SN74LS641NG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Bus Transceiver
• Characteristics:
  • High-speed TTL compatible
  • Bidirectional data transfer
  • Non-inverting outputs
  • 3-state outputs
• Package: DIP-20 (Dual In-line Package with 20 pins)
• Essence: The SN74LS641NG4 is a high-speed, non-inverting, bidirectional data bus transceiver designed for use in various digital systems.
• Packaging/Quantity: Available in tubes or reels, quantity depends on the supplier.

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• Input Voltage Range: 0V to 7V
• Output Voltage Range: 0V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Maximum Propagation Delay: 10ns
• Maximum Output Current: ±24mA

Detailed Pin Configuration

The SN74LS641NG4 has a total of 20 pins arranged as follows:

+---+--+---+ A1 -|1 +--+ 20|- VCC B1 -|2 |- B2 A2 -|3 |- B3 B3 -|4 |- A3 A3 -|5 |- B4 B4 -|6 |- A4 A4 -|7 |- B5 B5 -|8 |- A5 A5 -|9 |- B6 B6 -|10 |- A6 A6 -|11 |- B7 B7 -|12 |- A7 A7 -|13 |- B8 B8 -|14 |- A8 GND -|15 |- B9 OE -|16 |- A9 DIRB -|17 |- B10 DIRA -|18 |- A10 A10-|19 |- B11 B11-|20 |- A11 +----------+

Functional Features

• Bidirectional Data Transfer: The SN74LS641NG4 allows data to be transferred bidirectionally between two buses.
• Non-Inverting Outputs: The outputs of the transceiver are non-inverting, maintaining the same logic level as the inputs.
• 3-State Outputs: The transceiver has 3-state outputs, allowing the bus to be effectively disconnected when not in use.

Advantages and Disadvantages

Advantages: - High-speed operation - TTL compatibility - Non-inverting outputs

Disadvantages: - Limited voltage range (0V to 5.25V) - Requires external pull-up resistors for proper operation

Working Principles

The SN74LS641NG4 operates by using a combination of control signals (DIRA, DIRB, and OE) to determine the direction of data transfer and enable/disable the outputs. When DIRA is high and DIRB is low, data is transferred from Bus A to Bus B. Conversely, when DIRA is low and DIRB is high, data is transferred from Bus B to Bus A. The OE signal is used to enable or disable the outputs.

Detailed Application Field Plans

The SN74LS641NG4 can be used in various digital systems where bidirectional data transfer is required. Some potential application fields include:

1. Microprocessor Systems: The transceiver can be used to interface the microprocessor's data bus with other peripherals or memory modules.
2. Communication Systems: It can be used in communication systems to facilitate data exchange between different modules or devices.
3. Industrial Control Systems: The transceiver can be utilized in industrial control systems for data transfer between various control units.

Detailed and Complete Alternative Models

1. SN74LS245N: Octal Bus Transceiver with 3-State Outputs
2. SN74HCT640N: Octal Bus Transceiver with Inverting Outputs
3. SN74LVC4245APW: Octal Dual Supply Bus Transceiver with 3-State Outputs

These alternative models offer similar functionality to the SN74LS641NG4 and can be considered as alternatives based on specific requirements.

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