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HEF4585B Datasheet(PDF) 2 Page - NXP Semiconductors |
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HEF4585B Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 6 page January 1995 2 Philips Semiconductors Product specification 4-bit magnitude comparator HEF4585B MSI DESCRIPTION The HEF4585B is a 4-bit magnitude comparator which compares two 4-bit words (A and B), whether they are ‘less than’, ‘equal to’, or ‘greater than’. Each word has four parallel inputs (A0 to A3 and B0 to B3); A3 and B3 being the most significant inputs. Three outputs are provided; A greater than B (OA > B), A less than B (OA < B) and A equal to B (OA=B). Three expander inputs (IA > B, IA < B and IA=B) allow cascading of the devices without external gates. For proper compare operation the expander inputs to the least significant position must be connected as follows: IA=B =IA > B = HIGH, IA < B = LOW. For words greater than 4-bits, units can be cascaded by connecting outputs OA<B and OA=B to the corresponding inputs of the next significant comparator (input IA>B is connected to a HIGH). Operation is not restricted to binary codes, the devices will work with any monotonic code. The function table describes the operation of the device under all possible logic conditions. Fig.1 Functional diagram. PINNING FAMILY DATA, IDD LIMITS category MSI See Family Specifications HEF4585BP(N): 16-lead DIL; plastic (SOT38-1) HEF4585BD(F): 16-lead DIL; ceramic (cerdip) (SOT74) HEF4585BT(D): 16-lead SO; plastic (SOT109-1) ( ): Package Designator North America A0 to A3 word A parallel inputs B0 to B3 word B parallel inputs IA > B, IA < B, IA=B expander inputs OA>B A greater than B output OA<B A less than B output OA=B A equal to B output Fig.2 Pinning diagram. |
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