onsemi MC14011BDG Quad 2-Input NAND Gate: Datasheet, Application Circuit, and Pinout Configuration
The MC14011BDG from onsemi is a member of the venerable 4000-series CMOS logic family, renowned for its robust performance, wide supply voltage range, and low power consumption. This integrated circuit is a quadruple 2-input NAND gate, meaning a single package contains four independent NAND gates, each following the fundamental Boolean logic function where the output is LOW only if all inputs are HIGH.
Pinout Configuration
The MC14011BDG is packaged in a 14-pin SOIC (DG suffix) format. Its pinout is standardized and follows a logical arrangement:
Pins 1, 2, 13: Gate 1 inputs (A, B) and output (J).
Pins 3, 4, 5: Gate 2 inputs (A, B) and output (K).
Pins 6, 7, 8: Gate 3 inputs (A, B) and output (L).
Pins 9, 10, 11: Gate 4 inputs (A, B) and output (M).
Pin 14 (VDD): This is the positive supply voltage pin. The device operates across a wide voltage range, typically from 3V to 18V.
Pin 7 (GND): This is the ground reference pin (0V), common to all four gates.
Datasheet Key Specifications
The MC14011BDG datasheet provides critical absolute maximum ratings and electrical characteristics that define its operational boundaries.
Supply Voltage Range (VDD): The wide operating range of 3.0V to 18V allows for compatibility with various power sources, from 5V TTL levels to higher voltage systems.
High Noise Immunity: A characteristic feature of CMOS technology, it offers high noise immunity of approximately 45% of VDD at 5V, making it resilient in electrically noisy environments.
Low Power Consumption: It features very low quiescent power consumption, typically in the nanoampere range, which is ideal for battery-powered and low-energy applications.
Output Drive Capability: The device can sink and source current sufficient to drive two low-power TTL loads, one low-power Schottky TTL load, or several other CMOS inputs over the entire voltage range.
Application Circuit: A Simple Set-Reset (SR) Latch
One of the most common uses for a NAND gate like the MC14011 is constructing basic memory elements. An SR Latch is a fundamental circuit that can store a single bit of data.
Circuit Design: The latch requires only two of the four available gates. The output of the first NAND gate (Q) is connected to one input of the second gate, and the output of the second gate (Q̅) is fed back to one input of the first gate.
How It Works: The two remaining inputs serve as the Set (S) and Reset (R) signals (active LOW).
Setting S LOW and R HIGH forces output Q to a HIGH state (set).
Setting R LOW and S HIGH forces output Q to a LOW state (reset).
Holding both S and R HIGH maintains the last output state (memory/hold).
The condition where both S and R are LOW is considered invalid or forbidden, as it forces both Q and Q̅ to be HIGH, which is not a complementary state.
Function: This simple circuit demonstrates how combinatorial logic gates can be configured to create sequential logic, providing a basic building block for more complex memory and control systems.
ICGOODFIND Summary
The onsemi MC14011BDG stands as a versatile and enduring component in digital design. Its quadruple gate design offers excellent integration, reducing board space and component count. Key advantages include its exceptionally wide operating voltage range, which provides immense flexibility, and its very low static power consumption, making it a prime choice for portable and power-sensitive applications. While not suited for high-speed microprocessor interfaces, its high noise immunity ensures reliable operation in industrial and consumer environments. For engineers and hobbyists alike, the MC14011BDG remains a fundamental and reliable part for implementing basic logic functions, oscillators, latches, and waveform shaping circuits.
Keywords: CMOS Logic, NAND Gate, Wide Voltage Range, Low Power Consumption, SR Latch
