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1 SN74HC540NSR OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS 520K TI 2140552
2 SN74HC540NSR OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTOUTS 653K TI 2140551
3 SN74HC540NSRE4 OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS 520K TI 2140550