SN74AHCT245PWRE4

Product Overview

• Category: Integrated Circuit
• Use: Level Shifter/Transceiver
• Characteristics: High-Speed, Non-Inverting, Bidirectional
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: Logic Level Translator
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Input Voltage Range: 0 V to VCC
• Output Voltage Range: 0 V to VCC
• Maximum Operating Frequency: 74 MHz
• Number of Channels: 8
• Input/Output Type: Tri-State
• Propagation Delay Time: 7 ns (typical)
• Low Power Consumption: ICC = 4 µA (max)

Detailed Pin Configuration

The SN74AHCT245PWRE4 has a total of 20 pins, which are assigned as follows:

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

Functional Features

• Bidirectional Level Shifting: Allows for seamless translation between different logic voltage levels.
• Non-Inverting: The input and output signals have the same logic polarity.
• Tri-State Outputs: The outputs can be disabled to enter a high-impedance state, allowing multiple devices to share a common bus.

Advantages and Disadvantages

Advantages: - High-Speed Operation: Supports data rates up to 74 MHz, making it suitable for applications requiring fast signal transmission. - Wide Supply Voltage Range: Can operate with supply voltages ranging from 2 V to 5.5 V, providing flexibility in various systems. - Low Power Consumption: Consumes only 4 µA of current, minimizing power usage and extending battery life in portable devices.

Disadvantages: - Limited Number of Channels: The SN74AHCT245PWRE4 has 8 channels, which may not be sufficient for applications requiring a higher number of data lines. - Propagation Delay: The propagation delay time of 7 ns (typical) may introduce slight delays in signal transmission.

Working Principles

The SN74AHCT245PWRE4 is designed to translate logic level signals between two voltage domains. It uses a combination of CMOS and TTL technologies to achieve bidirectional level shifting. The DIR pin controls the direction of data flow, while the OE pin enables or disables the outputs. When the OE pin is low, the outputs are active, and when it is high, the outputs enter a high-impedance state.

Detailed Application Field Plans

The SN74AHCT245PWRE4 is commonly used in various applications, including:

1. Microcontroller Interfacing: It facilitates communication between microcontrollers operating at different logic voltage levels.
2. Bus Transceivers: It enables bidirectional data transfer between buses with different voltage requirements.
3. Level Shifting: It converts logic signals from one voltage level to another, ensuring compatibility between different integrated circuits.

Detailed and Complete Alternative Models

1. SN74AHCT244PWRE4: Octal Buffer/Line Driver with 3-State Outputs
2. SN74LVC245APWRE4: Octal Bus Transceiver with 3-State Outputs
3. SN74LVCH245APWRE4: Octal Bus Transceiver with 3-State Outputs

These alternative models offer similar functionality and can be used as substitutes for the SN74AHCT245PWRE4 in various applications.

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