OR2C04A datasheet(62/192 Pages) ETC

62 / 192 page

Lucent Technologies Inc.

Data Sheet

ORCA Series 2 FPGAs

June 1999

Estimating Power Dissipation (continued)

OR2C06A Clock Power

= [0.63 mW/MHz

+ (0.25 mW/MHz – Branch) (# Branches)

+ (0.022 mW/MHz – PFU) (# PFUs)

+ (0.006 mW/MHz – SMEM_PFU)

(# SMEM_PFUs)] fCLK

For a quick estimate, the worst-case (typical circuit)

OR2C06A clock power

≈ 5.3 mW/MHz.

OR2C08A Clock Power

= [0.65 mW/MHz

+ (0.29 mW/MHz – Branch) (# Branches)

+ (0.022 mW/MHz – PFU) (# PFUs)

+ (0.006 mW/MHz – SMEM_PFU)

(# SMEM_PFUs)] fCLK

For a quick estimate, the worst-case (typical circuit)

OR2C08A clock power

≈ 6.6 mW/MHz.

OR2C10A Clock Power

= [0.66 mW/MHz

+ (0.32 mW/MHz – Branch) (# Branches)

+ (0.022 mW/MHz – PFU) (# PFUs)

+ (0.006 mW/MHz – SMEM_PFU)

(# SMEM_PFUs)] fCLK

For a quick estimate, the worst-case (typical circuit)

OR2C10A clock power

≈ 8.6 mW/MHz.

OR2C12A Clock Power

= [0.68 mW/MHz

+ (0.35 mW/MHz – Branch) (# Branches)

+ (0.022 mW/MHz – PFU) (# PFUs)

+ (0.006 mW/MHz – SMEM_PFU)

(# SMEM_PFUs)] fCLK

For a quick estimate, the worst-case (typical circuit)

OR2C12A clock power

≈ 10.5 mW/MHz.

OR2C15A Clock Power

= [0.69 mW/MHz

+ (0.38 mW/MHz – Branch) (# Branches)

+ (0.022 mW/MHz – PFU) (# PFUs)

+ (0.006 mW/MHz – SMEM_PFU)

(# SMEM_PFUs)] fCLK

For a quick estimate, the worst-case (typical circuit)

OR2C15A clock power

≈ 12.7 mW/MHz.

OR2C26A Clock Power

= [0.73 mW/MHz

+ (0.44 mW/MHz – Branch) (# Branches)

+ (0.022 mW/MHz – PFU) (# PFUs)

+ (0.006 mW/MHz – SMEM_PFU)

(# SMEM_PFUs)] fCLK

For a quick estimate, the worst-case (typical circuit)

OR2C26A clock power

≈ 17.8 mW/MHz.

OR2C40A Clock Power

= [0.77 mW/MHz

+ (0.53 mW/MHz – Branch) (# Branches)

+ (0.022 mW/MHz – PFU) (# PFUs)

+ (0.006 mW/MHz – SMEM_PFU)

(# SMEM_PFUs)] fCLK

For a quick estimate, the worst-case (typical circuit)

OR2C40A clock power

≈ 26.6 mW/MHz.

The power dissipated in a PIC is the sum of the power

dissipated in the four I/Os in the PIC. This consists of

power dissipated by inputs and ac power dissipated by

outputs. The power dissipated in each I/O depends on

whether it is configured as an input, output, or input/

output. If an I/O is operating as an output, then there is

a power dissipation component for PIN, as well as

POUT. This is because the output feeds back to the

input.

The power dissipated by a TTL input buffer is estimated

as:

PTTL = 2.2 mW + 0.17 mW/MHz

The power dissipated by an input buffer is estimated

as:

PCMOS = 0.17 mW/MHz

The ac power dissipation from an output or bidirec-

tional is estimated by the following:

POUT = (CL + 8.8 pF) x VDD2 x F Watts

where the unit for CL is farads, and the unit for F is Hz.

As an example of estimating power dissipation,

suppose that a fully utilized OR2C15A has an average

of three outputs for each of the 400 PFUs, that all

20 clock branches are used, that 150 of the 400 PFUs

have FFs clocked at 40 MHz (16 of which are operating

in a synchronous memory mode), and that the PFU

outputs have an average activity factor of 20%.

Twenty TTL-configured inputs, 20 CMOS-configured

inputs, 32 outputs driving 30 pF loads, and 16 bidirec-

tional I/Os driving 50 pF loads are also generated from

the 40 MHz clock with an average activity factor of

20%. The worst-case (VDD = 5.25 V) power dissipation

is estimated as follows:

PPFU = 400 x 3 (0.16 mW/MHz x 20 MHz x 20%)

= 768 mW

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