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| PartNumber | SN74LS490N | SN74LS491ANS | SN74LS491NS |
| Description | Decade Counter, LS Series, Asynchronous, Negative Edge Triggered, 4-Bit, Up Direction, TTL, PDIP16 | Counter, Up/Down, 10 Bit Binary, 24 Pin, Plastic, DIP | Counter, Up/Down, 10 Bit Binary, 24 Pin, Plastic, DIP |
| Manufacturer | MOTOROLA | - | - |
| Product Category | IC Chips | - | - |