Overview
The MC74ACT161DG, produced by onsemi, is a high-speed synchronous modulo-16 binary counter. This component is part of the MC74ACT161 and MC74ACT163 series, which are designed for synchronous counting and loading applications. It features an asynchronous Master Reset input and is suitable for use in programmable dividers and synchronous multistage counters.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC (Supply Voltage) | 4.5 | 5.0 | 5.5 | V |
| VI (DC Input Voltage) | 0 | - | VCC + 0.5 | V |
| VO (DC Output Voltage) | 0 | - | VCC + 0.5 | V |
| fmax (Maximum Count Frequency) | 115 | 125 | - | MHz |
| tPLH (Propagation Delay CP to Qn) | 1.5 | 8.0 | 9.5 | ns |
| tPHL (Propagation Delay CP to Qn) | 1.5 | 8.0 | 10.5 | ns |
| TA (Operating Ambient Temperature Range) | -40 | 25 | 85 | °C |
| IOH (Output Current) | -24 | - | - | mA |
Key Features
- Synchronous counting and loading
- High-speed synchronous expansion
- Typical count rate of 125 MHz
- Outputs source/sink 24 mA
- TTL compatible inputs for 'ACT series
- Asynchronous Master Reset input (overrides all other inputs)
- Terminal Count output for forming synchronous multistage counters
- Five control inputs: Master Reset (MR), Parallel Enable (PE), Count Enable Parallel (CEP), Count Enable Trickle (CET), and Synchronous Reset (SR for '163 series)
Applications
- Programmable dividers
- Synchronous multistage counters
- High-speed digital circuits requiring synchronous counting and loading
- Applications where precise timing and control are necessary
Q & A
- What is the maximum count frequency of the MC74ACT161DG?
The maximum count frequency is up to 125 MHz.
- What is the operating ambient temperature range for this component?
The operating ambient temperature range is from -40°C to 85°C.
- What type of reset does the MC74ACT161DG have?
The MC74ACT161DG has an asynchronous Master Reset input.
- How many control inputs does the MC74ACT161DG have?
The component has five control inputs: Master Reset (MR), Parallel Enable (PE), Count Enable Parallel (CEP), Count Enable Trickle (CET), and Synchronous Reset is not applicable for this specific model but is available in the '163 series.
- What is the purpose of the Terminal Count output?
The Terminal Count output is used to form synchronous multistage counters.
- What is the typical propagation delay from CP to Qn?
The typical propagation delay from CP to Qn is around 8.0 ns.
- Can the MC74ACT161DG be used in high-speed digital circuits?
- What is the output current capability of the MC74ACT161DG?
The outputs can source/sink up to 24 mA.
- Is the MC74ACT161DG TTL compatible?
- What is the supply voltage range for the MC74ACT161DG?
The supply voltage range is from 4.5 V to 5.5 V.
