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ATF20V8B-15SI Datasheet(PDF) 6 Page - ATMEL Corporation |
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ATF20V8B-15SI Datasheet(HTML) 6 Page - ATMEL Corporation |
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6 / 22 page  ATF20V8B(Q)(L) 6 Input and I/O Pull-ups All ATF20V8B family members have internal input and I/O pull-up resistors. Therefore, whenever inputs or I/Os are not being driven externally, they will float to V CC. This ensures that all logic array inputs are at known states. These are relatively weak active pull-ups that can easily be overdriven by TTL-compatible drivers (see input and I/O diagrams below). Input Diagram I/O Diagram Functional Logic Diagram Description The Logic Option and Functional Diagrams describe the ATF20V8B architecture. Eight configurable macrocells can be configured as a registered output, combinatorial I/O, combinatorial output, or dedicated input. The ATF20V8B can be configured in one of three different modes. Each mode makes the ATF20V8B look like a dif- ferent device. Most PLD compilers can choose the right mode automatically. The user can also force the selection by supplying the compiler with a mode selection. The deter- mining factors would be the usage of register versus com- binatorial outputs and dedicated outputs versus outputs with output enable control. The ATF20V8B universal architecture can be programmed to emulate many 24-pin PAL devices. These architectural subsets can be found in each of the configuration modes described in the following pages. The user can download the listed subset device JEDEC programming file to the PLD programmer, and the ATF20V8B can be configured to act like the chosen device. Check with your programmer manufacturer for this capability. Unused product terms are automatically disabled by the compiler to decrease power consumption. A security fuse, when programmed, protects the content of the ATF20V8B. Eight bytes (64 fuses) of User Signature are accessible to the user for purposes such as storing project name, part number, revision, or date. The User Signature is accessi- ble regardless of the state of the security fuse. |
Similar Part No. - ATF20V8B-15SI |
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Similar Description - ATF20V8B-15SI |
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