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| Product attributes | Property Value |
| Manufacturer | National Semiconductor |
| Product Series | 54HC |
| 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 | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-CLCC |
| Supplier Device Package | 20-LCCC (8.89x8.89) |
The MM54HC240E/883 is a CMOS inverting buffer from National Semiconductor, designed for high-reliability and low-power applications. It operates from 2V to 6V, delivering 7.8mA source and sink current, ideal for signal inversion and bus isolation. The 3-State outputs enable flexible multiplexing, while the 20-CLCC hermetic package provides excellent environmental protection. Rated for -55°C to 125°C, it is well-suited for military, aerospace, and industrial control systems where dependable inverting buffering is required.
- Inverting Function: Simplifies active-low logic designs and reduces external inverter ICs.
- Wide Supply Range (2V-6V): Ensures compatibility with multiple logic standards.
- Low CMOS Power Dissipation: Ideal for battery-operated and energy-harvesting systems.
- Hermetic Ceramic Package: Offers superior reliability in harsh environments.
Active-Low Bus Control
In industrial PLCs, the MM54HC240E/883 provides inverting buffers for active-low enable signals. This simplifies interfacing with legacy relay logic where inverted control lines are standard, reducing firmware complexity.
Signal Inversion in Sensor Conditioning
When a sensor outputs a positive-going signal but the ADC expects negative-going, this buffer inverts the signal without additional op-amps. The 3-State output allows multiplexing multiple sensors onto a single ADC channel.
High-Impedance Isolation for Test Equipment
In automated test fixtures, the 3-State feature isolates the device-under-test from the measurement bus when not selected. This prevents leakage currents from corrupting low-level measurements.
Low-Power Data Acquisition in Remote Nodes
For wireless sensor networks, this buffer's CMOS technology draws microamps when idle. It can buffer wake-up interrupts from multiple sensors, ensuring the microcontroller stays in sleep mode longer.
Driving LED Displays in Cockpit Controls
The 7.8mA output can directly drive indicator LEDs with a series resistor. The inverting function allows active-low logic to light LEDs, matching common avionics display conventions.
Redundant Safety Shutdown Paths
In safety-critical systems, two inverting buffers can be wired in series to create a fail-safe shutdown signal. If one buffer fails, the logic level still propagates correctly, maintaining system integrity.
- Q: What is the logic family of the MM54HC240E/883?
- A: It belongs to the 54HC family, combining CMOS low power with high-speed operation.
- Q: What function does this IC perform?
- A: It is an inverting buffer with 2 channels, useful for signal inversion and line driving.
- Q: What output type is available?
- A: It provides 3-State outputs, allowing connection to shared buses with tri-state control.
- Q: What is the operating voltage range?
- A: It operates from 2V to 6V, supporting both 3.3V and 5V logic levels.
- Q: What is the output current rating?
- A: It can source and sink 7.8mA, suitable for driving CMOS and TTL loads.
- Q: What package is offered?
- A: It is available in a 20-CLCC ceramic package for high-reliability applications.
MM54HC240E/883.pdf
- Q: What is the logic family of the MM54HC240E/883?
- A: It belongs to the 54HC family, combining CMOS low power with high-speed operation.
- Q: What function does this IC perform?
- A: It is an inverting buffer with 2 channels, useful for signal inversion and line driving.
- Q: What output type is available?
- A: It provides 3-State outputs, allowing connection to shared buses with tri-state control.
- Q: What is the operating voltage range?
- A: It operates from 2V to 6V, supporting both 3.3V and 5V logic levels.
- Q: What is the output current rating?
- A: It can source and sink 7.8mA, suitable for driving CMOS and TTL loads.
- Q: What package is offered?
- A: It is available in a 20-CLCC ceramic package for high-reliability applications.