Overview
The SN74HC86PWR, produced by Texas Instruments, is a quadruple 2-input XOR gate integrated circuit. This device is part of the 74HC series, known for its high-speed CMOS logic. Each gate within the SN74HC86 performs the Boolean function Y = A ⊕ B in positive logic, making it versatile for various digital logic applications.
The SN74HC86 is available in several package options, including the TSSOP (Thin Shrink Small Outline Package) which is denoted by the 'PWR' suffix. This package is compact and suitable for space-constrained designs.
Key Specifications
| Parameter | Condition | Min | Max | Unit | |
|---|---|---|---|---|---|
| VCC Supply Voltage | -0.5 | 7 | V | ||
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | ||
| Input Clamp Current (IIK) | VI < 0 V or VI > VCC | ±20 | mA | ||
| Output Clamp Current (IOK) | VO < 0 V or VO > VCC | ±20 | mA | ||
| Continuous Output Current (IO) | VO = 0 to VCC | ±25 | mA | ||
| Propagation Delay (tpd) | A or B to Y, VCC = 2 V | 40 | 100 | 125 | ns |
| Propagation Delay (tpd) | A or B to Y, VCC = 4.5 V | 12 | 20 | 25 | ns |
| Propagation Delay (tpd) | A or B to Y, VCC = 6 V | 10 | 17 | 21 | ns |
| Transition Time (tt) | VCC = 2 V | 28 | 75 | 95 | ns |
| Transition Time (tt) | VCC = 4.5 V | 8 | 15 | 19 | ns |
| Transition Time (tt) | VCC = 6 V | 6 | 13 | 16 | ns |
Key Features
- Buffered Inputs: The device has buffered inputs which help in reducing the load on the input signals.
- Wide Operating Voltage Range: It operates over a wide voltage range from 2 V to 6 V.
- Wide Operating Temperature Range: The device can operate in temperatures ranging from -40°C to +85°C.
- High Fanout Capability: Supports fanout up to 10 LSTTL loads.
- Low Power Consumption: Significant power reduction compared to LSTTL logic ICs.
- CMOS Inputs and Outputs: Standard CMOS inputs and balanced CMOS push-pull outputs.
- Clamp Diode Structure: Inputs and outputs have both positive and negative clamping diodes.
Applications
- Phase Difference Detection: Can be used to detect phase differences in input signals, making it useful in clock synchronization and phase detection circuits.
- Selectable Inverter/Buffer: The XOR gates can be configured to act as inverters or buffers based on the input connections.
- General Digital Logic Circuits: Suitable for various digital logic applications where XOR functionality is required.
Q & A
- What is the primary function of the SN74HC86?
The SN74HC86 contains four independent 2-input XOR gates, each performing the Boolean function Y = A ⊕ B in positive logic.
- What is the operating voltage range of the SN74HC86?
The device operates over a voltage range from 2 V to 6 V.
- What is the operating temperature range of the SN74HC86?
The device can operate in temperatures ranging from -40°C to +85°C.
- How many LSTTL loads can the SN74HC86 support?
The device supports fanout up to 10 LSTTL loads.
- What are the key features of the SN74HC86's inputs and outputs?
The device has buffered inputs and balanced CMOS push-pull outputs, along with clamp diode structures on both inputs and outputs.
- Can the SN74HC86 be used for phase difference detection?
Yes, it can be used to detect phase differences in input signals, making it useful in clock synchronization and phase detection circuits.
- How should the input signals be conditioned for the SN74HC86?
Input signals should have fast edge rates to avoid excessive current consumption and oscillations. For slow or noisy input signals, a device with a Schmitt-trigger input should be used to condition the input signal.
- What are the recommendations for output considerations?
The positive supply voltage is used to produce the output HIGH voltage, and drawing current from the output will decrease the output voltage. Similarly, sinking current into the output will increase the output voltage.
- How should unused outputs be handled?
Unused outputs can be left floating but should not be connected directly to VCC or ground.
- What is the significance of the 'PWR' suffix in the SN74HC86PWR package?
The 'PWR' suffix indicates that the device is packaged in a TSSOP (Thin Shrink Small Outline Package), which is compact and suitable for space-constrained designs.
