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Texas Instruments SN74AS353BDR
- Part No.:
- SN74AS353BDR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74AS353BDR.pdf
- Description:
- MUX, AS SERIES, 4 LINE INPUT TTL
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
SN74AS353BDR from Texas Instruments is a dual 4-line to 1-line inverting data selector/multiplexer with independent 3-state outputs and separate output-enable (OE) inputs per section. It operates at 4.5–5.5 V, delivers ±48 mA output drive, and supports bus-organized systems via high-impedance outputs. Used in parallel-to-serial conversion and multiplexing in TTL-compatible digital control logic.
For engineers reviewing the SN74AS353BDR datasheet, SN74AS353BDR pinout, SN74AS353BDR application, or SN74AS353BDR equivalent, key selection criteria include its dual-section architecture with independent OE control, 3-state output timing (tPZL ≤ 9 ns), AS-series propagation delay (tPLH ≤ 10 ns), and SOIC-16 package compatibility with legacy 74-series logic designs.
Technical Context
The SN74AS353BDR implements two independent 4:1 multiplexer sections sharing common select lines A and B, each with dedicated OE input controlling 3-state output Y. Its AND-OR-invert gate structure provides inverted output logic relative to selected data inputs.
Each section drives one output (1Y or 2Y) from four data inputs (1C0–1C3 or 2C0–2C3) under binary-select control. Output enable is active-low: OE = L enables output; OE = H places output in high-impedance state. Propagation delays are specified for both select-to-output (A/B → Y) and data-to-output (Cn → Y) paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL systems and noise margin compliance. |
| Output Drive | IOL = 48 mA / IOH = −15 mA - sufficient to directly drive multiple TTL loads without external buffers. |
| Propagation Delay | tPLH ≤ 10 ns (A/B → Y) - enables high-speed data routing in synchronous digital systems up to ~100 MHz. |
| 3-State Enable Time | tPZL ≤ 9 ns - allows rapid bus arbitration and minimizes contention windows during output switching. |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded and industrial control environments. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - matches standard TTL voltage levels for seamless interfacing with legacy logic families. |
| Quiescent Current | ICC = 18–31 mA (all outputs disabled) - defines static power budget in idle bus states. |
Pinout & Package
SN74AS353BDR is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm × 7.5 mm body size, and gull-wing leads. Pinout conforms to TI standard D-package top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1OE, 2OE | Active-low output enable for Section 1 and Section 2 - controls 3-state behavior independently. |
| 2, 14 | B, A | Common binary select inputs - determine which of four data inputs (C0–C3) routes to output Y per section. |
| 3–6, 10–13 | 1C0–1C3, 2C0–2C3 | Data inputs - inverted selection logic means output Y = NOT(selected Cn). |
| 7, 9 | 1Y, 2Y | Inverted multiplexed outputs - 3-state capable, driven low/high or placed in high-Z based on OE state. |
| 8 | GND | Ground reference - required for logic threshold stability and current return path. |
| 16 | VCC | Positive supply - powers internal inverters, drivers, and AND-OR-invert gates. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexer sections | Enables two simultaneous data routing paths using shared select lines-reduces control logic overhead in multi-channel systems. |
| Separate active-low OE per section | Allows selective bus driving: one section drives while the other remains high-Z-critical for bidirectional bus arbitration. |
| Inverting output logic | Provides complementary signal polarity without external inverters-simplifies level-shifting in mixed-logic designs. |
| AS-series speed grade | Delivers faster propagation (vs. ALS/LS) and higher drive strength-supports tighter timing budgets in high-throughput digital controllers. |
| SOIC-16 package | Offers surface-mount compatibility with automated assembly while maintaining pinout equivalence to through-hole N-package variants. |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Expanding discrete input monitoring across multiple sensor banks in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Dual-section multiplexer selects among 8 sensor inputs (4 per section), feeding consolidated data to a microcontroller ADC interface. Use Value: Reduces microcontroller GPIO count by 6 pins and eliminates need for external address decoding logic. | Use Scenario: Dynamic reconfiguration of stimulus/sense paths in automated test equipment for IC functional validation. IC Role / Device Role / Timing Role: Routes calibrated reference voltages or test signals from one of four sources to DUT input pins under software control. Use Value: Enables sub-10 ns signal path switching without bus contention, supporting high-speed parametric testing sequences. |
| Legacy Bus Interface Adapter | Parallel-to-Serial Data Converter |
Use Scenario: Bridging 8-bit parallel data from an older microprocessor to a modern serial peripheral requiring time-multiplexed input. IC Role / Device Role / Timing Role: Converts parallel byte-wide data into time-division multiplexed bit streams using clock-synchronized select lines. Use Value: Maintains full 5-V TTL compatibility and drive strength while avoiding level translators or FPGA glue logic. | Use Scenario: Serializing parallel status flags from multiple subsystems (e.g., power rails, thermal sensors, watchdogs) onto a shared diagnostic bus. IC Role / Device Role / Timing Role: Performs synchronous parallel-to-serial conversion using external clock-driven A/B select sequencing. Use Value: Achieves deterministic serialization latency (<10 ns per bit) with no added jitter from internal PLLs or FIFOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS353BDR | ALS-family variant: slower tPLH (15 ns max), lower IOL (24 mA), reduced ICC (12–20 mA). | Lower power and cost; suitable where timing margins exceed 15 ns and drive load ≤ 2 TTL units. | Choose when system clock rate < 30 MHz and thermal/power constraints dominate speed requirements. |
| SN74F353N | F-family: faster tPLH (8 ns max) but only available in PDIP-16; no SOIC option; higher ICC (25–40 mA). | Requires through-hole assembly; better for prototyping or legacy board rework where SOIC footprint is unavailable. | Choose for breadboard evaluation or replacement on existing DIP-based systems needing marginal speed gain over AS-series. |
Compared with SN74ALS353BDR and SN74F353N, the SN74AS353BDR delivers optimal balance of speed (≤10 ns), drive strength (48 mA), and SOIC-16 availability-making it preferred for space-constrained, high-drive commercial digital control boards.
Availability
SN74AS353BDR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment signal routing, and legacy bus interface adapter designs requiring stable component supply and verified 5-V TTL interoperability.
Supply support for SN74AS353BDR 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 SN74AS353BDR belongs to TI's 74AS advanced Schottky logic family, designed for high-speed, high-drive digital control applications where propagation delay and fanout capability are critical in 5-V systems.
FAQ
What is the logic polarity of the SN74AS353BDR outputs?
The SN74AS353BDR provides inverted outputs: Y = NOT(Cn), where n is selected by A and B. This is inherent to its AND-OR-invert gate architecture. The SN74AS353BDR does not offer non-inverting output variants in the same package; designers must account for inversion in upstream/downstream logic or add external inverters if needed.
Can the SN74AS353BDR operate at 3.3 V?
No, the SN74AS353BDR is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V TTL compatibility. Operating below 4.5 V risks incorrect logic levels, increased propagation delay, and potential failure to meet IOL/IOH specs. Use 74LVC or 74AUC series for 3.3-V applications.
Does the SN74AS353BDR support hot insertion or live bus swapping?
The SN74AS353BDR has no built-in hot-swap protection. Its absolute maximum rating for voltage on disabled 3-state outputs is 5.5 V, and it lacks bus-hold or power-up 3-state features. For live bus applications, external series resistors and careful sequencing of VCC/OE activation are required. The SN74AS353BDR should be powered and enabled before connecting to an active bus.
How are the select inputs A and B shared between sections?
A and B are physically common pins (pins 14 and 2) shared by both multiplexer sections. This architecture allows synchronized selection across both 4-input groups using identical address bits-ideal for interleaved or mirrored data routing. The SN74AS353BDR does not support independent select control per section; separate addressing requires additional logic or a different device such as two discrete 74AS157s.
Is the SN74AS353BDR pin-compatible with the SN74AS253?
No. Although the SN74AS353BDR is described as the inverting version of the ′AS253, they differ in function and pinout. The SN74AS253 is a single 8:1 multiplexer with three select lines (A, B, C); the SN74AS353BDR is a dual 4:1 with two shared select lines (A, B) and two OE inputs. Their pin assignments, terminal counts, and logic functions are incompatible-direct replacement is not possible without PCB redesign.
SN74AS353BDR 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:
- -
SN74AS353BDR FAQ
1.How can I place an order for SN74AS353BDR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS353BDR 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 SN74AS353BDR reliable?
The price and inventory of SN74AS353BDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS353BDR is usually 5 days.
3.What payment methods are accepted for SN74AS353BDR?
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4.How is shipping managed for SN74AS353BDR?
SN74AS353BDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS353BDR 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 SN74AS353BDR?
For technical support, including SN74AS353BDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS353BDR requirements.
6.How does Aetrix verify that SN74AS353BDR is sourced from the original manufacturer or authorized distributors?
All SN74AS353BDR 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 SN74AS353BDR meets industry standards.
7.What is the process for return or replacement of SN74AS353BDR?
All SN74AS353BDR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS353BDR, 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 SN74AS353BDR part is unused and in its original packaging.
Return procedure for SN74AS353BDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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