3.3v to 5v level shifter (bi-directional)

hi,

i have tried to buy max3372, lm3350 and QS3861 Ic's in Mumbai.

i have to interface aubtm-20(3.3v supply) with 8051(5v supply)

does anyone here know where i can buy these IC's or are there any alternatives to this.

level shifting is needed for UART communication betweeen autbm-20 and 8051. at 9600 to 115200bps baud rate.

thank you,

Vivek
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