AGL015 datasheet(21/248 Pages) MICROSEMI

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IGLOO Low Power Flash FPGAs

Re vi s i on 19

2-5

Thermal Characteristics

Introduction

The temperature variable in the Designer software refers to the junction temperature, not the ambient

temperature. This is an important distinction because dynamic and static power consumption cause the

chip junction to be higher than the ambient temperature.

EQ 1 can be used to calculate junction temperature.

TJ = Junction Temperature = ΔT + TA

EQ 1

where:

TA = Ambient Temperature

ΔT = Temperature gradient between junction (silicon) and ambient ΔT = θ

ja * P

ja = Junction-to-ambient of the package. θja numbers are located in Table 2-5 on page 2-6.

P = Power dissipation

Figure 2-2 •

V2 Devices – I/O State as a Function of VCCI and VCC Voltage Levels

Region 1: I/O buffers are OFF

Region 2: I/O buffers are ON.

I/Os are functional (except differential inputs)

but slower because VCCI/VCC are below

specification. For the same reason, input

buffers do not meet VIH/VIL levels, and

output buffers do not meet VOH/VOL levels.

Min VCCI datasheet specification

voltage at a selected I/O

standard; i.e., 1.14 V,1.425 V, 1.7 V,

2.3 V, or 3.0 V

VCC

VCC = 1.14 V

Region 1: I/O Buffers are OFF

Activation trip point:

a = 0.85 V ± 0.2 V

Deactivation trip point:

d = 0.75 V ± 0.2 V

Activation trip point:

a = 0.9 V ± 0.15 V

Deactivation trip point:

d = 0.8 V ± 0.15 V

VCC = 1.575 V

Region 5: I/O buffers are ON

and power supplies are within

specification.

I/Os meet the entire datasheet

and timer specifications for

speed, VIH / VIL , VOH / VOL , etc.

Region 4: I/O

buffers are ON.

I/Os are functional

(except differential inputs)

but slower because VCCI is

below specification. For the

same reason, input buffers do not

meet VIH / VIL levels, and output

buffers do not meet VOH / VOL levels.

where VT can be from 0.58 V to 0.9 V (typically 0.75 V)

VCCI

Region 3: I/O buffers are ON.

I/Os are functional; I/O DC

specifications are met,

but I/Os are slower because

the VCC is below specification.

VCC = VCCI + VT

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