SN74LS245DBRG4

The SN74LS245DBRG4 is a high-speed, low-power, octal transceiver designed for data communication between two buses. Manufactured by Texas Instruments, this device is part of the 74LS (Low Power Schottky) series, which is known for its fast switching times and low power consumption.

Key Features:

1. Functionality: The SN74LS245 is an octal transceiver, meaning it can transmit and receive data on eight lines. It is designed to facilitate bidirectional data flow, allowing for communication between two different buses.

2. Data Direction Control: The device includes a direction control pin (DIR) that determines the direction of data flow. When DIR is high, data flows from the A bus to the B bus; when DIR is low, data flows from the B bus to the A bus.

3. Enable Control: The transceiver features an active-low enable pin (OE) that allows the device to be placed in a high-impedance state, effectively disconnecting it from the bus. This feature is useful for bus arbitration and allows multiple devices to share the same bus without interference.

4. Voltage Levels: The SN74LS245 operates with a supply voltage (Vcc) typically ranging from 4.75V to 5.25V, making it compatible with standard TTL logic levels.

5. Speed: The device boasts a propagation delay of approximately 10 ns, allowing for high-speed data transmission, which is essential in modern digital circuits.

6. Package Type: The SN74LS245DBRG4 is housed in a 20-pin TSSOP (Thin Shrink Small Outline Package) form factor, which is compact and suitable for space-constrained applications. The "G4" suffix indicates that the part is lead-free and compliant with RoHS standards.

7. Temperature Range: The device is rated for operation over a temperature range of -40°C to +85°C, making it suitable for industrial and automotive applications.

8. Applications: Common applications for the SN74LS245 include data bus buffering, interfacing between different logic families, and communication in microprocessor systems.

Electrical Characteristics:

• Input Voltage Levels: The input high voltage (VIH) is typically 2.0V minimum, while the input low voltage (VIL) is 0.8V maximum.
• Output Voltage Levels: The output high voltage (VOH) is typically 2.7V minimum at a load of 15 mA, and the output low voltage (VOL) is typically 0.5V maximum at the same load.
• Power Dissipation: The typical power dissipation is low, making it suitable for battery-operated devices.

Conclusion:

The SN74LS245DBRG4 is a versatile and efficient octal transceiver that plays a crucial role in digital communication systems. Its combination of high-speed performance, low power consumption, and robust features makes it an ideal choice for a wide range of applications in modern electronics.