Overview
The CD74HCT165M96E4 is an 8-bit parallel or serial-in shift register produced by Texas Instruments. This component is part of the 74HCT series, which is known for its high-speed CMOS logic. The device allows for both parallel and serial data input and provides complementary serial outputs, making it versatile for various digital circuit applications.
The shift register can operate in two modes: parallel load and serial shift. When the parallel load (SH/LD) input is LOW, data from the A to H inputs is loaded into the register asynchronously. When the SH/LD is HIGH, data enters the register serially at the SER input and shifts one place to the right with each positive-going clock transition.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| VCC Supply Voltage Range | 4.5 to 5.5 | V | |
| Operating Temperature Range | -55 to 125 | °C | |
| Maximum Clock Frequency | 27 MHz (at VCC = 4.5V) | VCC = 4.5V, CL = 50pF | |
| CLK Pulse Width | 16 to 20 ns | ns | VCC = 4.5V |
| Set-up Time (SER to CLK) | 16 to 20 ns | ns | VCC = 4.5V |
| High Level Input Voltage (VIH) | 3.15 V (at VCC = 4.5V) | V | |
| Low Level Input Voltage (VIL) | 1.35 V (at VCC = 4.5V) | V | |
| High Level Output Voltage (VOH) | 4.4 V (at IOH = -20 μA, VCC = 4.5V) | V | |
| Low Level Output Voltage (VOL) | 0.1 V (at IOL = 20 μA, VCC = 4.5V) | V | |
| Package Type | 16-SOIC (0.154", 3.90mm Width) |
Key Features
- Buffered inputs for improved signal integrity.
- Asynchronous parallel load capability.
- Complementary serial outputs (QH and Q H) available from the last stage.
- High-speed CMOS logic with low power consumption.
- Operating voltage range of 4.5V to 5.5V.
- Wide operating temperature range from -55°C to 125°C.
- Surface mount package (16-SOIC) for compact design.
Applications
The CD74HCT165M96E4 is suitable for a variety of digital circuit applications, including:
- Parallel-to-serial data conversion.
- Serial data transmission and reception.
- Shift register expansion by cascading multiple devices.
- Digital signal processing and data manipulation.
- Embedded systems and microcontroller interfaces.
Q & A
- What is the primary function of the CD74HCT165M96E4?
The primary function is to act as an 8-bit parallel or serial-in shift register, allowing for both parallel and serial data input and providing complementary serial outputs.
- What are the operating voltage and temperature ranges for this component?
The operating voltage range is 4.5V to 5.5V, and the operating temperature range is -55°C to 125°C.
- How does the parallel load feature work?
When the parallel load (SH/LD) input is LOW, data from the A to H inputs is loaded into the register asynchronously.
- What is the maximum clock frequency for this shift register?
The maximum clock frequency is 27 MHz at VCC = 4.5V and CL = 50pF.
- What type of package does the CD74HCT165M96E4 come in?
The component comes in a 16-SOIC (0.154", 3.90mm Width) surface mount package.
- Can multiple CD74HCT165M96E4 devices be cascaded?
Yes, multiple devices can be cascaded to expand the shift register by connecting the QH output to the SER input of the succeeding device.
- What are the input and output voltage levels for this component?
The high level input voltage (VIH) is 3.15V, and the low level input voltage (VIL) is 1.35V at VCC = 4.5V. The high level output voltage (VOH) is 4.4V, and the low level output voltage (VOL) is 0.1V at the specified conditions.
- What is the significance of the complementary serial outputs?
The complementary serial outputs (QH and Q H) provide both true and inverted versions of the serial data, which can be useful in various digital circuit designs.
- How does the clock pulse width affect the operation of the shift register?
The clock pulse width must be within the specified range (16 to 20 ns at VCC = 4.5V) to ensure proper shifting of data.
- What are some common applications for this shift register?
Common applications include parallel-to-serial data conversion, serial data transmission and reception, shift register expansion, digital signal processing, and microcontroller interfaces.
