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ATF750LVC-15PC Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATF750LVC-15PC Datasheet(HTML) 9 Page - ATMEL Corporation |
9 / 14 page ATF750LVC 9 Using the ATF750LVC’s Many Advanced Features The ATF750LVC’s advanced flexibility packs more usable gates into 24-pins than any other logic device. The ATF750LVCs start with the popular 22V10 architecture, and add several enhanced features: • Selectable D- and T-type Registers Each ATF750LVC flip-flop can be individually configured as either D- or T-type. Using the T-type configuration, JK and SR flip-flops are also easily created. These options allow more efficient product term usage. • Selectable Asynchronous Clocks Each of the ATF750LVC’s flip-flops may be clocked by its own clock product term or directly from Pin 1 (SMD Lead 2). This removes the constraint that all registers must use the same clock. Buried state machines, counters and registers can all coexist in one device while running on separate clocks. Individual flip-flop clock source selection further allows mixing higher performance pin clocking and flexible product term clocking within one design. • A Full Bank of Ten More Registers The ATF750LVC provides two flip-flops per output logic cell for a total of 20. Each register has its own sum term, its own reset term and its own clock term. • Independent I/O Pin and Feedback Paths Each I/O pin on the ATF750LVC has a dedicated input path. Each of the 20 registers has its own feedback terms into the array as well. This feature, combined with individual product terms for each I/O’s output enable, facilitates true bi-directional I/O design. Synchronous Preset and Asynchronous Reset One synchronous preset line is provided for all 20 registers in the ATF750LVC. The appropriate input signals to cause the internal clocks to go to a high state must be received during a synchronous preset. Appropriate setup and hold times must be met, as shown in the switching waveform diagram. An individual asynchronous reset line is provided for each of the 20 flip-flops. Both master and slave halves of the flip- flops are reset when the input signals received force the internal resets high. Security Fuse Usage A single fuse is provided to prevent unauthorized copying of the ATF750LVC fuse patterns. Once the security fuse is programmed, all fuses will appear programmed during verify. The security fuse should be programmed last, as its effect is immediate. |
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Similar Description - ATF750LVC-15PC |
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