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74LVC138AD

Name: 74LVC138AD
Rating: 4.7 (12 reviews)

DECODER/DRIVER, LVC/LCX/Z SERIES

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Mfr。パート #74LVC138AD
パッケージ
データシート
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仕様

Supplier	Rochester Electronics, LLC
Package	Bulk
ProductStatus	Active

概要

Description

74LVC138AD is a 3-to-8 line decoder/demultiplexer in the 74LVC CMOS family. It decodes three binary select inputs (A, B, C) into one of eight active-low outputs (Y0–Y7).
Key features
- Three enable inputs (G1, G2A, G2B): the device is enabled when G1 is HIGH and G2A/G2B are LOW.
- When enabled, Yi = LOW for the binary value N = ABC; all other Yj = HIGH.
- If disabled, all outputs are HIGH.
- Outputs are not tri-stated.
- Designed for single-supply, low-voltage operation; check the datasheet for the exact Vcc range and input thresholds.
Pinout (typical 14-pin package)
- A, B, C inputs; G1, G2A, G2B enables; Y0–Y7 outputs.
Typical applications
- Address decoding, memory/peripheral selection, and data routing/demultiplexing.
Note
- AD is a packaging/variant code. For timing (propagation delay, power), and exact voltage ranges, consult the specific datasheet for the 74LVC138AD you’re using.

Features

- 3-to-8 line decoder/demultiplexer
- Outputs Y0–Y7 are active low
- Enable inputs: G1 (active high), G2A and G2B (both active low)
- When not enabled, all outputs are high
- Vcc range: 1.65 V to 3.6 V (LVC family)
- CMOS/TTL-compatible inputs
- Low power, high-speed CMOS device
- Package options: 14-pin (DIP, SOIC), Pb-free/RoHS-compliant (AD variant)
- Common applications: address decoding, data routing/demuxing, memory interfacing

Package

The 74LVC138AD is in a 14-pin Small Outline IC package (SOIC), the D‑package variant.

Pinout

- Pin count: 14 pins (DIP/SOIC).
- Function: 3-to-8 decoder/demultiplexer with active-low outputs. It decodes inputs A, B, C to one of eight outputs Y0–Y7; only the selected output goes low when the enables are active (G1 high, G2A and G2B low).

Manufacturer

Manufacturer: Texas Instruments (TI).
What kind of company: TI is an American multinational semiconductor company that designs and manufactures analog and digital integrated circuits, including logic devices like the 74LVC138A. It is one of the world's largest semiconductor manufacturers.

Application

74LVC138AD is a 3-to-8 line decoder/demultiplexer with active-low outputs (G1 high, G2A/G2B low).
Applications:
- Address decoding and chip-select generation for memories and peripherals
- Demultiplexing a control/address bus to enable one of eight devices
- One-hot enables for registers, latches, or display drivers
- Bus interfacing and I/O expansion in MCUs/PLDs
- Timing-critical decoders in digital logic

Equivalent

Equivalents (3-to-8 decoders with active-low outputs) across popular families:
- SN74LS138 (TTL, 5V)
- SN74HC138 (CMOS, 2–6V)
- SN74HCT138 (TTL-compatible CMOS, 4.5–5.5V)
- SN74LVC138AD (the same family in LVC)
Other vendors offer equivalents under 74xx138 part numbers (e.g., NXP, TI).