SN74LS138N Datasheet PDF – Decoder / Demultiplexer

Part Number : SN74LS138N


Package : DIP 16 Pin type

Manufacturers : Texas Instruments, Motorola





These Schottky-clamped TTL MSI circuits are designed to be used in high-performance memory decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the Schottky-clamped system decoder is negligible.


Pinouts :

SN74LS138N datasheet



The LS138, SN54S138, and SN74S138A decode one of eight lines dependent on the conditions at the three binary select inputs and the three enable inputs. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications.

All of these decoder/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line-ringing and to simplify system design.

The SN54LS138 and SN54S138 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74LS138 and SN74S138A are characterized for operation from 0°C to 70°C.


SN74LS138N Datasheet PDF Download

SN74LS138N pdf

Other data sheets within the file : SN54LS138, SN54LS138J, SN54S138, SN54S138W, SN74LS138

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SCT2272T4 Datasheet – Remote Control Decoder ( PDF )

Part Number : SCT2272T4, SCT2272GM

Function : Remote Control Decoder

Package : SOP 18 Pin Type

Manufacturers : Silvan Chip Electronics


SCT2272T4 decoder


1. CMOS Technology
2. Low Power Consumption
3. Very High Noise Immunity
4. Single Resistor Oscillator
5. Latch or Momentary Output Type

Pinout :


1. Car Security System
2. Garage Door Controller
3. Remote Control Fan
4. Home Security/Automation System
5. Remote Control Toys
6. Remote Control for Industrial Use


The Device is equivalent : [ PT2272.pdf ]

Reference PDF : [ SCT2272GM.pdf ]

SCT2272T4 Datasheet

SCT2272T4 pdf

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