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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  74LS191 | Synchronous 4-Bit Up/Down Counter with Mode Control | Fairchild Semiconductor | FAIRCHILD | - | - | - | 76 Kb |
| 2. | 74LS191 | Synchronous Up/Down 4-bit Binary Counters(single clock line) | Hitachi Semiconductor | HITACHI | - | - | - | 103 Kb |
| 3. | 74ALS191 | SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS | Texas Instruments | TI | - | - | - | 128 Kb |
| 4. | AM27S191 | 16,384-BIT (2048 x 8) BIPOLAR PROM | Advanced Micro Devices | AMD | - | - | - | 426 Kb |
| 5. | 82LHS191 | 16K-BIT TTL BIPOLAR PROM | NXP Semiconductors | PHILIPS | - | - | - | 144 Kb |
| 6. | AM27PS191 | 16,384-BIT (2048 x 8) BIPOLAR PROM | Advanced Micro Devices | AMD | - | - | - | 426 Kb |
| 7. | DM54LS191 | Synchronous 4-Bit Up/Down Counters with Mode Control | National Semiconductor | NSC | - | - | - | 171 Kb |
| 8. | DM74LS191 | Synchronous 4-Bit Up/Down Counter with Mode Control | Fairchild Semiconductor | FAIRCHILD | - | - | - | 76 Kb |
| 9. | DM74LS191 | Synchronous 4-Bit Up/Down Counters with Mode Control | National Semiconductor | NSC | - | - | - | 171 Kb |
| 10. | HD74LS191 | Synchronous Up/Down 4-bit Binary Counters(single clock line) | Hitachi Semiconductor | HITACHI | - | - | - | 103 Kb |
| 11. | SN54LS191 | SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL | Texas Instruments | TI | - | - | - | 524 Kb |
| 12. | SN74LS191 | SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL | Texas Instruments | TI | - | - | - | 524 Kb |
| 13. | HD74LS191 | Ouadruple 2-input Positive NAND Gates | Hitachi Semiconductor | HITACHI | - | - | - | 5.74 Mb |
| 14. | HD74LS191 | Synchronous Up / Down 4-bit Binary Counter (single clock line) | Renesas Technology Corp | RENESAS | - | - | - | 97 Kb |
| 15. | SN54ALS191 | SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS | Texas Instruments | TI | - | - | - | 136 Kb |
| 16. | SN74ALS191 | SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS | Texas Instruments | TI | - | - | - | 136 Kb |
| 17. | SN75ALS191 | DUAL DIFFERENTIAL LINE DRIVER | Texas Instruments | TI | - | - | - | 72 Kb |
| 18. | UT54ACS191 | Radiation-hardened synchronous 4-bit up-down binary counter. | List of Unclassifed Manufacturers | ETC | - | - | - | 100 Kb |
| 19. | UT54ACS191 | Radiation-hardened synchronous 4-bit up-down binary counter. | List of Unclassifed Manufacturers | ETC | - | - | - | 100 Kb |
| 20. | UT54ACTS191 | Radiation-hardened synchronous 4-bit up-down binary counter. | List of Unclassifed Manufacturers | ETC | - | - | - | 100 Kb |
