SN74CBT3245APWRG4

Overview

The SN74CBT3245APWRG4 is an octal FET bus switch manufactured by Texas Instruments. It provides eight bits of high-speed TTL-compatible bus switching within a single circuit. The device operates at a supply voltage range of 4 V to 5.5 V and features a standard '245-type pinout in a 20-pin TSSOP package. Key electrical characteristics include a maximum on-state resistance of 7 Ω, a propagation delay of 0.25 ns at 5 V, and continuous channel current capability of 128 mA. It supports bidirectional data transfer between Port A and Port B controlled by the OE input.

Feature Summary

• Provides eight bits of high-speed TTL-compatible bus switching
• Features low on-state resistance for minimal propagation delay
• Ensures high-impedance state during power-up or power-down via OE control

Applications

• High-speed data bus switching applications
• Portable systems requiring low power consumption
• Battery-powered consumer electronics

Procurement Notes

Verify that the ordering suffix APWRG4 corresponds to the specific tape and reel packaging configuration and lead-free status required for your assembly process. Confirm the component matches the active production status listed in the datasheet. Ensure compatibility with the specified operating temperature range and voltage levels before finalizing procurement orders.

Selection Notes

Select this component when an octal bidirectional bus switch with TTL-compatible inputs is required. It is suitable for designs needing a standard '245 pinout in a compact surface-mount package. Consider the 4 V to 5.5 V supply voltage range and the low on-resistance characteristics for signal integrity requirements in portable or battery-operated equipment.

Part Context

This part belongs to the SN74CBT3245A family of octal FET bus switches from Texas Instruments. The family offers various package options including SOIC, SSOP, TVSOP, and VQFN. The SN74CBT3245APWRG4 specifically utilizes the TSSOP package with tape and reel packaging, designed for automated surface-mount assembly processes.

Replacement Considerations

SN74CBT3245APW

FAQ

How does the OE input control the switch state?

When the output-enable (OE) input is low, the switch is on, connecting Port A to Port B. When OE is high, the switch is open, creating a high-impedance state between the two ports.

What is the recommended method to ensure high-impedance during power-down?

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor. The minimum value of the resistor is determined by the current-sinking capability of the driver.