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Texas Instruments SN74LS253N
- Part No.:
- SN74LS253N
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS253N.pdf
- Description:
- IC MULTIPLEXER 2 X 4:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:728
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Product details
Overview
SN74LS253N from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer in a 16-pin PDIP 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 SN74LS253N datasheet, SN74LS253N pinout, SN74LS253N application, or SN74LS253N equivalent, this page delivers verified functional identity, validated pin assignments, confirmed timing parameters, and real-world use context for legacy TTL system design and replacement sourcing.
Technical Context
The SN74LS253N implements two independent 4:1 multiplexers sharing common select (S0, S1) and strobe (G̅) inputs, each with complementary outputs (Y and Y̅), enabling simultaneous selection of one of four data sources per channel. It uses bipolar Schottky TTL technology for noise immunity and speed.
Input compatibility includes standard TTL logic levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V), output drive capability supports fan-out of 20 LS-TTL loads, and the active-low strobe enables synchronous gating across both multiplexers without internal state retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures interoperability with 74LS-series components and lower power than standard TTL. |
| Propagation Delay | 15 ns max (tPLH/tPHL) - defines worst-case signal routing latency in synchronous control paths. |
| Supply Voltage | VCC = 4.75–5.25 V - requires tightly regulated +5 V rail; not tolerant of wider voltage ranges. |
| Operating Temperature | 0°C to +70°C - commercial-grade rating; excludes extended industrial or military temperature operation. |
| Output Drive | IOH/IOL = –0.4 mA / 8 mA - sufficient to drive 20 LS-TTL inputs but insufficient for direct LED or relay loads. |
| Power Dissipation | 19 mA typical ICC - translates to ~95 mW at 5 V, critical for thermal budgeting in dense TTL backplanes. |
Pinout & Package
SN74LS253N is housed 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. Pin 1 is marked by a notch or dot at the top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Data Inputs A (I0A–I3A) | Four independent digital inputs for first multiplexer channel; routed to YA/ȲA based on S0/S1. |
| 5, 6 | Select Inputs (S0, S1) | Binary address lines determining which of four data inputs passes to output (00→I0, 11→I3). |
| 7 | Strobe Input (G̅) | Active-low enable; forces both Y outputs low when high, overriding select logic. |
| 8 | GND | Signal and power reference ground for all internal circuitry and I/O. |
| 9, 10 | Outputs A (YA, ȲA) | True and complemented outputs of first 4:1 mux; YA = selected input when G̅ = low. |
| 11, 12, 13, 14 | Data Inputs B (I0B–I3B) | Second set of four inputs, sharing S0/S1/G̅ with Channel A for synchronized selection. |
| 15, 16 | Outputs B (YB, ȲB) | True/complement outputs of second mux; identical timing and loading behavior as Channel A. |
| 16 | VCC | +5 V supply connection; decoupling capacitor required within 1 cm for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Reduces component count in systems requiring parallel data routing, e.g., dual-bus arbitration or mirrored I/O control. |
| Common select and strobe inputs | Enables synchronized channel selection and blanking-critical for time-aligned sampling or display multiplexing. |
| Complementary outputs (Y and Y̅) | Eliminates need for external inverters in differential signaling or enable/disable logic trees. |
| TTL-compatible input thresholds | Interoperates directly with 74LS, 74S, and 74F families without level-shifting circuitry. |
| Low-power Schottky construction | Reduces static power vs. standard TTL while maintaining speed-key for board-level power density constraints. |
Applications
| Microprocessor Address Decoding | Industrial PLC I/O Multiplexing |
|---|---|
Use Scenario: Selecting between multiple memory-mapped peripherals using upper address bits. IC Role / Device Role / Timing Role: Dual-channel address decoder that routes A0–A1 to select one of four register banks per interface. Use Value: Enables compact 8-bit microcontroller systems to manage 16+ peripheral devices using only two address lines and shared strobe control. | Use Scenario: Consolidating discrete sensor inputs into a single analog-to-digital converter channel via time-division sampling. IC Role / Device Role / Timing Role: Digital switch controlling which of four analog front-end channels connects to ADC input under PLC scan-cycle timing. Use Value: Reduces PCB area and BOM cost versus four dedicated ADC interfaces while preserving deterministic sampling order. |
| Legacy Test Equipment Signal Routing | Avionics Panel Display Scanning |
Use Scenario: Switching calibration reference signals into measurement circuits during automated self-test sequences. IC Role / Device Role / Timing Role: Precision-controlled signal path selector triggered by test controller's strobe and address bus. Use Value: Provides repeatable, glitch-free signal routing essential for metrology-grade accuracy in benchtop instruments. | Use Scenario: Driving segmented LED displays in cockpit panels where multiple digit drivers share a common anode driver. IC Role / Device Role / Timing Role: Synchronizing digit-enable signals across four display positions using shared select/strobe timing. Use Value: Ensures uniform brightness and flicker-free operation by guaranteeing identical propagation delay across all digit channels. |
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 DC/AC specs; same LS-TTL process and timing. | No functional difference; SN74LS153N is the industry-standard designation for this device. | Select SN74LS153N when sourcing from distributors listing it as primary part number; fully interchangeable with SN74LS253N. |
| SN74HC153N | CMOS technology, wider VCC range (2–6 V), lower ICC (< 8 µA), but slower tpd (24 ns typ at 4.5 V). | Requires level translation if interfacing with legacy TTL logic; unsuitable for high-speed TTL backplanes. | Choose SN74HC153N only for new low-power designs with mixed-voltage domains and relaxed timing budgets. |
Compared with SN74LS153N (pin-identical drop-in) and SN74HC153N (CMOS alternative), SN74LS253N delivers guaranteed LS-TTL timing and drive strength for legacy system repair and backward-compatible upgrades without layout change or logic redesign.
Availability
SN74LS253N is available at Aetrix Electronics and suitable for industrial control systems, legacy test equipment refurbishment, and aerospace avionics maintenance programs requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74LS253N 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, automotive, and defense product portfolios.
The SN74LS253N belongs to TI's legacy 74LS logic family, designed specifically for high-reliability, medium-speed digital control systems where compatibility with existing TTL infrastructure and predictable timing behavior are mandatory.
FAQ
What is the function of the SN74LS253N?
The SN74LS253N is a dual 4-line to 1-line data selector/multiplexer with complementary outputs and a common strobe input. It routes one of four digital inputs per channel to its respective output based on binary select lines S0 and S1, enabling synchronized data path control in TTL-based systems. Its architecture is fixed and does not support latching or three-state outputs.
Is SN74LS253N pin-compatible with SN74LS153N?
Yes, SN74LS253N is functionally and pinout-identical to SN74LS153N. Both share the same 16-pin PDIP package, identical pin assignments, electrical specifications, and timing characteristics. The SN74LS253N designation appears in certain TI documentation variants, but SN74LS153N remains the canonical part number for this device across distributor catalogs and cross-reference databases.
What is the maximum clock or data rate supported by SN74LS253N?
The SN74LS253N does not operate on a clock signal-it is asynchronous. Its usable data rate is governed by propagation delay (15 ns max) and setup/hold timing (20 ns min S0/S1 hold before G̅ assertion). In practice, reliable operation is achieved up to approximately 30 MHz toggle rate on select lines when driving light loads, assuming clean edges and proper decoupling.
Can SN74LS253N drive LEDs directly?
No, SN74LS253N cannot drive standard LEDs directly. Its output sink current is rated at 8 mA (min), which may be insufficient for visible brightness in most indicator LEDs, and it lacks current-limiting capability. External driver transistors or dedicated LED driver ICs are required. Additionally, the SN74LS253N has no open-collector or high-current output configuration.
Does SN74LS253N support three-state outputs?
No, SN74LS253N does not provide three-state (high-impedance) outputs. Its outputs are strictly push-pull TTL: Y drives high or low actively, and Ȳ provides the logical inverse. To isolate outputs on a shared bus, external tri-state buffers or discrete gating logic must be added-this is a fundamental architectural limitation of the SN74LS253N design.
SN74LS253N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74LS253N FAQ
1.How can I place an order for SN74LS253N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS253N 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 SN74LS253N reliable?
The price and inventory of SN74LS253N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS253N is usually 5 days.
3.What payment methods are accepted for SN74LS253N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS253N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS253N?
SN74LS253N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS253N 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 SN74LS253N?
For technical support, including SN74LS253N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS253N requirements.
6.How does Aetrix verify that SN74LS253N is sourced from the original manufacturer or authorized distributors?
All SN74LS253N 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 SN74LS253N meets industry standards.
7.What is the process for return or replacement of SN74LS253N?
All SN74LS253N units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS253N, 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 SN74LS253N part is unused and in its original packaging.
Return procedure for SN74LS253N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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