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Texas Instruments SN74AS250ADWR
- Part No.:
- SN74AS250ADWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS250ADWR.pdf
- Description:
- IC DATA GEN/MULTPL 1X16:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,409
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Product details
Overview
SN74AS250ADWR from Texas Instruments is a 16-channel analog multiplexer/demultiplexer IC with active-low 3-state output enable, 4-bit binary address decoding (A–D), symmetrical propagation delay (2–8 ns), and TTL-compatible inputs/outputs operating at 4.5–5.5 V. It serves as a data source selector in bus-oriented digital systems requiring high-speed, low-glitch signal routing.
For engineers reviewing the SN74AS250ADWR datasheet, SN74AS250ADWR pinout, SN74AS250ADWR application, or SN74AS250ADWR equivalent, key selection criteria include its 16-input single-output architecture, OE-controlled high-impedance output state, ±48 mA output drive capability, and DW package compatibility with surface-mount PCB assembly.
Technical Context
The SN74AS250ADWR implements full 4-bit binary decoding to select one of sixteen data inputs (E0–E15) onto a common inverting W output, with address lines A, B, C, and D directly controlling selection. Its internal logic includes buffered 3-state bus driver inputs and an independent OE input that places W in high-Z without affecting internal data latching.
Propagation delays are symmetrical (tPLH/tPHL ≤ 8 ns at VCC = 5 V, CL = 50 pF), minimizing transient hazards during switching. The device supports n-line-to-1-line cascading via OE, enabling hierarchical multiplexing while maintaining stable bus isolation during output disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL logic rails and noise margin compliance. |
| Propagation Delay (W) | 2–8 ns - Enables high-speed data routing in real-time control and parallel-to-serial conversion paths. |
| Output Drive (IOL/IOH) | 48 mA sink / −15 mA source - Supports direct interfacing with multiple TTL loads without external buffers. |
| Input Voltage Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Guarantees robust noise immunity and reliable logic-level recognition across temperature. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded systems and industrial control panels. |
| Output Enable Response | tPZL ≤ 9 ns, tPHZ ≤ 6 ns - Allows rapid bus release and reacquisition in time-critical arbitration schemes. |
Pinout & Package
The SN74AS250ADWR is supplied in a 24-pin plastic small-outline (DW) package with 300-mil width, gull-wing leads, and JEDEC MO-153AA compliance. Pin pitch is 0.025 inch (0.635 mm), body width 0.300 inch (7.62 mm), and total length 0.600 inch (15.24 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8, 10–13, 15–24 | Data Inputs E0–E15 | 16 bidirectional analog/digital signal sources selected by address bits; no internal pull-ups or clamps. |
| 9 | Output Enable (OE) | Active-low control: OE = H forces W into high-impedance state without disrupting internal selection logic. |
| 14 | Inverting Output (W) | Single-ended, buffered, 3-state output delivering inverted selected input; drives up to 10 TTL loads. |
| 16–19 | Address Inputs A–D | Binary-coded selection lines (LSB A, MSB D); synchronous with data setup/hold timing requirements. |
| 20 | GND | Power return reference for all logic and output stages; requires low-inductance local decoupling. |
| 24 | VCC | +5 V supply rail; must be bypassed with 0.1 µF ceramic capacitor near pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical Propagation Delay | Identical tPLH and tPHL (≤8 ns) eliminates pulse skew in critical timing paths and reduces glitch risk. |
| Buffered 3-State Bus Driver Inputs | Enables direct connection to shared data buses without contention; OE disables W while preserving internal state. |
| Full Binary Decoding Logic | Direct 1-of-16 selection using only four address lines-no external decode logic required for basic multiplexing. |
| High-Current Output Capability | 48 mA sink current supports driving multiple TTL inputs or low-impedance transmission lines without buffering. |
| Stable High-Impedance State | IOZH/IOZL ≤ ±50 µA ensures minimal bus leakage when disabled-critical for multi-drop bus integrity. |
Applications
| Boolean Function Generator | Parallel-to-Serial Converter |
|---|---|
Use Scenario: Implementing arbitrary 4-input combinational logic functions using programmable address inputs and fixed data patterns. IC Role / Device Role / Timing Role: Acts as a configurable logic array cell where E0–E15 represent truth table outputs mapped to A–D address combinations. Use Value: Eliminates need for discrete gate arrays or PROM-based logic; enables fast prototyping of custom logic with zero gate delay overhead. |
Use Scenario: Converting 16-bit parallel data streams (e.g., from ADC or memory) into time-multiplexed serial output for UART or shift-register interfaces. IC Role / Device Role / Timing Role: Serves as the core data selector synchronized to a 4-bit counter clock; W delivers sequential E0→E15 under address increment. Use Value: Achieves deterministic 16× serialization with sub-10 ns channel switching-no microcontroller intervention required. |
| Data Source Selector | Bus Arbitration Interface |
Use Scenario: Selecting among 16 sensor inputs, DAC outputs, or peripheral registers in a shared-bus microcontroller system. IC Role / Device Role / Timing Role: Functions as a centralized analog/digital signal router controlled by CPU address lines or FPGA configuration. Use Value: Reduces PCB trace count and connector pins by consolidating multiple signal paths into one routed output line. |
Use Scenario: Managing access to a shared diagnostic bus where multiple subsystems assert status signals only when selected. IC Role / Device Role / Timing Role: Provides isolated, OE-gated connection between each subsystem's status line and the central monitoring bus. Use Value: Prevents bus contention during fault conditions; enables hot-swap-safe diagnostics without external isolation switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS250N | Slower propagation (25 ns), lower drive (8 mA), no symmetrical delay; TTL-compatible but not AS-series speed grade. | Acceptable for non-real-time logic generation or low-frequency bus selection where timing margins exceed 20 ns. | Select when cost sensitivity outweighs speed requirements and legacy LS-family compatibility is needed. |
| CD74HC250E | CMOS technology, wider VCC range (2–6 V), lower power (ICC < 8 µA), but slower (20 ns @ 4.5 V) and lower drive (±4 mA). | Suitable for battery-powered or mixed-voltage systems where power efficiency matters more than bus drive strength. | Choose for low-power portable designs or 3.3-V logic domains; avoid where TTL load driving or sub-10 ns timing is mandatory. |
Compared with SN74LS250N and CD74HC250E, the SN74AS250ADWR uniquely delivers both high-speed propagation (≤8 ns) and strong TTL-compatible output drive (48 mA), making it optimal for time-critical bus multiplexing in 5-V industrial control and test equipment.
Availability
SN74AS250ADWR is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS250ADWR 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 SN74AS250ADWR belongs to TI's Advanced Schottky (AS) logic family, designed specifically for high-speed, low-noise digital signal routing in mission-critical commercial and industrial systems.
FAQ
What is the function of the W output on the SN74AS250ADWR?
The W output on the SN74AS250ADWR is an active-low, inverting, 3-state output that delivers the selected data input (E0–E15) based on the binary value of address lines A–D. When OE is low, W presents the inverted version of the selected Ei; when OE is high, W enters high-impedance mode. This behavior is explicitly defined in the function table and logic diagram of the SN74AS250ADWR datasheet.
Does the SN74AS250ADWR support cascading with other multiplexers?
Yes, the SN74AS250ADWR supports cascading via its buffered OE input: multiple devices can share a common address bus while using individual OE lines to enable one output at a time onto a shared W line. This allows expansion beyond 16 inputs without external gating logic, as confirmed by the "n-line to 1-line cascading" feature description in the SN74AS250ADWR datasheet.
What is the maximum capacitive load the SN74AS250ADWR can drive reliably?
The SN74AS250ADWR is characterized for CL = 50 pF in its switching characteristics table, with guaranteed tPLH/tPHL performance up to that load. Driving heavier capacitance (e.g., >75 pF) degrades propagation delay and may increase transition time-induced noise; for such cases, TI recommends adding a buffer stage or verifying timing margins per the SN74AS250ADWR application notes.
Is the SN74AS250ADWR pin-compatible with the SN74AS250AN?
No, the SN74AS250ADWR (DW package) is not pin-compatible with the SN74AS250AN (NT/DIP package): although both use 24-pin footprints, the DW has gull-wing surface-mount leads while the NT uses through-hole leads with different mechanical dimensions and solder pad layout. PCB redesign is required when substituting between these packages, as confirmed by TI's packaging addendum for SN74AS250ADWR.
Can the SN74AS250ADWR operate with a 3.3-V supply?
No, the SN74AS250ADWR is not rated for 3.3-V operation: its recommended VCC range is strictly 4.5 V to 5.5 V, and absolute maximum rating is 7 V. Applying 3.3 V falls below the minimum VIH threshold (2.0 V) and risks unreliable logic switching; for 3.3-V systems, TI recommends the CD74HC250E or SN74LVC250A instead of the SN74AS250ADWR.
SN74AS250ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Data Generator/Multiplexer
- Circuit:
- 1 x 16:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 15mA, 48mA
- 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:
- 24-SOIC
SN74AS250ADWR FAQ
1.How can I place an order for SN74AS250ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS250ADWR 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 SN74AS250ADWR reliable?
The price and inventory of SN74AS250ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS250ADWR is usually 5 days.
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Once your SN74AS250ADWR 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 SN74AS250ADWR?
For technical support, including SN74AS250ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS250ADWR requirements.
6.How does Aetrix verify that SN74AS250ADWR is sourced from the original manufacturer or authorized distributors?
All SN74AS250ADWR 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 SN74AS250ADWR meets industry standards.
7.What is the process for return or replacement of SN74AS250ADWR?
All SN74AS250ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS250ADWR, 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 SN74AS250ADWR part is unused and in its original packaging.
Return procedure for SN74AS250ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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