ATF1504SE-5 Просмотр технического описания (PDF) - Atmel Corporation

Номер в каталоге

Компоненты Описание

производитель

ATF1504SE-5

ATF15xxSE Family Datasheet

Atmel Corporation 

Power

Consumption

Estimates

Standby Power

Active Power

2401D–PLD–09/02

ATF15xxSE Family

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. Pstandby = Iccstandby x Vsupply

Where:

Iccstandby = the standby current given for the particular device and standby mode (e.g. pin con-

trolled Power Down)

Vsupply= the power supply voltage

2. Pactive = Pinternal + Pload = Iccinternal x Vsupply + Pload

Where:

Iccinternal = the internal current estimated from equation 3 below

Vsupply= the power supply voltage

Pload = depends on the device output load capacitance and switching frequency on each out-

put pin.

Pload and additional power savings at low frequencies using Atmel Input Transition Detection

(“L” versions) can be estimated according to the methods discussed in the Atmel Application

Note “Saving Power with Atmel PLDs”

3. Iccinternal = [K1 x (MCinuse – MCreducedpower )] + (K2 x MCreducedpower) + (K3 x MCinuse x fop x

NS)

Where:

MCreducedpower = the number of macrocells operating at reduced power (from fitter report file)

MCinuse= the number of macrocells in use (from fitter report file. Unused macrocells are pow-

ered down.)

NS = the proportion of logic nodes switching (typically 10-20%)

fop = the switching frequency

K1, K2,and K3 = device constants given in the table below.

Device

ATF1502SE

K1 (mA/MC)

0.6

K2 (mA/MC)

0.3

ATF1504SE

0.6

0.3

ATF1508SE

0.6

0.3

ATF1516SE

0.6

0.3

Note: Shaded data is preliminary and subject to change without notice.

K3 (mA/MC · MHz)

0.015

0.015

0.015

0.015

9

Share Link: