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MC68B44
Direct Memory Access Controller 2MHz, DIP-40
Schematic Symbol
Pin Configuration (40 pins)
| Pin | Name | Type |
|---|---|---|
| 1 | VSS | power_in |
| 2 | ~{CS}/Tx_AKB | bidirectional |
| 3 | R/~{W} | bidirectional |
| 4 | A0 | bidirectional |
| 5 | A1 | bidirectional |
| 6 | A2 | bidirectional |
| 7 | A3 | bidirectional |
| 8 | A4 | bidirectional |
| 9 | A5 | output |
| 10 | A6 | output |
| 11 | A7 | output |
| 12 | A8 | output |
| 13 | A9 | output |
| 14 | A10 | output |
| 15 | A11 | output |
| 16 | A12 | output |
| 17 | A13 | output |
| 18 | A14 | output |
| 19 | A15 | output |
| 20 | VCC | power_in |
| 21 | D7 | bidirectional |
| 22 | D6 | bidirectional |
| 23 | D5 | bidirectional |
| 24 | D4 | bidirectional |
| 25 | D3 | bidirectional |
| 26 | D2 | bidirectional |
| 27 | D1 | bidirectional |
| 28 | D0 | bidirectional |
| 29 | Tx_RQ3 | input |
| 30 | Tx_RQ2 | input |
| 31 | Tx_RQ1 | input |
| 32 | Tx_RQ0 | input |
| 33 | ~{IRQ}/~{DEND} | output |
| 34 | ~{Tx_STB} | output |
| 35 | Tx_AKA | output |
| 36 | ~{DRQ2} | output |
| 37 | ~{DRQ1} | output |
| 38 | DGRNT | input |
| 39 | ~{RESET} | input |
| 40 | E | input |
Footprint
ConfirmedPackage_DIP/DIP-40_W15.24mm
Pad Layout
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40
Pads (40)
| Number | Type |
|---|---|
| 1 | thru hole |
| 2 | thru hole |
| 3 | thru hole |
| 4 | thru hole |
| 5 | thru hole |
| 6 | thru hole |
| 7 | thru hole |
| 8 | thru hole |
| 9 | thru hole |
| 10 | thru hole |
| 11 | thru hole |
| 12 | thru hole |
| 13 | thru hole |
| 14 | thru hole |
| 15 | thru hole |
| 16 | thru hole |
| 17 | thru hole |
| 18 | thru hole |
| 19 | thru hole |
| 20 | thru hole |
| 21 | thru hole |
| 22 | thru hole |
| 23 | thru hole |
| 24 | thru hole |
| 25 | thru hole |
| 26 | thru hole |
| 27 | thru hole |
| 28 | thru hole |
| 29 | thru hole |
| 30 | thru hole |
| 31 | thru hole |
| 32 | thru hole |
| 33 | thru hole |
| 34 | thru hole |
| 35 | thru hole |
| 36 | thru hole |
| 37 | thru hole |
| 38 | thru hole |
| 39 | thru hole |
| 40 | thru hole |