Overview
The CD74HC240M is a high-speed CMOS logic octal buffer/line driver produced by Texas Instruments. This component is part of the HC240 series, which includes inverting three-state buffers with two active-low output enables. The CD74HC240M is designed to operate over a wide temperature range and offers significant power reduction compared to traditional LSTTL logic ICs.
The device features buffered inputs, high-current bus driver outputs, and three-state outputs, making it suitable for various digital logic applications. It is available in several package types, including SOIC and PDIP, to accommodate different design requirements.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Propagation Delay (Data to Outputs) | ns | 8 | 9 | 22 |
| Output Enable and Disable Time | ns | 30 | 38 | 45 |
| Output Transition Time | ns | 12 | 15 | 18 |
| Input Capacitance | pF | 10 | 10 | 10 |
| Three-state Output Capacitance | pF | 20 | 20 | 20 |
| Power Dissipation Capacitance | pF | 38 | 40 | 40 |
| Operating Voltage Range | V | 2 | 5 | 6 |
| Operating Temperature Range | ℃ | -55 | - | 125 |
Key Features
- Inverting three-state buffers with two active-low output enables
- Buffered inputs and high-current bus driver outputs
- Three-state outputs
- Wide operating temperature range: -55℃ to 125℃
- Significant power reduction compared to LSTTL logic ICs
- High noise immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5 V for HC types
- Direct LSTTL input logic compatibility for HCT types
- CMOS input compatibility with low input current (II ≤ 1μA at VOL, VOH)
- Balanced propagation delay and transition times
- Fanout capability: 10 LSTTL loads for standard outputs, 15 LSTTL loads for bus driver outputs
Applications
- Digital logic circuits requiring high-speed and low power consumption
- Bus driver applications in microprocessor and memory systems
- Interface circuits between different logic families
- Industrial control systems and automation
- Embedded systems and IoT devices
Q & A
- What is the CD74HC240M used for?
The CD74HC240M is used as an inverting three-state buffer/line driver in digital logic circuits, providing high-speed and low power consumption.
- What are the key features of the CD74HC240M?
Key features include inverting three-state buffers, buffered inputs, high-current bus driver outputs, three-state outputs, and a wide operating temperature range.
- What is the operating voltage range of the CD74HC240M?
The operating voltage range is from 2 V to 6 V.
- What is the typical propagation delay of the CD74HC240M?
The typical propagation delay is 8 ns at VCC = 5 V and CL = 15 pF.
- What are the package options available for the CD74HC240M?
The component is available in SOIC and PDIP packages.
- What is the fanout capability of the CD74HC240M?
The fanout capability is 10 LSTTL loads for standard outputs and 15 LSTTL loads for bus driver outputs.
- Is the CD74HC240M compatible with LSTTL logic?
Yes, the HCT types are directly compatible with LSTTL input logic.
- What is the input capacitance of the CD74HC240M?
The input capacitance is 10 pF.
- What is the power dissipation capacitance of the CD74HC240M?
The power dissipation capacitance is approximately 38 pF.
- What are some common applications of the CD74HC240M?
Common applications include digital logic circuits, bus driver applications, interface circuits, industrial control systems, and embedded systems.
