Fast bus driver TTL IC's with integrated 25R series resistors for for damping when driving large capacitive loads. Most also have center GND and VCC pins for reducing ground bounce.
+---+--+---+ /1OE |1 +--+ 20| VCC 1A1 |2 19| /2OE /2Y4 |3 18| /1Y1 1A2 |4 17| 2A4 /2Y3 |5 742 16| /1Y2 1A3 |6 240 15| 2A3 /2Y2 |7 14| /1Y3 1A4 |8 13| 2A2 /2Y1 |9 12| /1Y4 GND |10 11| 2A1 +----------+
+---+--+---+ /1OE |1 +--+ 20| VCC 1A4 |2 19| 2OE 2Y1 |3 18| 1Y1 1A3 |4 17| 2A4 2Y2 |5 742 16| 1Y2 1A2 |6 241 15| 2A3 2Y3 |7 14| 1Y3 1A1 |8 13| 2A2 2Y4 |9 12| 1Y4 GND |10 11| 2A1 +----------+
+---+--+---+ /1OE |1 +--+ 20| VCC 1A1 |2 19| /2OE 2Y4 |3 18| 1Y1 1A2 |4 17| 2A4 2Y3 |5 742 16| 1Y2 1A3 |6 244 15| 2A3 2Y2 |7 14| 1Y3 1A4 |8 13| 2A2 2Y1 |9 12| 1Y4 GND |10 11| 2A1 +----------+
+---+--+---+ +---+---*---+---+ DIR |1 +--+ 20| VCC |/EN|DIR| A | B | A0 |2 19| /EN +===+===*===+===+ A1 |3 18| B0 | 1 | X | Z | Z | A2 |4 17| B1 | 0 | 0 | B | Z | A3 |5 742 16| B2 | 0 | 1 | Z | A | A4 |6 245 15| B3 +---+---*---+---+ A5 |7 14| B4 A6 |8 13| B5 A7 |9 12| B6 GND |10 11| B7 +----------+
+---+--+---+ A1 |1 +--+ 28| A6 A2 |2 27| A7 A3 |3 26| A8 A4 |4 25| A9 A5 |5 24| A10 /OE1 |6 23| A11 VCC |7 742 22| GND GND |8 410 21| GND /OE2 |9 20| Y11 Y5 |10 19| Y10 Y4 |11 18| Y9 Y3 |12 17| Y8 Y2 |13 16| Y7 Y1 |14 15| Y6 +----------+
+---+--+---+ A1 |1 +--+ 28| A6 A2 |2 27| A7 A3 |3 26| A8 A4 |4 25| A9 A5 |5 24| A10 /OE1 |6 23| A11 VCC |7 742 22| GND GND |8 411 21| GND /OE2 |9 20|/Y11 /Y5 |10 19|/Y10 /Y4 |11 18|/Y9 /Y3 |12 17|/Y8 /Y2 |13 16|/Y7 /Y1 |14 15|/Y6 +----------+
+---+--+---+ +---+---+---*---+ /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 |5 742 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 +----------+
+---+--+---+ /OE1 |1 +--+ 24| VCC A1 |2 23| Y1 A2 |3 22| Y2 A3 |4 21| Y3 A4 |5 20| Y4 A5 |6 742 19| Y5 A6 |7 827 18| Y6 A7 |8 17| Y7 A8 |9 16| Y8 A9 |10 15| Y9 A10 |11 14| Y10 GND |12 13| /OE2 +----------+
+---+--+---+ /OE1 |1 +--+ 24| VCC A1 |2 23| /Y1 A2 |3 22| /Y2 A3 |4 21| /Y3 A4 |5 20| /Y4 A5 |6 742 19| /Y5 A6 |7 828 18| /Y6 A7 |8 17| /Y7 A8 |9 16| /Y8 A9 |10 15| /Y9 A10 |11 14| /Y10 GND |12 13| /OE2 +----------+
+---+--+---+ B8 |1 +--+ 24| VCC B7 |2 23| A8 B6 |3 22| A7 B5 |4 21| A6 B4 |5 20| A5 B3 |6 742 19| A4 B2 |7 952 18| A3 B1 |8 17| A2 /OEAB |9 16| A1 CLKAB |10 15| /OEBA /CEAB |11 14| CLKBA GND |12 13| /CEBA +----------+
+---+--+---+ B8 |1 +--+ 24| VCC B7 |2 23| A8 B6 |3 22| A7 B5 |4 21| A6 B4 |5 20| A5 B3 |6 742 19| A4 B2 |7 953 18| A3 B1 |8 17| A2 /OEAB |9 16| A1 CLKAB |10 15| /OEBA /CEAB |11 14| CLKBA GND |12 13| /CEBA +----------+
+---+--+---+ /1Y1 |1 +--+ 24| /1OE GND |2 23| 1A1 /1Y2 |3 22| 1A2 /1Y3 |4 21| VCC GND |5 20| 1A3 /1Y4 |6 7425 19| 1A4 /2Y1 |7 240 18| 2A1 GND |8 17| 2A2 /2Y2 |9 16| VCC /2Y3 |10 15| 2A3 GND |11 14| 2A4 /2Y4 |12 13| /2OE +----------+
+---+--+---+ 1Y1 |1 +--+ 24| /1OE GND |2 23| 1A1 1Y2 |3 22| 1A2 1Y3 |4 21| VCC GND |5 20| 1A3 1Y4 |6 7425 19| 1A4 2Y1 |7 240 18| 2A1 GND |8 17| 2A2 2Y2 |9 16| VCC 2Y3 |10 15| 2A3 GND |11 14| 2A4 2Y4 |12 13| /2OE +----------+
+---+--+---+ +---+---*---+---+ A1 |1 +--+ 24| DIR |/EN|DIR| A | B | GND |2 23| B1 +===+===*===+===+ A2 |3 22| B2 | 1 | X | Z | Z | A3 |4 21| VCC | 0 | 0 | B | Z | GND |5 20| B3 | 0 | 1 | Z | A | A4 |6 7425 19| B4 +---+---*---+---+ A5 |7 245 18| B5 GND |8 17| B6 A6 |9 16| VCC A7 |10 15| B7 GND |11 14| B8 A8 |12 13| /EN +----------+
+---+--+---+ A1 |1 +--+ 24| DIR GND |2 23| B1 A2 |3 22| B2 A3 |4 21| VCC GND |5 20| B3 A4 |6 7425 19| B4 A5 |7 642 18| B5 GND |8 17| B6 A6 |9 16| VCC A7 |10 15| B7 GND |11 14| B8 A8 |12 13| /OE +----------+