terms have a fuse-selectable speed/power
tradeoff setting. Each group of four product terms has a
single speed/power tradeoff control fuse that acts on the
complete group of four. The fast “high-speed” setting
Figure 10. Typical Device Power Consumption vs fmax
600
500
400
ispLSI 8600V
300
200
100
0
Turbo
Non-Turbo
0
10 20 30 40 50 60 70 80 90 100 110 120 130
max (MHz)
f
Notes: Configuration of 30 20-bit counters
Typical current at 3.3V, 25¡ C
I
I
can be estimated for the ispLSI 8600V using the following equation:
CC
= 25.0 + (# of Turbo PTs * 0.25) + (# of Non-Turbo PTs 0.11) + (# of Macrocells Used * fmax * AF * 0.04)
*
CC
# of Turbo PTs = Number of Turbo Product Terms Used in Design
# of Non-Turbo PTs = Number of Non-Turbo Product Terms Used in Design
fmax = Maximum Operating Frequency
Average Macrocell Toggle Frequency
AF (Activity Factor) =
Fmax
Note: An Activity Factor of 1.0 means all macrocell registers toggle at fmax. An Activity Factor of 0.5 means the
average macrocell register toggles at half of fmax.
The I
estimate is based on typical conditions (V
= 3.3V, room temperature) and an assumption of two GLB loads
CC
CC
on average exists. These values are for estimates only. Since the value of I
is sensitive to operating conditions
CC
and the program in the device, the actual I
should be verified.
CC
0127/8600V
19