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Texas Instruments SN74AS253ANS
- Part No.:
- SN74AS253ANS
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74AS253ANS.pdf
- Description:
- MULTIPLEXER BIPOLAR 3-ST 8-IN 16
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Product details
Overview
SN74AS253ANS from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with independent 3-state outputs, operating at 4.5–5.5 V supply, delivering ±15 mA high-level and 48 mA low-level output drive, and supporting 0°C to 70°C industrial temperature range for bus-oriented digital systems.
For engineers reviewing the SN74AS253ANS datasheet, SN74AS253ANS pinout, SN74AS253ANS application, or SN74AS253ANS equivalent, key selection criteria include its dual-section independent enable control, sub-14 ns propagation delay (tPHL/tPLH), 3-state bus interface capability, and compatibility with TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V).
Technical Context
This device implements two independent 4:1 multiplexer sections sharing common select inputs (A, B), each with dedicated output-enable (1OE, 2OE) controlling high-impedance state on respective Y outputs. Logic decoding is performed via internal inverters, drivers, and AND-OR gates - no external decoding logic required.
Each section selects one of four data inputs (C0–C3) based on binary A/B address, while OE asserts low to enable output drive; when OE is high, output enters high-impedance state. Propagation delays are asymmetric: data-to-Y paths are faster (min 2.5 ns) than select-to-Y (min 3 ns), enabling precise timing in parallel-to-serial conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS bus systems without level-shifting. |
| Output Drive (IOL / IOH) | 48 mA sink / −15 mA source - directly drives multiple TTL loads or terminates stubs on shared data buses. |
| Propagation Delay (tPHL, tPLH) | ≤11.5 ns (select-to-Y), ≤7.5 ns (data-to-Y) - enables >70 MHz multiplexing in synchronous bus architectures. |
| Input Thresholds (VIH/VIL) | VIH = 2 V, VIL = 0.8 V - ensures reliable interfacing with legacy TTL and LVTTL logic families. |
| 3-State Enable Time (tPHZ/tPLZ) | tPHZ ≤ 6 ns, tPLZ ≤ 7 ns - supports rapid bus arbitration with minimal contention window during output transitions. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial embedded control applications with ambient thermal management. |
| Package | 16-pin plastic DIP (N) - through-hole mounting compatible with legacy PCB assembly and prototyping workflows. |
Pinout & Package
SN74AS253ANS is supplied in a 16-pin plastic dual in-line package (PDIP-N), 300-mil width, with 0.1-inch lead pitch and through-hole termination. Pin 1 is located at the top-left corner (notch side left), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1C0 | Data input 0 for first multiplexer section - connects to source signal selected when A=0, B=0. |
| 2 | 1C1 | Data input 1 for first section - active when A=0, B=1. |
| 3 | 1C2 | Data input 2 for first section - active when A=1, B=0. |
| 4 | 1C3 | Data input 3 for first section - active when A=1, B=1. |
| 5 | 1Y | Output of first multiplexer section - driven low/high or placed in high-Z per 1OE state. |
| 6 | 2C0 | Data input 0 for second multiplexer section - independent channel, same select logic. |
| 7 | 2C1 | Data input 1 for second section - shares A/B select lines but isolated data path and output. |
| 8 | GND | Ground reference - must be connected to system common return for stable logic thresholds and noise immunity. |
| 9 | 2Y | Output of second multiplexer section - independently enabled by 2OE; supports dual-bus routing. |
| 10 | 2C2 | Data input 2 for second section - enables identical 4:1 selection on second channel. |
| 11 | 2C3 | Data input 3 for second section - completes full dual 4-input set. |
| 12 | VCC | Positive supply - decoupling capacitor (0.1 µF) recommended adjacent to pin for transient current stability. |
| 13 | 1OE | Output-enable for first section - active-low; high = high-impedance, low = functional output drive. |
| 14 | 2OE | Output-enable for second section - independent control allows time-multiplexed or conditional bus access. |
| 15 | A | Common select bit 0 - shared by both sections; determines LSB of 2-bit address for C0–C3 selection. |
| 16 | B | Common select bit 1 - shared by both sections; determines MSB of 2-bit address for C0–C3 selection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Enables simultaneous routing of two separate 4-source data streams using shared address lines - reduces PCB routing complexity vs. discrete ICs. |
| Individual 3-state output enables (1OE/2OE) | Allows dynamic bus arbitration: one section can drive while the other is tri-stated, eliminating need for external bus buffers or direction control logic. |
| Sub-14 ns propagation delay | Supports high-speed data sampling in real-time control loops and digital test equipment where timing predictability is critical. |
| TTL-compatible input thresholds | Direct interface with legacy 74LS/74F logic without level translators - preserves signal integrity and simplifies mixed-family designs. |
| High-current 3-state outputs (48 mA sink) | Drives up to 10 standard TTL loads or sustains signal integrity across long traces in backplane or modular systems. |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Signal Routing |
|---|---|
|
Use Scenario: Expanding discrete input channels in programmable logic controllers using shared address/data buses. IC Role / Device Role / Timing Role: Dual multiplexer routes 8 field sensor inputs (4 per section) into two microcontroller ADC channels under software-selectable A/B address control. Use Value: Reduces component count by replacing two single 4:1 MUX ICs; independent OE pins allow staggered sampling to avoid bus contention during analog acquisition. |
Use Scenario: Switching between multiple calibration reference signals or stimulus sources in automated test systems. IC Role / Device Role / Timing Role: Selects one of four precision voltage references (per section) for DAC output verification, controlled by FPGA-generated A/B/OE signals. Use Value: Sub-8 ns data-path delay ensures minimal timing skew between reference selection and measurement capture, improving test repeatability. |
| Legacy Computer Bus Interface | Embedded System Parallel-to-Serial Conversion |
|
Use Scenario: Adapting modern peripherals to ISA or VMEbus architectures requiring 8-bit data multiplexing onto 16-bit data lanes. IC Role / Device Role / Timing Role: Routes two 4-bit nibbles (e.g., upper/lower byte) onto shared bus lines; OE signals synchronized to bus grant timing. Use Value: 48 mA drive strength maintains valid logic levels across extended bus lengths; 3-state isolation prevents back-driving during DMA cycles. |
Use Scenario: Converting parallel status bits from multiple sensors into serial stream for UART or SPI transmission in resource-constrained MCUs. IC Role / Device Role / Timing Role: Each section multiplexes 4 sensor flags; A/B toggled by MCU GPIO, outputs OR'd externally to form serial bitstream. Use Value: Independent OE control permits precise gating of output pulses - eliminates need for additional logic gates or software bit-banging overhead. |
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 |
|---|---|---|---|
| SN74ALS253N | Lower drive (24 mA sink), slower propagation (≤21 ns), higher ICC (12 mA active) | Compatible in static logic designs with relaxed speed/power budgets; not suitable for high-current bus loading. | Select when cost sensitivity outweighs performance needs and legacy ALS family compatibility is required. |
| SN74HC153N | CMOS process: 2 V–6 V supply, 4 mA drive, 23 ns max delay, lower ICC (<8 µA) | Requires level translation for TTL input compatibility; unsuitable for direct 5 V bus driving without buffers. | Choose only for low-power, wide-VCC applications where bus drive capability is delegated to external drivers. |
Compared with SN74ALS253N and SN74HC153N, SN74AS253ANS delivers superior speed and drive strength within the 5 V TTL ecosystem - making it the optimal choice for legacy bus interfaces and real-time signal routing where timing margin and load capacity are critical.
Availability
SN74AS253ANS is available at Aetrix Electronics and suitable for industrial PLC expansion, digital test equipment signal routing, legacy computer bus interface, embedded parallel-to-serial conversion, and real-time control subsystems requiring stable component supply across long-lifecycle programs.
Supply support for SN74AS253ANS 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.
SN74AS253ANS belongs to TI's advanced Schottky (AS) logic family, engineered for high-speed, high-drive digital interfacing in bus-oriented systems where propagation delay and output current are design-critical parameters.
FAQ
What logic family does SN74AS253ANS belong to, and how does it differ from standard TTL?
SN74AS253ANS is part of Texas Instruments' Advanced Schottky (AS) logic family. It differs from standard TTL by incorporating Schottky-clamped transistors that reduce saturation delay, achieving propagation delays under 14 ns and output drive up to 48 mA - significantly faster and more robust than 74LS or 74F variants while maintaining pin compatibility and TTL-level input thresholds.
Can SN74AS253ANS operate with a 3.3 V supply?
No, SN74AS253ANS is specified only for 4.5 V to 5.5 V operation per its recommended conditions. Applying 3.3 V violates the minimum VCC requirement and will result in unreliable logic thresholds, degraded noise margins, and potential failure to meet timing or drive specifications. For 3.3 V systems, consider CMOS alternatives like SN74LVC153, not SN74AS253ANS.
What is the function of the NC pins on SN74AS253ANS?
SN74AS253ANS has no NC (no-connect) pins in the N-package configuration. All 16 pins are assigned: pins 1–4, 6–7, 9–11, 13–16 are functional I/Os; pins 8 (GND) and 12 (VCC) are power terminals. The NC designation appears only in FK or J package variants - not applicable to SN74AS253ANS in PDIP-N.
How does the independent OE control benefit system design?
Independent 1OE and 2OE inputs allow SN74AS253ANS to manage two data paths without mutual interference - for example, enabling one section to drive a bus while the other remains high-Z during arbitration, or sequencing outputs to prevent simultaneous switching noise. This eliminates external gating logic and improves timing determinism in synchronous bus architectures.
Is SN74AS253ANS RoHS compliant?
Yes, SN74AS253ANS (orderable as SN74AS253ANE4) is RoHS-compliant with lead-free finish (CU NIPDAU) and meets JEDEC Level-1 moisture sensitivity requirements. TI's packaging documentation confirms Pb-Free (RoHS) status for this PDIP-N variant, suitable for environmentally regulated industrial manufacturing.
SN74AS253ANS 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:
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- Mounting Type:
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- Supplier Device Package:
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SN74AS253ANS FAQ
1.How can I place an order for SN74AS253ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS253ANS 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 SN74AS253ANS reliable?
The price and inventory of SN74AS253ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS253ANS is usually 5 days.
3.What payment methods are accepted for SN74AS253ANS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS253ANS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS253ANS?
SN74AS253ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS253ANS 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 SN74AS253ANS?
For technical support, including SN74AS253ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS253ANS requirements.
6.How does Aetrix verify that SN74AS253ANS is sourced from the original manufacturer or authorized distributors?
All SN74AS253ANS 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 SN74AS253ANS meets industry standards.
7.What is the process for return or replacement of SN74AS253ANS?
All SN74AS253ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS253ANS, 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 SN74AS253ANS part is unused and in its original packaging.
Return procedure for SN74AS253ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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