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ATF16V8C-7SC Datasheet(PDF) 7 Page - ATMEL Corporation |
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ATF16V8C-7SC Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 23 page 7 0425H–PLD–3/11 Atmel ATF16V8C 11. Security fuse usage A single fuse is provided to prevent unauthorized copying of the ATF16V8C fuse patterns. Once programmed, fuse verify and preload are inhibited. However, the 64-bit user signature remains accessible. The security fuse will be programmed last, as its effect is immediate. 12. Input and I/O pin-keeper circuits The ATF16V8C contains internal input and I/O pin-keeper circuits. These circuits allow each ATF16V8C 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 current required to hold the pins in either logic state (high or low). These pin-keeper circuits are implemented as weak feedback inverters, as shown in the Input Diagram below. These keeper circuits can easily be overdriven by standard TTL- or CMOS-compatible drivers. The typical overdrive current required is 40μA. Figure 13. Input diagram Figure 14. I/O diagram |
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