Overview
The MC74LCX138DTR2G is a high-performance, 3-to-8 decoder/demultiplexer produced by onsemi. It operates from a 2.3 to 3.6 V supply voltage, making it suitable for a wide range of applications. The device features high impedance TTL compatible inputs, which significantly reduce current loading to input drivers, and TTL compatible outputs that offer improved switching noise performance. The MC74LCX138 is particularly useful for memory address decoding and other TTL level bus-oriented applications due to its 5 V tolerant inputs, allowing it to interface safely with 5 V TTL logic devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC (Supply Voltage) | 2.3 | - | 3.6 | V |
| VI (Input Voltage) | 0 | - | 5.5 | V |
| VO (Output Voltage) | 0 | - | VCC | V |
| IOH (HIGH Level Output Current) | -24 | - | - | mA |
| IOL (LOW Level Output Current) | 24 | - | - | mA |
| TA (Operating Free-Air Temperature) | -40 | - | 125 | °C |
| CIN (Input Capacitance) | - | 7 | - | pF |
| COUT (Output Capacitance) | - | 8 | - | pF |
Key Features
- Designed for 2.3 V to 3.6 V VCC operation
- 5 V tolerant inputs - interface capability with 5 V TTL logic
- LVTTL compatible and LVCMOS compatible
- 24 mA balanced output sink and source capability
- Near zero static supply current (10 µA) substantially reduces system power requirements
- Latchup performance exceeds 500 mA
- ESD performance: Human Body Model >2000 V, Machine Model >200 V
- Pb-free, halogen-free/BFR-free, and RoHS compliant
Applications
The MC74LCX138DTR2G is suitable for various applications, including:
- Memory address decoding
- TTL level bus-oriented applications
- Demultiplexing - can be used as an 8-output demultiplexer by using one of the active-LOW Enable inputs as the data input and the other Enable inputs as strobes
- Parallel expansion - can be expanded to a 1-of-32 decoder with four LCX138 devices and one inverter
Q & A
- What is the operating voltage range of the MC74LCX138DTR2G?
The MC74LCX138DTR2G operates from a 2.3 to 3.6 V supply voltage.
- What is the significance of 5 V tolerant inputs in the MC74LCX138DTR2G?
The 5 V tolerant inputs allow the device to be safely driven from 5 V TTL logic devices.
- What are the output current capabilities of the MC74LCX138DTR2G?
The device has a 24 mA balanced output sink and source capability.
- How does the MC74LCX138DTR2G reduce system power requirements?
The device has near zero static supply current (10 µA), which substantially reduces system power requirements.
- What is the ESD performance of the MC74LCX138DTR2G?
The ESD performance exceeds 2000 V for the Human Body Model and 200 V for the Machine Model.
- Can the MC74LCX138DTR2G be used as a demultiplexer?
Yes, it can be used as an 8-output demultiplexer by using one of the active-LOW Enable inputs as the data input and the other Enable inputs as strobes.
- How can the MC74LCX138DTR2G be expanded for larger decoding applications?
The device can be expanded to a 1-of-32 decoder with four LCX138 devices and one inverter.
- What are the package options available for the MC74LCX138DTR2G?
The device is available in SOIC-16 and TSSOP-16 packages.
- Is the MC74LCX138DTR2G RoHS compliant?
Yes, the device is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What is the operating temperature range of the MC74LCX138DTR2G?
The operating free-air temperature range is from -40°C to 125°C.
