SN74LS245DBRG4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS245DBRG4 is an octal bus transceiver utilizing Schottky transistor logic, housed in a 20-pin SSOP package. It supports bidirectional data transmission between A and B buses controlled by the DIR input, with an active-low OE pin for high-impedance isolation. Operating at a nominal 5 V supply (4.75 V to 5.25 V), it features 3-state outputs capable of sinking 24 mA and sourcing -15 mA. The device provides typical propagation delays of 8 ns and includes hysteresis on bus inputs to enhance noise margins.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Schottky transistor logic technology enables standard '245 functionality with reduced DC loading via PNP inputs.
• Built-in hysteresis on bus inputs improves noise margins for reliable asynchronous communication.
• Active-low output enable isolates buses effectively when disabled, preventing signal contention.

Buffers, Drivers, Receivers, Transceivers Applications

• Building automation systems
• Electronic point of sale terminals
• Factory automation and control networks
• Test and measurement equipment

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm lead finish, moisture sensitivity level, and environmental compliance status. Ensure the selected variant matches the required operating temperature range and packaging format for your assembly process.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring robust drive strength on ribbon cables or backplane buses where standard logic may be insufficient. Consider the thermal resistance characteristics of the SSOP package and ensure adequate bypass capacitance near the power pins to maintain signal integrity during switching.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SNx4LS245 family of octal bus transceivers with 3-state outputs. It shares common pinouts and direction control logic with other variants in the series, facilitating design scalability across different logic families while maintaining functional compatibility for bus interfacing applications.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS245DWR

Buffers, Drivers, Receivers, Transceivers FAQ

How does the device handle unused channels?

Unused channels must be terminated properly to prevent floating inputs. Both sides of an unused channel should be tied to the same logic level, such as ground or VCC, to ensure stable operation.

What is the function of the DIR pin?

The DIR pin controls the direction of data flow. A low level directs data from the B bus to the A bus, while a high level directs data from the A bus to the B bus.