Overview
The SN74HC240NG4, produced by Texas Instruments, is an octal buffer and line driver integrated circuit. This device is designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The SN74HC240 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 | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| VIL Low-Level Input Voltage | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| TA Operating Temperature | -40 | 85 | °C | |
| tpd Propagation Delay (A to Y) | 9 (VCC=6V), 10 (VCC=4.5V), 50 (VCC=2V) | ns | ||
| Output Drive Current | ±6 | mA (at VCC=5V) | ||
| Input Current | 1 | µA | ||
| ICC Power Consumption | 80 | µA |
Key Features
- Wide operating voltage range of 2V to 6V
- High-current outputs drive up to 15 LSTTL loads
- Low power consumption, 80µA max ICC
- Typical propagation delay (tpd) of 9ns at VCC=6V
- ±6mA output drive at 5V
- Low input current of 1µA max
- 3-state outputs drive bus lines or buffer memory address registers
Applications
The SN74HC240NG4 is suitable for various applications, including:
- 3-state memory address drivers
- Clock drivers
- Bus-oriented receivers and transmitters
- General-purpose buffering and line driving in digital systems
Q & A
- What is the operating voltage range of the SN74HC240NG4?
The operating voltage range is from 2V to 6V.
- How many LSTTL loads can the outputs of the SN74HC240NG4 drive?
The outputs can drive up to 15 LSTTL loads.
- What is the typical propagation delay of the SN74HC240NG4 at VCC=6V?
The typical propagation delay is 9ns at VCC=6V.
- What is the maximum output drive current at VCC=5V?
The maximum output drive current is ±6mA at VCC=5V.
- What is the maximum input current of the SN74HC240NG4?
The maximum input current is 1µA.
- What is the power consumption of the SN74HC240NG4?
The power consumption is 80µA max ICC.
- How do the output-enable (OE) inputs function on the SN74HC240NG4?
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 SN74HC240NG4?
The device is used in 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
- What is the operating temperature range of the SN74HC240NG4?
The operating temperature range is from -40°C to 85°C.
- What type of package is the SN74HC240NG4 available in?
The device is available in various packages, including PDIP (N) and TSSOP.
