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| PartNumber | SN74ALS191ANSR | SN74ALS191ANSRE4 | SN74ALS191ANS |
| Description | Counter ICs 4-Bit Synch Up/Down Binary Counter | Counter ICs 4-Bit Synch Up/Down Binary Counter | Counter Single 4-Bit Async Binary UP/Down 16-Pin SOP Tube |
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Category | Counter ICs | Counter ICs | Logic - Counters, Dividers |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | SO-16 | SO-16 | - |
| Counter Type | Binary | Binary | - |
| Logic Family | TTL | TTL | - |
| Number of Bits | 4 | 4 | - |
| Counting Method | Synchronous | Synchronous | - |
| Counting Sequence | Up/Down | Up/Down | - |
| Operating Supply Voltage | 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 | Tape & Reel (TR) |
| Operating Temperature Range | 0 C to + 70 C | 0 C to + 70 C | - |
| Brand | Texas Instruments | Texas Instruments | - |
| Product Type | Counter ICs | Counter ICs | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Counter ICs | Counter ICs | - |
| Unit Weight | 0.007079 oz | 0.007079 oz | - |
| Series | - | - | 74ALS |
| Package Case | - | - | 16-SOIC (0.209", 5.30mm Width) |
| Operating Temperature | - | - | 0°C ~ 70°C |
| Mounting Type | - | - | Surface Mount |
| Direction | - | - | Up, Down |
| Voltage Supply | - | - | 4.5 V ~ 5.5 V |
| Supplier Device Package | - | - | 16-SO |
| Number of Elements | - | - | 1 |
| Logic Type | - | - | Binary Counter |
| Number of Bits per Element | - | - | 4 |
| Reset | - | - | - |
| Timing | - | - | Synchronous |
| Count Rate | - | - | 30MHz |
| Trigger Type | - | - | Positive Edge |