Programmable Array Logic Circuits

What is a programmable array logic circuit (PAL)?


Programmable array logic (PAL) are semiconductors that are used to implement combinational logic circuits. They have a programmable AND gate array with fixed OR gate array. PAL’s contain PROM (programmable read only memory) and output logic. PAL is a group of PLD (programmable logic device). They’re also faster due to only having a single programmable array.


Features & Benefits


Programmable array logic is typically cheaper to produce & buy rather than the conventional programmable logic array (PLA). Compared to other programmable logic devices (PLD) they typically have higher efficiency, high reliability with only 1 programmable gate, less power consumption and more secure.


With the PAL being easier to program than a PLA there are multiple languages to program PALs in. These include PAL assembler (PALASM), Advanced Boolean expression language (ABEL) and universal programmable logic (CUPL). Programming PAL is very similar to PLA programming, except only the AND gate array needs to be programmed on the PAL.


How does a PAL differ from a PLA?


A PLA (Programmable Logic Array) has both an AND array gate and an OR gate array both available to be programmed, whereas PAL only allows the AND array to be programmed. Other differences include that PLA is slower, less efficient on power consumption and less prolific.


Typical applications


Programmable array logic circuits are typically used in a FPGA (Field Programmable Gate Array). This allows for accelerated testing of systems through programs such as Xilinx.


With the PAL being arranged in a FPGA you can compile test & edit very quickly compared to other arrangements.


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Description Price Maximum Internal Frequency Package Type Pin Count Dimensions Length Width Height Maximum Operating Supply Voltage Maximum Operating Temperature Minimum Operating Supply Voltage Minimum Operating Temperature Priced to Clear Mounting Type
RS Stock No. 545-8707
Mfr. Part No.EPCS4SI8N
BrandAltera
£12.82
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20MHz SOIC 8 4.9 x 3.9 x 1.65mm 4.9mm 3.9mm 1.65mm 3.6 V +85 °C 2.7 V -40 °C Yes Surface Mount
RS Stock No. 173-2061
Mfr. Part No.XCF04SVOG20C
BrandXilinx
£14.197
Each (In a Tray of 74)
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- TSSOP 20 6.5 x 4.39 x 1.04mm 6.5mm 4.39mm 1.04mm 3.6 V +85 °C 3 V -40 °C - Surface Mount
RS Stock No. 697-3496
Mfr. Part No.XCF04SVOG20C
BrandXilinx
£15.62
Each
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- TSSOP 20 6.5 x 4.39 x 1.04mm 6.5mm 4.39mm 1.04mm 3.6 V +85 °C 3 V -40 °C - Surface Mount
RS Stock No. 690-4400
Mfr. Part No.EPCS16SI8N
BrandAltera
£15.06
Each
Units
20MHz SOIC 8 4.9 x 3.9 x 1.65mm 4.9mm 3.9mm 1.65mm 3.6 V +85 °C 2.7 V -40 °C Yes Surface Mount
RS Stock No. 697-3301
Mfr. Part No.XCF32PVOG48C
BrandXilinx
£54.36
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- TSOP 48 12.1 x 18.5 x 1mm 12.1mm 18.5mm 1mm 2 V +85 °C 1.65 V -40 °C - Surface Mount
RS Stock No. 626-0955
Mfr. Part No.XCF02SVOG20C
BrandXilinx
£9.44
Each
Units
- TSSOP 20 6.5 x 4.39 x 1.04mm 6.5mm 4.39mm 1.04mm 3.6 V +85 °C 3 V -40 °C - Surface Mount
RS Stock No. 173-2057
Mfr. Part No.XCF02SVOG20C
BrandXilinx
£8.579
Each (In a Tray of 74)
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- TSSOP 20 6.5 x 4.39 x 1.04mm 6.5mm 4.39mm 1.04mm 3.6 V +85 °C 3 V -40 °C - Surface Mount
RS Stock No. 169-5485
Mfr. Part No.EPC2TC32N
BrandAltera
£21.411
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16.7MHz TQFP 32 7 x 7 x 1mm 7mm 7mm 1mm 5.25 V +70 °C 3 V 0 °C - Surface Mount
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