Overview
The SN74HCT240DWR is an octal buffer and line driver produced by Texas Instruments. This component is designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. It is organized as two 4-bit buffers/drivers with separate output-enable (OE) inputs. When the OE input is low, the device passes inverted data from the A inputs to the Y outputs. When the OE input is high, the outputs are in the high-impedance state.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC (Supply Voltage) | 4.5 | 5 | 5.5 | V |
| VIH (High-level Input Voltage) | 2 | 2 | 2 | V |
| VIL (Low-level Input Voltage) | 0.8 | 0.8 | 0.8 | V |
| VOH (Output Voltage High) | 4.4 | 4.499 | 4.4 | V (IOH = -20 μA) |
| VOL (Output Voltage Low) | 0.1 | 0.1 | 0.1 | V (IOL = 20 μA) |
| ICC (Supply Current) | 8 | 80 | 80 | μA |
| tpd (Propagation Delay) | 13 | 25 | 37 | ns (VCC = 4.5 V, CL = 50 pF) |
| TA (Operating Free-Air Temperature) | -40 | 85 | °C |
Key Features
- Operating voltage range of 4.5V to 5.5V
- High-current outputs drive up to 15 LSTTL loads
- Low power consumption, 80μA max ICC
- Typical propagation delay (tpd) = 12 ns at VCC = 5V
- ±6mA output drive at 5V
- Low input current of 1μA max
- Inputs are TTL-voltage compatible
- 3-state outputs drive bus lines or buffer memory address registers
Applications
The SN74HCT240DWR is suitable for various applications including:
- 3-state memory address drivers
- Clock drivers
- Bus-oriented receivers and transmitters
- General-purpose buffering and driving of TTL-compatible signals
Q & A
- What is the operating voltage range of the SN74HCT240DWR?
The operating voltage range is from 4.5V to 5.5V.
- How many LSTTL loads can the high-current outputs drive?
The high-current outputs can drive up to 15 LSTTL loads.
- What is the maximum supply current (ICC) of the device?
The maximum supply current (ICC) is 80μA.
- What is the typical propagation delay (tpd) at VCC = 5V?
The typical propagation delay (tpd) at VCC = 5V is 12 ns.
- Are the inputs TTL-voltage compatible?
- What is the function of the output-enable (OE) input?
When OE is low, the device passes inverted data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state.
- What are the typical applications of the SN74HCT240DWR?
The device is typically used in 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
- What is the operating temperature range of the SN74HCT240DWR?
The operating free-air temperature range is from -40°C to 85°C.
- What is the package type of the SN74HCT240DWR?
The package type is SOIC (DW) with 20 pins.
- Is the SN74HCT240DWR RoHS compliant?
