TC7MPB9326FK(EL)

Overview

The TC7MPB9326FK(EL) is a CMOS digital bus switch IC featuring dual SPDT multiplexer/demultiplexer circuits. It supports independent power supplies with VCCA ranging from 1.65 V to 5.0 V and VCCB from 2.3 V to 5.5 V. The device provides bidirectional level shifting between different voltage nodes. Key electrical parameters include a maximum ON-resistance of 16 Ω, a maximum propagation delay of 1.2 ns, and a maximum quiescent supply current of 4 μA. It operates within a temperature range of -40 °C to +85 °C and is housed in a VSSOP-14 package.

Feature Summary

• Dual SPDT multiplexer/demultiplexer architecture enabling flexible signal routing between two independent voltage domains.
• Bidirectional level-shifting capability for interfacing nodes operating at different logic voltage levels.
• Power-down protection on control inputs ensuring isolation when the device is unpowered.
• High electrostatic discharge tolerance providing robustness against machine and human body model events.

Applications

• Interfacing low-voltage processors with higher-voltage peripheral buses
• Bidirectional translation between mixed-signal system nodes
• Isolating bus lines via output enable control

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the base part number covers multiple configurations. Confirm RoHS compliance status directly with the manufacturer or authorized distributor documentation before finalizing procurement. Ensure the selected variant aligns with the intended voltage domain requirements and thermal management specifications for the target application environment.

Selection Notes

Select this component when designing interfaces between systems requiring distinct power rails, specifically where VCCA must remain lower than VCCB. Consider the maximum ON-resistance and propagation delay limits to ensure signal integrity meets system timing requirements. Verify that the control input voltage tolerances align with the driving logic levels to prevent damage during operation.

Part Context

This device belongs to the TC7MPB932x series of low-voltage, low-power dual-supply bus switches manufactured by Toshiba Semiconductor and Storage. The series includes variants such as the TC7MPB9327, which differs primarily in the active state polarity of its output enable pin. These components are designed for applications requiring efficient voltage translation and bus isolation in compact surface-mount packages.

Replacement Considerations

The TC7MPB9327FT/FK serves as a functional alternative within the same family, distinguished by an active-low Output Enable pin compared to the active-high configuration of the TC7MPB9326. Both share identical electrical characteristics and pinouts, allowing for potential substitution if control logic polarity can be adjusted accordingly.

FAQ

How does the TC7MPB9326 achieve bidirectional level shifting?

It utilizes external pull-up resistors connected between the data lines and the respective VCCA or VCCB supplies, allowing signals to pass freely between the two independent voltage domains without restriction on relative magnitude.

What is the function of the Output Enable (OE) pin?

The OE pin controls the state of the internal switches; for the TC7MPB9326, a high signal turns the switch on, while a low signal disconnects the bus lines, effectively isolating them.