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GE 7486D71G1

Product Name:​ 7486 Quad 2-Input Exclusive-OR (XOR) Gate IC (TTL Logic)
Product Introduction:​ The 7486D71G1 is a GE (RCA logic product line) standard TTL logic integrated circuit, belonging to the 7400 series. It contains four independent 2-input Exclusive-OR (XOR) gates in a single DIP-14 package, widely used in digital circuits for logic operations, parity checking, adder circuits, and signal modulation/demodulation.
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Detailed content

Technical Specifications:
  • Logic Function:​ 4 independent 2-input XOR gates
  • Package:​ DIP-14 (Dual In-line Package, 14-pin)
  • Supply Voltage (Vcc):​ 4.75V to 5.25V DC (5V typical)
  • Input High Voltage (VIH):​ ≥ 2.0V
  • Input Low Voltage (VIL):​ ≤ 0.8V
  • Output High Voltage (VOH):​ ≥ 2.4V (IOH = -0.4 mA)
  • Output Low Voltage (VOL):​ ≤ 0.4V (IOL = 16 mA)
  • Propagation Delay:​ ≤ 22 ns (typ., 25°C)
  • Operating Temperature Range:​ 0°C to +70°C (commercial grade)
  • Pinout:
    • Pin 1: A1 (Gate 1 input A)
    • Pin 2: B1 (Gate 1 input B)
    • Pin 3: Y1 (Gate 1 output)
    • Pin 4: A2, Pin 5: B2, Pin 6: Y2
    • Pin 7: GND
    • Pin 8: Y3, Pin 9: A3, Pin 10: B3
    • Pin 11: Y4, Pin 12: B4, Pin 13: A4
    • Pin 14: VCC
Key Features:
  • 4 completely independent XOR gates
  • TTL-compatible outputs
  • Directly drives subsequent TTL logic circuits
  • Low power consumption (~10 mW/gate static)
  • Input clamp diodes prevent negative voltage damage
Working Principle:​ Each XOR gate is internally composed of multi-emitter transistors and a totem-pole output stage. When the two input levels are the same (both high or both low), the output is low; when the two inputs differ, the output is high. This logic characteristic makes it widely used in half-adder binary addition and parity check circuits.
Application Scenarios:​ Logic operations, parity generation/checking, binary adder circuits (half-adders and full-adders), data comparison, controlled inverters, digital signal processing, and error detection systems.
Usage Notes:​ Maintain supply voltage within 4.75V–5.25V. Avoid exceeding maximum rated input/output currents. Input clamp diodes protect against negative voltage but proper decoupling is recommended in high-noise environments.

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