ATF16V8CZ-15XC(1998) Просмотр технического описания (PDF) - Atmel Corporation
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ATF16V8CZ-15XC Datasheet PDF : 10 Pages
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Registered Output Preload
The ATF16V8CZ’s registers are provided with circuitry to
allow loading of each register with either a high or a low.
This feature will simplify testing since any state can be
forced into the registers to control test sequencing. A
JEDEC file with preload is generated when a source file
with vectors is compiled. Once downloaded, the JEDEC
file preload sequence will be done automatically by ap-
proved programmers.
Input and I/O Pin Keeper Circuits
The ATF16V8CZ contains internal input and I/O pin
keeper circuits. These circuits allow each ATF16V8CZ pin
to hold its previous value even when it is not being driven
by an external source or by the device’s output buffer. This
helps insure that all logic array inputs are at known, valid
logic levels. This reduces system power by preventing
pins from floating to indeterminate levels. By using pin
keeper circuits rather than pull-up resistors, there is no DC
Input Diagram
Security Fuse Usage
A single fuse is provided to prevent unauthorized copying
of the ATF16V8CZ 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.
current required to hold the pins in either logic state (high
or low).
These pin keeper circuits are implemented as weak feed-
back inverters, as shown in the Input Diagram below.
These keeper circuits can easily be overdriven by stand-
ard TTL- or CMOS-compatible drivers. The typical over-
drive current required is 40 µA.
I/O Diagram
Compiler Mode Selection
Registered
Complex
ABEL, Atmel-ABEL P16V8R
P16V8C
CUPL
LOG/iC
OrCAD-PLD
G16V8MS
GAL16V8_R (1)
“Registered”
G16V8MA
GAL16V8_C7 (1)
“Complex”
PLDesigner
P16V8R
Tango-PLD
G16V8R
Note: 1. Only applicable for version 3.4 or lower.
P16V8C
G16V8C
6
ATF16V8CZ
Simple
P16V8AS
G16V8AS
GAL16V8_C8 (1)
“Simple”
P16V8C
G16V8AS
Auto Select
P16V8
G16V8A
GAL16V8
GAL16V8A
P16V8A
G16V8
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