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Name: SN74HC165PWT
Brand: Texas Instruments
SKU: SN74HC165PWT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Texas Instruments SN74HC165PWT

Part No.:: SN74HC165PWT

Manufacturer:: Texas Instruments

Package:: 16-TSSOP (0.173, 4.40mm Width)

Datasheet:: SN74HC165PWT.pdf

Description:: IC SHIFT REGISTER 8BIT 16-TSSOP

In Stock:: 527

Quantity:: Add To Cart

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SN74HC165PWT Typical application Circuitry

SN74HC165PWT

The SN74HC165PWT is an 8-bit shift register, specifically designed for parallel-to-serial data conversion. This chip captures data from multiple input lines and shifts it out serially, making it highly suitable for situations where input/output pin conservation is crucial.

Core Functionality

The SN74HC165PWT excels in capturing data from eight input lines (parallel) and shifting it out through a single line (serial). This functionality is especially valuable in microcontroller-based systems where the number of GPIOs (General Purpose Input/Output) is limited, as it allows for the consolidation of multiple input signals into a single data stream.

Application Scenarios

The SN74HC165PWT is typically utilized in systems requiring data consolidation from multiple sources. Common applications include keyboard scanning, multiple sensor data aggregation, and expanding the input capability of microcontrollers or other digital systems.

Characteristic Parameters

- Supply Voltage (Vcc): Generally operates between 2V and 6V.

- Input High Voltage (VIH): Usually above 2V for a logical '1'.

- Input Low Voltage (VIL): Typically below 0.8V for a logical '0'.

- Output Current (IO): Capable of sourcing or sinking up to 6 mA.

- Propagation Delay (tPHL/tPLH): Depends on Vcc and the characteristics of the connected load.

Circuit Integration: Microcontroller Input Expansion

In this scenario, the SN74HC165PWT is employed to expand the input capabilities of a microcontroller, enabling it to process data from multiple sources via fewer GPIO pins.

1. Stable Power Supply Connection

- Vcc (Pin 16): Connect this pin to a regulated +5V power source.

- Ground (Pin 8): This pin should be connected to the system ground for a stable reference.

2. Parallel Input Configuration

- Parallel Data Inputs (A-H, Pins 10-15, 1-3): Connect these pins to the data sources you want to consolidate. These could be from switches, sensors, or other digital signals.

3. Serial Data Output Setup

- Serial Data Output (QH, Pin 9): Connect this pin to the microcontroller's input pin designated for receiving serial data.

4. Clock Signal Management

- Shift/Register Clock Input (CLK, Pin 2): Interface this pin with a clock signal from the microcontroller. The data shifts based on the rising edge of this clock.

5. Control Pin Handling

- Shift/Load Control (SH/LD, Pin 1): Wire this to a microcontroller pin. A low signal on this pin will load the data from parallel inputs into the shift register.

- Clock Inhibit (CLK INH, Pin 15): Normally connected to a logic low level unless used to control the clock operation.

6. Master Reset Functionality

- Master Reset (MR, Pin 9): Link this pin to a control line for resetting the shift register. A low signal will clear the register.

Design Considerations

Incorporating the SN74HC165PWT into a circuit requires careful attention to several critical factors:

1. Power Supply Stability: A noise-free, stable power supply is vital to avoid data corruption and ensure reliable operation.

2. Clock Signal Clarity: The clock signal should be devoid of noise and have precise edges to guarantee accurate data shifting.

3. Input Signal Integrity: Ensure that input signals are clean and stable, as noise can lead to incorrect data capture.

4. Control Signal Coordination: Manage the timing and state of SH/LD and CLK signals meticulously to ensure proper data capture and shifting.

In conclusion, the SN74HC165PWT is an essential component in digital systems where efficient input expansion and data consolidation are required. Its implementation in a microcontroller-based system for input expansion underscores its ability to manage multiple inputs effectively while conserving valuable GPIO resources. Focusing on power supply quality, clock signal integrity, input signal clarity, and control signal coordination is imperative for leveraging the full potential of the SN74HC165PWT, solidifying its role as a versatile and reliable element in digital circuit design. Whether for input expansion, data aggregation, or signal processing, the SN74HC165PWT offers a practical and flexible solution.

SN74HC165PWT information

SN74HC165PWT Specifications

Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®
Series:
74HC
ProductStatus:
Active
LogicType:
Shift Register
OutputType:
Complementary
NumberofElements:
1
NumberofBitsperElement:
8
Function:
Parallel or Serial to Serial
Voltage-Supply:
2V ~ 6V
OperatingTemperature:
-40°C ~ 125°C
MountingType:
Surface Mount

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(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

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