Part Number Search

Cross Reference Search

About information presented in this cross reference

The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.

Keyword Search

Parametric Search

Stock Check & Purchase

Select Product Categories

Is it necessary to add an external pullup resistor between the input or output pins of a dual power level shift bus switch type and the power supply(VCCA or VCCB)?

Figure 1 When Using Bi-directional Level Conversion
Figure 1 When Using Bi-directional Level Conversion

A dual power bus switch has the feature that the switch is turned off when the input signal of terminal A (or terminal B) exceeds the reference voltage based on VCCA.
This feature is used for voltage level shifting (level shifting).
Therefore, a pull-up resistor is not required on the input side of the signal, and it is necessary to pull up on the output side to the power supply on the output side.
When using in both directions (Fig. 1), a pull-up resistor (Rpullup-A, Rpullup-B) is required at both pins because both A and B sides may be output.
When using the input side and output side in one direction (Fig. 2), a pull-up resistor is not required at the input terminal (A side), but the output terminal (B side) must be pulled up (Rpullup-B) to the power VCCB at the output side.
When using in one direction in the reverse direction, a pull-up resistor is not required for the input pin (B side), but it is required to pull up (Rpullup-A) the output pin (A side) to the power VCCA of the output side.

Fig. 2 When using with one-way level conversion
Fig. 2 When using with one-way level conversion
A new window will open