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MC74ACT157D
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Product Detailed Parameters
- Description：IC MULTIPLEXER 4 X 2:1 16SOIC
- Series：74ACT
- Mfr：onsemi
- Package：Tube
- Type：Multiplexer
- Circuit：4 x 2:1
- Independent Circuits：1
- Current - Output High, Low：24mA, 24mA
- Voltage Supply Source：Single Supply
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：16-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：16-SOIC
- Grade：-
- Qualification：-
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Overview
The MC74ACT157D is a quad 2-input multiplexer in a 16-lead SOIC package. It features TTL-compatible inputs and outputs capable of sourcing or sinking 24 mA. Operating voltage ranges from 4.5 V to 5.5 V. Propagation delays are typically 7.0 ns to 9.5 ns at 50 pF load.
Feature Summary
- Quad 2-input multiplexing with common select and enable controls
- TTL-compatible input thresholds for direct interface
- Outputs provide both true (non-inverted) data signals
- Capable of functioning as a four-bit switch or function generator
Applications
- Routing data between two register groups to common output buses
- Implementing gating functions via variable logic generation
- Selecting specific data channels in digital systems
Procurement Notes
Verify the 'D' suffix confirms the SOIC-16 package type. Confirm the 'ACT' designation ensures TTL-compatible input levels are required for your design. Check RoHS compliance markings if lead-free materials are mandatory for your assembly process.
Selection Notes
Choose this component when TTL-level compatibility is necessary alongside high-speed switching. The ACT series provides faster propagation than standard AC devices while maintaining CMOS power efficiency. Ensure the 24 mA output drive capability meets the load requirements of the destination circuitry.
Part Context
This device belongs to the MC74AC/ACT157 family of quad multiplexers. It shares functional similarities with other 74-series logic but offers distinct speed and input threshold characteristics defined by the ACT logic family specifications.
Replacement Considerations
MC74ACT157DR2G
FAQ
How does the Enable input affect the outputs?
When the Enable input is HIGH, all outputs are forced LOW regardless of the Select or Data inputs. When LOW, the selected data inputs pass through to the outputs.
What is the difference between the AC and ACT versions?
The ACT version includes TTL-compatible input thresholds, allowing it to interface directly with TTL logic families, whereas the AC version requires higher voltage levels for logic HIGH recognition.
