7416821 Dual 10-bit 3-state D flip-flops. +----------+ +---------------+ /1OE |1 +--+ 56| 1CLK |/OE|CLK| D | Q | 1Q1 |2 55| 1D1 |---+---+---+---| 1Q2 |3 54| 1D2 | 1 | X | X | Z | GND |4 53| GND | 0 | / | 0 | 0 | 1Q3 |5 52| 1D3 | 0 | / | 1 | 1 | 1Q4 |6 51| 1D4 | 0 |!/ | X | - | VCC |7 50| VCC +---------------+ 1Q5 |8 49| 1D5 1Q6 |9 48| 1D6 1Q7 |10 47| 1D7 GND |11 46| GND 1Q8 |12 45| 1D8 1Q9 |13 44| 1D9 1Q10 |14 7416 43| 1D10 2Q1 |15 821 42| 2D1 2Q2 |16 41| 2D2 2Q3 |17 40| 2D3 GND |18 39| GND 2Q4 |19 38| 2D4 2Q5 |20 37| 2D5 2Q6 |21 36| 2D6 VCC |22 35| VCC 2Q7 |23 34| 2D7 2Q8 |24 33| 2D8 GND |25 32| GND 2Q9 |26 31| 2D9 2Q10 |27 30| 2D10 /2OE |28 29| 2CLK +----------+ [This information is part of the GIICM]