1. Related concepts

VOH: Output high voltage level range - related to the output current (usually given Min to VCCA/B)

VOL: Output low voltage level range (usually given 0V to MAX value)

RS010x: Automatic bidirectional level converter with on-drain (2Mbps) and push-pull (24Mbps) outputs

RS020x: Automatic bidirectional level converter with push-pull (100Mbps) output only

Open-drain output: the open-drain output here refers to the output mode of the output outlet of the chip (main control and peripheral) at both ends of the level conversion IC, that is, only the NMOS tube needs to be added with a pull resistor at the output outlet of the main control and peripheral.

Push-pull output: The push-pull output here refers to the output mode of the output outlet of the chip (master and peripheral) at both ends of the level conversion IC, that is, the output outlet of the master and peripheral is a CMOS tube.

Note: THE LEVEL CONVERTER CHIP SUPPORTS TWO OUTPUT MODES. The DIFFERENCE IS THAT THE SUPPORTED rate is different. The INTERNAL structure OF the chip is completely the same. The open-drain and push-pull outputs are the objects on either side of the level conversion chip rather than itself.

2, RS010x series external resistance analysis

2.1 Analysis of RS010x pull-up resistance

The RS010x series converters integrate internal pull-up resistors to maintain output when drive logic is high. The internal pull-up resistors of the RS0101, RS0102, RS0104 and RS0108 converters are fixed to be 10 kΩ.

The One-shot acceleration circuit is designed to instantly increase the drive strength of the transition edge. When in DC steady state, the output is kept high by an internal pull-up resistor. Therefore, the addition of external pull-up or pull-down resistors can affect the output variation process. To demonstrate the resulting variation, the RS010x output was measured at three different pull-up and pull-down resistance values ranging from 1kΩ to 100 kω.