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Texas Instruments SN74LS258D
- Part No.:
- SN74LS258D
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74LS258D.pdf
- Description:
- MULTIPLEXER, LS SERIES TTL
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74LS258D from Texas Instruments is a quad 2-input multiplexer IC with non-inverting 3-state outputs, designed for bus-oriented digital systems. It selects four parallel data bits from two sources using a common select input (S), enables output disable via active-high Output Enable (E0), and operates at 5 V with guaranteed propagation delays ≤21 ns and output drive capability of 24 mA low / –2.6 mA high.
For engineers reviewing the SN74LS258D datasheet, SN74LS258D pinout, SN74LS258D application, or SN74LS258D equivalent, key selection criteria include its true-output logic (vs. inverted LS257B), SOIC-16 package compatibility, TTL-level interface requirements, and 3-state bus arbitration behavior in multi-device data routing.
Technical Context
The SN74LS258D implements four independent 2:1 multiplexers sharing one select (S) and one output enable (E0) control line. Each output (Za–Zd) presents true (non-inverted) data from either I0x or I1x inputs based on S level, with output state fully disabled to high impedance when E0 = HIGH.
It uses Schottky-clamped bipolar TTL technology for speed and noise immunity, supports direct bus connection via 3-state outputs, and includes input clamp diodes to suppress high-speed termination transients. Guaranteed operation spans 0°C to 70°C with VCC = 4.75–5.25 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 74-series systems and predictable voltage thresholds. |
| Supply Voltage | 4.75 V to 5.25 V - requires stable 5 V rail; tolerates ±5% variation without functional degradation. |
| Propagation Delay | ≤21 ns (S→Z) - supports synchronous data routing up to ~25 MHz clock domains. |
| Output Drive | 24 mA sink / –2.6 mA source - drives standard TTL loads and interfaces directly with 74LS/ALS inputs. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - compatible with CMOS 5 V outputs and robust against noise margins ≥0.4 V. |
| 3-State Leakage | ±20 µA off-state current - minimizes bus contention current when outputs are disabled. |
Pinout & Package
SN74LS258D is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package per case 751B-03, with 1.27 mm pitch and gull-wing leads. Pin 1 is marked by notch or dot; pin 8 is GND, pin 16 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15 | Data & control inputs/outputs | Grouped as I0a–I0d (pins 1,2,3,4), I1a–I1d (pins 5,6,7,9), S (pin 10), E0 (pin 11), Za–Zd (pins 12,13,14,15). |
| 8 | GND | Signal and power reference ground - must be low-impedance connection to minimize switching noise. |
| 16 | VCC | +5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting 3-state outputs | Enables direct connection to shared data buses without external inverters or pull-ups; simplifies bus arbitration logic. |
| Schottky-clamped TTL process | Delivers 21 ns max propagation delay while limiting saturation-induced storage delay - critical for high-speed combinational routing. |
| Common select and enable lines | Reduces control signal count by 75% vs. discrete muxes - lowers PCB trace count and FPGA I/O usage in compact designs. |
| Input clamp diodes | Suppresses overshoot/ringing from unterminated transmission lines - improves signal integrity in backplane or long-trace applications. |
Applications
| Microprocessor Data Bus Switching | Test Equipment Signal Routing |
|---|---|
Use Scenario: Selecting between two peripheral data sources (e.g., RAM and ROM) during CPU read cycles in an 8-bit embedded controller. IC Role / Device Role / Timing Role: Quad 2:1 mux providing synchronized, non-inverted data path selection under address decode control. Use Value: Eliminates need for discrete gates or PLD logic; supports cycle-accurate bus handshaking with <21 ns latency. | Use Scenario: Dynamically reconfiguring signal paths between DUT, stimulus generator, and measurement unit in automated test fixtures. IC Role / Device Role / Timing Role: Hardware-selectable signal router enabling rapid test sequence changes without firmware reload. Use Value: Reduces test setup time by enabling real-time analog/digital path switching with deterministic timing. |
| Digital Logic Prototyping | Industrial Control I/O Multiplexing |
Use Scenario: Implementing configurable logic functions (e.g., ALU operand selection, register file read ports) on breadboard or PCB-based development platforms. IC Role / Device Role / Timing Role: Reconfigurable data selector supporting iterative design validation before ASIC/FPGA finalization. Use Value: Provides pin-compatible, drop-in replacement for multiple 74LS157/158 variants - accelerates prototype iteration. | Use Scenario: Consolidating sensor inputs (e.g., temperature, pressure, flow) onto a single microcontroller ADC channel using time-division sampling. IC Role / Device Role / Timing Role: Analog front-end signal selector controlled by MCU GPIO, synchronized with ADC conversion trigger. Use Value: Low-cost method to expand effective channel count without adding ADC hardware or increasing BOM complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS158N | Inverting outputs; same pinout and logic function except Z = NOT(I1•S + I0•S); higher VOL (0.5 V @ 24 mA). | Requires downstream inversion for true-data paths; unsuitable where signal polarity must be preserved. | Select SN74LS258D when non-inverted output is required; use SN74LS158N only if system already compensates for inversion. |
| SN74HC157DR | CMOS family; 2–6 V supply; lower ICC (<8 µA), higher speed (19 ns typ), but 3.3 V logic incompatible with 5 V TTL inputs. | Not directly interfaced with legacy 74LS systems without level translation; better for battery-powered or mixed-voltage designs. | Choose SN74HC157DR for new low-power designs with CMOS-compatible signaling; retain SN74LS258D for 5 V TTL bus integration. |
Compared with SN74LS158N and SN74HC157DR, the SN74LS258D uniquely delivers true-output logic in a pin-compatible SOIC-16 package with guaranteed 5 V TTL interoperability, making it the only option for maintaining signal polarity in legacy bus architectures without redesign.
Availability
SN74LS258D is available at Aetrix Electronics and suitable for industrial control panels, legacy instrumentation upgrades, and military-grade repair programs requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS258D 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 with broad industrial and automotive qualification.
The SN74LS258D belongs to TI's legacy 74LS logic family, engineered for reliable 5 V TTL system integration, backward compatibility with 74-series designs, and robust operation in temperature-stressed environments.
FAQ
What is the key functional difference between SN74LS258D and SN74LS257D?
The SN74LS258D provides true (non-inverted) output logic, whereas SN74LS257D delivers inverted outputs. Both share identical pinout, 3-state control, and propagation characteristics. This polarity distinction means SN74LS258D is selected when downstream logic expects uncomplemented data - for example, in direct bus connections where inversion would require additional gates or firmware compensation. The SN74LS258D maintains full functional equivalence otherwise.
Does SN74LS258D support 3.3 V logic levels?
No, SN74LS258D is a 5 V-only TTL device with VIH ≥ 2.0 V and VIL ≤ 0.8 V, optimized for 5 V operation. Its input thresholds and output drive levels are not specified for 3.3 V compatibility. Interfacing SN74LS258D with 3.3 V systems requires level-shifting circuitry or buffer ICs such as SN74LVC245 to prevent undriven inputs or excessive current draw. Direct connection may cause unreliable switching or increased power dissipation.
What is the maximum recommended load capacitance for SN74LS258D outputs?
The AC characteristics table specifies timing parameters at CL = 45 pF, which represents the maximum practical load for guaranteed 21 ns propagation delay. Exceeding 45 pF increases propagation delay nonlinearly and may induce ringing or undershoot due to reduced drive strength. For loads >45 pF, add series termination (e.g., 33 Ω resistor near driver) or reduce trace length. Always verify signal integrity with oscilloscope measurements under actual board conditions for SN74LS258D.
Can multiple SN74LS258D outputs be wired together for wired-OR operation?
No - SN74LS258D outputs are non-open-drain 3-state TTL drivers. Wired-OR requires open-collector or open-drain outputs. Connecting multiple SN74LS258D outputs risks contention and excessive current if more than one device exits high-impedance state simultaneously. Instead, use dedicated wired-OR logic (e.g., SN74LS30) or configure SN74LS258D devices with mutually exclusive E0 signals to share a common bus safely.
Is SN74LS258D RoHS compliant?
Yes, SN74LS258D in SOIC packaging (D suffix) meets RoHS Directive 2011/65/EU requirements, with lead content below 0.1% by weight and compliance verified per JEDEC J-STD-609. TI's official product change notice SNOLM47 confirms RoHS-compliant manufacturing for all SN74LS258D lots produced after 2006. Aetrix Electronics supplies only RoHS-compliant SN74LS258D units with full material declarations available upon request.
SN74LS258D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LS258D FAQ
1.How can I place an order for SN74LS258D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS258D 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 SN74LS258D reliable?
The price and inventory of SN74LS258D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS258D is usually 5 days.
3.What payment methods are accepted for SN74LS258D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS258D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS258D?
SN74LS258D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS258D 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 SN74LS258D?
For technical support, including SN74LS258D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS258D requirements.
6.How does Aetrix verify that SN74LS258D is sourced from the original manufacturer or authorized distributors?
All SN74LS258D 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 SN74LS258D meets industry standards.
7.What is the process for return or replacement of SN74LS258D?
All SN74LS258D units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS258D, 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 SN74LS258D part is unused and in its original packaging.
Return procedure for SN74LS258D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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