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Product Detailed Parameters
- Description：BUS TRANSCEIVER, ALS SERIES
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Logic Type：-
- Number of Elements：-
- Number of Bits per Element：-
- Input Type：-
- Output Type：-
- Current - Output High, Low：-
- Voltage - Supply：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The SN74ALS2242D is a bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin SOIC package. It provides bidirectional data transfer between two buses with three-state outputs. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to +70°C. Key electrical characteristics include a low-level output current of 48 mA and a high-level output current of -15 mA. Propagation delay is typically 12 ns, ensuring efficient signal transmission for digital systems requiring reliable bus isolation and direction control.
Feature Summary
- Provides bidirectional data transfer between two independent buses
- Features three-state outputs for effective bus isolation
- Supports direction control via dedicated DIR pin
- Compatible with standard TTL logic levels
Applications
- Bidirectional bus architectures in microprocessor systems
- Memory interface circuits requiring data direction control
- I/O expansion modules with isolated bus segments
- Digital communication interfaces needing signal buffering
Procurement Notes
Verify the exact part number SN74ALS2242D against manufacturer datasheets to confirm package type (SOIC-20) and electrical specifications. Ensure compatibility with system voltage requirements (4.5V–5.5V) and temperature ranges (0°C–70°C). Check for RoHS compliance status as indicated in official documentation. Confirm availability through authorized distributors, noting that lead times may vary based on production schedules and regional stock levels.
Selection Notes
Select this component when bidirectional data transfer with three-state isolation is required in ALS-compatible designs. Consider its 48 mA low-level drive capability for moderate load conditions. Evaluate propagation delay performance relative to system timing constraints. Ensure PCB layout accommodates SOIC-20 footprint and thermal requirements for continuous operation within specified temperature limits.
Part Context
Part of Texas Instruments' SN74ALS series, designed for high-speed digital applications. The ALS family offers improved speed-power product compared to standard TTL. This specific model serves as a buffer/transceiver for bidirectional data paths, commonly used in legacy or specialized industrial control systems where ALS compatibility is maintained.
Replacement Considerations
SN74ALS2242DR is the tape-and-reel variant of the same functional device. Verify pinout and electrical parameters match before substitution. Other ALS bus transceivers may require level shifting or direction control circuit modifications.
