Overview
The CD74HCT161M is a high-speed CMOS logic 4-bit binary counter with asynchronous reset, produced by Texas Instruments (originally from Harris Semiconductor). This component is part of the 74HCT series, known for its compatibility with TTL (Transistor-Transistor Logic) inputs and its operation within a specific voltage range. The CD74HCT161M is packaged in a 16-pin SOIC (D) package and operates over a wide temperature range of -55°C to 125°C.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 16 | - |
| Operating Temperature Range | -55 to 125 | °C |
| Supply Voltage (VCC) | 4.5 to 5.5 | V |
| Maximum CP Frequency | 30 MHz (at VCC = 5V) | MHz |
| CP Width (Low) | 16 ns (at VCC = 5V) | ns |
| MR Pulse Width | 20 ns (at VCC = 5V) | ns |
| Setup Time, Pn to CP | 10 ns (at VCC = 5V) | ns |
| Propagation Delay CP to TC | 42 ns (at VCC = 5V, CL = 50pF) | ns |
| Output Transition Time | 15 ns (at VCC = 5V, CL = 50pF) | ns |
| Input Capacitance | 10 pF | pF |
| Power Dissipation Capacitance | 60 pF | pF |
Key Features
- 4-Bit Binary Counter with Asynchronous Reset
- Synchronous Counting and Loading
- Two Count Enable Inputs for n-Bit Cascading
- Look-Ahead Carry for High-Speed Counting
- Fanout: Standard Outputs - 10 LSTTL Loads, Bus Driver Outputs - 15 LSTTL Loads
- Wide Operating Temperature Range: -55°C to 125°C
- Balanced Propagation Delay and Transition Times
- Significant Power Reduction Compared to LSTTL Logic ICs
- Direct LSTTL Input Logic Compatibility
- CMOS Input Compatibility
- High Noise Immunity
Applications
The CD74HCT161M is suitable for various high-speed counting applications, including:
- Digital Counters and Timers
- Sequential Logic Circuits
- Frequency Dividers
- Event Counters
- Automated Control Systems
Q & A
- What is the operating temperature range of the CD74HCT161M?
The operating temperature range is -55°C to 125°C.
- What is the maximum clock frequency for the CD74HCT161M?
The maximum clock frequency is 30 MHz at VCC = 5V.
- What type of reset does the CD74HCT161M have?
The CD74HCT161M has an asynchronous reset.
- How many count enable inputs does the CD74HCT161M have?
The CD74HCT161M has two count enable inputs (PE and TE) for n-bit cascading.
- What is the fanout capability of the CD74HCT161M?
The fanout capability is 10 LSTTL loads for standard outputs and 15 LSTTL loads for bus driver outputs.
- Is the CD74HCT161M compatible with TTL inputs?
Yes, the CD74HCT161M is compatible with TTL inputs.
- What is the power dissipation capacitance of the CD74HCT161M?
The power dissipation capacitance is 60 pF.
- How does the look-ahead carry feature benefit the CD74HCT161M?
The look-ahead carry feature simplifies serial cascading of the counters by enabling the next cascaded stage efficiently.
- What is the input capacitance of the CD74HCT161M?
The input capacitance is 10 pF.
- Is the CD74HCT161M suitable for high-speed applications?
Yes, the CD74HCT161M is designed for high-speed counting applications.
