atf22lv10cqz ATMEL Corporation, atf22lv10cqz Datasheet - Page 7

• Manufacturer Part Number: atf22lv10cqz
• Description: High- Performance Ee Pld
• Manufacturer: ATMEL Corporation

5. Electronic Signature Word
6. Security Fuse Usage
7. Programming/Erasing
8. Input and I/O Pin Keepers
0779L–PLD–12/05
with vectors is compiled. Once downloaded, the JEDEC file preload sequence will be done auto-
matically by most of the approved programmers after the programming.
There are 64 bits of programmable memory that are always available to the user, even if the
device is secured. These bits can be used for user-specific data.
A single fuse is provided to prevent unauthorized copying of the ATF22LV10CZ/CQZ fuse pat-
terns. 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 is performed using standard PLD programmers. See CMOS PLD Pro-
gramming Hardware & Software Support for information on software/ programming.
Table 7-1.
All ATF22LV10CZ/CQZ family members have internal input and I/O pin-keeper circuits. There-
fore, 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).
Figure 8-1.
Parameter
T
V
PR
RST
Programming/Erasing
Input Diagram
INPUT
Description
Power-up
Reset Time
Power-up
Reset Voltage
PROTECTION
CIRCUIT
ESD
Typ
600
2.3
100K
ATF22LV10C(Q)Z
1000
Max
2.7
V
CC
Units
ns
V
7