Overview
The SN74AHC244PWRE4 is an octal buffer/driver with 3-state outputs, manufactured by Texas Instruments. This device is part of the 74AHC series and is designed to provide high-speed logic functions. It is organized as two 4-bit buffers/line drivers with separate output-enable (OE) inputs. When the OE input is low, the device passes data from the A inputs to the Y outputs. When the OE input is high, the outputs are in the high-impedance state, which is essential for preventing bus contention and minimizing power consumption during power-up or power-down sequences.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage Range | 2 to 5.5 | V |
| Output Current (High/Low) | 8mA / 8mA | mA |
| Package Type | 20-TSSOP (0.173", 4.40mm Width) | |
| Number of Bits per Element | 4 | |
| Logic Type | Buffer, Non-Inverting | |
| Output Type | Push-Pull | |
| Propagation Delay (tPLH/tPHL) @ CL = 15pF | 5.8 / 5.8 | ns |
| Propagation Delay (tPZH/tPZL) @ CL = 15pF | 6.6 / 6.6 | ns |
Key Features
- VCC Optimization: The device is optimized for operation at 5 V, but it can operate over a range of 2 V to 5.5 V.
- Down Voltage Translation: Inputs can accept high-level voltages up to 5.5 V, allowing for down voltage translation.
- Slow Edge Rates: The device features slow edge rates to minimize output ringing.
- 3-State Outputs: Outputs can be placed in a high-impedance state when the OE input is high, which is crucial for bus applications.
- Low Power Consumption: The device is designed to minimize power consumption, especially during power-up or power-down sequences.
Applications
- Bus Drivers: Ideal for driving data on buses due to its 3-state output capability.
- Logic Circuits: Used in various logic circuits requiring high-speed buffer functions.
- Microprocessor Systems: Suitable for use in microprocessor systems where data needs to be buffered or driven.
- Peripheral Devices: Can be used to interface with peripheral devices that require buffered or driven signals.
Q & A
- What is the operating temperature range of the SN74AHC244PWRE4?
The operating temperature range is -40°C to 125°C.
- What is the supply voltage range for this device?
The supply voltage range is 2 V to 5.5 V.
- What type of outputs does the SN74AHC244PWRE4 have?
The device has push-pull outputs with 3-state capability.
- How many bits per element does this device have?
Each element is a 4-bit buffer/line driver.
- What is the propagation delay for the SN74AHC244PWRE4?
The propagation delay (tPLH/tPHL) at CL = 15pF is typically 5.8 ns.
- How do I ensure the high-impedance state during power-up or power-down?
The OE input should be tied to VCC through a pullup resistor to ensure the high-impedance state.
- What is the package type of the SN74AHC244PWRE4?
The device is packaged in a 20-TSSOP (0.173", 4.40mm Width).
- Can the SN74AHC244PWRE4 handle high-level input voltages?
Yes, the device can accept high-level input voltages up to 5.5 V.
- What are some common applications for the SN74AHC244PWRE4?
Common applications include bus drivers, logic circuits, microprocessor systems, and peripheral devices.
- Is the SN74AHC244PWRE4 RoHS compliant?
Yes, the device is RoHS compliant.
