SN74HCT645N

Product Overview

Category

SN74HCT645N belongs to the category of integrated circuits (ICs).

Use

It is commonly used as a bidirectional octal bus transceiver.

Characteristics

• High-speed CMOS technology
• 8-bit wide bidirectional bus interface
• Voltage-level translation between 5V and 3.3V systems
• Non-inverting outputs for easy cascading
• Schmitt-trigger inputs for noise immunity

Package

SN74HCT645N is available in a 20-pin DIP (Dual Inline Package) format.

Essence

The essence of SN74HCT645N lies in its ability to facilitate bidirectional communication between two buses with different voltage levels.

Packaging/Quantity

SN74HCT645N is typically packaged in tubes or reels, with quantities varying based on customer requirements.

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 12 ns (max)
• Output Current: ±6 mA

Detailed Pin Configuration

1. A1: Bus A, Bit 1
2. A2: Bus A, Bit 2
3. A3: Bus A, Bit 3
4. A4: Bus A, Bit 4
5. A5: Bus A, Bit 5
6. A6: Bus A, Bit 6
7. A7: Bus A, Bit 7
8. A8: Bus A, Bit 8
9. GND: Ground
10. B8: Bus B, Bit 8
11. B7: Bus B, Bit 7
12. B6: Bus B, Bit 6
13. B5: Bus B, Bit 5
14. B4: Bus B, Bit 4
15. B3: Bus B, Bit 3
16. B2: Bus B, Bit 2
17. B1: Bus B, Bit 1
18. OE: Output Enable
19. DIR: Direction Control
20. VCC: Supply Voltage

Functional Features

• Bidirectional data transfer between two buses
• Voltage-level translation for compatibility between different systems
• Non-inverting outputs allow easy cascading of multiple devices
• Schmitt-trigger inputs provide noise immunity and signal conditioning

Advantages and Disadvantages

Advantages

• High-speed operation
• Wide voltage range support
• Noise-immune inputs
• Easy cascading capability

Disadvantages

• Limited output current capacity
• Requires external control signals for direction and enable

Working Principles

SN74HCT645N operates by receiving data from one bus (A) and transmitting it to another bus (B), or vice versa. The direction of data flow is controlled by the DIR pin. When DIR is high, data flows from A to B, and when DIR is low, data flows from B to A. The OE pin enables or disables the outputs.

Detailed Application Field Plans

SN74HCT645N finds applications in various fields, including: 1. Microcontroller interfacing 2. Data communication systems 3. Industrial automation 4. Embedded systems 5. Networking equipment

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to SN74HCT645N are: 1. 74HC245 2. CD74HCT245E 3. MC74HCT245AN 4. SN74HCT245N 5. 74HCT245D

These models offer comparable features and can be used as substitutes based on specific requirements.

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