Overview
The 74AC11244DWR, produced by Texas Instruments, is an octal buffer or line driver designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. This device can be used as two 4-bit buffers or one 8-bit buffer, featuring active-low output-enable (OE) inputs. When the OE input is low, the device passes noninverted data from the A inputs to the Y outputs. When the OE input is high, the outputs are in the high-impedance state. The 74AC11244DWR is characterized for operation over a temperature range of –40°C to 85°C and is available in various package options, including SOIC, SSOP, and TSSOP.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 3 | 5 | 5.5 | V |
| High-Level Input Voltage (VIH) | 2.1 (VCC = 3V) | 3.15 (VCC = 4.5V) | 3.85 (VCC = 5.5V) | V |
| Low-Level Input Voltage (VIL) | 0.9 (VCC = 3V) | 1.35 (VCC = 4.5V) | 1.65 (VCC = 5.5V) | V |
| High-Level Output Current (IOH) | -24 | mA | ||
| Low-Level Output Current (IOL) | 24 | mA | ||
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Input Transition Rise or Fall Rate | 0 | 10 | ns/V | |
| Propagation Delay Time (tPLH, tPHL) | 1.5 | 9.3 (VCC = 3.3V), 6.7 (VCC = 5V) | ns |
Key Features
- 3-State Outputs: The device features 3-state outputs that can drive bus lines or buffer memory address registers.
- Flow-Through Architecture: Optimizes PCB layout by allowing for easier signal routing.
- Center-Pin VCC and GND Pin Configurations: Minimizes high-speed switching noise.
- High Latch-Up Immunity: 500-mA typical latch-up immunity at 125°C.
- Multiple Package Options: Available in SOIC, SSOP, TSSOP, and standard plastic DIP packages.
- Active-Low Output-Enable (OE) Inputs: Allows for control over the output state, enabling or disabling the outputs as needed.
Applications
- Memory Address Drivers: Ideal for driving memory address lines due to its 3-state capability.
- Clock Drivers: Suitable for distributing clock signals in digital systems.
- Bus-Oriented Receivers and Transmitters: Used in bus-oriented systems to buffer and drive signals.
- General Digital Logic: Can be used in various digital logic applications requiring buffering and signal conditioning.
Q & A
- What is the operating temperature range of the 74AC11244DWR?
The device operates over a temperature range of –40°C to 85°C).
- What are the different package options available for the 74AC11244DWR?
The device is available in SOIC, SSOP, TSSOP, and standard plastic DIP packages).
- How do the 3-state outputs function in the 74AC11244DWR?
The 3-state outputs can be in one of three states: high, low, or high-impedance. When the OE input is low, the outputs are active; when the OE input is high, the outputs are in the high-impedance state).
- What is the purpose of the active-low output-enable (OE) input?
The active-low OE input allows for control over the output state, enabling or disabling the outputs as needed).
- What is the recommended supply voltage range for the 74AC11244DWR?
The recommended supply voltage range is from 3 V to 5.5 V).
- How does the flow-through architecture benefit the PCB layout?
The flow-through architecture optimizes PCB layout by allowing for easier signal routing).
- What is the typical latch-up immunity of the 74AC11244DWR?
The device has a 500-mA typical latch-up immunity at 125°C).
- Can the 74AC11244DWR be used as both a 4-bit and an 8-bit buffer?
Yes, the device can be used as two 4-bit buffers or one 8-bit buffer).
- How should the OE input be managed during power up or power down to ensure the high-impedance state?
The OE input should be tied to VCC through a pullup resistor to ensure the high-impedance state during power up or power down).
- What are the typical propagation delay times for the 74AC11244DWR?
The propagation delay times (tPLH, tPHL) range from 1.5 ns to 9.3 ns for VCC = 3.3 V and from 1.5 ns to 6.7 ns for VCC = 5 V).
