Low-voltage, low-capacitance switches deliver high-speed bidirectional bus switching

Following the demand to lower capacitive and resistive circuit components to support increased signal speeds the TC7MBL/WBL/SBLxxxxC series has been fabricated using a proprietary process that ensures a reduced I/O terminal capacitance (CI/O) when compared to previous bus switches. The reduced capacitance results in short transition times. For the TC7MBL3245C, for example, a typical capacitance as low as 5pF, is 75% lower than the typical CI/O ON-capacitance of previous switches. Typical ON resistance with a 3V input voltage is just 6.5Ω. In addition to the maximum quiescent supply current of only 10µA this switch series does not require a direction control signal to support bidirectional data transfer.

The new family offers SPST, SPDT and SP4T switch configurations. SPST versions are available in single-, 2-, 4- and 8-bit options, while SPDT and SP4T configurations are supplied as 4-bit and 2-bit respectively. The switches come with an output enable (OE) pin to completely isolate A- and B-sides. For SPDT and SP4T configurations each switch is equipped with additional select pins for input/output configuration.

Depending on the device chosen this switch series comes in a wide variety of package options, ranging from SOT-353 size through TSSOP and VSSOP to Toshiba’s VQON package.