RT3PE3000L-1FG484B datasheet(17/144 Pages) ACTEL

부품명	RT3PE3000L-1FG484B

상세설명	Radiation-Tolerant ProASIC3 Low-Power Space- Flight Flash FPGAs

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Radiation-Tolerant ProASIC3 DC and Switching Characteristics

Ad vance v0.1

2-5

PLL Behavior at Brownout Condition

Actel recommends using monotonic power supplies or voltage regulators to ensure proper power-

up behavior. Power ramp-up should be monotonic, at least until VCC and VCCPLX exceed brownout

activation levels. The VCC activation level is specified as 1.1 V worst-case (see Figure 2-2 and

Figure 2-3 on page 2-6 for more details).

When PLL power supply voltage and/or VCC levels drop below the VCC brownout levels (0.75 V

± 0.25 V), the PLL output lock signal goes low and/or the output clock is lost. Refer to the Power-

Up/-Down Behavior of Low-Power Flash Devices chapter of the handbook for information on clock

and lock recovery.

Internal Power-Up Activation Sequence

1. Core

2. Input buffers

Output buffers, after 200 ns delay from input buffer activation.

Figure 2-2 • Devices Operating at 1.5 V Core – 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 V

CCI

/V

CC

are below

specification. For the same reason, input

buffers do not meet V

IH

/V

IL

levels, and

output buffers do not meet V

OH

/V

OL

levels.

Min V

CCI datasheet specification

voltage at a selected I/O

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

or 2.3 V or 3.0 V

VCC

VCC = 1.425 V

Region 1: I/O Buffers are OFF

Activation trip point:

Va = 0.85 V ± 0.25 V

Deactivation trip point:

Vd = 0.75 V ± 0.25 V

Activation trip point:

Va = 0.9 V ± 0.3 V

Deactivation trip point:

Vd = 0.8 V ± 0.3 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, V

IH

/V

IL

, V

OH

/V

OL

, etc.

Region 4: I/O

buffers are ON.

I/Os are functional

(except differential

but slower because V

CCI is

below specification. For the

same reason, input buffers do not

meet V

IH

/V

IL

levels, and output

buffers do not meet V

OH

/V

OL

levels.

Region 4: I/O

buffers are ON.

I/Os are functional

(except differential inputs)

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 V

CC

is below specification.

V

CC = VCCI + VT

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