74LVC138AD/AUJ

Product Overview

• Category: Integrated Circuit
• Use: Decoding/Demultiplexing
• Characteristics: Low voltage, high-speed CMOS device
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: 3-to-8 line decoder/demultiplexer
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 1.65V to 5.5V
• High-Speed CMOS: tPD = 4.2 ns (typ) at 5V VCC
• Low Power Dissipation: ICC = 4 µA (max) at 5V VCC
• Output Drive Capability: 15 LSTTL Loads
• Balanced Propagation Delays: tPLH = tPHL
• Wide Operating Temperature Range: -40°C to +125°C
• Input Clamp Diodes Limit High-Speed Termination Effects

Detailed Pin Configuration

• Pin 1: Y0 (Output 0)
• Pin 2: Y1 (Output 1)
• Pin 3: GND (Ground)
• Pin 4: A0 (Address Input 0)
• Pin 5: A1 (Address Input 1)
• Pin 6: E1 (Enable Input 1)
• Pin 7: E2 (Enable Input 2)
• Pin 8: VCC (Supply Voltage)
• Pin 9: Y2 (Output 2)
• Pin 10: Y3 (Output 3)
• Pin 11: A2 (Address Input 2)
• Pin 12: A3 (Address Input 3)
• Pin 13: Y4 (Output 4)
• Pin 14: Y5 (Output 5)
• Pin 15: Y6 (Output 6)
• Pin 16: Y7 (Output 7)

Functional Features

• Decodes Three Binary Coded Inputs to Eight Outputs
• Active LOW Enable Inputs for Easy Expansion
• Ideal for Address Decoding in Microprocessor Systems
• Can Drive Up to 15 LSTTL Loads

Advantages and Disadvantages

Advantages

• Wide operating voltage range
• Low power dissipation
• Balanced propagation delays
• Can drive multiple loads

Disadvantages

• Limited output drive capability compared to some alternatives
• Requires careful consideration of input signal levels

Working Principles

The 74LVC138AD/AUJ is a 3-to-8 line decoder/demultiplexer that decodes three binary address inputs (A0, A1, A2) into eight mutually exclusive outputs (Y0 to Y7). The device features active LOW enable inputs (E1, E2) which can be used to expand the decoder to larger systems.

Detailed Application Field Plans

The 74LVC138AD/AUJ is commonly used in microprocessor systems for address decoding, memory selection, and peripheral control. It is also utilized in various digital systems for data demultiplexing and signal routing.

Detailed and Complete Alternative Models

• 74HC138: Similar functionality but operates at higher voltage levels
• 74LS138: Operates at lower speed but with higher output drive capability
• SN74LVC139A: Dual 2-to-4 line decoder/demultiplexer with similar characteristics

In conclusion, the 74LVC138AD/AUJ is a versatile and efficient decoder/demultiplexer suitable for a wide range of digital applications, offering a balance of performance, power consumption, and flexibility.

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