M54/74HCT157/158 are high speed CMOS QUAD 2-CHANNEL MULTI- PLEXERs fabricated with silicon gate C2MOS technology. They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. These devices consist of four 2-input digital multiplexers with common select and strobe inputs. The HCT158 is an inverting multiplexer while the HCT157 is a non-inverting multiplexer. When the STROBE input is held High, selection of data is inhibited and all the outputs become Low in the M74HCT157 and High in theM74HCT158. The SELECT decoding determines whether the A or B inputs get routed to their corresponding Y outputs. All inputs are equipped with protection circuits against static discharge and transient excess voltage.
This document is a technical datasheet for the SGS-Thomson Microelectronics M54HCT157/158 and M74HCT157/158 series. These are high-speed CMOS quad 2-channel multiplexers designed to achieve operation speeds similar to equivalent LSTTL while maintaining low power dissipation.
| Power Dissipation (Max) | 4 mW at Ta = 25 °C |
|---|---|
| Supply Voltage Range | 4.5 to 5.5 V |
| Operating Temperature (M74HC Series) | -40 to +85 °C |
| Output Drive Capability | 10 LSTTL Loads (Plastic Package) |
The HCT158 is an inverting multiplexer while the HCT157 is a non-inverting multiplexer.
The maximum power dissipation is 4 mW at 25 °C, and the input leakage current is a maximum of 40 µA.
The recommended operating conditions specify a supply voltage between 4.5 V and 5.5 V.
The M54HC series can be stored between -65 °C and +125 °C, while the M74HC series ranges from -40 °C to +85 °C.