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| Product attributes | Property Value |
| Manufacturer | National Semiconductor |
| Product Series | 74S |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Input Type | - |
| Output Type | 3-State |
| Current - Output High, Low | 15mA, 64mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 20-CDIP (0.300", 7.62mm) |
| Supplier Device Package | 20-CDIP |
The DM74S240J from National Semiconductor is a high-speed, inverting buffer in the 74S Schottky logic family. It features two channels with 3-State outputs, capable of sinking 64mA and sourcing 15mA. Operating from a standard 5V supply (4.75V to 5.25V), it is designed for legacy TTL systems requiring robust signal buffering and inversion. Housed in a 20-CDIP ceramic package, it operates over a commercial temperature range of 0°C to 70°C, making it suitable for classic computing and industrial applications.
- High Sink Current (64mA): Can drive heavy loads such as relays, LEDs, or long bus lines directly, reducing component count.
- Schottky Technology: Provides high-speed operation, critical for timing-sensitive applications in legacy systems.
- 3-State Outputs: Allows for bus multiplexing and prevents bus contention in multi-device configurations.
- Inverting Function: Offers design flexibility by providing signal inversion where needed, without additional logic gates.
Legacy 5V TTL Bus Driving
Use the DM74S240J to buffer and drive 5V TTL buses in legacy systems. Its high sink current (64mA) ensures robust signal delivery to multiple loads.
Inverting Signal Conditioning
When signal inversion is required, this buffer provides the necessary logic inversion while also offering high drive strength, combining two functions in one IC.
Memory Address Decoding
In older computer systems, this buffer can drive address lines to memory chips, reducing loading on the CPU and improving system stability.
Peripheral Interface Buffering
For interfacing with legacy peripherals, the DM74S240J can buffer control and data signals, protecting the main logic from external noise and loading.
High-Current LED or Relay Driving
With 64mA sink capability, it can directly drive LEDs or small relays, eliminating the need for separate transistor drivers in some applications.
Test Equipment and Instrumentation
In benchtop test equipment, this IC can route and invert test signals, providing the necessary drive to operate over long cables.
- Q: What logic family does the DM74S240J belong to?
- A: It is part of the 74S (Schottky) logic family, known for high speed.
- Q: What is the function of this IC?
- A: It is a 2-channel, inverting buffer with 3-State outputs.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, standard for 5V TTL logic.
- Q: What is the output current capability?
- A: It can source 15mA and sink 64mA, providing strong sink current.
- Q: What package is available?
- A: It comes in a 20-CDIP (0.300", 7.62mm) ceramic dual-in-line package.
- Q: What is the operating temperature range?
- A: It operates from 0°C to 70°C, suitable for commercial applications.
DM74S240J.pdf
- Q: What logic family does the DM74S240J belong to?
- A: It is part of the 74S (Schottky) logic family, known for high speed.
- Q: What is the function of this IC?
- A: It is a 2-channel, inverting buffer with 3-State outputs.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, standard for 5V TTL logic.
- Q: What is the output current capability?
- A: It can source 15mA and sink 64mA, providing strong sink current.
- Q: What package is available?
- A: It comes in a 20-CDIP (0.300", 7.62mm) ceramic dual-in-line package.
- Q: What is the operating temperature range?
- A: It operates from 0°C to 70°C, suitable for commercial applications.