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PALCE16V8 Family

GENERAL DESCRIPTION

An improved PAL device called the PALCE16V8 was created using low-power, high-speed, electrically erasable CMOS technology. All 20-pin GAL devices are functionally compatible with it. A ubiquitous device architecture is provided by the macrocells. With the exception of the PAL16C1, the PALCE16V8 will directly replace the PAL16R8. The PALCE16V8Z offers high speed and no standby power. The PALCE16V8Z enables prolonged battery-powered operation with a maximum standby current of 30 A. The PALCE16V8 employs the well-known sum-of-products (AND/OR) architecture, allowing users to quickly and effectively design complex logic operations. Combinatorial logic at several levels can always be converted to sum-of-products form by making use of the extremely wide input gates included in PAL devices. Through electrically erasable floating-gate cells in the AND logic array, the equations are encoded into the gadget. For logic functions, the fixed OR array permits up to eight data product terms per output. The output macrocell is fed by the aggregate of these products. Each macrocell has a registered or combinatorial active-high or active-low output that can be configured. Four multiplexers are controlled by two global bits and one local bit in each macrocell, which decide the output configuration.

FUNCTION DESCRIPTION

The PALCE16V8 is an all-purpose PAL gadget. The zero-power variant of the PALCE16V8 is the PALCE16V8Z. It has all the PALCE16V8's architectural elements. The PALCE16V8Z also includes zero standby power and a power-saving function called unneeded product term disable. Eight independently programmable macrocells (MC0-MC7) make up this device. Each macrocell can be set up as a dedicated input, registered output, combinatorial output, or combinatorial I/O. A fixed OR logic array is driven by a programmable AND logic array that is implemented in the programming matrix. In order to enable user-programmable input signal polarity, buffers for device inputs include complimentary outputs. For all flip-flops, pins 1 and 11 are either used as array inputs or as the clock (CLK) and output enable (OE), respectively. Unused input pins ought to be connected directly to GND or VCC. Product terms with both the true and complement of any input signal connected assume a logical LOW state, while product terms with all bits unprogrammed (disconnected) assume the logical HIGH state. The user's design specification is automatically used to configure the programmable features on the PALCE16V8. Development software processes the design specification to validate the design and generate a programming file (JEDEC). When this file is downloaded to a programmer, the device is configured to perform the user's intended function. The PALCE16V8 offers the customer two design possibilities. It can first be set up as a PAL16R8 series regular PAL device. Device codes for the PALCE16V8's compatible standard PAL device architectures will be provided by the PAL programmer manufacturer. The PALCE16V8 will be programmed in the appropriate architecture by the programmer. By doing this, the user can use the JEDEC files for conventional PAL devices without altering them.The device can also be set up to function as a PALCE16V8. The PALCE16V8 device code must be entered in this case. The macrocell may be used entirely with this choice.

FEATURE

◆ Pin and function compatible with all 20-pin PAL devices

◆ Electrically erasable CMOS technology provides reconfigurable logic and full testability

◆ High-speed CMOS technology

— 5-ns propagation delay for “-5” version

— 7.5-ns propagation delay for “-7” version

◆ Direct plug-in replacement for the PAL16R8 series

◆ Outputs programmable as registered or combinatorial in any combination

◆ Peripheral Component Interconnect (PCI) compliant

◆ Programmable output polarity

◆ Programmable enable/disable control

◆ Preloadable output registers for testability