atf1504se ATMEL Corporation, atf1504se Datasheet - Page 9

• Manufacturer Part Number: atf1504se
• Description: Family Datasheet
• Manufacturer: ATMEL Corporation

Power
Consumption
Estimates
Standby Power
Active Power
2401D–PLD–09/02
latches remain active to ensure that pins do not float to indeterminate levels, further reducing
system power. All pin transitions are ignored until the PD pin is brought low. When the power-
down feature is enabled for PD1 or PD2, that pin cannot be used as a logic input or output.
However, the pin’s macrocell may still be used to generate buried foldback and cascade logic
signals. The power-down option is selected in the design source file.
An estimate of power consumption can be made based on typical designs and operation con-
ditions, but because it is sensitive to these factors, power consumption must be verified with
actual pattern and operation conditions. The equations given below are based on a pattern of
16-bit up/down counters in each logic block and may be used to estimate power consumption
for both operating modes.
1. P
Where:
I
trolled Power Down)
V
2. P
Where:
I
V
P
put pin.
P
(“L” versions) can be estimated according to the methods discussed in the Atmel Application
Note “Saving Power with Atmel PLDs”
3. I
Where:
MC
MC
ered down.)
NS = the proportion of logic nodes switching (typically 10-20%)
f
K
Note:
ccstandby
ccinternal
op
Device
ATF1502SE
ATF1504SE
ATF1508SE
ATF1516SE
supply
supply
load
load
1
, K
= the switching frequency
reducedpower
inuse
NS)
ccinternal
2,
= depends on the device output load capacitance and switching frequency on each out-
and additional power savings at low frequencies using Atmel Input Transition Detection
standby
active
= the power supply voltage
= the power supply voltage
and K
= the number of macrocells in use (from fitter report file. Unused macrocells are pow-
= the internal current estimated from equation 3 below
= the standby current given for the particular device and standby mode (e.g. pin con-
Shaded data is preliminary and subject to change without notice.
= P
= I
= [K
3
internal
= device constants given in the table below.
= the number of macrocells operating at reduced power (from fitter report file)
ccstandby
1
x (MC
+ P
x V
load
inuse –
supply
= I
ccinternal
MC
reducedpower
x V
K
1
supply
(mA/MC)
0.6
0.6
0.6
0.6
)] + (K
+ P
load
2
x MC
reducedpower
ATF15xxSE Family
K
2
(mA/MC)
0.3
0.3
0.3
0.3
) + (K
3
x MC
K
3
(mA/MC · MHz)
inuse
0.015
0.015
0.015
0.015
x f
op
x
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