Overview
The SN74HCT240DWRE4 is an octal buffer and line driver produced by Texas Instruments. This component is part of the 74HCT series, which is compatible with TTL (Transistor-Transistor Logic) levels and operates within the CMOS (Complementary Metal-Oxide-Semiconductor) logic family. It is designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
The device 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, making it suitable for bus applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage Range | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage (VCC = 6V) | 4.2 | V | ||
| VIL Low-Level Input Voltage (VCC = 6V) | 1.8 | V | ||
| IOH Output Current (VCC = 5V, VOH = 2.4V) | -20 | mA | ||
| IOL Output Current (VCC = 5V, VOL = 0.4V) | 20 | mA | ||
| tpd Propagation Delay (A to Y, VCC = 6V) | 9 | 17 | 25 | ns |
| ten OE to Y Enable Time (VCC = 6V) | 13 | 26 | 38 | ns |
| tdis OE to Y Disable Time (VCC = 6V) | 21 | 26 | 38 | ns |
| TJ Junction Temperature | 150 | °C | ||
| Tstg Storage Temperature Range | -65 | 150 | °C |
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 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
- Separate output-enable (OE) inputs for each 4-bit buffer/driver
Applications
- 3-state memory address drivers
- Clock drivers
- Bus-oriented receivers and transmitters
- General-purpose buffering and driving applications
- Systems requiring low power consumption and high-speed data transfer
Q & A
- What is the operating voltage range of the SN74HCT240DWRE4?
The operating voltage range is from 2V to 6V.
- How many LSTTL loads can the SN74HCT240DWRE4 drive?
The device can drive up to 15 LSTTL loads.
- What is the typical propagation delay of the SN74HCT240DWRE4 at VCC = 6V?
The typical propagation delay is 9ns.
- What is the maximum output current of the SN74HCT240DWRE4 at VCC = 5V?
The maximum output current is ±6mA.
- What is the purpose of the output-enable (OE) input?
The OE input controls the state of the outputs. 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 SN74HCT240DWRE4?
The device is typically used in 3-state memory address drivers, clock drivers, bus-oriented receivers and transmitters, and general-purpose buffering and driving applications.
- What is the maximum junction temperature for the SN74HCT240DWRE4?
The maximum junction temperature is 150°C.
- What is the recommended bypass capacitor for the power supply?
A 0.1μF capacitor is recommended, and it is acceptable to parallel multiple bypass capacitors to reject different frequencies of noise.
- How many bits are organized in each buffer/driver of the SN74HCT240DWRE4?
The device is organized as two 4-bit buffers/drivers.
- What is the low power consumption characteristic of the SN74HCT240DWRE4?
The device has a low power consumption of 80µA max ICC.
