atf22v10cqz ATMEL Corporation, atf22v10cqz Datasheet - Page 7

• Manufacturer Part Number: atf22v10cqz
• Description: High- Performance Ee Pld
• Manufacturer: ATMEL Corporation

5. Electronic Signature Word
6. Security Fuse Usage
7. Programming/Erasing
8. Input and I/O Pull-ups
0778J–PLD–11/07
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 ATF22V10CZ/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.
Figure 7-1.
Table 7-1.
All ATF22V10CZ/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).
Parameter
T
V
PR
RST
Programming/Erasing Timing
Programming/Erasing
POWER
REGISTERED
OUTPUTS
C LOCK
Description
Power-up
Reset Time
Power-up
Reset Voltage
V
R
ST
t
PR
Typ
600
3.8
t
W
t
S
ATF22V10C(Q)Z
1000
Max
4.5
Units
ns
V
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