Overview
The 74HC161D/AUJ is a synchronous presettable 4-bit binary counter produced by NXP USA Inc. This integrated circuit features an internal look-ahead carry, enabling synchronous operation by clocking all flip-flops simultaneously on the positive-going edge of the clock (CP). The counter allows for presetting the outputs (Q0 to Q3) to either HIGH or LOW, and it includes an asynchronous clear function via the master reset input (MR). This component is part of the 74HC family, known for its high-speed CMOS logic.
Key Specifications
| Parameter | Value |
|---|---|
| Type Number | 74HC161D/AUJ |
| VCC (V) | 2.0 - 6.0 |
| Output Drive Capability (mA) | ± 5.2 |
| Logic Switching Levels | CMOS |
| tpd (ns) | 19 |
| Power Dissipation Considerations | Low |
| Tamb (°C) | -40 to +125 |
| Package | SO16 (SOT109-1) |
Key Features
- Synchronous presettable 4-bit binary counter with internal look-ahead carry.
- Synchronous operation on the positive-going edge of the clock (CP).
- Presetting capability for outputs (Q0 to Q3) to HIGH or LOW.
- Asynchronous clear function via the master reset input (MR).
- Count enable inputs (CEP and CET) must be HIGH to count.
- Terminal count output (TC) enabled by CET input.
- CMOS logic for high-speed operation.
Applications
The 74HC161D/AUJ is versatile and can be used in various applications across different industries, including:
- Automotive systems for timing and counting functions.
- Industrial control systems for sequencing and counting operations.
- Consumer electronics for timing and control circuits.
- Computing and data processing for clocking and counting in digital circuits.
- Mobile and wearable devices for efficient and compact timing solutions.
Q & A
- What is the 74HC161D/AUJ?
The 74HC161D/AUJ is a synchronous presettable 4-bit binary counter with an internal look-ahead carry. - What is the operating voltage range of the 74HC161D/AUJ?
The operating voltage range is 2.0 to 6.0 volts. - What is the output drive capability of the 74HC161D/AUJ?
The output drive capability is ± 5.2 mA. - What is the logic switching level of the 74HC161D/AUJ?
The logic switching level is CMOS. - What is the propagation delay time (tpd) of the 74HC161D/AUJ?
The propagation delay time is 19 ns. - How does the preset function work on the 74HC161D/AUJ?
The preset function allows the outputs (Q0 to Q3) to be set HIGH or LOW by disabling the counting action with a LOW at the parallel enable input (PE) and loading the data on the positive-going edge of the clock. - What is the purpose of the master reset input (MR)?
The master reset input (MR) sets all outputs (Q0 to Q3) to LOW regardless of other input levels, providing an asynchronous clear function. - Can the 74HC161D/AUJ be cascaded?
Yes, the internal look-ahead carry simplifies serial cascading of the counters. - What are the typical applications of the 74HC161D/AUJ?
It is used in automotive, industrial, consumer electronics, computing, and mobile devices for timing and counting functions. - What is the temperature range for the 74HC161D/AUJ?
The operating temperature range is -40 to +125 °C.
