4518 - HCC4518B Dual BCD Up-Counter

Overview

The HCC4518B is a dual BCD up-counter belonging to the "B" series of high-speed CMOS devices. This IC is designed for reliable operation in digital counting applications, offering two independent BCD (Binary-Coded Decimal) counters in a single package. Manufactured using advanced silicon-gate CMOS technology, the HCC4518B ensures low power consumption while maintaining high noise immunity and wide operating voltage range. It is suitable for extended temperature range applications, making it ideal for industrial and automotive environments.

Features

• Dual BCD Up-Counters: Contains two independent BCD counters in a single IC.
• High-Speed Operation: Optimized for fast counting applications with minimal propagation delay.
• Low Power Consumption: CMOS technology ensures minimal power dissipation.
• Wide Operating Voltage Range: Supports operation from 3V to 18V, making it versatile for various logic levels.
• High Noise Immunity: Robust design minimizes susceptibility to electrical noise.
• Extended Temperature Range: Operates reliably from -40°C to +125°C, suitable for harsh environments.
• Synchronous or Asynchronous Operation: Configurable for different counting modes.
• Reset Functionality: Includes master reset pins for each counter to clear outputs.

Applications

The HCC4518B is widely used in digital systems requiring precise counting and timing functions. Key applications include:

• Frequency Dividers: Used in clock division circuits for generating lower-frequency signals.
• Digital Clocks and Timers: Integral component in timekeeping circuits.
• Industrial Control Systems: Provides counting functionality in automation and process control.
• Automotive Electronics: Suitable for dashboard counters and sensor interfaces.
• Consumer Electronics: Used in appliances, digital displays, and instrumentation.
• Communication Systems: Employed in signal processing and data transmission circuits.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_DD): -0.5V to +20V
• Input Voltage (V_IN): -0.5V to V_DD + 0.5V
• Operating Temperature Range: -40°C to +125°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_DD): 3V to 18V
• Input High Voltage (V_IH): 70% of V_DD (min)
• Input Low Voltage (V_IL): 30% of V_DD (max)
• Clock Frequency (f_CLK): Up to 8 MHz at 10V supply

DC Electrical Characteristics

• Quiescent Current (I_DD): 1 µA (max) at 5V, 25°C
• Output High Voltage (V_OH): V_DD - 0.1V (min) at I_OH = -1 mA
• Output Low Voltage (V_OL): 0.1V (max) at I_OL = 1 mA
• Input Leakage Current (I_IN): ±100 nA (max) at V_DD = 18V

AC Electrical Characteristics

• Propagation Delay (t_PD): 200 ns (typ) at V_DD = 10V, C_L = 50 pF
• Clock Pulse Width (t_W): 60 ns (min) at V_DD = 10V
• Reset Pulse Width (t_RESET): 60 ns (min) at V_DD = 10V

Package Information

The HCC4518B is available in multiple package options to accommodate different assembly and space requirements. The following packages are commonly offered:

• 16-Pin Plastic Dual In-Line Package (PDIP): Industry-standard DIP for through-hole mounting.
• 16-Pin Small Outline Package (SOP): Surface-mount package for compact PCB designs.
• 16-Pin Thin Shrink Small Outline Package (TSSOP): Ultra-thin profile for high-density applications.

Pin Configuration

The HCC4518B features a 16-pin configuration with the following pinout:

• Pin 1: Clock Input A (Counter 1)
• Pin 2: Reset Input A (Counter 1)
• Pin 3-6: BCD Outputs Q0-Q3 (Counter 1)
• Pin 7: Ground (V_SS)
• Pin 8-11: BCD Outputs Q0-Q3 (Counter 2)
• Pin 12: Reset Input B (Counter 2)
• Pin 13: Clock Input B (Counter 2)
• Pin 14: Enable Input B (Counter 2)
• Pin 15: Enable Input A (Counter 1)
• Pin 16: Supply Voltage (V_DD)

Thermal and Mechanical Specifications

• Package Dimensions (PDIP): 19.3mm x 6.35mm x 4.57mm
• Package Dimensions (SOP): 10.3mm x 5.3mm x 1.75mm
• Lead Pitch: 1.27mm (PDIP), 0.65mm (SOP)
• Moisture Sensitivity Level (MSL): MSL 1 (Unlimited floor life)

Conclusion

The HCC4518B is a versatile and reliable dual BCD up-counter, offering high performance and low power consumption for a wide range of digital applications. Its robust design, extended temperature range, and flexible package options make it an excellent choice for engineers designing systems requiring precise counting and timing functions. Whether used in industrial controls, automotive systems, or consumer electronics, the HCC4518B delivers consistent performance under varying environmental conditions.