4027 - Dual JK Flip-Flop Technical Summary

Overview

The 4027 is a dual JK flip-flop integrated circuit (IC) that provides two independent flip-flops in a single package. It is part of the 4000 series CMOS logic family, known for its low power consumption and wide operating voltage range. The 4027 features SET-RESET capability and static flip-flop operation, allowing it to retain its state indefinitely regardless of the clock level (high or low). This makes it suitable for applications requiring stable state retention and medium-speed operation.

Features

• Dual JK Flip-Flops: Contains two independent JK flip-flops in a single IC.
• Set-Reset Capability: Each flip-flop includes SET and RESET inputs for direct control over the output state.
• Static Operation: Retains state indefinitely with the clock level either high or low.
• Medium-Speed Operation: Typical clock frequency of 16MHz.
• Wide Operating Voltage Range: Operates from 3V to 15V, making it versatile for various logic level requirements.
• Low Power Consumption: CMOS technology ensures minimal power draw, especially in static conditions.
• High Noise Immunity: Robust against electrical noise, ensuring reliable operation in noisy environments.

Applications

The 4027 is widely used in digital systems where state retention and sequential logic are required. Common applications include:

• Frequency Division: Can be used to divide clock signals by 2 or higher multiples.
• Data Storage: Acts as a basic memory element in registers and storage circuits.
• Counters: Forms the building block for ripple counters and other counting circuits.
• Control Logic: Used in state machines and sequential control systems.
• Pulse Synchronization: Helps synchronize asynchronous signals to a clock domain.
• Debouncing Circuits: Eliminates switch bounce in mechanical switches.

Electrical Characteristics

The following table summarizes the key electrical characteristics of the 4027 IC under typical operating conditions (V_DD = 5V, T_A = 25°C unless otherwise specified).

Absolute Maximum Ratings

• Supply Voltage (V_DD): -0.5V to +18V
• Input Voltage (V_IN): -0.5V to V_DD + 0.5V
• Operating Temperature Range: -55°C to +125°C
• Storage Temperature Range: -65°C to +150°C

DC Electrical Characteristics

• High-Level Input Voltage (V_IH): 3.5V (min) at V_DD = 5V
• Low-Level Input Voltage (V_IL): 1.5V (max) at V_DD = 5V
• High-Level Output Voltage (V_OH): 4.95V (min) at I_OH = -0.4mA
• Low-Level Output Voltage (V_OL): 0.05V (max) at I_OL = 0.4mA
• Input Leakage Current (I_IN): ±0.1µA (max) at V_DD = 18V
• Quiescent Supply Current (I_DD): 1µA (max) at V_DD = 18V

AC Electrical Characteristics

• Maximum Clock Frequency (f_CLK): 16MHz (typ) at V_DD = 10V
• Propagation Delay (t_PD): 60ns (typ) from CLK to Q at V_DD = 10V
• Setup Time (t_SU): 20ns (min) for J or K inputs before CLK↑
• Hold Time (t_H): 0ns (min) for J or K inputs after CLK↑

Package Information

The 4027 is available in multiple package options to suit different assembly and space requirements. Below are the common package details:

16-Pin Dual In-Line Package (DIP)

• Package Type: PDIP-16
• Dimensions: 19.3mm x 6.35mm (0.76in x 0.25in)
• Pin Pitch: 2.54mm (0.1in)
• Material: Molded Plastic

16-Pin Small Outline Package (SOIC)

• Package Type: SOIC-16
• Dimensions: 9.9mm x 3.9mm (0.39in x 0.15in)
• Pin Pitch: 1.27mm (0.05in)
• Material: Molded Plastic

Pin Configuration

The pinout for the 4027 is as follows (top view):

• Pin 1: Q1 (Output of Flip-Flop 1)
• Pin 2: ~Q1 (Complementary Output of Flip-Flop 1)
• Pin 3: CLK1 (Clock Input for Flip-Flop 1)
• Pin 4: RESET1 (Reset Input for Flip-Flop 1)
• Pin 5: J1 (J Input for Flip-Flop 1)
• Pin 6: K1 (K Input for Flip-Flop 1)
• Pin 7: SET1 (Set Input for Flip-Flop 1)
• Pin 8: V_SS (Ground)
• Pin 9: SET2 (Set Input for Flip-Flop 2)
• Pin 10: K2 (K Input for Flip-Flop 2)
• Pin 11: J2 (J Input for Flip-Flop 2)
• Pin 12: RESET2 (Reset Input for Flip-Flop 2)
• Pin 13: CLK2 (Clock Input for Flip-Flop 2)
• Pin 14: ~Q2 (Complementary Output of Flip-F