7440 - (2x) NAND 4-input

symbol

function table

ABCD Y
0xxx 1
x0xx 1
xx0x 1
xxx0 1
1111 0

pin types

0 digital input (inverted) 0 digital output (inverted) 0 digital input-output (bidir) 0 analog (input or output) 0 positive power 0 ground 0 negative power