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Texas Instruments SN74HC138NSR

Part No.:: SN74HC138NSR

Manufacturer:: Texas Instruments

Package:: 16-SOIC (0.209, 5.30mm Width)

Datasheet:: SN74HC138NSR.pdf

Description:: IC DECODER/DEMUX 1 X 3:8 16SO

In Stock:: 3523

Quantity:: Add To Cart

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SN74HC138NSR Specifications

Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®,Bulk
Series:
74HC
ProductStatus:
Active
Type:
Decoder/Demultiplexer
Circuit:
1 x 3:8
IndependentCircuits:
1
Current-OutputHighLow:
5.2mA, 5.2mA
VoltageSupplySource:
Single Supply
Voltage-Supply:
2V ~ 6V
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Surface Mount

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SN74HC138NSR information

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SN74HC138NSR Typical application Circuitry

SN74HC138NSR

The SN74HC138NSR is a high-speed CMOS device designed for various digital applications. This piece focuses on its functionality, application scenarios, parameter features, a specific circuit connection example, and considerations in circuit design. Throughout, the key term "SN74HC138NSR" will be prominently featured.

Functionality: This 3-to-8 line decoder/demultiplexer is called the SN74HC138NSR. It takes three binary input signals and decodes them into one of eight mutually exclusive outputs. This is particularly useful in applications where binary to multiple line decoding is required.

Application Scenarios: A common application of the SN74HC138NSR is in memory chip selection for microprocessor systems. It's used to decode address signals to select a particular memory chip out of several connected to a microprocessor bus.

Parameter Features: This chip operates with a typical voltage range of 2V to 6V, making it compatible with TTL levels. Its low power consumption and good noise immunity make it indispensable for portable and battery-operated devices.

Circuit Connection Example:

- Power Supply Pins: Connect VCC (Pin 16) to a +5V supply, and GND (Pin 8) to ground.

- Input Pins: Connect A0, A1, and A2 (Pins 1, 2, and 3) to the output of the microprocessor or another control logic for address decoding.

- Enable Pins: Connect G1 and G2A (Pins 6 and 4) to ground to enable the device. G2B (Pin 5) should be connected to a logic high level.

- Output Pins: Connect Y0 to Y7 (Pins 15, 14, 13, 12, 11, 10, 9, and 7) to the enable pin of the memory chips or other devices you are controlling.

Design Considerations:

- Input Signal Integrity: Ensure that input signals to A0, A1, and A2 are stable and free from noise to prevent erroneous output.

- Power Supply Stability: Reliable performance depends on a steady power supply.

- Output Load: Consider the load on each output pin; excessive load can affect the performance and reliability of the outputs.

In conclusion, the SN74HC138NSR is a versatile and efficient chip suitable for a wide range of digital decoding applications. Its low power consumption, high noise immunity, and wide operating voltage range make it an excellent choice for integrated digital systems.

SN74HC138NSR FAQ

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6. What is the process for return or replacement of SN74HC138NSR?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the SN74HC138NSR we delivered, we will accept the replacement or return of the SN74HC138NSR only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of SN74HC138NSR.

(3)The PartNo is unused and only in the original unpacked packaging.

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations