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Name: 74HC138D
Brand: Toshiba Semiconductor and Storage
SKU: 74HC138D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Toshiba Semiconductor and Storage 74HC138D

Part No.:: 74HC138D

Manufacturer:: Toshiba Semiconductor and Storage

Package:: 16-SOIC (0.154, 3.90mm Width)

Datasheet:: 74HC138D.pdf

Description:: IC DECODER 1 X 3:8 16SOIC

In Stock:: 301

Quantity:: Add To Cart

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74HC138D Specifications

Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®
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 ~ 125°C
MountingType:
Surface Mount

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74HC138D information

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74HC138D Typical application Circuitry

74HC138D

A high-speed Si-gate CMOS device, the 74HC138D is a member of the 74HC series. It functions essentially as a 3-to-8 line decoder/demultiplexer and can decode three binary-coded inputs into one of eight mutually exclusive outputs thanks to its design.

Functional Characteristics of 74HC138D:

- 3-to-8 Line Decoder/Demultiplexer: The primary function of the 74HC138D is to convert a 3-bit binary input into one active low output among eight.

- Three Enable Inputs: There are three enable inputs that must be set correctly for the decoder to function.

- High Noise Immunity: The chip embodies the characteristics of the CMOS family by offering a high degree of noise immunity.

Application Scenarios:

- Memory Address Decoding: Primarily in computer systems to select a specific memory location based on the address provided.

- Multiplexing: Converting multiple inputs into a single output line, especially in data routing applications.

- Control Applications: Activating a particular device out of multiple devices based on the input conditions.

Memory Address Decoding Using 74HC138D:

To demonstrate its application, consider using the 74HC138D as an address decoder in a memory system:

1. Power Connections:

- VCC (Pin 16): Connect to the positive supply voltage, typically +5V.

- GND (Pin 8): Connect to the system ground.

2. Address Inputs:

- A0 (Pin 1), A1 (Pin 2), and A2 (Pin 3): These pins are the three address inputs. Connect them to the three address lines from which you wish to decode.

3. Enable Inputs:

- E1 (Pin 4) and E2 (Pin 5): Both are active HIGH enable inputs. Connect them to GND to enable the decoding operation.

- E3 (Pin 6): It's an active LOW enable input. Connect this to VCC to activate the chip.

4. Outputs:

- Y0 to Y7 (Pins 15 to 9 and 7 to 10 respectively): These are the eight outputs. Each output goes LOW based on the address input when decoding. For example, when A0, A1, and A2 are LOW, Y0 will go LOW, and the rest will remain HIGH.

5. Memory Modules:

- Connect each of the 74HC138D output pins (Y0 to Y7) to the enable or chip select input of the respective memory module.

Design Considerations:

- Input Noise: Given its high noise immunity, the 74HC138D works well in noisy environments. Yet, always ensure the inputs are clean to prevent erroneous outputs.

- Propagation Delays: Delays can occur from the time of the address input change to the output change, affecting system timing.

- Power Decoupling: Incorporate a decoupling capacitor close to the IC between VCC and GND to minimize voltage transients.

- Enable Line Logic: Ensure the enable lines are correctly configured for the chip to function.

In wrapping up, the 74HC138D stands out as a quintessential component for address decoding and multiplexing applications in various digital systems. Designers often prefer it for its reliability, ease of use, and adaptability in complex circuits.

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6. What is the process for return or replacement of 74HC138D?

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 74HC138D we delivered, we will accept the replacement or return of the 74HC138D 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 74HC138D.

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

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(1)Inform us within 90 days

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