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TXB0108: Level-shifter driving current

Part Number: TXB0108
Other Parts Discussed in Thread: TXU0304, TXS0108E


I am designing the circuit that the STM32F4 control chip by SPI passes level-shifter, and the chip has fan-out 4 pcs in the same SPI route. The MCU voltage level is 3.3V, and the level-shifter is 1.8V, below is my schematic. My problem is that the SDO pin should output a voltage level of 1.8V, but only output 0.8V swing; and the SCK output is normal. Is that driving current not enough(Adding pull-up 50k does not affect the result)?