onsemi MC14014BDR2G 8-Stage Static Shift Register: Datasheet, Pinout, and Application Circuits
The MC14014BDR2G from onsemi is a high-performance 8-stage static shift register belonging to the venerable 4000 series CMOS logic family. This integrated circuit is designed for serial-in, parallel-out data handling, making it a fundamental component for applications requiring data storage, conversion, or time-delay generation. Its static operation allows it to handle very low-frequency signals down to DC, a key advantage over dynamic shift registers.
This article provides a detailed overview of its datasheet specifications, pinout configuration, and practical application circuits.
Datasheet Overview and Key Specifications
The MC14014BDR2G is characterized by its wide operating voltage range (3.0 V to 18 V), which offers significant flexibility in interfacing with various logic levels and system voltages. Its low power consumption, typical of CMOS technology, makes it suitable for battery-powered devices.
Key electrical characteristics include:
High Noise Immunity: Typically 0.45 \(V_{DD}\) at 5V, ensuring reliable operation in electrically noisy environments.
Low Power TTL Compatibility: Can directly interface with low-power TTL (LPTTL) logic families.
Static Operation: The state of each register stage is maintained as long as power is applied, without the need for a minimum clock frequency.
Clock Inhibit Function: A dedicated pin allows the clock input to be disabled, pausing the shifting of data without halting the entire system.
The device is offered in a standard SOIC-16 package, identified by the "DR2G" suffix, which is suitable for automated PCB assembly.
Pinout Configuration
Understanding the pinout is crucial for circuit design. The MC14014BDR2G in a 16-pin package has the following key pins:
Pin 16 (VDD): Positive supply voltage.
Pin 8 (VSS): Ground reference.
Pin 1 (SERIAL IN): The primary data input. Data is entered serially here.
Pin 9 (CLOCK): The clock input. Data is shifted to the next stage on each low-to-high (positive) clock transition.
Pin 10 (CLOCK INHIBIT): When held HIGH, this pin disables the clock input, preventing further shifting.
Pins 3 through 7 and 11 through 15 (Q1 to Q8): The parallel output pins from each of the eight stages. Q1 is the first output after the serial input.
Application Circuits
1. Basic Serial-to-Parallel Conversion: The most straightforward application. A serial data stream is applied to the SERIAL IN pin. With each clock pulse, the data bit moves to the next stage. After eight clock pulses, the original 8-bit serial word is available simultaneously on the Q1 to Q8 outputs for reading by a microprocessor or another parallel-input device.
2. Time-Delay Generator: By utilizing the individual outputs (Q1 to Q8), the MC14014B can generate multiple, precisely timed delay signals. The delay from the clock pulse to a specific output is a function of the clock period multiplied by the number of stages. For example, the signal on Q8 is delayed by eight clock cycles from the initial input.
3. Data Buffer/Storage: The register can act as a temporary storage buffer for data. It can hold an 8-bit pattern for an indefinite period (static), which can then be clocked out serially from the last stage (Q8) or read in parallel.
ICGOODFIND Summary
The onsemi MC14014BDR2G is a versatile and robust static shift register that remains highly relevant for modern digital design. Its wide voltage range, CMOS low-power consumption, and static operation make it an excellent choice for level shifting, signal delay, and serial-to-parallel conversion tasks in industrial control, automotive, and consumer electronics. Its ability to interface easily with both modern microcontrollers and older logic families underscores its enduring utility.
Keywords:
1. Static Shift Register
2. Serial-to-Parallel Converter
3. CMOS Logic
4. Wide Voltage Range
5. Clock Inhibit
