Overview
The SN74HC165NG4, produced by Texas Instruments, is an 8-bit parallel-load shift register. This device is designed to shift data from parallel inputs to a serial output. It features a wide operating voltage range of 2 V to 6 V, making it versatile for various applications. The SN74HC165NG4 includes eight individual direct data inputs (A-H) that are enabled by a low level at the shift/load (SH/LD) input, allowing for parallel loading of data. The device also includes a clock-inhibit (CLK INH) function and complementary serial outputs (QH and QH).
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Voltage Range | 2 | 6 | V | ||
| Output Voltage (VOH) | IOH = –20 µA, VCC = 4.5 V | 3.84 | 4.4 | V | |
| Output Voltage (VOL) | IOL = 4 mA, VCC = 4.5 V | 0.1 | 0.4 | V | |
| Input Current (II) | VI = VCC or 0, VCC = 6 V | ±1000 nA | nA | ||
| Power Consumption (ICC) | VI = VCC or 0, IO = 0, VCC = 6 V | 160 µA | µA | ||
| Propagation Delay (tpd) | CLK to QH, VCC = 4.5 V, CL = 50 pF | 15 | 30 | ns | |
| Clock Frequency (fmax) | VCC = 4.5 V, CL = 50 pF | 31 | 50 | MHz |
Key Features
- Wide Operating Voltage Range: 2 V to 6 V.
- Parallel-to-Serial Data Conversion: Loads 8 bits of parallel data and shifts them out serially.
- Complementary Outputs: Provides both QH and QH outputs.
- Direct Overriding Load (Data) Inputs: Allows parallel data to be loaded irrespective of clock signals.
- Gated Clock Inputs: Features a clock-inhibit (CLK INH) function, and CLK and CLK INH functions are interchangeable.
- Low Power Consumption: Maximum ICC of 80 µA.
- Low Input Current: Maximum of 1 µA.
- High Output Drive: ±4-mA output drive at 5 V.
Applications
The SN74HC165NG4 is suitable for various digital systems requiring parallel-to-serial data conversion. It can be used in:
- Microcontroller Interfaces: To expand the number of digital inputs by cascading multiple SN74HC165NG4 devices.
- Data Logging Systems: For converting parallel data into a serial format for easier transmission or storage.
- Embedded Systems: In applications where space is limited and serial communication is preferred.
- Industrial Control Systems: For converting sensor data from parallel to serial format for processing or transmission.
Q & A
- What is the operating voltage range of the SN74HC165NG4?
The operating voltage range is from 2 V to 6 V.
- How does the parallel loading of data work in the SN74HC165NG4?
Data is loaded in parallel through eight individual direct data inputs (A-H) when the shift/load (SH/LD) input is low.
- What is the function of the clock-inhibit (CLK INH) input?
The CLK INH input inhibits the clock function, preventing any change in the output when it is high.
- Can the SN74HC165NG4 be cascaded with other devices?
- What is the maximum propagation delay of the SN74HC165NG4?
The maximum propagation delay from CLK to QH is 30 ns at VCC = 4.5 V and CL = 50 pF.
- What is the maximum output drive current of the SN74HC165NG4?
The maximum output drive current is ±4 mA at 5 V.
- What is the power consumption of the SN74HC165NG4?
The maximum power consumption (ICC) is 160 µA at VCC = 6 V.
- Can the SN74HC165NG4 drive LSTTL loads?
- What is the input current of the SN74HC165NG4?
The maximum input current is 1 µA.
- What are the typical applications of the SN74HC165NG4?
