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SN74LVC245A: what's the highest frequency could be input to SN74LVC245APW?

Part Number: SN74LVC245A

Hi Team

The customer have a question about what's the highest frequency could be input to SN74LVC245APW?

My customer is planning to use SN74LVC245APW for the circuit below.

Square wave from external interface connector will be input to A,B pin of line receivers(AM26LS32ACPWR) first,

then be output from Y pin of line receivers(AM26LS32ACPWR) to the input (B pin) of SN74LVC245APW, 

finally, signal output from A pin of SN74LVC245APW will be input to FPGA to control. 

The square wave input to A,B pin of  line receivers(AM26LS32ACPWR) will be the same frequency but having 1/4 cycle gap between A,B pin. 

For now, the circuit is expected to have 136kHz square wave input, but finally it will have a chance to need to input more than 512kHz signal. 

SN74LVC245APW will be driven by 3.3V, DIR pin and OE pin fixed to GND. (bus signal direction fixed from B to A)

After referring to the datasheet, there's a sentence saying "All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω.".

Is that means input frequency to 10MHz is available? 

If not, what's the highest frequency could be input to SN74LVC245APW?

Thanks.