74LS85

74LS85 SYC | Alldatasheet

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Technical content

/C0052/C0045/C0066/C0105/C0116 /C0077/C0097/C0103/C0110/C0105/C0116/C0117/C0100/C0101 /C0067/C0111/C0109/C0112/C0097/C0114/C0097/C0116/C0111/C0114 The SN74LS85 is a 4-Bit Magnitude Camparator which compares two 4-bit words (A, B), each word having four Parallel Inputs 0 –A 3, B0 –B 3); 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” A>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: I A<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
• O A>B , OA<B , and OA=B Outputs Available GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 4.75 5.0 5.25 V TA Operating Ambient Temperature Range 0 25 70 °C IOH Output Current – High –0.4 mA IOL Output Current – Low 8.0 mA LOW POWER SCHOTTKY Device Package Shipping

ORDERING INFORMATION

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CONNECTION DIAGRAM DIP (TOP VIEW) 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 A 0 – A3, B0 – B3 IA = B IA < B, IA > B OA > B OA < B OA = 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 U.L. 5 U.L. 5 U.L. NOTES: a) 1 TTL Unit Load (U.L.) = 40 /C0109A HIGH/1.6 mA LOW. HIGH LOW (Note a)LOADING PIN NAMES VCC = PIN 16 GND = PIN 8 10 12 13 15 9 11 14 1 A

0 A1 A2 A3 B0 B1 B2 B3

IA>B IA<B IA=B OA>B OA<B OA=B NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 14 13 12 11 10 9 12345 6 7 16 15 VCC A3 B2 A2 A1 A0B1 B0 IA<B IA=B IA>B OA>B OA=B OA<B GND www.sycelectronica.com.ar

H = HIGH Level L = LOW Level X = IMMATERIAL SN74LS85 LOGIC DIAGRAM O A>B O A<B O A=B (5) (6) (7) A<B A=B A>B (15) (1) (13) (14) (12) (11) (10) (9) (2) (3) (4) TRUTH TABLE COMPARING INPUTS CASCADING INPUTS OUTPUTS A 3,B3 A 2,B2 A 1,B1 A 0,B0 IA>B IA<B IA=B O A>B O A<B O A=B A3>B3 X X X X X X H L L A3<B3 XXX X XX L HL A3=B3 A2>B2 XX X XX H LL A3=B3 A2<B2 XX X XX L HL A3=B3 A2=B2 A1>B1 XX XX H LL A3=B3 A2=B2 A1<B1 XX XX L HL A3=B3 A2=B2 A1=B1 A 0>B0 X XX H LL A3=B3 A2=B2 A1=B1 A0<B0 X XX L HL A3=B3 A2=B2 A1=B1 A0=B0 H LL H LL A3=B3 A2=B2 A1=B1 A0=B0 L HL L HL A3=B3 A2=B2 A1=B1 A0=B0 X XH L LH A3=B3 A2=B2 A1=B1 A0=B0 H HL L LL A3=B3 A2=B2 A1=B1 A0=B0 L L L H H L www.sycelectronica.com.ar

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. Figure 3. Figure 4.

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– B F C S H G D J L M 16 PL SEATING 916 K PLANE–T– MAM0.25 (0.010) T DIM MIN MAX MIN MAX MILLIMETERSINCHES A 0.740 0.770 18.80 19.55 B 0.250 0.270 6.35 6.85 C 0.145 0.175 3.69 4.44 D 0.015 0.021 0.39 0.53 F 0.040 0.70 1.02 1.77 G 0.100 BSC 2.54 BSC H 0.050 BSC 1.27 BSC J 0.008 0.015 0.21 0.38 K 0.110 0.130 2.80 3.30 L 0.295 0.305 7.50 7.74 M 0 10 0 10 S 0.020 0.040 0.51 1.01 /C0095/C0095/C0095/C0095 www.sycelectronica.com.ar

CASE 751B–05 ISSUE J 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. 16 9 SEATING PLANE F JM R X 45/C0095 G

8 PLP–B–

–A– M0.25 (0.010) B S –T– D K C 16 PL SBM0.25 (0.010) A ST DIM MIN MAX MIN MAX INCHESMILLIMETERS A 9.80 10.00 0.386 0.393 B 3.80 4.00 0.150 0.157 C 1.35 1.75 0.054 0.068 D 0.35 0.49 0.014 0.019 F 0.40 1.25 0.016 0.049 G 1.27 BSC 0.050 BSC J 0.19 0.25 0.008 0.009 K 0.10 0.25 0.004 0.009 M 0 7 0 7 P 5.80 6.20 0.229 0.244 R 0.25 0.50 0.010 0.019 /C0095/C0095/C0095/C0095 www.sycelectronica.com.ar