Overview
The MC74HC238ADTR2G is a 1-of-8 Decoder/Demultiplexer produced by onsemi. This device is part of the high-performance silicon-gate CMOS family and is identical in pinout to the LS238. It decodes a three-bit address to one of eight active-high outputs, making it versatile for various digital circuit applications. The device features three Chip Select inputs, two active-low and one active-high, which facilitate demultiplexing, cascading, and chip-selecting functions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage (VCC) | 2.0 to 6.0 | V |
| DC Input Voltage (Vin) | –0.5 to VCC + 0.5 | V |
| DC Output Voltage (Vout) | –0.5 to VCC + 0.5 | V |
| Operating Temperature (TA) | –55 to +125 | °C |
| Input Rise and Fall Time | 0 to 1000 ns (depending on VCC) | ns |
| Maximum Propagation Delay (tPLH, tPHL) | 23 to 205 ns (depending on VCC and input) | ns |
| Maximum Output Transition Time (tTLH, tTHL) | 13 to 110 ns (depending on VCC) | ns |
| Maximum Input Capacitance (Cin) | 10 pF | pF |
| Power Dissipation Capacitance (CPD) | 55 pF (typical at 25°C, VCC = 5.0 V) | pF |
| Package Type | TSSOP-16 (Pb-Free) |
Key Features
- Output Drive Capability: 10 LSTTL Loads
- Outputs Directly Interface to CMOS, NMOS, and TTL
- Low Input Current: 1.0 µA
- High Noise Immunity Characteristic of CMOS Devices
- In Compliance with the Requirements Defined by JEDEC Standard No. 7A
- Chip Complexity: 100 FETs or 29 Equivalent Gates
- NLV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC-Q100 Qualified and PPAP Capable
- Pb-Free Devices
Applications
The MC74HC238ADTR2G is suitable for a variety of digital circuit applications, including:
- Demultiplexing functions where a single input needs to be routed to one of multiple outputs.
- Cascading applications where multiple decoders need to be connected to increase the number of output lines.
- Chip-selecting functions in memory and I/O circuits.
- Automotive and industrial control systems due to its AEC-Q100 qualification.
Q & A
- What is the primary function of the MC74HC238ADTR2G?
The primary function is to decode a three-bit address to one of eight active-high outputs, acting as a 1-of-8 decoder/demultiplexer.
- What are the operating voltage and temperature ranges for this device?
The operating voltage range is 2.0 to 6.0 V, and the operating temperature range is –55 to +125 °C.
- How many Chip Select inputs does the MC74HC238ADTR2G have?
The device has three Chip Select inputs: two active-low and one active-high.
- What is the maximum propagation delay for this device?
The maximum propagation delay ranges from 23 to 205 ns, depending on the supply voltage and input conditions.
- Is the MC74HC238ADTR2G Pb-Free?
- What are the package types available for this device?
The device is available in TSSOP-16 (Pb-Free) packages.
- What is the significance of the NLV prefix in the part number?
The NLV prefix indicates that the device is AEC-Q100 qualified and PPAP capable, making it suitable for automotive and other applications requiring unique site and control change requirements.
- How does the device handle unused inputs and outputs?
Unused inputs must always be tied to an appropriate logic voltage level (either GND or VCC), and unused outputs must be left open.
- What is the maximum output transition time for this device?
The maximum output transition time ranges from 13 to 110 ns, depending on the supply voltage.
- Is the device compliant with any specific industry standards?
