Technical Summary for 4020B / 4024B / 4040B CMOS Ripple-Carry Binary Counter

Technical Summary: HCC4020B / HCC4024B / HCC4040B CMOS Ripple-Carry Binary Counters

Overview

The HCC4020B, HCC4024B, and HCC4040B are medium-speed CMOS ripple-carry binary counters from the extended temperature range HCC4XXXB family. These devices feature fully static operation, buffered inputs/outputs, and standardized symmetrical output characteristics. Designed for 5V, 10V, and 15V operation, these counters are ideal for timing and frequency division applications in industrial, automotive, and consumer electronics.

The series includes three variants with different counting stages: the HCC4020B (14-stage), HCC4024B (7-stage), and HCC4040B (12-stage). All devices share common characteristics including low power consumption, high noise immunity, and compliance with JEDEC standards for B-series CMOS devices.

Key Features

Medium-Speed Operation: Balanced performance for timing applications
Fully Static Operation: No minimum clock frequency requirement
Common Reset: Synchronous reset functionality across all stages
Buffered Inputs/Outputs: Improved signal integrity and fan-out capability
Low Power Consumption: Quiescent current specified up to 20V
Wide Voltage Range: 3V to 18V supply voltage operation
High Noise Immunity: 0.45 VDD (typical) noise margin
Extended Temperature Range: -40°C to +125°C operation (HCC version)
Standardized Outputs: Symmetrical output characteristics
JEDEC Compliant: Meets all requirements of JEDEC Tentative Standard No. 13A

Applications

These versatile counters find use in numerous digital and timing applications including:

Frequency dividers and counters
Timing circuits and delay generators
Clock division networks
Digital watches and timers
Industrial control systems
Automotive electronics
Consumer electronics
Battery-powered devices
Instrumentation and measurement equipment
Sequential logic systems

Electrical Characteristics

Absolute Maximum Ratings

Supply Voltage (VDD): -0.5V to +20V
Input Voltage (VIN): -0.5V to VDD + 0.5V
Storage Temperature Range: -65°C to +150°C
Power Dissipation: 200 mW

DC Characteristics (TA = 25°C)

High-Level Input Voltage: 0.7 VDD (min)
Low-Level Input Voltage: 0.3 VDD (max)
High-Level Output Voltage: VDD - 0.01V (min @ IOH = -0.4mA)
Low-Level Output Voltage: 0.01V (max @ IOL = 0.4mA)
Input Current: 100nA (max @ VIN = 18V)
Quiescent Current: 1μA (max @ VDD = 20V)

AC Characteristics (VDD = 10V, TA = 25°C)

Maximum Clock Frequency: 8 MHz (typ)
Propagation Delay (Clock to Output): 200 ns (typ)
Reset Pulse Width: 300 ns (min)
Input Capacitance: 5 pF (typ)

Functional Description

The HCC4020B, HCC4024B, and HCC4040B are asynchronous ripple-carry binary counters with different numbers of stages. Each device consists of master-slave flip-flops with the clock input buffered to improve noise immunity. The counters advance on the negative-going transition of the clock signal.

All counters feature a common reset input that, when brought high, clears all counter stages to zero. The reset function is synchronous with the clock, ensuring clean transitions. The buffered outputs provide improved drive capability compared to unbuffered designs.

Counter Variants

HCC4020B: 14-stage binary counter (1/16,384 division)
HCC4024B: 7-stage binary counter (1/128 division)
HCC4040B: 12-stage binary counter (1/4096 division)

Package Information

The devices are available in multiple package options to suit different application requirements:

Standard Package Options

16-pin DIP (Dual In-line Package):
- Body width: 7.62 mm
- Pin spacing: 2.54 mm
- Operating temperature: -40°C to +125°C
16-pin SOIC (Small Outline IC):
- Body width: 3.9 mm
- Pin spacing: 1.27 mm
- Lower profile for space-constrained applications
16-pin TSSOP (Thin Shrink Small Outline Package):
- Body width: 4.4 mm
- Pin spacing: 0.65 mm
- Ultra-compact footprint