7485 4-bit Magnitude Comparator PDIP-16

7485 4-bit Magnitude Comparator PDIP-16 The 7485 4-Bit Magnitude Comparator is a high-performance CMOS digital logic IC that compares two 4-bit binary words and outputs signals indicating whether one word is greater than, less than, or equal to the other. Packaged in a standard 16-pin PDIP, this comparator supports expandability for wider word lengths through cascade inputs and outputs, making it suitable for complex digital systems and microprocessor interfaces. It is widely used in arithmetic units, sorting logic, state machines, and decision-making circuits where high-speed, reliable binary magnitude comparison is required. The robust CMOS design ensures low power consumption and high noise immunity, compatible with standard TTL and CMOS logic voltage levels. Features Compares two 4-bit binary numbers (A and B) and produces magnitude outputs. Outputs for A > B, A < B, and A = B for clear decision logic. Cascade inputs for expandability to larger bit-width comparisons. Standard PDIP-16 through-hole package for easy PCB integration. CMOS logic with low power consumption and high noise immunity. Suitable for TTL and CMOS mixed logic systems. PINOUT Pin No Pin Name Description 1 B3 Data Input B3 2 1A<B Cascading Output Pin if A<B 3 1A=B Cascading Output Pin if A=B 4 1A>B Cascading Output Pin if A>B 5 0A>B Output Pin if A>B 6 0A=B Output Pin if A=B 7 0A<B Output Pin if A<B 8 GND Ground 9 B0 Data Input B0 10 A0 Data Input A0 11 B1 Data Input B1 12 A1 Data Input A1 13 A2 Data Input A2 14 B2 Data Input B2 15 A3 Data Input A3 16 VCC Positive Supply Specifications Attribute Value Product Category: Logic Comparators Comparator Type: Magnitude Number of Bits: 4 bit Logic Function: A < B, A = B, A > B Output Type: Active High Package/Case: PDIP-16 Propagation Delay Time: 24 ns, 27 ns Supply Voltage – Min: 4.75 V Supply Voltage – Max: 5.25 V Supply Current – Max: 20 mA Minimum Operating Temperature: 0 C Maximum Operating Temperature: + 70 C Mounting Style: Through Hole High Level Output Current: – 400 uA Low Level Output Current: 8 mA Operating Supply Voltage: 4.75 V to 5.25 V For more electrical and mechanical dimensions check the datasheet How 7485 Comparator Works? The make the IC workable we will need to connect the IC first with the power supply and further with a TTL device or microcontroller to use it. In other ICs like an adder, the IC starts working from LSB but in the comparator, the IC will start comparing from the MSB. The data will start comparing from MSB and it will go to the LSB. In this case, at any point, if data A is bigger than the data B or vice versa then the output will be decided. In IC the input data will be of two parts with 4-bit each and output data will be of 3 bits. In input, the data can be any binary numbers but in output data, only one bit will be HIGH other will be LOW and all three bits will describe the output on the base of input. Here’s the circuit of IC as a 4-bit comparator. The IC can be used to compare the data of more than 4 bits by using the input expander pins. In IC those pins are Pin 2,3 and 5. Truth Table Applications Digital systems requiring binary magnitude comparison. Arithmetic and logic units in microprocessor systems. Address decoding and sorting logic circuits. Digital decision and control logic applications. Embedded systems and logic expansion modules. Package Contents 1x 7485 4-Bit Magnitude Comparator PDIP-16. Documents Datasheet 7485

IC 7485 – 4-Bit Magnitude Comparator (74HC85 / 74LS85, DIP-16) Introduction The IC 7485 is a 4-bit magnitude comparator that outputs logic signals indicating whether input word A is greater than, equal to, or less than input word B. It belongs to the 74HC/74LS logic family and is commonly used in arithmetic logic units (ALUs), digital sorting, and threshold detection systems. Both 74HC85 (CMOS) and 74LS85 (TTL) versions are available, providing compatibility for different design requirements. Key Features 4-bit binary comparator with outputs: A>B, A=B, A<B. Cascade inputs and outputs for multi-stage comparison (8, 12, 16 bits). Available in 74HC85 (CMOS, wide voltage range) and 74LS85 (TTL, standard 5V). DIP-16 package, suitable for breadboard and prototyping. Fast propagation delay and reliable logic operation. Technical Specifications Parameter 74HC85 74LS85 Supply Voltage (Vcc) 2V – 6V 4.75V – 5.25V Logic Family CMOS HC TTL LS Package DIP-16 DIP-16 Propagation Delay ~20 ns ~30 ns Outputs QA>B, QA=B, QA<B QA>B, QA=B, QA<B Cascade Inputs IA>B, IA=B, IA<B IA>B, IA=B, IA<B Operating Temp. –40 °C to +85 °C 0 °C to +70 °C Pinout & Wiring Inputs: A0–A3, B0–B3. Cascade inputs: IA>B, IA=B, IA<B. Outputs: QA>B, QA=B, QA<B. GND, VCC power pins. ( Verify package markings for correct pin assignment. ) Applications Arithmetic logic units (ALU). Digital comparators in sorting/threshold systems. Priority encoders. Multi-bit data comparison using cascaded stages. Control and automation circuits. Design Notes For least significant stage: set IA<B = LOW, IA>B = LOW, IA=B = HIGH. Cascade outputs to inputs of next stage for wider word comparison. Keep cascade nets short for reliable timing. Decouple each IC with 0.1µF capacitor near VCC. آي سي 7485 – مقارن 4-بت (74HC85 / 74LS85، DIP-16) المقدمة يُعتبر IC 7485 دائرة منطقية لمقارنة كلمتين ثنائيتين (A وB) بطول 4-بت، ويُخرج إشارات تحدد إذا كانت A أكبر من B، أو مساوية لها، أو أصغر منها. ينتمي إلى عائلة 74HC/74LS ويُستخدم بكثرة في وحدات العمليات الحسابية (ALUs)، أنظمة الفرز الرقمي، ودارات كشف العتبة. يتوفر بإصدار 74HC85 (CMOS) أو 74LS85 (TTL) لتلبية متطلبات تصميم مختلفة. الميزات الرئيسية مقارن ثنائي 4-بت مع مخارج: A>B، A=B، A<B. مداخل ومخارج للتسلسل لمقارنة كلمات أطول (8 أو 12 أو 16 بت). متوفر بإصدار 74HC85 (CMOS بجهد تشغيل واسع) و74LS85 (TTL بجهد 5 فولت قياسي). عبوة DIP-16 مناسبة للتجارب والـ Breadboard. زمن تأخير قصير وأداء منطقي موثوق. المواصفات الفنية الباراميتر 74HC85 74LS85 جهد التشغيل (Vcc) 2 – 6 فولت 4.75 – 5.25 فولت العائلة CMOS HC TTL LS الحزمة DIP-16 DIP-16 زمن التأخير ~20ns ~30ns المخرجات QA>B، QA=B، QA<B QA>B، QA=B، QA<B مداخل التسلسل IA>B، IA=B، IA<B IA>B، IA=B، IA<B مدى الحرارة –40 °م حتى +85 °م 0 °م حتى +70 °م Pinout & Wiring المداخل: A0–A3، B0–B3. مداخل التسلسل: IA>B، IA=B، IA<B. المخرجات: QA>B، QA=B، QA<B. تغذية: VCC، GND. ( يُرجى التأكد من بيانات الحزمة للتوصيل الصحيح. ) التطبيقات وحدات العمليات الحسابية (ALU). المقارنات الرقمية في أنظمة الفرز/العتبة. ترميز الأولوية (Priority Encoder). مقارنة بيانات متعددة البت عبر التسلسل. دوائر التحكم والأتمتة. ملاحظات التصميم في المرحلة الأقل أهمية (LSB): ضع IA<B = LOW، IA>B = LOW، IA=B = HIGH. اربط مخرجات المقارن بالمدخلات في المرحلة التالية لمقارنة كلمات أطول. حافظ على أسلاك التسلسل قصيرة لضمان التوقيت. أضف مكثف 0.1µF بجوار VCC لكل IC.