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| PartNumber | SN74ALS191ANSR | SN74ALS191ANSRG4 | SN74ALS191ANSRE4 |
| Description | Counter ICs 4-Bit Synch Up/Down Binary Counter | Counter ICs 4B Synch Up Down Binary Counters | Counter ICs 4-Bit Synch Up/Down Binary Counter |
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Category | Counter ICs | Counter ICs | Counter ICs |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | SO-16 | SO-16 | SO-16 |
| Counter Type | Binary | Binary | Binary |
| Logic Family | TTL | TTL | TTL |
| Number of Bits | 4 | 4 | 4 |
| Counting Method | Synchronous | Synchronous | Synchronous |
| Counting Sequence | Up/Down | Up/Down | Up/Down |
| Operating Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Minimum Operating Temperature | 0 C | - | 0 C |
| Maximum Operating Temperature | + 70 C | - | + 70 C |
| Packaging | Reel | Reel | Reel |
| Operating Temperature Range | 0 C to + 70 C | - | 0 C to + 70 C |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Counter ICs | Counter ICs | Counter ICs |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Counter ICs | Counter ICs | Counter ICs |
| Unit Weight | 0.007079 oz | 0.007079 oz | 0.007079 oz |