74HC138 Datasheet PDF – 3-to-8 Line Decoder/Demultiplexer

Part Number: 74HC138

Function: 3-to-8 line Decoder / Demultiplexer, Inverting

Package: DIP, SMD 16 Pin

Manufacturer: Philips Semicondcutor



A 3-to-8 line decoder/demultiplexer is a digital logic component that takes a binary input and selects one of the eight output lines based on the input value.

The 74HCT138, 74HC138 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC138 / 74HCT138 decoders accept three binary weighted address inputs (A0, A1, A2) and when enabled, provide 8 mutually exclusive active LOW outputs (Y0 to Y7).




1. Demultiplexing capability

2. Multiple input enable for easy expansion

3. Ideal for memory chip select decoding

4. Active LOW mutually exclusive outputs

5. Output capability: standard

6. ICC category: MSI

Functional Diagram:



Reference site

  1. https://learn.adafruit.com/delorean-time-circuit/circuit-trickery


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Other data sheets are available within the file:

74HC138D, 74HCT138D, 74HC138PW, 74HCT138PW, 74HC138BQ, 74HCT138BQ


74HC138 Datasheet PDF


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TDA8362 Datasheet – Integrated TV Processor – Philips

What is TDA8362?

This is a type of integrated circuit (IC) that is commonly used in television sets. It is a multi-standard PAL/NTSC/SECAM chrominance and luminance signal processor that includes features such as a chrominance trap, luminance delay line, and vertical and horizontal synchronization circuits. The IC is designed to provide high-quality video output and is used in many CRT-based TV models.
Function : Integrated PAL and PAL/NTSC TV processor

Function: Integrated PAL and PAL/NTSC TV Processor

Package : DIP 52 Pin

Manufacturer: Philips Semiconductors, NXP




The TDA8360, TDA8361 and TDA8362 are single-chip TV processors which contain nearly all small signal functions that are required for a colour television receiver. For a complete receiver the following circuits need to be added: a base-band delay line (TDA4661), a tuner and output stages for audio, video and horizontal and vertical deflection.



TDA8362 Features

1. Multistandard vision IF circuit (positive and negative modulation)

2. PAL/NTSC colour decoder with automatic search system

3. Source selection for external A/V inputs (separate Y/C signals can also be applied)

4. Easy interfacing with the TDA8395 (SECAM decoder) for multistandard applications.

5. RGB control circuit with linear RGB inputs and fast blanking

6. Horizontal synchronization with two control loops and alignment-free horizontal oscillator without external components

7. Vertical count-down circuit (50/60 Hz) and vertical preamplifier

8. Low dissipation (700 mW)

9. Small amount of peripheral components compared with competition ICs

10. Vision IF amplifier with high sensitivity and good differential gain and phase

11. Integrated chrominance trap and bandpass filters (automatically calibrated)


TDA8362 Datasheet

TDA8362 pdf


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