Overview
The SN74HC165PWRG4, produced by Texas Instruments, is an 8-bit parallel-load shift register. This device is part of the HC165 series, known for its wide operating voltage range of 2 V to 6 V and low power consumption. It features a clock-inhibit function and complementary serial outputs, making it versatile for various digital applications. The SN74HC165PWRG4 is available in a TSSOP (16) package, making it suitable for space-constrained designs.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Operating Voltage Range | V | 2 | 6 | ||
| Output Drive at 5 V | IOH = –4 mA | mA | ±4 | ||
| Input Current | VI = VCC or 0 | µA | 1 | 1000 nA | |
| Propagation Delay (tpd) | CLK to QH | ns | 13 | 26 | |
| Clock Frequency | MHz | 31 | 50 | ||
| Power Dissipation Capacitance | No load | pF | 75 |
Key Features
- Wide Operating Voltage Range: 2 V to 6 V, making it suitable for a variety of applications.
- Parallel-to-Serial Data Conversion: Loads all 8 bits simultaneously through parallel load inputs when SH/LD is low.
- Clock-Inhibit Function: Inhibits the clock function, resulting in no change of the output when CLK INH is high.
- Complementary Serial Outputs: Provides both QH and QH̄ outputs.
- Low Power Consumption: Maximum current of 160 µA at 6 V.
- Direct Overriding Load (Data) Inputs: Parallel data is loaded irrespective of clock signals.
- Gated Clock Inputs: CLK and CLK INH functions are interchangeable.
Applications
- Programmable Logic Controllers (PLCs): For expanding input capabilities.
- Appliances: For various control and monitoring functions.
- Video Display Systems: For serial data transmission and display control.
- Output Expanders: For processors with limited GPIOs.
- Keyboards and Digital Inputs: For interfacing multiple digital inputs with a single processor.
Q & A
- What is the operating voltage range of the SN74HC165PWRG4?
The operating voltage range is 2 V to 6 V.
- How many bits can the SN74HC165PWRG4 load in parallel?
The device can load 8 bits in parallel.
- What is the purpose of the clock-inhibit function?
The clock-inhibit function inhibits the clock, resulting in no change of the output when CLK INH is high.
- What are the typical propagation delay times for the SN74HC165PWRG4?
The typical propagation delay times are around 13 ns for CLK to QH.
- Can the SN74HC165PWRG4 be used in high-temperature environments?
Yes, it can operate over a temperature range of –40°C to 125°C.
- How does the device handle parallel data loading?
Parallel data is loaded irrespective of clock signals when SH/LD is low.
- What is the maximum output drive at 5 V?
The maximum output drive at 5 V is ±4 mA.
- Can multiple SN74HC165PWRG4 devices be cascaded?
Yes, multiple devices can be cascaded to allow more digital inputs to be interfaced with a single processor.
- What are some common applications of the SN74HC165PWRG4?
Common applications include PLCs, appliances, video display systems, output expanders, and keyboards.
- What is the power dissipation capacitance of the SN74HC165PWRG4?
The power dissipation capacitance is typically 75 pF with no load.
