CD74HC245M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Level shifting and signal buffering
• Characteristics: High-speed, CMOS technology, 3-state outputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Transceiver
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature: -40°C to +85°C
• Propagation Delay: 9 ns (typical)
• Output Current: ±6 mA
• Number of Pins: 20

Pin Configuration

The CD74HC245M has a total of 20 pins. The pin configuration is as follows:

1. A1
2. B1
3. A2
4. B2
5. A3
6. B3
7. A4
8. B4
9. GND
10. OE (Output Enable)
11. DIR (Direction Control)
12. NC (No Connection)
13. B7
14. A7
15. B6
16. A6
17. B5
18. A5
19. VCC
20. Y

Functional Features

• Bidirectional data transfer between two buses
• 3-state outputs for bus isolation
• Non-inverting level shifting
• High-speed operation
• CMOS technology for low power consumption

Advantages and Disadvantages

Advantages

• Fast propagation delay allows for high-speed data transfer
• CMOS technology ensures low power consumption
• 3-state outputs provide bus isolation capability
• Wide operating voltage range (2V to 6V)
• Compact SOIC package for space-saving designs

Disadvantages

• Limited output current capacity (±6 mA)
• Not suitable for high-power applications
• Requires external control signals for direction and output enable

Working Principles

The CD74HC245M is a bidirectional transceiver IC that allows for the transfer of data between two buses. It operates using CMOS technology, which ensures low power consumption. The direction of data flow is controlled by the DIR pin, while the OE pin enables or disables the outputs.

When the DIR pin is set to logic high, data is transferred from the A bus to the B bus. Conversely, when the DIR pin is set to logic low, data is transferred from the B bus to the A bus. The OE pin is used to enable or disable the outputs. When the OE pin is set to logic high, the outputs are enabled, allowing data to be transferred. When the OE pin is set to logic low, the outputs are disabled, effectively isolating the two buses.

Detailed Application Field Plans

The CD74HC245M is commonly used in various applications where level shifting and signal buffering are required. Some of the typical application fields include:

1. Microcontroller interfacing
2. Data communication systems
3. Industrial automation
4. Automotive electronics
5. Robotics
6. Test and measurement equipment

Detailed and Complete Alternative Models

1. SN74HCT245N: Similar functionality with TTL compatibility
2. MC74LVX245D: Low-voltage operation (1.65V to 5.5V)
3. CD74ACT245E: Higher output current capacity (±24 mA)

These alternative models offer similar functionality to the CD74HC245M but may have different characteristics or specifications that suit specific application requirements.

In conclusion, the CD74HC245M is a high-speed CMOS transceiver IC used for level shifting and signal buffering. It offers bidirectional data transfer, 3-state outputs, and operates within a wide voltage range. While it has advantages such as low power consumption and compact packaging, it also has limitations in terms of output current capacity. The IC finds applications in various fields such as microcontroller interfacing, data communication systems, and industrial automation. Alternative models with different characteristics are available to cater to specific needs.