S1K50000 Epson Electronics America, Inc., S1K50000 Datasheet - Page 91

• Manufacturer Part Number: S1K50000
• Description: Design Guide S1k50000 Series
• Manufacturer: Epson Electronics America, Inc.

Chapter 7: Estimating Power Consumption
86
(3) Power consumption in the internal cells (P
To provide low-power operation, Seiko Epson offers a low-power-consumption-type cell known
as a “Low-Power Cell.” Use of this low-power cell helps to reduce the power consumption per
gate to almost half that of ordinary cells (Normal Cell), although the propagation delay time
increases slightly.
When using low-power cells, halve the S1K50000-series K
in the calculation of the power consumption.
The low-power cells are flip-flop cells with names suffixed by “X0,” and cells with names
suffixed by “C.”
The power consumption in the internal cells varies depending on the cell type, usage
efficiency of the cell, operating frequency, and the percentage of cells that operate at that
operating frequency, and is calculated as follows:
P
int
=
i=1
where N
K
{N
Table 7-2 K
f
S
K
f
i
p
pint
i
i
V
S
: total number of BC
: operating frequency of the i’th cell (MHz)
: percentage of cells among all that operate at the operating
: See Table 7-2
DD
3.3 V
2.0 V
p
frequency, f
i
(Typ.)
(K
pint
pint
per BC in the S1K50000 Series
)} (W)
EPSON
i
(approximately 20%–30% is recommended)
int
)
0.22 µW/MHz
0.08 µW/MHz
K
pint
pint
value per BC listed in Table 7-2
STANDARD CELL S1K50000 SERIES
DESIGN GUIDE