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Texas Instruments SN74LS253NSR
- Part No.:
- SN74LS253NSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS253NSR.pdf
- Description:
- IC MULTIPLEXER 2 X 4:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,018
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Product details
Overview
SN74LS253NSR from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer in a 16-pin plastic DIP package, operating at 0°C to 70°C, with typical propagation delay of 15 ns and supply current of 19 mA, used for digital signal routing in TTL-based control logic and address decoding.
For engineers reviewing the SN74LS253NSR datasheet, SN74LS253NSR pinout, SN74LS253NSR application, or SN74LS253NSR equivalent, key selection criteria include its dual independent 4:1 multiplexing capability, TTL-compatible input thresholds, guaranteed fan-out of 10 LS-TTL loads, and compatibility with legacy 74LS family timing and voltage margins.
Technical Context
The SN74LS253NSR implements two identical 4-input, single-output multiplexers sharing common select (S0, S1) and strobe (1G, 2G) controls. Each section routes one of four data inputs (1A0–1A3 or 2A0–2A3) to its output (1Y or 2Y) based on binary select code and active-low enable state.
It uses bipolar Schottky TTL technology, ensuring compatible voltage levels (VIH = 2.0 V min, VIL = 0.8 V max), noise immunity of 0.4 V, and direct interfacing with 74LS, 74S, and 74 series outputs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS TTL - ensures interoperability with legacy TTL systems and predictable DC/AC behavior under standard load conditions. |
| Propagation Delay | 15 ns max (tpd) - defines worst-case signal routing latency between input change and valid output transition at VCC = 5 V. |
| Supply Current | 19 mA max (ICC) - determines power budget per device in dense logic arrays and thermal loading in through-hole PCB layouts. |
| Fan-Out | 10 LS-TTL loads - specifies maximum number of downstream 74LS inputs that can be driven without signal degradation. |
| Operating Temperature | 0°C to 70°C - confirms commercial-grade suitability for non-military, non-automotive indoor electronics environments. |
| Input Voltage Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees reliable logic-level recognition across voltage tolerances and board-level noise margins. |
Pinout & Package
SN74LS253NSR is supplied in a 16-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, with 0.100-inch lead pitch and through-hole mounting configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Section 1 Data Inputs (1A0–1A3) | Four parallel digital inputs routed to output 1Y when enabled and selected. |
| 5, 6 | Select Lines (S0, S1) | Binary code (S1S0) determines which of the four inputs passes to the output (00→A0, 01→A1, etc.). |
| 7 | Section 1 Strobe (1G) | Active-low enable: output 1Y = high-impedance unless 1G = LOW and section is selected. |
| 8 | GND | Power ground reference for all internal circuitry and I/O pins. |
| 9, 10, 11, 12 | Section 2 Data Inputs (2A0–2A3) | Independent set of four inputs for second multiplexer channel. |
| 13 | Section 2 Strobe (2G) | Active-low enable for second multiplexer; decouples control of two sections. |
| 14 | VCC | +5 V DC supply for TTL operation; must be bypassed locally with 0.1 µF ceramic capacitor. |
| 15 | Output 2Y | Inverted-pass-through output of Section 2; reflects selected input when 2G = LOW. |
| 16 | Output 1Y | Inverted-pass-through output of Section 1; reflects selected input when 1G = LOW. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Enables compact implementation of two separate data-routing paths using shared select lines and discrete enables. |
| Common select bus (S0/S1) | Reduces control wiring count by allowing synchronized selection across both sections without additional logic. |
| Individual strobe inputs (1G/2G) | Permits selective activation or isolation of each multiplexer channel-critical for time-multiplexed bus arbitration. |
| TTL-compatible input/output levels | Eliminates need for level translators when interfacing with 74LS, 74S, or microcontroller GPIOs operating at 5 V. |
| Guaranteed AC/DC specifications over temperature | Ensures deterministic timing and logic behavior across full commercial temperature range without derating. |
Applications
| Address Decoding | Bus Multiplexing |
|---|---|
Use Scenario: Selecting among multiple memory or peripheral chip-select lines in an 8-bit microprocessor system with limited address lines. IC Role / Device Role / Timing Role: Dual 4:1 multiplexer maps 2-bit select code to one of four CS outputs while enabling/disabling sections independently. Use Value: Reduces external gating logic by half compared to single-mux solutions, minimizing propagation delay in critical address path. | Use Scenario: Sharing a single data bus between four sensor interfaces in a programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Routes analog-to-digital converter outputs or digital status signals onto common bus under microcontroller command. Use Value: Provides deterministic, glitch-free bus access with no contention-strobe control prevents floating outputs during switching. |
| Test Equipment Signal Routing | Legacy System Logic Expansion |
Use Scenario: Configurable signal path selection in automated test equipment (ATE) for routing calibration references or stimulus signals. IC Role / Device Role / Timing Role: Acts as reconfigurable interconnect node controlled via front-panel DIP switches or firmware-driven GPIOs. Use Value: Enables hardware-defined test sequences without FPGA or CPLD involvement-low-latency, deterministic routing. | Use Scenario: Adding I/O expansion capability to vintage 8-bit computers or industrial controllers using original 74LS architecture. IC Role / Device Role / Timing Role: Integrates seamlessly into existing 74LS-based glue logic with identical timing, drive strength, and voltage thresholds. Use Value: Preserves system timing budgets and eliminates redesign risk-drop-in replacement for obsolete 74LS253 variants. |
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 |
|---|---|---|---|
| SN74LS153N | Identical pinout, function, and electrical specs; same 16-pin PDIP package and 74LS process. | No functional or timing difference; fully interchangeable in all designs using SN74LS253NSR. | Select SN74LS153N when seeking second-source availability or alternate logistics channel with identical form-fit-function. |
| SN74HC153N | CMOS technology: higher noise immunity, wider VCC range (2–6 V), but slower propagation (21 ns typ), lower drive (74HC vs 74LS fan-out). | Requires level translation if interfacing with legacy 74LS outputs; unsuitable where strict 74LS timing or drive is required. | Choose SN74HC153N only in new designs targeting lower power or mixed-voltage operation-not for drop-in replacement. |
Compared with SN74LS153N, SN74LS253NSR offers identical performance and compatibility; versus SN74HC153N, it delivers faster speed and guaranteed TTL drive but lacks voltage flexibility and consumes more static current.
Availability
SN74LS253NSR is available at Aetrix Electronics and suitable for address decoding, bus multiplexing, test equipment signal routing, and legacy system logic expansion requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS253NSR 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 ICs with broad industrial and automotive portfolio coverage.
The SN74LS253NSR belongs to TI's legacy 74LS logic family, designed specifically for robust, low-cost, high-speed digital control and data routing in commercial-grade systems from the 1970s onward.
FAQ
What is the function of the strobe inputs (1G and 2G) on the SN74LS253NSR?
The strobe inputs 1G and 2G are active-low enables for each of the two independent 4:1 multiplexers inside the SN74LS253NSR. When 1G is HIGH, output 1Y enters high-impedance state regardless of select inputs; only when 1G is LOW does 1Y reflect the selected input. This allows independent gating of each section, supporting time-shared or conditional routing without external logic.
Is SN74LS253NSR pin-compatible with SN74LS153N?
Yes, SN74LS253NSR is fully pin-compatible and functionally identical to SN74LS153N: same 16-pin PDIP package, identical pin assignments, matching AC/DC electrical specifications, and identical truth table behavior. Both parts share the same TI datasheet (SDLS147) and may be substituted without layout or firmware changes.
What is the maximum propagation delay for SN74LS253NSR at 5 V and 25°C?
The maximum propagation delay (tpd) for SN74LS253NSR is 15 ns under standard test conditions (VCC = 5 V, TA = 25°C, CL = 15 pF). This value applies to both sections and covers the worst-case path from any data or select input to the corresponding output, as specified in the SDLS147 datasheet revision March 1988.
Can SN74LS253NSR operate with a 3.3 V supply?
No, SN74LS253NSR is not rated for 3.3 V operation. It is a bipolar TTL device requiring VCC = 5 V ± 5% (4.75 V to 5.25 V) to meet guaranteed logic thresholds, fan-out, and timing specifications. Operation below 4.75 V risks incorrect logic states, increased propagation delay, or failure to drive downstream TTL loads reliably.
Does SN74LS253NSR support hot insertion or live insertion into a powered system?
No, SN74LS253NSR does not support hot insertion. As a standard 74LS TTL device, it lacks bus-hold, power-up reset, or Ioff protection features. Applying signals before VCC stabilization or removing the device while powered risks latch-up, output contention, or permanent damage due to uncontrolled current paths.
SN74LS253NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Multiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 2.6mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74LS253NSR FAQ
1.How can I place an order for SN74LS253NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS253NSR 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 SN74LS253NSR reliable?
The price and inventory of SN74LS253NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS253NSR is usually 5 days.
3.What payment methods are accepted for SN74LS253NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS253NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS253NSR?
SN74LS253NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS253NSR 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 SN74LS253NSR?
For technical support, including SN74LS253NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS253NSR requirements.
6.How does Aetrix verify that SN74LS253NSR is sourced from the original manufacturer or authorized distributors?
All SN74LS253NSR 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 SN74LS253NSR meets industry standards.
7.What is the process for return or replacement of SN74LS253NSR?
All SN74LS253NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS253NSR, 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 SN74LS253NSR part is unused and in its original packaging.
Return procedure for SN74LS253NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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