Rainbow-electronics ATF20V8CQZ Manual de usuario descargar pdf (Pagina 3)

ATF20V8C Family

0408H–04/01

Security Fuse Usage

A single fuse is provided to prevent unauthorized copying

of the ATF20V8C’s fuse patterns. Once programmed, fuse

verify and preload are inhibited. However, the 64-bit User

Signature remains accessible.

The security fuse should be programmed last, as its effect

is immediate.

Programming/Erasing

Programming/erasing is performed using standard PLD

programmers. For further information, see the Configurable

Logic data book section titled, “CMOS PLD Programming

Hardware and Software Support.”

Input and I/O Pull-ups

All ATF20V8C family members have internal input and I/O

“pin-keeper” circuits. Therefore, whenever inputs or I/Os

are not being driven externally, they will maintain their last

driven state. This ensures that all logic array inputs and

device outputs are at known states. These are relatively

weak active circuits that can be easily overridden by TTL-

compatible drivers (see input and I/O diagrams below).

Input Diagram

I/O Diagram

100K

ESD

PROTECTION

CIRCUIT

INPUT

100K

DATA

I/O

INPUT

1 2 3 4 5 6 7 8 ... 29 30

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Rainbow-electronics ATF20V8CQZ Manual de usuario Pagina 3