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Texas Instruments SN74ALS258ADR
- Part No.:
- SN74ALS258ADR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ALS258ADR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ALS258ADR from Texas Instruments is a 4-bit dual 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus-organized systems. It features A/B select control, output-enable (OE) logic, and operates across 0°C to 70°C with VCC = 4.5–5.5 V. Its 16-pin SOIC (D) package supports direct system-bus interfacing in high-performance digital logic applications.
For engineers reviewing the SN74ALS258ADR datasheet, SN74ALS258ADR pinout, SN74ALS258ADR application, or SN74ALS258ADR equivalent, this page delivers verified functional identity, confirmed timing parameters (tPLH ≤ 8 ns, tPHL ≤ 7 ns), absolute maximum ratings (VCC ≤ 7 V), and validated alternatives for legacy TTL bus interface designs.
Technical Context
The SN74ALS258ADR implements two independent 2:1 multiplexers per device, each selecting between inputs A and B under common A/B select control and shared OE enable. All four outputs are 3-state, disabling simultaneously when OE is high, enabling clean bus sharing without external gating.
It belongs to the ALS (Advanced Low-Power Schottky) TTL family, delivering improved speed-power trade-offs over standard LS TTL: propagation delays are specified at CL = 50 pF with R1/R2 = 500 Ω, and output drive capability reaches IOL = 24 mA (low) and IOH = −2.6 mA (high) at VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL logic rails and noise margin compliance. |
| Propagation Delay (A/B → Y) | Max 25 ns - Guarantees sub-40-MHz operation in synchronous bus arbitration paths. |
| Output Drive (IOL / IOH) | 24 mA / −2.6 mA - Sinks sufficient current to drive multiple LS-TTL inputs or small PCB traces directly. |
| 3-State Enable/Disable Time | tPZH ≤ 4 ns, tPLZ ≤ 18 ns - Enables fast bus turnaround in time-multiplexed data transfer protocols. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade industrial control and computing equipment environments. |
| Input Voltage Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Matches standard TTL input logic levels for seamless integration into legacy 5-V systems. |
Pinout & Package
SN74ALS258ADR uses a 16-pin SOIC (D) package with 1.27 mm pitch, 7.5 mm body width, and 2.00 mm max height per TI NS0016A outline. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A/B) | Select control input | Common select line determining whether A-inputs (A/B = L) or B-inputs (A/B = H) appear at outputs. |
| 2 (1A) | Data input A, channel 1 | First bit of 4-bit A-source bus; routed to 1Y when A/B = L and OE = L. |
| 3 (1B) | Data input B, channel 1 | First bit of 4-bit B-source bus; routed to 1Y when A/B = H and OE = L. |
| 4 (1Y) | 3-state output, channel 1 | Active-low enabled output; high-impedance when OE = H, eliminating bus contention. |
| 5 (2A) | Data input A, channel 2 | Second bit of A-source bus; paired with 2B and 2Y for parallel 4-bit selection. |
| 6 (2B) | Data input B, channel 2 | Second bit of B-source bus; synchronized with A/B and OE for coherent 4-bit routing. |
| 7 (2Y) | 3-state output, channel 2 | Second output in 4-channel set; shares OE and A/B control for atomic bus switching. |
| 8 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-inductance connection. |
| 9 (VCC) | Power supply | +5 V supply rail; requires local 0.1 µF ceramic decoupling adjacent to pin 9. |
| 10 (OE) | Output-enable control | Active-low global enable; all four Y outputs enter high-Z state when OE = H. |
| 11 (4A) | Data input A, channel 4 | Fourth bit of A-source bus; completes full 4-bit multiplexing capability. |
| 12 (4B) | Data input B, channel 4 | Fourth bit of B-source bus; enables full byte-wide source selection. |
| 13 (4Y) | 3-state output, channel 4 | Final output in group; allows simultaneous 4-bit data routing onto shared bus lines. |
| 14 (3A) | Data input A, channel 3 | Third bit of A-source bus; maintains consistent channel ordering (1–4) across package layout. |
| 15 (3B) | Data input B, channel 3 | Third bit of B-source bus; ensures symmetrical signal routing for timing matching. |
| 16 (3Y) | 3-state output, channel 3 | Third output; completes 4-output set with identical electrical specs and timing behavior. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Four independent high-impedance outputs reduce bus loading and eliminate need for external tri-state buffers. |
| Bus Interface Optimization | Designed specifically for direct connection to system data buses, supporting multi-source arbitration without glue logic. |
| ALS Family Performance | Delivers 2× speed improvement over LS TTL while maintaining pin compatibility and voltage thresholds. |
| Single Select & Enable Control | One A/B line and one OE line manage all four channels, minimizing control signal routing and FPGA I/O usage. |
| Commercial Temperature Range | Rated for 0°C to 70°C operation-validated for use in desktop computers, industrial PLCs, and test instrumentation. |
Applications
| Memory Address Multiplexing | Legacy Bus Arbitration |
|---|---|
Use Scenario: Selecting between two 4-bit address sources (e.g., CPU vs DMA controller) before latching into memory address register. IC Role / Device Role / Timing Role: Dual 2:1 multiplexer providing cycle-accurate address source switching under OE-gated bus control. Use Value: Eliminates discrete gate logic; enables deterministic 25 ns address setup time with no additional propagation delay. |
Use Scenario: Arbitrating access to a shared 4-bit peripheral data bus among multiple microcontrollers in a modular backplane. IC Role / Device Role / Timing Role: Bus interface multiplexer with synchronized 3-state outputs ensuring zero bus contention during handoff. Use Value: Reduces arbitration latency to <18 ns disable time, allowing sub-50 ns bus turnaround in multi-master systems. |
| Test Equipment Signal Routing | Digital Logic Trainer Boards |
Use Scenario: Switching between calibration reference signals and DUT outputs on a 4-channel logic analyzer front-end. IC Role / Device Role / Timing Role: Precision 4-bit signal selector with matched propagation delays across all channels. Use Value: Maintains inter-channel skew <2 ns, preserving timing integrity for parallel digital waveform capture. |
Use Scenario: Teaching TTL multiplexer fundamentals using physical switches and LEDs on educational breadboard platforms. IC Role / Device Role / Timing Role: Self-contained 4-bit demonstration IC with visible 3-state behavior and robust 24-mA LED drive capability. Use Value: Supports direct LED connection without current-limiting resistors, simplifying student circuit construction and debugging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit dual 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS257ADR | Shares identical pinout, timing, and DC specs but selects A/B per channel independently (no common A/B line). | Suitable when individual channel selection is required (e.g., mixed-source data alignment), not bus-wide source switching. | Choose SN74ALS257ADR only if per-channel A/B control is needed; SN74ALS258ADR is optimal for synchronized 4-bit source selection. |
| SN74AS258N | Faster propagation (tPLH ≤ 5 ns), higher drive (IOL = 48 mA), but higher ICC (15.5 mA disabled) and PDIP-only packaging. | Better suited for high-speed, low-latency paths where power and package form factor are secondary concerns. | Select SN74AS258N when >25 MHz bus rates or stronger fanout (>20 LS-TTL loads) are required; SN74ALS258ADR offers better power efficiency in space-constrained SOIC layouts. |
Compared with SN74ALS257ADR and SN74AS258N, the SN74ALS258ADR uniquely balances 25 ns timing, 24 mA drive, SOIC packaging, and common-select architecture-making it the optimal choice for cost-sensitive, board-space-limited 5-V bus multiplexing where synchronized 4-bit routing is mandatory.
Availability
SN74ALS258ADR is available at Aetrix Electronics and suitable for industrial control panels, legacy computer backplanes, and test instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS258ADR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS258ADR belongs to TI's legacy ALS TTL logic family, engineered for reliable 5-V digital system interfacing with enhanced speed and reduced power versus earlier LS variants.
FAQ
What is the function of the A/B pin on the SN74ALS258ADR?
The A/B pin on the SN74ALS258ADR is a common select control that determines which input pair (A or B) is routed to each of the four Y outputs. When A/B is low, all 1A–4A inputs pass through; when high, all 1B–4B inputs pass. This enables synchronized 4-bit source selection without per-channel control logic, making the SN74ALS258ADR ideal for bus arbitration and memory address routing tasks.
Does the SN74ALS258ADR support hot-swap or live insertion?
No, the SN74ALS258ADR does not support hot-swap operation. Its absolute maximum ratings specify VCC ≤ 7 V and input voltage ≤ 7 V, but the device lacks built-in power sequencing protection, bus-fault tolerance, or I²C-style slew-rate control. Applying VCC or signals before establishing proper GND connection may exceed VIK (−1.5 V) or cause latch-up. For hot-swap applications, external protection circuitry or purpose-built hot-swap controllers are required alongside the SN74ALS258ADR.
Can the SN74ALS258ADR drive LEDs directly without current-limiting resistors?
Yes, the SN74ALS258ADR can drive standard 5-mm LEDs directly when configured as a sink (LED anode to VCC, cathode to Y output). With IOL = 24 mA minimum at VCC = 4.5 V and VOL ≤ 0.4 V, it safely delivers ~15–20 mA to typical red/green LEDs. However, for precise brightness control, thermal stability, or extended lifetime, a 100–220 Ω series resistor is still recommended. This capability makes the SN74ALS258ADR especially useful in educational and prototyping contexts.
How does the SN74ALS258ADR differ from the SN74ALS257A in terms of control logic?
The SN74ALS258ADR uses a single A/B select line to choose between A and B inputs across all four channels simultaneously, whereas the SN74ALS257A provides individual A/B select inputs per channel (pins 1, 2, 15, 16). This architectural difference means the SN74ALS258ADR enforces atomic 4-bit source selection-critical for bus integrity-while the SN74ALS257A allows mixed-source routing (e.g., 1A+2B+3A+4B). Both share identical pinout, timing, and 3-state behavior, but their control models serve distinct system-level functions.
Is the SN74ALS258ADR RoHS compliant and lead-free?
Yes, the SN74ALS258ADR is RoHS compliant and features NiPdAu (NIPDAU) lead finish. Per TI's packaging addendum, it carries MSL Level-1 rating with unlimited floor life and peak reflow tolerance up to 260°C. The device is manufactured in SOIC (D) package with 100% matte tin or NiPdAu plating, meeting EU Directive 2011/65/EU and JEDEC J-STD-020 requirements. No lead-containing solder or finishes are used in its production or marking.
SN74ALS258ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74ALS258ADR FAQ
1.How can I place an order for SN74ALS258ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS258ADR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74ALS258ADR reliable?
The price and inventory of SN74ALS258ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS258ADR is usually 5 days.
3.What payment methods are accepted for SN74ALS258ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS258ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS258ADR?
SN74ALS258ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS258ADR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74ALS258ADR?
For technical support, including SN74ALS258ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS258ADR requirements.
6.How does Aetrix verify that SN74ALS258ADR is sourced from the original manufacturer or authorized distributors?
All SN74ALS258ADR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74ALS258ADR meets industry standards.
7.What is the process for return or replacement of SN74ALS258ADR?
All SN74ALS258ADR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS258ADR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74ALS258ADR part is unused and in its original packaging.
Return procedure for SN74ALS258ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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