Overview
The MC74AC161DR2G is a high-speed synchronous presettable binary counter produced by onsemi. It is part of the MC74AC161 and MC74ACT161 series, which are designed for applications requiring synchronous counting and loading. This component is particularly useful in programmable dividers and forming synchronous multistage counters. It features an asynchronous Master Reset input and two types of Count Enable inputs, along with a Terminal Count output for added versatility.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| DC Supply Voltage (VCC) | 2.0 | 5.0 | 6.0 | V |
| DC Input Voltage (VI) | -0.5 | - | VCC + 0.5 | V |
| DC Output Voltage (VO) | -0.5 | - | VCC + 0.5 | V |
| Maximum Count Frequency (fmax) at VCC = 5.0V | 110 | 125 | 167 | MHz |
| Propagation Delay (tPLH) CP to Qn at VCC = 5.0V | 1.5 | - | 9.5 | ns |
| Operating Ambient Temperature Range (TA) | -40 | - | 85 | °C |
| Input Capacitance (CIN) at VCC = 5.0V | - | 4.5 | - | pF |
Key Features
- Synchronous counting and loading
- High-speed synchronous expansion
- Typical count rate of 125 MHz
- Outputs source/sink 24 mA
- Asynchronous Master Reset input (for MC74AC161)
- Synchronous Reset input (for MC74AC163)
- Two types of Count Enable inputs and Terminal Count output
- TTL compatible inputs for ′ACT series
Applications
The MC74AC161DR2G is suitable for various applications, including:
- Programmable dividers
- Synchronous multistage counters
- Digital circuits requiring high-speed counting and loading
- Industrial, automotive, and consumer electronics where precise timing and counting are essential
Q & A
- What is the maximum count frequency of the MC74AC161DR2G?
The maximum count frequency is up to 167 MHz at VCC = 5.0V. - What is the propagation delay from CP to Qn?
The propagation delay from CP to Qn is typically 1.5 ns to 9.5 ns at VCC = 5.0V. - What is the operating temperature range of the MC74AC161DR2G?
The operating ambient temperature range is -40°C to 85°C. - Does the MC74AC161DR2G have TTL compatible inputs?
Yes, the ′ACT series has TTL compatible inputs. - What is the purpose of the Terminal Count output?
The Terminal Count output indicates when the counter reaches its terminal count, which is useful for forming synchronous multistage counters. - How does the asynchronous Master Reset input function?
The asynchronous Master Reset input overrides all other inputs and forces the outputs LOW. - What is the typical current sourcing/sinking capability of the outputs?
The outputs can source/sink 24 mA. - What are the setup and hold times for the Pn inputs to CP?
The setup time is typically 6.0 ns to 11.5 ns, and the hold time is typically -7.0 ns to -0.5 ns at VCC = 5.0V. - What package type is the MC74AC161DR2G available in?
The MC74AC161DR2G is available in a SOIC-16 package. - What are some common applications of the MC74AC161DR2G?
Common applications include programmable dividers, synchronous multistage counters, and digital circuits requiring high-speed counting and loading.
