| Electronic component: | Description: | Manuf. | Package | Pins | T°min | T°max | Datasheet |
|---|
| SN74LS490D | Dual decade counter | Motorola | SOIC | 16 | 0°C | 70°C | 161 K |
| SN74LS490N | Dual decade counter | Motorola | PDIP | 16 | 0°C | 70°C | 161 K |
| SN74LS540DW | Octal buffer/line driver with 3-state outputs | Motorola | SOIC | 20 | 0°C | 70°C | 203 K |
| SN74LS540N | Octal buffer/line driver with 3-state outputs | Motorola | PDIP | 20 | 0°C | 70°C | 203 K |
| SN74LS541DW | Octal buffer/line driver with 3-state outputs | Motorola | SOIC | 20 | 0°C | 70°C | 203 K |
| SN74LS569ADW | 4-bit up/down counter with 3-state outputs | Motorola | SOIC | 20 | 0°C | 70°C | 260 K |
| SN74LS569AN | 4-bit up/down counter with 3-state outputs | Motorola | PDIP | 20 | 0°C | 70°C | 260 K |
| SN74LS623DW | Octal bus transceiver with 3-state outputs | Motorola | SOIC | 20 | 0°C | 70°C | 70 K |
| SN74LS623N | Octal bus transceiver with 3-state outputs | Motorola | PDIP | 20 | 0°C | 70°C | 70 K |
| SN74LS640DW | Octal bus transceiver | Motorola | SOIC | 20 | 0°C | 70°C | 118 K |
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