Overview
The SN74AHCT244PW is an octal buffer/line driver produced by Texas Instruments. This device 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 ensuring the high-impedance state during power-up or power-down by tying OE to VCC through a pullup resistor.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC | V | 4.5 | - | 5.5 |
| Operating Temperature | °C | -40 | - | 85 |
| Input Voltage (VIH) | V | 2 | - | - |
| Input Voltage (VIL) | V | - | - | 0.8 |
| Output Voltage (VOH) | V | - | - | 4.1 |
| Output Voltage (VOL) | V | -0.2 | - | 0.5 |
| Propagation Delay (tPHL) | ns | 5.9 | - | 9.5 |
| Propagation Delay (tPLH) | ns | 5.9 | - | 9.5 |
| Power Dissipation Capacitance (Cpd) | pF | - | 8.2 | - |
| Package Type | - | - | - | TSSOP-20 |
Key Features
- VCC is optimized at 5 V, with an operating range of 4.5 V to 5.5 V.
- Allows up voltage translation from 3.3 V to 5 V, with inputs accepting VIH levels of 2 V.
- Slow edge rates minimize output ringing.
- Inputs are TTL-voltage compatible.
- Separate output-enable (OE) inputs for each 4-bit buffer/line driver.
Applications
- Buffering and driving signals in digital circuits where voltage translation is required.
- Use in systems that require TTL-compatible inputs and CMOS-compatible outputs.
- Applications where slow edge rates are beneficial to reduce output ringing and noise.
- General-purpose digital logic circuits requiring 3-state outputs.
Q & A
- What is the operating voltage range of the SN74AHCT244PW?
The operating voltage range is 4.5 V to 5.5 V.
- What is the purpose of the output-enable (OE) input?
The OE input controls whether the outputs are in the high-impedance state or passing data from the A inputs to the Y outputs.
- What type of inputs does the SN74AHCT244PW support?
The device supports TTL-voltage compatible inputs.
- What is the propagation delay of the SN74AHCT244PW?
The propagation delay (tPHL and tPLH) ranges from 5.9 ns to 9.5 ns.
- What is the package type of the SN74AHCT244PW?
The package type is TSSOP-20.
- What is the operating temperature range of the SN74AHCT244PW?
The operating temperature range is -40°C to 85°C.
- Does the SN74AHCT244PW support voltage translation?
Yes, it allows up voltage translation from 3.3 V to 5 V.
- How do the slow edge rates benefit the device?
The slow edge rates minimize output ringing and noise.
- Is the SN74AHCT244PW still in production?
No, this product is no longer manufactured.
- What should be done to ensure the high-impedance state during power-up or power-down?
OE should be tied to VCC through a pullup resistor.
