Overview
The 74HC138PW/S410118 is a 3-to-8 line decoder/demultiplexer produced by NXP USA Inc. This integrated circuit is part of the 74HC series and is designed to decode three binary weighted address inputs (A0, A1, and A2) into eight mutually exclusive outputs (Y0 to Y7). The device features three enable inputs (E1, E2, and E3), allowing for flexible control over the output states. It operates with a wide supply voltage range from 2.0 to 6.0 V, making it versatile for various applications.
Key Specifications
| Type number | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|
| 74HC138PW | 2.0 - 6.0 | CMOS | ± 5.2 | 12 | Low | -40 ~ 125 | 125 | 4.7 | 55.5 | TSSOP16 |
Key Features
- Decodes three binary weighted address inputs to eight mutually exclusive outputs.
- Three enable inputs (E1, E2, and E3) for flexible control.
- Wide supply voltage range from 2.0 to 6.0 V.
- CMOS low power dissipation.
- High noise immunity.
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level B.
- Demultiplexing capability.
- Multiple input enable for easy expansion.
- Ideal for memory chip select decoding.
- Active LOW mutually exclusive outputs.
- ESD protection: HBM ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V.
- Complies with JEDEC standards: JESD8C (2.7 V to 3.6 V) and JESD7A (2.0 V to 6.0 V).
Applications
- Memory chip select decoding.
- Demultiplexing applications.
- Expansion to larger decoders (e.g., 1-of-32 decoder with four '138 ICs and one inverter).
- General digital logic circuits requiring decoding or demultiplexing functions.
Q & A
- What is the primary function of the 74HC138PW?
The primary function is to decode three binary weighted address inputs into eight mutually exclusive outputs.
- What is the supply voltage range for the 74HC138PW?
The supply voltage range is from 2.0 to 6.0 V.
- What are the logic switching levels for the 74HC138PW?
The logic switching levels are CMOS for the 74HC138 and TTL for the 74HCT138.
- How many enable inputs does the 74HC138PW have?
The device has three enable inputs (E1, E2, and E3).
- What is the output drive capability of the 74HC138PW?
The output drive capability is ± 5.2 mA.
- What is the typical propagation delay (tpd) for the 74HC138PW?
The typical propagation delay is 12 ns.
- Does the 74HC138PW have ESD protection?
Yes, it has ESD protection: HBM ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V.
- What are the operating temperature ranges for the 74HC138PW?
The operating temperature ranges are from -40 °C to +85 °C and from -40 °C to +125 °C.
- What package options are available for the 74HC138PW?
The device is available in a TSSOP16 package.
- Can the 74HC138PW 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.
