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| Part Number | SN74LS28DR | SN74LS38DR | SN74LS20DR | SN74LS21DR | SN74LS26DR | SN74LS27DR |
|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Status | Active | Active | Active | Active | Active | Active |
| Logic Type | - | NAND Gate | NAND Gate | AND Gate | NAND Gate | NOR Gate |
| Number of Circuits | - | 4 | 2 | 2 | 4 | 3 |
| Number of Inputs | - | 2 | 4 | 4 | 2 | 3 |
| Features | - | Open Collector | - | - | Open Collector | - |
| Voltage - Supply | - | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Current - Quiescent (Max) | - | 2 mA | 800 µA | - | - | 4 mA |
| Current - Output High, Low | - | -, 24mA | 400µA, 8mA | 400µA, 8mA | -, 8mA | 400µA, 8mA |
| Logic Level - Low | - | 0.8V | 0.8V | 0.8V | 0.8V | 0.8V |
| Logic Level - High | - | 2V | 2V | 2V | 2V | 2V |
| Max Propagation Delay @ V, Max CL | - | 32ns @ 5V, 45pF | 15ns @ 5V, 15pF | 20ns @ 5V, 15pF | 32ns @ 5V, 15pF | 15ns @ 5V, 15pF |
| Operating Temperature | - | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C |
| Mounting Type | - | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Supplier Device Package | - | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Package / Case | - | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) |
