參數(shù)資料
型號(hào)： ATF2500CQ-25GM/883
廠商： ATMEL CORP
元件分類： PLD
英文描述： EE PLD, 25 ns, CDIP40
封裝： 0.600 INCH, CERDIP-40
文件頁(yè)數(shù)： 29/34頁(yè)
文件大?。?/td> 700K
代理商： ATF2500CQ-25GM/883
4
ATF2500C Family
0777F–08/01
Preload and
Observability of
Registered
Outputs
The ATF2500Cs registers are provided with circuitry to allow loading of each register asyn-
chronously 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 V
IH level on the odd I/O pins will force the
appropriate register high; a V
IL will force it low, independent of the polarity or other configura-
tion bit settings.
The PRELOAD state is entered by placing an 10.25V to 10.75V signal on SMP lead 42. When
the preload clock SMP lead 23 is pulsed high, the data on the I/O pins is placed into the 12
registers chosen by the Q select and even/odd select pins.
Register 2 observability mode is entered by placing an 10.25V to 10.75V signal on pin/lead 2.
In this mode, the contents of the buried register bank will appear on the associated outputs
when the OE control signals are active.
Programming
Software
Support
As with all other Atmel PLDs, several third party PLD development software products and pro-
grammers will support the ATF2500Cs.
Additionally, the ATF2500C may be programmed to perform the ATV2500H/Ls functional sub-
set (no T-type flip-flops, pin clocking or D/T2 feedback) using the ATV2500H/L JEDEC file. In
this case, the ATF2500C becomes a direct replacement or speed upgrade for the
ATV2500H/L (additional GND connections are required). Please refer to the Programmable
Logic Development Tools section for a complete PLD software and programmer listing.
Security Fuse
Usage
A single fuse is provided to prevent unauthorized copying of ATF2500C fuse patterns. Once
programmed, the outputs will read programmed during verify.
The security fuse should be programmed last, as its effect is immediate.
The security fuse also inhibits Preload and Q2 observability.
Input and I/O
Pull-ups
All ATF2500C family members have programmable internal input and I/O pinkeeper circuits.
When pinkeepers are active, inputs or I/Os not being driven externally will maintain their last
driven state. This ensures that all logic array inputs and device outputs are known states.
Pinkeepers are relatively weak active circuits that can be easily overridden by TTL-compatible
drivers (see input and I/O diagrams below).
相關(guān)PDF資料
PDF描述
ATF2500CQ-25JC EE PLD, 25 ns, PQCC44
ATF2500CQ-25JI EE PLD, 25 ns, PQCC44
ATF2500CQ-25KM/883 EE PLD, 25 ns, CQCC44
ATF2500CQ-25NM/883 EE PLD, 25 ns, CQCC44
ATF2500CQ-25PC EE PLD, 25 ns, PDIP40
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