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| Part Number | SN74LS688N | SN74LS688N | SN74LS688NG4 | SN74LS688NE4 | SN74LS688NSR |
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Series | 74LS | * | 74LS | 74LS | 74LS |
| Package/Case | 20-DIP (0.300", 7.62mm) | - | 20-DIP (0.300", 7.62mm) | 20-DIP (0.300", 7.62mm) | 20-SOIC (0.209", 5.30mm Width) |
| Packaging | Tube | Bulk | Tube | Tube | Tape & Reel (TR) |
| Product Status | Active | Active | Discontinued at Digi-Key | Active | Active |
| Type | Identity Comparator | - | Identity Comparator | Identity Comparator | Identity Comparator |
| Number of Bits | 8 | - | 8 | 8 | 8 |
| Output | Active Low | - | Active Low | Active Low | Active Low |
| Output Function | A=B | - | A=B | A=B | A=B |
| Voltage - Supply | 4.85V ~ 5.25V | - | 4.85V ~ 5.25V | 4.85V ~ 5.25V | 4.85V ~ 5.25V |
| Current - Output High, Low | 400µA, 24mA | - | 400µA, 24mA | 400µA, 24mA | 400µA, 24mA |
| Max Propagation Delay @ V, Max CL | 23ns @ 5V, 45pF | - | 23ns @ 5V, 45pF | 23ns @ 5V, 45pF | 23ns @ 5V, 45pF |
| Current - Quiescent (Iq) | - | - | - | 65 mA | - |
| Operating Temperature | 0°C ~ 70°C | - | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C |
| Grade | - | - | - | - | - |
| Qualification | - | - | - | - | - |
| Supplier Device Package | 20-PDIP | - | 20-PDIP | 20-PDIP | 20-SO |
| Mounting Type | Through Hole | - | Through Hole | Through Hole | Surface Mount |
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