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Texas Instruments SN74AS353BD
- Part No.:
- SN74AS353BD
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74AS353BD.pdf
- Description:
- MUX, AS SERIES, 4 LINE INPUT TTL
- Quantity:
- Payment:
- Shipping:
Inventory:3,699
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Product details
Overview
SN74AS353BD from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with independent 3-state outputs, inverting logic, 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 tri-state control. Used in parallel-to-serial conversion and multiplexing in TTL-compatible industrial control backplanes.
For engineers reviewing the SN74AS353BD datasheet, SN74AS353BD pinout, SN74AS353BD application, or SN74AS353BD equivalent, this page provides verified functional identity, validated timing specs (tPLH ≤ 10 ns), confirmed 16-pin SOIC (D) package mapping, and two field-validated alternative parts for legacy system maintenance and redesign.
Technical Context
The SN74AS353BD implements two independent 4:1 multiplexer sections sharing common select inputs A and B, each with dedicated OE control and inverted AND-OR-invert logic. Each section selects one of four data inputs (C0–C3) based on binary A/B state and drives a single inverted output (1Y or 2Y) in active-low or high-impedance mode.
It uses advanced Schottky (AS) bipolar technology for TTL-compatible voltage levels, 3-state bus interface capability, and propagation delays as low as 1 ns (tPHL on data inputs). Output enable timing (tPZH/tPLZ ≤ 6 ns) ensures precise bus arbitration in synchronous data routing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS - Advanced Schottky TTL, compatible with standard TTL input thresholds and output drive |
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across industrial power rail tolerances |
| Output Drive | IOL = 48 mA / IOH = −15 mA - Sufficient to directly drive multiple TTL loads without buffering |
| Propagation Delay | tPLH ≤ 10 ns (A/B→Y), tPHL ≤ 9 ns - Enables reliable operation in sub-100 MHz address/data multiplexing |
| Enable Timing | tPZH ≤ 6 ns, tPZL ≤ 5 ns - Supports tight bus turnaround windows in shared-data-path systems |
| Operating Temp | 0°C to 70°C - Qualified for commercial-grade embedded and instrumentation environments |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - Matches standard TTL noise margin requirements |
Pinout & Package
SN74AS353BD is housed in a 16-pin plastic small-outline integrated circuit (SOIC) package (Package Drawing D), 7.5 mm wide, with 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low output enable for Section 1 - Drives 1Y to high-Z when high |
| 2 | B | Common select bit (MSB) for both sections - Determines upper/lower half of 4-input selection |
| 3 | 1C3 | Data input 3 (MSB) for Section 1 - Inverted and gated into Section 1's AND-OR-invert tree |
| 4 | 1C2 | Data input 2 for Section 1 - Directly routed to internal decoding logic |
| 5 | 1C1 | Data input 1 for Section 1 - One of four parallel inputs selected by A/B |
| 6 | 1C0 | Data input 0 (LSB) for Section 1 - LSB of 4-bit data bus fed to first multiplexer |
| 7 | 1Y | Inverted 4:1 multiplexed output for Section 1 - Tri-stated when 1OE = H |
| 8 | GND | Ground reference - Shared return path for all internal logic and output drivers |
| 9 | 2Y | Inverted 4:1 multiplexed output for Section 2 - Independent of 1Y; tri-stated when 2OE = H |
| 10 | 2C0 | Data input 0 (LSB) for Section 2 - LSB of second 4-bit data bus |
| 11 | 2C1 | Data input 1 for Section 2 - Parallel input to second independent multiplexer |
| 12 | 2C2 | Data input 2 for Section 2 - Matches pinout symmetry with Section 1 |
| 13 | 2C3 | Data input 3 (MSB) for Section 2 - MSB of second 4-bit data source |
| 14 | A | Common select bit (LSB) for both sections - Paired with B to generate 2-bit select code |
| 15 | 2OE | Active-low output enable for Section 2 - Fully independent control of 2Y high-Z state |
| 16 | VCC | +5 V supply - Powers all internal gates, inverters, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Enables simultaneous routing of two separate 4-bit data streams without crosstalk or shared control latency |
| Separate 3-state output enables (1OE/2OE) | Allows interleaved bus access - one section drives while the other is high-Z, eliminating contention |
| Inverting output logic | Provides inherent signal inversion within multiplexing path, reducing need for external inverters in complement-sensitive designs |
| AS-series speed and drive | Delivers 10 ns max propagation delay and 48 mA sink current - exceeds standard 74LS performance for legacy system upgrades |
| TTL-compatible input/output thresholds | Ensures plug-in compatibility with existing 74xx and 74LS-based boards without level-shifting circuitry |
Applications
| Industrial Backplane Multiplexing | Legacy Test Equipment Data Routing |
|---|---|
|
Use Scenario: Selecting among four sensor channels on a modular PLC I/O rack before serializing to a central controller. IC Role / Device Role / Timing Role: Dual-section SN74AS353BD routes analog-to-digital converted data streams independently while maintaining channel isolation and timing coherence. Use Value: Eliminates need for discrete gating logic; 10 ns propagation enables sampling at >50 MSPS-equivalent effective rate in time-division-multiplexed architectures. |
Use Scenario: Switching between four calibration reference voltages during automated test sequence execution in benchtop DMMs. IC Role / Device Role / Timing Role: Acts as precision analog multiplexer front-end - enabled only during stable reference settling windows using synchronized OE control. Use Value: 48 mA sink capability drives low-impedance DAC reference buffers directly; independent OE pins allow staggered enable timing to minimize supply transient coupling. |
| Parallel-to-Serial Conversion | TTL Bus Arbitration Logic |
|
Use Scenario: Converting 4-bit status words from distributed controllers into a time-multiplexed serial stream for host microcontroller polling. IC Role / Device Role / Timing Role: Performs hardware-level parallel-to-serial translation using A/B select sequencing and clock-synchronized OE toggling. Use Value: Reduces host GPIO count by 3 per remote node; AS-speed ensures full 4-bit word transfer completes within one 100 ns CPU bus cycle. |
Use Scenario: Managing shared data bus access among three peripheral modules in an 8-bit microcomputer system with no bus controller. IC Role / Device Role / Timing Role: Provides priority-encoded bus grant logic - each module asserts request, SN74AS353BD selects highest-priority active input onto bus. Use Value: Tri-state outputs prevent bus contention; 6 ns enable/disable times support sub-microsecond arbitration cycles without external latches. |
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 |
|---|---|---|---|
| SN74ALS353BN | ALS-family variant: slower (tPLH ≤ 15 ns), lower IOL (24 mA), same pinout and function | Lower power consumption (ICC ≈ 19 mA vs. 24 mA), suitable where speed margin allows | Select when thermal budget or static power is constrained and 15 ns delay is acceptable |
| SN74F353N | F-family: faster (tPLH ≤ 7 ns), higher ICC (35 mA), identical pinout and logic function | Higher drive (IOL = 64 mA) but increased noise sensitivity and supply current | Choose for maximum speed-critical paths where board-level noise mitigation is implemented |
Compared with SN74AS353BD, SN74ALS353BN trades speed for lower power and SN74F353N increases speed at the cost of higher supply current and noise susceptibility - all share identical pinout, logic truth table, and bus-interface behavior, enabling direct substitution in most legacy PCB layouts.
Availability
SN74AS353BD is available at Aetrix Electronics and suitable for industrial backplane multiplexing, legacy test equipment data routing, and parallel-to-serial conversion requiring stable component supply amid long-lifecycle system support.
Supply support for SN74AS353BD 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 global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74AS353BD belongs to TI's 74AS logic family - engineered for high-speed, TTL-compatible digital routing in legacy and upgrade systems where reliability, timing predictability, and bus-driving strength are critical.
FAQ
What is the logic function of the SN74AS353BD?
The SN74AS353BD implements two independent inverting 4-line to 1-line data selectors. Each section accepts four data inputs (C0–C3), two common select lines (A and B), and one dedicated output-enable (OE); it outputs the inverted selected input on Y. The function matches the standard 74x353 truth table with active-low enable and inverted output polarity. This behavior is confirmed in the SDAS222A datasheet function table and logic diagram.
Is SN74AS353BD pin-compatible with SN74ALS353BN?
Yes, SN74AS353BD is pin-compatible with SN74ALS353BN - both use identical 16-pin DIP (N) or SOIC (D) footprints, share identical pin assignments (including 1OE, 2OE, A, B, C0–C3, Y outputs, VCC, GND), and implement the same logic function. The difference lies solely in speed, drive strength, and power consumption - not pinout or interface behavior.
What is the maximum operating frequency supported by SN74AS353BD?
SN74AS353BD does not specify a maximum clock frequency, but its propagation delays (tPLH ≤ 10 ns, tPHL ≤ 9 ns) and enable/disable times (tPZH ≤ 6 ns) support reliable operation in systems with data valid windows ≥ 15 ns. In practice, it functions correctly in 50–66 MHz bus multiplexing applications when used with appropriate setup/hold timing margins, as verified in TI's switching characteristics test conditions.
Does SN74AS353BD support mixed-voltage interfacing?
No, SN74AS353BD is strictly a 5 V TTL device - it requires VCC = 4.5–5.5 V and has input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output levels (VOH ≥ 2.4 V, VOL ≤ 0.5 V) defined only for 5 V operation. It does not support 3.3 V or 2.5 V logic families natively; level-shifting circuitry is required for interfacing with lower-voltage systems.
What is the status of SN74AS353BD according to Texas Instruments?
Texas Instruments lists SN74AS353BD as OBSOLETE in its official packaging information - meaning production has been discontinued. However, Aetrix Electronics maintains traceable inventory and offers lifecycle support including obsolescence forecasting, cross-reference assistance, and controlled distribution for legacy system repair and sustainment programs involving SN74AS353BD.
SN74AS353BD 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:
- -
SN74AS353BD FAQ
1.How can I place an order for SN74AS353BD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS353BD 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 SN74AS353BD reliable?
The price and inventory of SN74AS353BD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS353BD is usually 5 days.
3.What payment methods are accepted for SN74AS353BD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS353BD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS353BD?
SN74AS353BD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS353BD 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 SN74AS353BD?
For technical support, including SN74AS353BD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS353BD requirements.
6.How does Aetrix verify that SN74AS353BD is sourced from the original manufacturer or authorized distributors?
All SN74AS353BD 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 SN74AS353BD meets industry standards.
7.What is the process for return or replacement of SN74AS353BD?
All SN74AS353BD units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS353BD, 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 SN74AS353BD part is unused and in its original packaging.
Return procedure for SN74AS353BD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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