SN74CBTR16861DGGR

Overview

The SN74CBTR16861DGGR is a 20-bit FET bus switch from the Widebus family, organized as two independent 10-bit switches. It operates on a single supply voltage ranging from 4 V to 5.5 V and supports an operating temperature range of -40°C to 85°C. The device features TTL-compatible input levels and includes equivalent 25-Ω series resistors to reduce signal reflection noise. Electrical characteristics specify a typical on-state resistance (ron) of 33 Ω at VCC = 4.5 V with II = 30 mA, and a maximum propagation delay (tpd) of 1.25 ns at VCC = 5 V.

Feature Summary

• Provides high-speed bus switching with low on-state resistance for minimal propagation delay.
• Integrates equivalent 25-Ω series resistors to eliminate the need for external terminating resistors.
• Features separate output-enable inputs for independent control of each 10-bit switch section.

Applications

• High-speed data bus routing
• Signal path switching in digital systems
• Bus isolation applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure correct package type and tape-and-reel specifications. Confirm that the component status remains active for new designs by checking the latest production data release. Ensure compatibility with the required supply voltage and thermal operating conditions before finalizing procurement.

Selection Notes

Select this component when a 20-bit bidirectional bus switch is required within a 4 V to 5.5 V supply range. The integrated 25-Ω resistors make it suitable for applications needing reduced signal reflections without external components. Verify that the 48-pin TSSOP package dimensions fit the available PCB footprint and that the TTL-compatible input thresholds align with the system logic levels.

Part Context

This device belongs to Texas Instruments' Widebus family, designed for high-density bus switching applications. It utilizes FET technology to achieve low on-resistance and fast switching speeds. The SN74CBTR16861DGGR variant specifically denotes the 48-pin TSSOP package configuration supplied in a tape-and-reel format for automated assembly processes.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.

FAQ

How does the device handle signal reflection?

The device incorporates equivalent 25-Ω series resistors internally to reduce signal-reflection noise, which eliminates the requirement for external terminating resistors.

What is the control logic for enabling the switch?

When the output-enable (OE) input is low, the switch connects port A to port B. When OE is high, the switch disconnects, placing the ports in a high-impedance state.