SN74LS85 4-Bit Magnitude Comparator The SN74LS85 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 SN74LS85 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 http://onsemi.com LOW POWER SCHOTTKY 16 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B GUARANTEED OPERATING RANGES Symbol VCC Parameter Supply Voltage Min Typ Max Unit 4.75 5.0 5.25 V 0 25 70 C 1 SOEIAJ M SUFFIX CASE 966 TA Operating Ambient Temperature Range IOH Output Current - High -0.4 mA IOL Output Current - Low 8.0 mA 16 ORDERING INFORMATION Device Package Shipping SN74LS85N 16 Pin DIP 2000 Units/Box SN74LS85D SOIC-16 38 Units/Rail SN74LS85DR2 SOIC-16 2500/Tape & Reel SN74LS85M SOEIAJ-16 See Note 1 SN74LS85MEL SOEIAJ-16 See Note 1 1. For ordering information on the EIAJ version of the SOIC package, please contact your local ON Semiconductor representative. Semiconductor Components Industries, LLC, 2001 October, 2001 - Rev. 7 1 Publication Order Number: SN74LS85/D SN74LS85 CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 A3 15 B2 14 A2 13 A1 12 B1 11 A0 10 B0 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual InLine Package. 1 B3 8 2 3 4 5 6 7 IA<B IA=B IA>B OA>B OA=B OA<B GND LOADING (Note a) PIN NAMES 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 B Greater than A Output A Equal to B Output HIGH LOW 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 U.L. 5 U.L. 5 U.L. NOTES: a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW. LOGIC SYMBOL 10 12 13 15 9 11 14 1 4 2 3 A0 A1 A2 A3 B0 B1 B2 B3 OA>B IA>B OA<B IA<B OA=B IA=B VCC = PIN 16 GND = PIN 8 http://onsemi.com 2 5 7 6 SN74LS85 LOGIC DIAGRAM A3 B3 (15) (1) (5) A2 B2 (13) (14) (2) A<B (3) A=B (4) A>B A1 B1 (6) OA=B (12) (11) (7) A0 B0 OA>B OA<B (10) (9) TRUTH TABLE CASCADING INPUTS COMPARING INPUTS A3,B3 A2,B2 A1,B1 A0,B0 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 X X A2>B2 A2<B2 A2=B2 A2=B2 A2=B2 A2=B2 A2=B2 A2=B2 A2=B2 A2=B2 A2=B2 X X X X A1>B1 A1<B1 A1=B1 A1=B1 A1=B1 A1=B1 A1=B1 A1=B1 A1=B1 X X X X X X A0>B0 A0<B0 A0=B0 A0=B0 A0=B0 A0=B0 A0=B0 IA>B X X X X X X X X H L X H L IA<B X X X X X X X X L H X H L http://onsemi.com 3 IA=B X X X X X X X X L L H L L OUTPUTS OA>B OA<B OA=B H L H L H L H L H L L L H L H L H L H L H L H L L H L L L L L L L L L L H L L H = HIGH Level L = LOW Level X = IMMATERIAL A0 A1 A2 A3 B0 B1 B2 B3 IA > B OA > B OA < B IA < B SN74LS85 IA = B OA = B L L H Bn B n1 B n2 B n3 An A n1 A0 A1 A2 A3 B0 B1 B2 B3 A n2 A n3 SN74LS85 A0 A1 A2 A3 B0 B1 B2 B3 OA > B IA > B IA < B SN74LS85 OA < B OA = B IA = B A>B A<B A=B L = LOW LEVEL H = HIGH LEVEL Figure 1. Comparing Two n-Bit Words APPLICATIONS Figure 2 shows a high speed method of comparing two 24-bit words with only two levels of device delay. With the technique shown in Figure 1, six levels of device delay result when comparing two 24-bit words. The parallel technique can be expanded to any number of bits, see Table 1. Table 1 WORD LENGTH NUMBER OF PKGS. 1-4 Bits 5-24 Bits 25-120 Bits 1 2-6 8-31 NOTE: The SN74LS85 can be used as a 5-bit comparator only when the outputs are used to drive the A0-A3 and B0-B3 inputs of another SN74LS85 as shown in Figure 2 in positions #1, 2, 3, and 4. INPUTS (LSB) A0 A1 A2 A3 B0 B1 B2 B3 L A0 A1 A2 A3 B0 B1 B2 B3 IA > B OA > B #5 OA < B IA < B H IA = B L (MSB) A20 A21 A22 A23 B20 B21 B22 B23 A19 B19 L OA = B A0 A1 A2 A3 B0 B1 B2 B3 IA > B OA > B IA < B #1 OA < B IA = B OA = B NC INPUTS A5 A6 A7 A8 B5 B6 B7 B8 A4 B4 L A0 A1 A2 A3 B0 B1 B2 B3 OA > B IA > B #4 IA < B OA < B IA = B OA = B A15 A16 A17 A18 B15 B16 B17 B18 A10 A11 A12 A13 B10 B11 B12 B13 A9 B9 NC L A0 A1 A2 A3 B0 B1 B2 B3 OA > B IA > B #3 OA < B IA < B IA = B OA = B A14 B14 NC L A0 A1 A2 A3 B0 B1 B2 B3 OA > B IA > B #2 OA < B IA < B IA = B OA = B A0 A1 A2 A3 B0 B1 B2 B3 IA > B OA > B IA < B OA < B #6 IA = B OA = B MSB = MOST SIGNIFICANT BIT LSB = LEAST SIGNIFICANT BIT L = LOW LEVEL H = HIGH LEVEL NC = NO CONNECTION Figure 2. Comparison of Two 24-Bit Words http://onsemi.com 4 OUTPUTS NC SN74LS85 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage Typ Max 2.0 0.8 -0.65 2.7 -1.5 3.5 Unit Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = -18 mA V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table 0.25 0.4 V IOL = 4.0 mA 0.35 0.5 V IOL = 8.0 mA 20 60 A VCC = MAX, VIN = 2.7 V mA VCC = MAX, VIN = 7.0 V -0.4 -1.2 mA VCC = MAX, VIN = 0.4 V -100 mA VCC = MAX ICC Power Supply Current 20 mA 2. Not more than one output should be shorted at a time, nor for more than 1 second. VCC = MAX Input HIGH Current A < B, A > B Other Inputs IIH A < B, A > B Other Inputs 0.1 0.3 IIL Input LOW Current A < B, A > B Other Inputs IOS Output Short Circuit Current (Note 2) -20 VCC = VCC MIN, VIN = VIL or VIH per Truth Table AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) Limits Typ Max Unit tPLH tPHL Any A or B to A < B, A > B 24 20 36 30 ns tPLH tPHL Any A or B to A = B 27 23 45 45 ns tPLH tPHL A < B or A = B to A > B 14 11 22 17 ns tPLH tPHL A = B to A = B 13 13 20 26 ns tPLH tPHL A > B or A = B to A < B 14 11 22 17 ns Symbol Min Parameter Test Conditions VCC = 5.0 V CL = 15 pF AC WAVEFORMS VIN 1.3 V 1.3 V tPHL VOUT 1.3 V VIN 1.3 V tPHL tPLH 1.3 V 1.3 V VOUT Figure 3. tPLH 1.3 V 1.3 V Figure 4. http://onsemi.com 5 SN74LS85 PACKAGE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 648-08 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. -A- 16 9 1 8 B F C DIM A B C D F G H J K L M S L S SEATING PLANE -T- K H G D M J 16 PL 0.25 (0.010) T A M M INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0 10 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0 10 0.51 1.01 D SUFFIX PLASTIC SOIC PACKAGE CASE 751B-05 ISSUE J -A- 16 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 9 -B- 1 P 8 PL 0.25 (0.010) 8 M B S G R K F X 45 C -T- SEATING PLANE J M D 16 PL 0.25 (0.010) M T B S A S http://onsemi.com 6 DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0 7 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0 7 0.229 0.244 0.010 0.019 SN74LS85 PACKAGE DIMENSIONS M SUFFIX SOEIAJ PACKAGE CASE 966-01 ISSUE O 16 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS D AND E DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS AND ARE MEASURED AT THE PARTING LINE. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 5. THE LEAD WIDTH DIMENSION (b) DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE LEAD WIDTH DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS OR THE FOOT. MINIMUM SPACE BETWEEN PROTRUSIONS AND ADJACENT LEAD TO BE 0.46 ( 0.018). LE 9 Q1 M E HE 1 8 L DETAIL P Z D e VIEW P A A1 b 0.13 (0.005) c M 0.10 (0.004) http://onsemi.com 7 DIM A A1 b c D E e HE L LE M Q1 Z MILLIMETERS MIN MAX --2.05 0.05 0.20 0.35 0.50 0.18 0.27 9.90 10.50 5.10 5.45 1.27 BSC 7.40 8.20 0.50 0.85 1.10 1.50 10 0 0.70 0.90 --0.78 INCHES MIN MAX --0.081 0.002 0.008 0.014 0.020 0.007 0.011 0.390 0.413 0.201 0.215 0.050 BSC 0.291 0.323 0.020 0.033 0.043 0.059 10 0 0.028 0.035 --0.031 SN74LS85 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: ONlit@hibbertco.com JAPAN: ON Semiconductor, Japan Customer Focus Center 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-0031 Phone: 81-3-5740-2700 Email: r14525@onsemi.com ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. N. American Technical Support: 800-282-9855 Toll Free USA/Canada http://onsemi.com 8 SN74LS85/D