Overview
The SN74LV165A device, produced by Texas Instruments, is a parallel-load, 8-bit shift register designed for operation over a wide voltage range of 2 V to 5.5 V. This device is particularly useful in applications requiring serial-to-parallel data conversion and vice versa. When clocked, data is shifted toward the serial output QH, and parallel-in access to each stage is provided by eight individual direct data inputs enabled by a low level at the shift/load (SH/ LD) input. The device features a clock-inhibit function and a complemented serial output, QH, making it versatile for various digital circuit designs.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Operating Voltage (VCC) | Range of operating voltage | 2 V to 5.5 V |
| Maximum Propagation Delay (tpd) | At 5 V | 10.5 ns |
| Package Type | Type of package | TSSOP (16 pins) |
| Operating Temperature Range | Range of operating temperature | -40°C to 125°C |
| Thermal Resistance (RθJA) | Junction-to-ambient thermal resistance | 113.3 °C/W |
| Maximum Clock Frequency | At VCC = 5 V, CL = 50 pF | 95 MHz |
| Ioff (Partial Power-Down) | Supports partial-power-down mode operation | Yes |
| Latch-Up Performance | Exceeds 250 mA per JESD 17 | Yes |
Key Features
- VCC Operation Range: Operates over a wide voltage range of 2 V to 5.5 V.
- Maximum Propagation Delay: Maximum tpd of 10.5 ns at 5 V.
- Mixed-Mode Voltage Operation: Supports mixed-mode voltage operation on all ports.
- Partial Power-Down Mode: Ioff circuitry supports partial-power-down mode operation, disabling outputs when powered down.
- Latch-Up Performance: Latch-up performance exceeds 250 mA per JESD 17.
- Clock-Inhibit Function: Features a clock-inhibit function and a complemented serial output, QH.
Applications
- Microcontroller Input Expansion: Can be used to increase the number of inputs on a microcontroller by converting serial data to parallel data.
- Digital Circuit Designs: Suitable for various digital circuit designs requiring serial-to-parallel and parallel-to-serial data conversion.
- Embedded Systems: Useful in embedded systems where data needs to be shifted and processed in both serial and parallel formats.
Q & A
- What is the operating voltage range of the SN74LV165A?
The SN74LV165A operates over a voltage range of 2 V to 5.5 V.
- What is the maximum propagation delay at 5 V?
The maximum propagation delay at 5 V is 10.5 ns.
- What type of package does the SN74LV165APWR come in?
The SN74LV165APWR comes in a TSSOP (16 pins) package.
- What is the operating temperature range of the SN74LV165A?
The operating temperature range is -40°C to 125°C.
- Does the SN74LV165A support partial power-down mode?
Yes, it supports partial power-down mode using Ioff circuitry.
- What is the maximum clock frequency at VCC = 5 V and CL = 50 pF?
The maximum clock frequency is 95 MHz.
- How does the clock-inhibit function work?
The clock-inhibit function allows clocking to be accomplished by a low-to-high transition of the clock (CLK) input while SH/ LD is held high and clock inhibit (CLK INH) is held low.
- What is the purpose of the Ioff circuitry?
The Ioff circuitry disables the outputs when the supply pin is held at 0 V, preventing damaging current backflow.
- Can the SN74LV165A drive a load with a total capacitance greater than 50 pF?
While it can drive a load with a total capacitance greater than 50 pF, it is not recommended to exceed 50 pF for optimal performance.
- What are some common applications of the SN74LV165A?
Common applications include increasing the number of inputs on a microcontroller, digital circuit designs, and embedded systems requiring serial-to-parallel data conversion.
