Overview
The SN74HC165DBR is an 8-bit parallel-load shift register produced by Texas Instruments. This device is part of the SNx4HC165 family and is designed to operate within a wide voltage range of 2 V to 6 V. It features a single serial input and eight parallel load inputs, allowing for simultaneous loading of all 8 bits when the shift/load (SH/LD) input is low. The device shifts data on the rising edge of the clock (CLK) signal and includes a clock-inhibit (CLK INH) function to control the shifting process.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Voltage Range | 2 | 6 | V | ||
| Output Drive at 5 V | IOH = –4 mA | 3.7 | 5.2 | V | |
| Input Current | VI = VCC or 0 | ±1000 nA | A | ||
| Power Consumption | ICC, VI = VCC or 0, IO = 0 | 80 µA | A | ||
| Propagation Delay (tpd) | CLK to QH or QH | 13 | 26 | ns | |
| Clock Frequency | fmax at VCC = 5 V | 31 | 50 | MHz | |
| Package Type | SSOP (16 pins) | ||||
| Package Dimensions | 8.20 mm × 6.50 mm |
Key Features
- Wide Operating Voltage Range: 2 V to 6 V.
- Parallel-to-Serial Data Conversion: Loads all 8 bits simultaneously through parallel load inputs when SH/LD is low.
- Low Power Consumption: Maximum ICC of 80 µA.
- High Output Drive: ±4-mA output drive at 5 V.
- Low Input Current: Maximum input current of 1 µA.
- Clock-Inhibit Function: CLK INH inhibits the clock function, preventing output changes.
- Complementary Outputs: Provides both QH and QH outputs.
- Direct Overriding Load Inputs: Parallel inputs to the register are enabled independently of CLK, CLK INH, or serial inputs when SH/LD is low.
Applications
- Programmable Logic Controllers: Used in various control systems.
- Appliances: Integrated into consumer electronics and appliances.
- Video Display Systems: Utilized in video processing and display systems.
- Output Expanders: Expands the output capabilities of other logic circuits.
- Keyboards and Other Input Devices: Used in keyboard and other input device circuits.
Q & A
- What is the operating voltage range of the SN74HC165DBR?
The operating voltage range is 2 V to 6 V.
- How many bits can the SN74HC165DBR load in parallel?
The device can load 8 bits in parallel.
- What is the maximum power consumption of the SN74HC165DBR?
The maximum power consumption is 80 µA.
- What is the purpose of the clock-inhibit (CLK INH) function?
The CLK INH function inhibits the clock, preventing any change in the output.
- What type of package does the SN74HC165DBR come in?
The device comes in a SSOP (16-pin) package.
- What are the dimensions of the SSOP package for the SN74HC165DBR?
The dimensions are 8.20 mm × 6.50 mm.
- What is the typical propagation delay (tpd) of the SN74HC165DBR?
The typical propagation delay is 13 ns.
- What is the maximum clock frequency for the SN74HC165DBR at 5 V?
The maximum clock frequency is 50 MHz.
- Can the SN74HC165DBR drive multiple LSTTL loads?
Yes, it can drive up to 10 LSTTL loads.
- What are some common applications of the SN74HC165DBR?
Common applications include programmable logic controllers, appliances, video display systems, output expanders, and keyboards.
