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China ASIC SM74HC138 3‑8 Decoder Datasheet
The SM74HC138 is a high‑speed CMOS 3‑to‑8 line decoder with three address inputs (A0‑A2) and eight active‑low outputs (Y0‑Y7). It includes three enable pins (E1‑E3) that must be set correctly for the outputs to become active. The device is intended for digital circuits and consumer‑electronics applications.
The document provides pin definitions, electrical characteristics such as supply voltage, input thresholds, output levels, and timing parameters, as well as package options (SOP16, TSSOP16, QFN16) and mechanical dimensions. This manual is written in Chinese.
Covers: Overview · Pin Description · Electrical Parameters · Package Information · Package Dimensions
Latest China ASIC manuals
China ASIC SM74HC138 3‑8 Decoder Datasheet
Datasheet 7 pages · 875 KB · ZHDatasheet for the SM74HC138 3‑8 decoder, a high‑speed CMOS device with low power consumption and TTL‑compatible pins.
Which document do I need?
Datasheet
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in China ASIC manuals
What is the allowed supply voltage range for the SM74HC138?
The device can operate with a supply voltage from –0.5 V up to +7.0 V.
What are the logic high and low input voltage thresholds?
A high input is recognized at 3.0 V (VIH) and a low input at 2.0 V (VIL) when VDD is 5 V.