What would we do without them?
+---+--+---+ /OE |1 +--+ 20| VCC A0 |2 19| A=B B0 |3 18| B7 A1 |4 17| A7 B1 |5 74 16| B6 A2 |6 519 15| A6 B2 |7 14| B5 A3 |8 13| A5 B3 |9 12| B4 GND |10 11| A4 +----------+
+---+--+---+ /EN |1 +--+ 20| VCC A0 |2 19| A=B B0 |3 18| B7 A1 |4 17| A7 B1 |5 74 16| B6 A2 |6 520 15| A6 B2 |7 14| B5 A3 |8 13| A5 B3 |9 12| B4 GND |10 11| A4 +----------+
+---+--+---+ /OE |1 +--+ 20| VCC A0 |2 19| A=B B0 |3 18| B7 A1 |4 17| A7 B1 |5 74 16| B6 A2 |6 521 15| A6 B2 |7 14| B5 A3 |8 13| A5 B3 |9 12| B4 GND |10 11| A4 +----------+
+---+--+---+ +---+---+---*---+ /OE |1 +--+ 20| VCC |/OE| LE| D | Q | /Q1 |2 19| /Q8 +===+===+===*===+ D1 |3 18| D8 | 1 | X | X | Z | D2 |4 17| D7 | 0 | 0 | X | - | /Q2 |5 74 16| /Q7 | 0 | 1 | 0 | 0 | /Q3 |6 533 15| /Q6 | 0 | 1 | 1 | 1 | D3 |7 14| D6 +---+---+---*---+ D4 |8 13| D5 /Q4 |9 12| /Q5 GND |10 11| LE +----------+
+---+--+---+ +---+---+---*---+ /OE |1 +--+ 20| VCC |/OE|CLK| D |/Q | /Q1 |2 19| /Q8 +===+===+===*===+ D1 |3 18| D8 | 1 | X | X | Z | D2 |4 17| D7 | 0 | / | 0 | 1 | /Q2 |5 74 16| /Q7 | 0 | / | 1 | 0 | /Q3 |6 534 15| /Q6 | 0 |!/ | X | - | D3 |7 14| D6 +---+---+---*---+ D4 |8 13| D5 /Q4 |9 12| /Q5 GND |10 11| CLK +----------+
+---+--+---+ /OE1 |1 +--+ 20| VCC A1 |2 19| /OE2 A2 |3 18| /Y1 A3 |4 17| /Y2 A4 |5 74 16| /Y3 A5 |6 540 15| /Y4 A6 |7 14| /Y5 A7 |8 13| /Y6 A8 |9 12| /Y7 GND |10 11| /Y8 +----------+
+---+--+---+ /OE1 |1 +--+ 20| VCC A1 |2 19| /OE2 A2 |3 18| Y1 A3 |4 17| Y2 A4 |5 74 16| Y3 A5 |6 541 15| Y4 A6 |7 14| Y5 A7 |8 13| Y6 A8 |9 12| Y7 GND |10 11| Y8 +----------+
+---+--+---+ /LEBA |1 +--+ 24| VCC /GBA |2 23| /CEBA A1 |3 22| B1 A2 |4 21| B2 A3 |5 20| B3 A4 |6 74 19| B4 A5 |7 543 18| B5 A6 |8 17| B6 A7 |9 16| B7 A8 |10 15| B8 /CEAB |11 14| /LEAB GND |12 13| /GAB +----------+
+---+--+---+ /LEBA |1 +--+ 24| VCC /GBA |2 23| /CEBA A1 |3 22| B1 A2 |4 21| B2 A3 |5 20| B3 A4 |6 74 19| B4 A5 |7 544 18| B5 A6 |8 17| B6 A7 |9 16| B7 A8 |10 15| B8 /CEAB |11 14| /LEAB GND |12 13| /GAB +----------+
+---+--+---+ /ALD |1 +--+ 20| VCC CLK |2 19| RCO P0 |3 18| CCO P1 |4 17| /OE P2 |5 74 16| Q0 P3 |6 561 15| Q1 ENP |7 14| Q2 /ARST |8 13| Q3 /SRST |9 12| ENT GND |10 11| /SLD +----------+
+---+--+---+ +---+---+---*---+ /OE |1 +--+ 20| VCC |/OE| LE| D |/Q | D1 |2 19| /Q1 +===+===+===*===+ D2 |3 18| /Q2 | 1 | X | X | Z | D3 |4 17| /Q3 | 0 | 0 | X | - | D4 |5 74 16| /Q4 | 0 | 1 | 0 | 1 | D5 |6 563 15| /Q5 | 0 | 1 | 1 | 0 | D6 |7 14| /Q6 +---+---+---*---+ D7 |8 13| /Q7 D8 |9 12| /Q8 GND |10 11| LE +----------+
+---+--+---+ +---+---+---*---+ /OE |1 +--+ 20| VCC |/OE|CLK| D |/Q | D1 |2 19| /Q1 +===+===+===*===+ D2 |3 18| /Q2 | 1 | X | X | Z | D3 |4 17| /Q3 | 0 | / | 0 | 1 | D4 |5 74 16| /Q4 | 0 | / | 1 | 0 | D5 |6 564 15| /Q5 | 0 |!/ | X | - | D6 |7 14| /Q6 +---+---+---*---+ D7 |8 13| /Q7 D8 |9 12| /Q8 GND |10 11| CLK +----------+
+---+--+---+ U//D |1 +--+ 20| VCC CLK |2 19| /RCO P0 |3 18| /CCO P1 |4 17| /OE P2 |5 74 16| Q0 P3 |6 568 15| Q1 /ENP |7 14| Q2 /ARST |8 13| Q3 /SRST |9 12| /ENT GND |10 11| /LOAD +----------+
+---+--+---+ U//D |1 +--+ 20| VCC CLK |2 19| /RCO P0 |3 18| /CCO P1 |4 17| /OE P2 |5 74 16| Q0 P3 |6 569 15| Q1 /ENP |7 14| Q2 /ARST |8 13| Q3 /SRST |9 12| /ENT GND |10 11| /LOAD +----------+
+---+--+---+ +---+---+---*---+ /OE |1 +--+ 20| VCC |/OE| LE| D |/Q | D1 |2 19| Q1 +===+===+===*===+ D2 |3 18| Q2 | 1 | X | X | Z | D3 |4 17| Q3 | 0 | 0 | X | - | D4 |5 74 16| Q4 | 0 | 1 | 0 | 0 | D5 |6 573 15| Q5 | 0 | 1 | 1 | 1 | D6 |7 14| Q6 +---+---+---*---+ D7 |8 13| Q7 D8 |9 12| Q8 GND |10 11| LE +----------+
+---+--+---+ +---+---+---*---+ /OE |1 +--+ 20| VCC |/OE|CLK| D | Q | D1 |2 19| Q1 +===+===+===*===+ D2 |3 18| Q2 | 1 | X | X | Z | D3 |4 17| Q3 | 0 | / | 0 | 0 | D4 |5 74 16| Q4 | 0 | / | 1 | 1 | D5 |6 574 15| Q5 | 0 |!/ | X | - | D6 |7 14| Q6 +---+---+---*---+ D7 |8 13| Q7 D8 |9 12| Q8 GND |10 11| CLK +----------+
+---+--+---+ +----+---+---+---*---+ /RST |1 +--+ 24| VCC |/RST|/OE|CLK| D | Q | /OE |2 23| +====+===+===+===*===+ D1 |3 22| Q1 | 0 | 1 | X | X | Z | D2 |4 21| Q2 | X | 0 | X | X | 0 | D3 |5 20| Q3 | 1 | 0 | / | 0 | 0 | D4 |6 74 19| Q4 | 1 | 0 | / | 1 | 1 | D5 |7 575 18| Q5 | 1 | 0 |!/ | X | - | D6 |8 17| Q6 +----+---+---+---*---+ D7 |9 16| Q7 D8 |10 15| Q8 |11 14| CLK GND |12 13| +----------+
+---+--+---+ +---+---+---*---+ /OE |1 +--+ 20| VCC |/OE|CLK| D |/Q | D1 |2 19| /Q1 +===+===+===*===+ D2 |3 18| /Q2 | 1 | X | X | Z | D3 |4 17| /Q3 | 0 | / | 0 | 1 | D4 |5 74 16| /Q4 | 0 | / | 1 | 0 | D5 |6 576 15| /Q5 | 0 |!/ | X | - | D6 |7 14| /Q6 +---+---+---*---+ D7 |8 13| /Q7 D8 |9 12| /Q8 GND |10 11| CLK +----------+
+---+--+---+ +----+---+---+---*---+ /RST |1 +--+ 24| VCC |/RST|/OE|CLK| D |/Q | /OE |2 23| +====+===+===+===*===+ D1 |3 22| /Q1 | 0 | 1 | X | X | Z | D2 |4 21| /Q2 | X | 0 | X | X | 1 | D3 |5 20| /Q3 | 1 | 0 | / | 0 | 1 | D4 |6 74 19| /Q4 | 1 | 0 | / | 1 | 0 | D5 |7 577 18| /Q5 | 1 | 0 |!/ | X | - | D6 |8 17| /Q6 +----+---+---+---*---+ D7 |9 16| /Q7 D8 |10 15| /Q8 |11 14| CLK GND |12 13| +----------+
+---+--+---+ +---+---+---*---+ /OE |1 +--+ 20| VCC |/OE| LE| D |/Q | D1 |2 19| /Q1 +===+===+===*===+ D2 |3 18| /Q2 | 1 | X | X | Z | D3 |4 17| /Q3 | 0 | 0 | X | - | D4 |5 74 16| /Q4 | 0 | 1 | 0 | 1 | D5 |6 580 15| /Q5 | 0 | 1 | 1 | 0 | D6 |7 14| /Q6 +---+---+---*---+ D7 |8 13| /Q7 D8 |9 12| /Q8 GND |10 11| LE +----------+
+---+--+---+ P1 |1 +--+ 16| VCC P2 |2 15| P0 P3 |3 14| D P4 |4 74 13| SH//LD P5 |5 589 12| RCLK P6 |6 11| SCLK P7 |7 10| /OE GND |8 9| Q7 +----------+
+---+--+---+ Q1 |1 +--+ 16| VCC Q2 |2 15| Q0 Q3 |3 14| /OE Q4 |4 74 13| RCLK Q5 |5 590 12| /CLKEN Q6 |6 11| CCLK Q7 |7 10| /CRST GND |8 9| /RCO +----------+
+---+--+---+ P1 |1 +--+ 16| VCC P2 |2 15| P0 P3 |3 14| /CLOAD P4 |4 74 13| RCLK P5 |5 592 12| /CLKEN P6 |6 11| CCLK P7 |7 10| /CRST GND |8 9| /RCO +----------+
+---+--+---+ P0 |1 +--+ 20| VCC P1 |2 19| OE P2 |3 18| /OE P3 |4 17| /RCLKEN P4 |5 74 16| RCLK P5 |6 593 15| CLKEN P6 |7 14| /CLKEN P7 |8 13| CCLK /CLD |9 12| /CRST GND |10 11| /RCO +----------+
+---+--+---+ Y1 |1 +--+ 16| VCC Y2 |2 15| Y0 Y3 |3 14| A Y4 |4 74 13| /RRST Y5 |5 594 12| RCLK Y6 |6 11| SCLK Y7 |7 10| /SRST GND |8 9| Q7 +----------+
+---+--+---+ Y1 |1 +--+ 16| VCC Y2 |2 15| Y0 Y3 |3 14| A Y4 |4 74 13| /OE Y5 |5 595 12| RCLK Y6 |6 11| SCLK Y7 |7 10| /RST GND |8 9| Q7 +----------+
+---+--+---+ Y1 |1 +--+ 16| VCC Y2 |2 15| Y0 Y3 |3 14| D Y4 |4 74 13| /OE Y5 |5 596 12| RCLK Y6 |6 11| SCLK Y7 |7 10| /RST GND |8 9| Q7 +----------+
+---+--+---+ P1 |1 +--+ 16| VCC P2 |2 15| P0 P3 |3 14| D P4 |4 74 13| SH//LD P5 |5 597 12| RCLK P6 |6 11| SCLK P7 |7 10| /RST GND |8 9| Q7 +----------+
+---+--+---+ P0 |1 +--+ 20| VCC P1 |2 19| S P2 |3 18| D P3 |4 17| E P4 |5 74 16| /OE P5 |6 598 15| RCLK P6 |7 14| /SCE P7 |8 13| SCLK SH//LD |9 12| /RST GND |10 11| Q7 +----------+