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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 will occur in a single device or in a serial expansion scheme. The lower 2 lines describe the operation under abnormal conditions on the cascading inputs. These conditions occur when the parallel expansion technique is used. January 1995 4 Philips Semiconductors Product specification 4-bit magnitude comparator AC CHARACTERISTICS VSS = 0 V; Tamb = 25 C; CL = 50 pF; input transition times 20 ns VDD V Propagation delays An, Bn On HIGH to LOW 5 10 15 5 LOW to HIGH In On HIGH to LOW 10 15 5 10 15 5 LOW to HIGH Output transition times HIGH to LOW 10 15 5 10 15 5 LOW to HIGH 10 15 tTLH tTHL tPLH tPHL tPLH tPHL 160 65 45 150 60 45 110 45 30 120 50 35 60 30 20 60 30 20 320 ns 130 ns 90 ns 300 ns 120 ns 90 ns 220 ns 90 ns 60 ns 240 ns 100 ns 70 ns 120 ns 60 ns 40 ns 120 ns 60 ns 40 ns SYMBOL MIN. TYP. MAX. HEF4585B MSI TYPICAL EXTRAPOLATION FORMULA 133 ns + (0,55 ns/pF) CL 54 ns + (0,23 ns/pF) CL 37 ns + (0,16 ns/pF) CL 123 ns + (0,55 ns/pF) CL 49 ns + (0,23 ns/pF) CL 37 ns + (0,16 ns/pF) CL 83 ns + (0,55 ns/pF) CL 34 ns + (0,23 ns/pF) CL 22 ns + (0,16 ns/pF) CL 93 ns + (0,55 ns/pF) CL 39 ns + (0,23 ns/pF) CL 27 ns + (0,16 ns/pF) CL 10 ns + (1,0 ns/pF) CL 9 ns + (0,42 ns/pF) CL 6 ns + (0,28 ns/pF) CL 10 ns + (1,0 ns/pF) CL 9 ns + (0,42 ns/pF) CL 6 ns + (0,28 ns/pF) CL VDD V Dynamic power dissipation per package (P) 5 10 15 TYPICAL FORMULA FOR P (W) 1250 fi + (foCL) x VDD2 5500 fi + (foCL) x 15 000 fi + (foCL) x VDD2 VDD2 where fi = input freq. (MHz) fo = output freq. (MHz) CL = load capacitance (pF) (foCL) = sum of outputs VDD = supply voltage (V) APPLICATION INFORMATION Some examples of applications for the HEF4585B are: * Process controllers. * Servo-motor control. January 1995 5 Philips Semiconductors Product specification 4-bit magnitude comparator HEF4585B MSI Fig.4 Example of cascading comparators. January 1995 6 |
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