Overview
The SN74LV165APWRG4 is a parallel-load, 8-bit shift register designed and manufactured by Texas Instruments. This device operates within a voltage range of 2 V to 5.5 V, making it versatile for various applications. It features eight individual direct data inputs, a clock-inhibit function, and a complemented serial output. The device is clocked by a low-to-high transition of the clock (CLK) input while the shift/load (SH/LD) input is held high and the clock inhibit (CLK INH) is held low. This shift register is fully specified for partial-power-down applications, utilizing Ioff circuitry to disable outputs and prevent backflow current when powered down.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| VCC Operation | 2 V to 5.5 V | V | |
| Maximum tpd at 5 V | 10.5 ns | ns | CL = 50 pF |
| Maximum Frequency at 3.3 V | 80 MHz | MHz | CL = 15 pF |
| Maximum Frequency at 5 V | 165 MHz | MHz | CL = 15 pF |
| Power Dissipation Capacitance at 3.3 V | 36.1 pF | pF | CL = 50 pF, f = 10 MHz |
| Power Dissipation Capacitance at 5 V | 37.5 pF | pF | CL = 50 pF, f = 10 MHz |
| Junction-to-Ambient Thermal Resistance (RθJA) | 48.8 °C/W | °C/W | RGY Package |
| Package Types | SOIC, SSOP, SO, TSSOP, TVSOP, VQFN, WQFN |
Key Features
- Operates over a wide VCC range of 2 V to 5.5 V
- Maximum propagation delay time (tpd) of 10.5 ns at 5 V
- Supports mixed-mode voltage operation on all ports
- Ioff circuitry for partial-power-down mode operation
- Latch-up performance exceeds 250 mA per JESD 17
- Clock-inhibit function and complemented serial output (QH)
- Eight individual direct data inputs enabled by a low level at the shift/load (SH/LD) input
Applications
The SN74LV165APWRG4 is suitable for various applications requiring serial-to-parallel data conversion and vice versa. Some common applications include:
- Increasing the number of inputs on a microcontroller by using the shift register to serialize data.
- Implementing data transmission and reception in serial communication systems.
- Building digital counters and timers.
- Creating digital display drivers and other sequential logic circuits.
Q & A
- What is the operating voltage range of the SN74LV165APWRG4?
The SN74LV165APWRG4 operates within a voltage range of 2 V to 5.5 V.
- What is the maximum propagation delay time (tpd) at 5 V?
The maximum propagation delay time (tpd) at 5 V is 10.5 ns.
- What is the function of the clock-inhibit (CLK INH) input?
The clock-inhibit (CLK INH) input allows for the inhibition of the clock signal, enabling or disabling the shift operation based on its state.
- How does the shift/load (SH/LD) input function?
The shift/load (SH/LD) input enables parallel loading when held low and inhibits parallel loading when held high.
- What is the purpose of Ioff circuitry in the SN74LV165APWRG4?
The Ioff circuitry disables the outputs to prevent backflow current when the device is powered down, supporting partial-power-down applications.
- What are the package types available for the SN74LV165APWRG4?
The device is available in SOIC, SSOP, SO, TSSOP, TVSOP, VQFN, and WQFN packages.
- What is the maximum capacitive load that the SN74LV165APWRG4 can drive?
The device can drive a load with a total capacitance less than or equal to 50 pF while meeting all data sheet specifications.
- How should unused inputs be handled in the SN74LV165APWRG4?
Unused inputs must be connected to a logic high or logic low voltage to prevent floating and ensure defined operational states.
- What is the significance of the junction-to-ambient thermal resistance (RθJA) in the SN74LV165APWRG4?
The RθJA value indicates the thermal resistance from the junction to the ambient, which is crucial for thermal management and design considerations.
- Can the SN74LV165APWRG4 be used in mixed-mode voltage applications?
Yes, the device supports mixed-mode voltage operation on all ports.
