CD74AC623M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data storage and retrieval
• Characteristics: High-speed, low-power consumption
• Package: 20-pin SOIC (Small Outline Integrated Circuit)
• Essence: A dual octal bus transceiver with 3-state outputs
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage: 2V to 6V
• Operating Temperature: -40°C to +85°C
• Input/Output Compatibility: TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) levels
• Propagation Delay: 5.5ns (typical)
• Output Drive Capability: ±24mA

Detailed Pin Configuration

The CD74AC623M has a total of 20 pins, which are assigned as follows:

1. GND (Ground)
2. B0 (Bus B, Bit 0)
3. B1 (Bus B, Bit 1)
4. B2 (Bus B, Bit 2)
5. B3 (Bus B, Bit 3)
6. B4 (Bus B, Bit 4)
7. B5 (Bus B, Bit 5)
8. B6 (Bus B, Bit 6)
9. B7 (Bus B, Bit 7)
10. OE (Output Enable)
11. DIR (Direction Control)
12. A7 (Bus A, Bit 7)
13. A6 (Bus A, Bit 6)
14. A5 (Bus A, Bit 5)
15. A4 (Bus A, Bit 4)
16. A3 (Bus A, Bit 3)
17. A2 (Bus A, Bit 2)
18. A1 (Bus A, Bit 1)
19. A0 (Bus A, Bit 0)
20. VCC (Supply Voltage)

Functional Features

• Bidirectional data transfer between two independent buses (A and B)
• 3-state outputs allow multiple devices to share the same bus
• Output enable and direction control for flexible operation
• High-speed operation suitable for time-critical applications
• Low power consumption for energy-efficient designs

Advantages and Disadvantages

Advantages

• Fast data transfer with low propagation delay
• Wide supply voltage range allows compatibility with various systems
• Can be used in both TTL and CMOS environments
• Enables efficient sharing of data buses among multiple devices

Disadvantages

• Limited output drive capability compared to some other ICs
• Requires careful consideration of bus contention issues during design

Working Principles

The CD74AC623M is designed to facilitate bidirectional data transfer between two separate buses. The direction of data flow is controlled by the DIR pin. When DIR is high, data is transferred from Bus A to Bus B, and when DIR is low, data flows from Bus B to Bus A.

The OE pin enables or disables the outputs of the transceiver. When OE is high, the outputs are in a high-impedance state (3-state), allowing other devices to drive the bus. When OE is low, the outputs actively drive the bus.

Detailed Application Field Plans

The CD74AC623M can be utilized in various applications that require bidirectional data transfer between two buses. Some potential application fields include:

1. Microprocessor-based systems
2. Data communication equipment
3. Industrial automation
4. Automotive electronics
5. Test and measurement instruments

Detailed and Complete Alternative Models

1. SN74AC623: Similar functionality, available in different package options
2. CD74ACT623: Higher output drive capability, compatible with TTL and CMOS levels
3. MC74AC623: Enhanced ESD (Electrostatic Discharge) protection, suitable for rugged environments

These alternative models offer similar functionality to the CD74AC623M but may have different characteristics or package options to suit specific design requirements.

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