Overview
The 74HCT238D-Q100118 is a 3-to-8 line decoder/demultiplexer produced by NXP USA Inc., now part of Nexperia. This device decodes three binary weighted address inputs (A0, A1, and A2) to eight mutually exclusive outputs (Y0 to Y7). It features three enable inputs (E1, E2, and E3), allowing for flexible control over the output states. The device is particularly useful for applications requiring demultiplexing and memory chip select decoding.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC | Operating Voltage Range | 2.0 | - | 6.0 | V |
| VIL | LOW-level input voltage (VCC = 4.5 V) | 1.35 | - | 2.1 | V |
| VIH | HIGH-level input voltage (VCC = 4.5 V) | 3.15 | - | 4.2 | V |
| tpd | Propagation Delay (VCC = 4.5 V, CL = 15 pF) | 18 | - | 35 | ns |
| IO | Output Drive Capability | ±4 | - | - | mA |
| Tamb | Ambient Temperature Range | -40 | - | +125 | °C |
| Package | Package Type | - | - | SO16 (SOT109-1) | - |
Key Features
- Decodes three binary weighted address inputs to eight mutually exclusive outputs.
- Features three enable inputs (E1, E2, and E3) for flexible control.
- Demultiplexing capability by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes.
- Multiple input enable for easy expansion to a 1-of-32 decoder with just four '238 ICs and one inverter.
- Ideal for memory chip select decoding.
- Active HIGH mutually exclusive outputs.
- Complies with JEDEC standards (JESD8C and JESD7A).
- Input levels: TTL level for 74HCT238.
- ESD protection: HBM exceeds 2000 V, CDM exceeds 1000 V.
- Low power dissipation and high noise immunity.
- Automotive product qualification in accordance with AEC-Q100 (Grade 1).
Applications
- Memory chip select decoding.
- Demultiplexing applications.
- Automotive electronics due to AEC-Q100 qualification.
- General digital logic circuits requiring decoding or demultiplexing functions.
- Expansion to larger decoder configurations using multiple ICs.
Q & A
- What is the primary function of the 74HCT238D-Q100118?
The primary function is to decode three binary weighted address inputs to eight mutually exclusive outputs.
- What are the input levels for the 74HCT238D-Q100118?
The input levels are TTL (Transistor-Transistor Logic) levels.
- How many enable inputs does the device have?
The device has three enable inputs (E1, E2, and E3).
- What is the operating voltage range for the 74HCT238D-Q100118?
The operating voltage range is from 2.0 V to 6.0 V.
- What is the propagation delay for the 74HCT238D-Q100118?
The propagation delay is approximately 18 to 35 ns at VCC = 4.5 V and CL = 15 pF.
- What kind of ESD protection does the device have?
The device has ESD protection exceeding 2000 V for HBM and 1000 V for CDM.
- Is the 74HCT238D-Q100118 suitable for automotive applications?
Yes, it is qualified to the Automotive Electronics Council (AEC) standard Q100 (Grade 1).
- What is the ambient temperature range for the device?
The ambient temperature range is from -40 °C to +125 °C.
- What package options are available for the 74HCT238D-Q100118?
The device is available in the SO16 (SOT109-1) package.
- Can the 74HCT238D-Q100118 be used as a demultiplexer?
Yes, it can be used as an eight-output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes.
