MC74VHC244DWR2G

Product Overview

• Category: Integrated Circuit
• Use: Buffer/Line Driver
• Characteristics: High-Speed, Low Power, Non-Inverting, 3-State Output
• Package: SOIC-20
• Essence: The MC74VHC244DWR2G is a high-speed buffer/line driver integrated circuit designed for general-purpose logic-level translation applications.
• Packaging/Quantity: The MC74VHC244DWR2G is available in tape and reel packaging with 2500 units per reel.

Specifications

• Supply Voltage: 2.0V to 5.5V
• Input Voltage: -0.5V to VCC + 0.5V
• Output Voltage: -0.5V to VCC + 0.5V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 4.3ns (typical)
• Output Drive Capability: ±8mA

Pin Configuration

The MC74VHC244DWR2G has a total of 20 pins arranged as follows:

__ __ A1 | 1 20 | VCC A2 | 2 19 | OE# B1 | 3 18 | I/O1 B2 | 4 17 | I/O2 C1 | 5 16 | I/O3 C2 | 6 15 | I/O4 D1 | 7 14 | I/O5 D2 | 8 13 | I/O6 GND | 9 12 | I/O7 Y1 |10 11 | I/O8 ‾‾ ‾‾

Functional Features

• High-Speed Operation: The MC74VHC244DWR2G offers fast propagation delay, making it suitable for high-speed applications.
• Non-Inverting Buffer: The device provides non-inverting logic-level translation, maintaining the same logic state between input and output.
• 3-State Output: The output pins can be put into a high-impedance state using the OE# (Output Enable) pin, allowing multiple devices to share a common bus.

Advantages and Disadvantages

Advantages

• High-Speed operation enables efficient data transfer in time-critical applications.
• Non-inverting buffer simplifies logic-level translation without changing the logic state.
• 3-State output allows for bus sharing and reduces conflicts in multi-device systems.

Disadvantages

• Limited output drive capability may not be suitable for driving heavy loads.
• Requires an external control signal (OE#) to enable/disable the output.

Working Principles

The MC74VHC244DWR2G operates by receiving digital input signals on its eight input pins (A1-A2, B1-B2, C1-C2, D1-D2). These input signals are then buffered and amplified internally. The resulting output signals are available on the eight corresponding output pins (Y1-Y8).

The OE# pin controls the output state of the device. When OE# is low (active), the outputs are enabled and reflect the input signals. When OE# is high (inactive), the outputs are in a high-impedance state, effectively disconnecting them from the circuit.

Detailed Application Field Plans

The MC74VHC244DWR2G is commonly used in various applications, including:

1. Data Communication Systems: It can be used for level shifting and buffering in serial communication interfaces like UART, SPI, and I2C.
2. Memory Systems: The device can be employed for address and data bus buffering in memory modules such as RAM and ROM.
3. Microcontroller Interfacing: It facilitates logic-level translation between microcontrollers and peripheral devices.

Detailed and Complete Alternative Models

1. SN74LV244A: Low-Voltage Octal Buffer/Line Driver
2. CD74HCT244: High-Speed CMOS Logic Octal Buffer/Line Driver
3. 74HC244: High-Speed CMOS Logic Octal Buffer/Line Driver

These alternative models offer similar functionality to the MC74VHC244DWR2G and can be considered as replacements based on specific requirements.

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