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What is the difference between level-shifting bus switches and bus buffers?
A bus switch uses a MOSFET as a switch and pull-up resistors to level-shift the High-level voltage.
Being a simple switch, the bus switch does not provide any current drive capability.
The following describes the operation of a bus switch. Suppose that a signal is applied to input A.
When a voltage equal to or higher than VIH is applied to the Output Enable (OE) input, the bus switch transfers the input signal (High or Low) to the output.
The signal transfer operations depend on whether the input voltage is higher than the VOHU (input/output characteristics for up translation) specified in the datasheet.
- ０V ≤ input voltage < VOHU: The internal switch is on and transfers a signal from A to B without changing its voltage.
- Input voltage ≥ VOHU: The internal switch is off. The external pull-up resistor on the VCCB side pulls up the input voltage to the VCCB level.
In this way, the input signal is level-shifted and transferred to the output.
VOHU and VOHD characteristics shown in the datasheet ( TC7SPB9306TU )
Note 1: The Input/Output Characateristics for up translation indicate the input voltages required to provide. VCCA + 0.5 V on the outputs when measured using the test circuitry shown in Figure 7.
Note 2: The Input/Output Characateristics for down translation indicate the voltages that cause the output voltages to saturate when measured using the test circuitry shown in Figure 9.
A bus buffer uses a CMOS circuit for level-shifting. Therefore, it has an inherent drive capability and provides a digital output. For the drive capability, see the output current value shown in the Operating Ranges table in the datasheet.
The following documents also contain related information:
Application notes
Glossary of CMOS Logic ICs
Basics of CMOS Logic Ics
CMOS Logic ICs Selection Guide
CMOS Logic ICs Usage Considerations
Basics of Bus Switches
Applications of Low-Voltage One-Gate Logic ICs to Level Shift Circuits
FAQ
Product lists
Dual-Supply Bus Switches
Dual Supply Bus Buffer
Single Supply Bus Buffer
Product web page