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INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: · The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC · The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC HEF4585B MSI 4-bit magnitude comparator Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification 4-bit magnitude comparator 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. HEF4585B MSI 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.2 Pinning diagram. HEF4585BP(N): HEF4585BD(F): HEF4585BT(D): 16-lead DIL; plastic (SOT38-1) 16-lead DIL; ceramic (cerdip) (SOT74) 16-lead SO; plastic (SOT109-1) ( ): Package Designator North America PINNING A0 to A3 Fig.1 Functional diagram. B0 to B3 OA > B OA < B OA = B word A parallel inputs word B parallel inputs A greater than B output A less than B output A equal to B output IA > B, IA < B, IA = B expander inputs FAMILY DATA, IDD LIMITS category MSI See Family Specifications January 1995 2 Philips Semiconductors Product specification 4-bit magnitude comparator HEF4585B MSI Fig.3 Logic diagram. January 1995 3 Philips Semiconductors Product specification 4-bit magnitude comparator FUNCTION TABLE COMPARING INPUTS A3, B3 A3 > B3 A3 < B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 Notes 1. H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial A2, B2 X X A2 > B2 A2 < B 2 A2 = B 2 A2 = B 2 A2 = B 2 A2 = B 2 A2 = B 2 A2 = B 2 A2 = B 2 A2 = B 2 A2 = B 2 A1, B1 X X X X A1 > B 1 A1 < B 1 A1 = B 1 A1 = B 1 A1 = B 1 A1 = B 1 A1 = B 1 A1 = B 1 A1 = B 1 A0, B0 X X X X X X A0 > B 0 A0 < B0 A0 = B 0 A0 = B 0 A0 = B 0 A0 = B 0 A0 = B 0 CASCADING INPUTS IA > B H X H X H X H X X H X X L IA < B X X X X X X X X L L H H L IA = B X X X X X X X X H L L H L OA > B H L H L H L H L L H L L L HEF4585B MSI OUTPUTS OA < B L H L H L H L H L L H H L OA = B L L L L L L L L H L L H L The upper 11 lines describe the normal operation under all conditions that w