View pcf8574t datasheet:

PCF8574T (1/2) IL22 ?????????? C-MOS REMOTE 8-BIT I/O EXPANDER � TOP VIEW � 1 13 A0 INT 2 A0 IN 1 VDD 16 A1 3 4 A2 P0 5 A1 IN 2 15 SDA P1 14 6 SCL P2 7 A2 IN 3 14 SCL P3 9 P4 10 P0 I/O 4 13 INT P5 11 P6 12 P1 I/O 5 12 P7 I/O P7 15 SDA P2 I/O 6 11 P6 I/O P3 I/O 7 10 P5 I/O 8 GND 9 P4 I/O INPUT A0 - A2 ; ADDRESS INPUTS SCL ; SYSTEM CLOCK LINE OUTPUT INT ; INTE

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BJT: SBT42 | 2SA200-Y | 2SA200-O | 2SD882-Q | 2SD882-P | 2SD882-E | 2SC945-L | 2SC945-H | 2SC4226-R23 | 2SC3357-F | 2SC3357-E | 2SC3356-R26 | 2SC3356-R24 | 2SC3356-R23 | 2SB772-Q | 2SB772-P | 2SB772-E | 2SA1015-L | 2SA1015-H | HSS8550 | HSS8050