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SN54LS85 Datasheet(PDF) 1 Page - Motorola, Inc |
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SN54LS85 Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 4 page 5-84 FAST AND LS TTL DATA 4-BIT MAGNITUDE COMPARATOR The SN54 / 74LS85 is a 4-Bit Magnitude Camparator which compares two 4-bit words (A, B), each word having four Parallel Inputs (A0–A3, B0–B3); A3, B3 being the most significant inputs. Operation is not restricted to binary codes, the device will work with any monotonic code. Three Outputs are provided: “A greater than B” (OA> B), “A less than B” (OA< B), “A equal to B” (OA= B). Three Expander Inputs, IA> B, IA< B, IA= B, allow cascading without external gates. For proper compare operation, the Expander Inputs to the least significant position must be connected as follows: IA< B= IA> B = L, IA= B = H. For serial (ripple) expansion, the OA> B, OA< B and OA= B Outputs are connected respectively to the IA> B, IA< B, and IA= B Inputs of the next most significant comparator, as shown in Figure 1. Refer to Applications section of data sheet for high speed method of comparing large words. The Truth Table on the following page describes the operation of the SN54 / 74LS85 under all possible logic conditions. The upper 11 lines describe the normal operation under all conditions that will occur in a single device or in a series expansion scheme. The lower five lines describe the operation under abnormal conditions on the cascading inputs. These conditions occur when the parallel expansion technique is used. • Easily Expandable • Binary or BCD Comparison • OA>B, OA<B, and OA=B Outputs Available CONNECTION DIAGRAM DIP (TOP VIEW) NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 14 13 12 11 10 9 1 2 3 4 5 6 7 16 15 8 VCC B3 A3 B2 A2 A1 A0 B1 B0 IA<B IA=B IA>B OA>B OA=B OA<B GND PIN NAMES LOADING (Note a) HIGH LOW A0 – A3, B0 – B3 IA = B IA < B, IA > B OA > B OA < B OA = B Parallel Inputs A = B Expander Inputs A < B, A > B, Expander Inputs A Greater Than B Output (Note b) B Greater Than A Output (Note b) A Equal to B Output (Note b) 1.5 U.L. 1.5 U.L. 0.5 U.L. 10 U.L. 10 U.L. 10 U.L. 0.75 U.L. 0.75 U.L. 0.25 U.L. 5 (2.5) U.L. 5 (2.5) U.L. 5 (2.5) U.L. NOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges. SN54/74LS85 4-BIT MAGNITUDE COMPARATOR LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 N SUFFIX PLASTIC CASE 648-08 16 1 16 1 ORDERING INFORMATION SN54LSXXJ Ceramic SN74LSXXN Plastic SN74LSXXD SOIC 16 1 D SUFFIX SOIC CASE 751B-03 LOGIC SYMBOL VCC = PIN 16 GND = PIN 8 10 12 13 15 9 11 14 1 4 2 3 5 7 6 A0 A1 A2 A3 B0 B1 B2 B3 IA>B IA<B IA=B OA>B OA<B OA=B |
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