HEF4518BP
Dual 4-bit BCD counter ICs in 16-pin PDIP for logic applications
Manufacturer： ['nexperia', 'nxp']
series introduction
# HEF4518BP Product Series Introduction
## 1. Overview
The HEF4518BP belongs to a well - established and widely used integrated circuit product series. It is a dual BCD (Binary - Coded Decimal) up - counter, which means it contains two independent 4 - stage synchronous BCD up - counters within a single package. This integration provides a compact and efficient solution for applications that require counting functionality, especially in digital systems where decimal counting is essential.
## 2. Key Features
### 2.1 High - Speed Operation
The HEF4518BP is designed to operate at relatively high speeds, making it suitable for applications where rapid counting is required. It can handle clock frequencies within a certain range, allowing for quick and accurate counting of input pulses. This high - speed performance enables it to be used in real - time systems where timely data processing is crucial.
### 2.2 Low Power Consumption
One of the significant advantages of this product series is its low power consumption. In today's energy - conscious world, this feature is highly desirable, especially for battery - powered devices or applications where power efficiency is a top priority. The low power design helps to extend the battery life of portable devices and reduces the overall power requirements of larger systems.
### 2.3 Wide Supply Voltage Range
The HEF4518BP can operate over a wide supply voltage range. This flexibility allows it to be used in various power supply environments, from low - voltage battery - powered circuits to higher - voltage industrial applications. The ability to work with different supply voltages makes it a versatile component that can be easily integrated into different types of systems.
### 2.4 Compatibility with TTL and CMOS Logic
It is compatible with both TTL (Transistor - Transistor Logic) and CMOS (Complementary Metal - Oxide - Semiconductor) logic levels. This compatibility simplifies the interface design when integrating the HEF4518BP with other digital components. Whether the system uses TTL - based or CMOS - based logic, the HEF4518BP can be easily connected without the need for complex level - shifting circuits.
## 3. Pin Configuration and Functionality
### 3.1 Pin Layout
The HEF4518BP comes in a standard 16 - pin DIP (Dual In - Line Package) or other surface - mount packages. Each pin has a specific function related to the operation of the two BCD up - counters.
### 3.2 Input Pins
- **Clock Inputs (CP1 and CP2)**: These pins are used to provide the clock signal for each of the two independent counters. The counters increment their count value on the rising or falling edge of the clock signal, depending on the internal design.
- **Enable Inputs (EN1 and EN2)**: The enable inputs control whether the counters are active or not. When the enable input is in the appropriate logic state, the counter will respond to the clock pulses and increment the count. When disabled, the counter holds its current count value.
- **Reset Inputs (MR1 and MR2)**: The reset inputs are used to reset the counters to their initial state (usually zero). When a reset signal is applied, the count value of the corresponding counter is immediately set to zero.
### 3.3 Output Pins
- **Q0 - Q3 Outputs**: For each counter, there are four output pins (Q0 - Q3) that represent the 4 - bit BCD count value. These outputs can be used to drive other digital components, such as displays or other logic circuits, to indicate the current count.
## 4. Applications
### 4.1 Digital Clocks and Timers
In digital clock circuits, the HEF4
Images for reference
16-DIP SOT38-1
16-Dip
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