Datasheet for Fairchild Semiconductor DM74LS157 and DM74LS158 quad 2-line to 1-line data selectors/multiplexers, with specifications, electrical…
The DM74LS157 and DM74LS158 are quad 2‑line to 1‑line data selectors/multiplexers that include inverters and drivers for full on‑chip data selection. The DM74LS157 provides true data outputs, while the DM74LS158 delivers inverted outputs to reduce propagation delay.
The document lists typical propagation times, power dissipation, supply and input voltage ranges, output current capabilities, operating temperature limits, and the available SOIC, SOP, and PDIP packages. Absolute maximum ratings and recommended operating conditions are also provided.
| Typical Propagation Time (DM74LS157) | 9 ns |
|---|---|
| Typical Power Dissipation (DM74LS157) | 49 mW |
| Supply Voltage (VCC) Range | 4.75 V – 5.25 V (typical 5 V) |
| Input High Voltage (VIH) | 2 V |
| Input Low Voltage (VIL) | 0.8 V |
| Output High Current (IOH) | -0.4 mA |
| Output Low Current (IOL) | 8 mA |
| Operating Temperature Range | 0 °C to 70 °C |
| Storage Temperature Range | -65 °C to 150 °C |
The DM74LS157 has a typical propagation time of 9 ns, while the DM74LS158 typically propagates in 7 ns.
The recommended supply voltage is 5 V, with absolute limits of 4.75 V to 5.25 V.
The high‑level input voltage (VIH) is 2 V and the low‑level input voltage (VIL) is 0.8 V.