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Texas Instruments SN74ALS253DR
- Part No.:
- SN74ALS253DR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ALS253DR.pdf
- Description:
- IC MULTIPLEXER 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ALS253DR from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with independent 3-state outputs, designed for bus-organized digital systems. It features two independent 4-input sections (1C0–1C3 and 2C0–2C3), common select lines (A/B), individual output-enable inputs (1OE/2OE), and operates at 4.5–5.5 V over 0°C to 70°C. Used in parallel-to-serial conversion and data routing in TTL-compatible logic systems.
For engineers reviewing the SN74ALS253DR datasheet, SN74ALS253DR pinout, SN74ALS253DR application, or SN74ALS253DR equivalent, key selection criteria include its dual-section 3-state multiplexing capability, propagation delays as low as 2 ns (data-to-output), ±24 mA output drive strength, and SOIC-16 packaging compatible with automated assembly.
Technical Context
The SN74ALS253DR implements two independent 4:1 multiplexer sections sharing select inputs A and B, each with dedicated output-enable (1OE, 2OE) controlling high-impedance state. Internal AND-OR gating with inverters and drivers enables full binary decoding of input data paths.
Each section drives a single 3-state output (1Y, 2Y) capable of sourcing −2.6 mA or sinking 24 mA at VCC = 4.5 V. Switching performance is characterized with CL = 50 pF and R1/R2 = 500 Ω, supporting sub-15 ns propagation delays for data-to-output transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS) TTL - ensures compatibility with legacy 74LS/74S systems while reducing power vs. standard TTL. |
| Supply Voltage Range | 4.5 V to 5.5 V - supports stable operation across industrial-grade 5 V rails with margin against ripple or droop. |
| Output Drive Capability | IOH = −2.6 mA / IOL = 24 mA - sufficient to directly drive multiple TTL inputs or terminate short PCB traces without buffering. |
| Propagation Delay (Data → Y) | 2 ns (min) to 10 ns (max) - enables reliable operation in systems with clock periods ≥ 20 ns (50 MHz effective data rate). |
| 3-State Enable/Disable Time | tPZH = 2 ns (min), tPLZ = 2 ns (min) - allows fast bus arbitration and dynamic output control in time-critical multiplexing. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments, not extended or military grade. |
| Package | SOIC-16 (D package), RoHS-compliant NiPdAu finish, MSL Level-1 - suitable for reflow soldering and high-volume SMT production. |
Pinout & Package
SN74ALS253DR is housed in a 16-pin small-outline integrated circuit (SOIC) package (package code D), 7.5 mm × 10.3 mm body, 1.27 mm pitch, with gull-wing leads. Pin 1 marked by notch or bevel; pin 1 quadrant Q1 per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE (Output Enable, Section 1) | Active-low control: drives 1Y to high-impedance when high; enables normal multiplexed output when low. |
| 2 | 1C0 (Data Input, Section 1) | Low-order data input for first 4:1 section; selected when A=0, B=0. |
| 3 | 1C1 (Data Input, Section 1) | Second data input for Section 1; selected when A=1, B=0. |
| 4 | 1C2 (Data Input, Section 1) | Third data input for Section 1; selected when A=0, B=1. |
| 5 | 1C3 (Data Input, Section 1) | High-order data input for Section 1; selected when A=1, B=1. |
| 6 | 1Y (Output, Section 1) | 3-state multiplexed output for Section 1; reflects selected Cx input when 1OE = L. |
| 7 | GND | Ground reference for all internal logic and output drivers. |
| 8 | 2C3 (Data Input, Section 2) | High-order data input for second 4:1 section; selected when A=1, B=1. |
| 9 | 2Y (Output, Section 2) | 3-state multiplexed output for Section 2; independent of 1Y and controlled by 2OE. |
| 10 | 2C0 (Data Input, Section 2) | Low-order data input for Section 2; selected when A=0, B=0. |
| 11 | 2C1 (Data Input, Section 2) | Second data input for Section 2; selected when A=1, B=0. |
| 12 | 2C2 (Data Input, Section 2) | Third data input for Section 2; selected when A=0, B=1. |
| 13 | 2OE (Output Enable, Section 2) | Active-low control for Section 2 output; fully independent of 1OE. |
| 14 | VCC | +5 V supply rail; decoupling capacitor required near pin for noise suppression. |
| 15 | B (Select Input) | Most-significant select bit shared by both sections; determines upper/lower pair of inputs. |
| 16 | A (Select Input) | Least-significant select bit shared by both sections; selects between two inputs within each pair. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Enables simultaneous routing of two separate 4-bit data streams using shared address lines - reduces address decode logic and board space. |
| Individual 3-state output enables | Allows one section to drive a shared bus while the other remains tri-stated - eliminates need for external bus buffers in multi-master configurations. |
| ALS logic family performance | Combines 74LS speed (sub-15 ns delays) with ~40% lower power than standard TTL - extends thermal margin in dense logic layouts. |
| Full binary decoding architecture | Internal inverters and AND-OR gates eliminate external decoding logic - simplifies design of address/data selectors in microprocessor peripherals. |
| SOIC-16 RoHS-compliant packaging | Supports automated pick-and-place and lead-free reflow (MSL-1, 260°C peak) - aligns with modern manufacturing requirements and lifecycle compliance. |
Applications
| Microprocessor Address/Data Bus Multiplexing | Programmable Logic Interface Selection |
|---|---|
|
Use Scenario: Selecting among four peripheral register addresses during I/O read/write cycles in an 8-bit microcontroller system. IC Role / Device Role / Timing Role: SN74ALS253DR acts as a dual address decoder-multiplexer, routing A0–A1 select lines to enable specific peripheral chips while isolating inactive ones via 3-state outputs. Use Value: Reduces glue logic count by eliminating discrete AND/OR gates; enables clean bus isolation with <2 ns enable/disable timing to prevent bus contention. |
Use Scenario: Configuring signal paths in a field-programmable gate array (FPGA) development board's I/O expansion header. IC Role / Device Role / Timing Role: SN74ALS253DR serves as a programmable I/O mux, allowing firmware to dynamically assign GPIO banks to UART, SPI, or parallel interface functions. Use Value: Provides hardware-level flexibility without FPGA reconfiguration; 24 mA sink capability drives LED indicators or level-shifted signals directly. |
| Digital Test Equipment Signal Routing | Legacy Industrial Control Backplane Interfacing |
|
Use Scenario: Routing calibration reference signals from four precision DACs to a single ADC input in automated test equipment. IC Role / Device Role / Timing Role: SN74ALS253DR functions as a precision analog-digital multiplexer controller - selecting source while maintaining TTL-compatible timing for synchronized sampling. Use Value: Delivers deterministic 10 ns max propagation delay and <0.5 V VOL, ensuring accurate timing alignment between channel selection and sample capture. |
Use Scenario: Adapting legacy 16-bit parallel control bus signals to newer PLC modules with varying pin assignments. IC Role / Device Role / Timing Role: SN74ALS253DR acts as a backplane signal translator, remapping fixed I/O lines to match module-specific address windows using hardwired A/B selects. Use Value: Enables drop-in replacement of obsolete multiplexers in installed base systems; ALS family ensures backward compatibility with existing 74LS-based timing budgets. |
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 |
|---|---|---|---|
| SN74ALS153N | Same ALS family, identical logic function and pinout, but in PDIP-16 package (not SOIC); no tape-and-reel option. | Preferred for through-hole prototyping or legacy board repairs where SOIC footprint is unavailable. | Select SN74ALS153N only when manual assembly or socket-based testing is required; SN74ALS253DR offers superior manufacturability for SMT production. |
| SN74AS253AD | Faster AS-family variant: 7.5 ns max tPHL (vs. 10 ns), higher drive (−15 mA/48 mA), but higher ICC (29 mA vs. 12 mA) and tighter VIH/VIL thresholds. | Suitable for high-speed bus arbitration or noise-immune designs where ALS timing margins are insufficient. | Choose SN74AS253AD only when sub-10 ns propagation is mandatory; SN74ALS253DR provides better power efficiency and noise margin for general-purpose use. |
Compared with SN74ALS153N and SN74AS253AD, the SN74ALS253DR delivers optimal balance of speed, power, package modernity, and production readiness - making it the preferred choice for new SMT designs requiring proven ALS reliability and RoHS compliance.
Availability
SN74ALS253DR is available at Aetrix Electronics and suitable for microprocessor bus interfacing, programmable logic configuration, digital test equipment signal routing, and legacy industrial control backplane adaptation requiring stable component supply and long-term manufacturability.
Supply support for SN74ALS253DR 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 with broad industrial, automotive, and communications reach.
The SN74ALS253DR belongs to TI's legacy 74ALS logic family - engineered for high-speed, low-power TTL-compatible digital interfacing in commercial and industrial control systems.
FAQ
What is the maximum clock/data rate supported by the SN74ALS253DR?
The SN74ALS253DR supports reliable operation with data setup/hold times compatible with 50 MHz system clocks. Its worst-case propagation delay from data input to output is 10 ns, and from select inputs (A/B) to output is 21 ns - enabling use in synchronous systems with ≥20 ns minimum cycle time. The device does not contain internal clocks; timing depends entirely on external signal edges and load conditions.
Does the SN74ALS253DR require external pull-up resistors on its 3-state outputs?
No, the SN74ALS253DR does not require external pull-up resistors on its 1Y or 2Y outputs. Its totem-pole 3-state outputs actively drive high (VOH ≥ 2.4 V at −2.6 mA) or low (VOL ≤ 0.4 V at 24 mA) when enabled, and present high impedance (>10 kΩ) when disabled. Pull-ups are only needed if interfacing with open-collector systems - which is not the intended use case for this device.
Can the SN74ALS253DR operate with a 3.3 V supply?
No, the SN74ALS253DR is not rated for 3.3 V operation. Its absolute maximum supply voltage is 7 V, but recommended operating range is strictly 4.5 V to 5.5 V. At 3.3 V, the internal ALS circuitry fails to meet VIH/VIL thresholds, output drive collapses, and DC parameters fall outside specification. For 3.3 V systems, consider TI's 74LVC series or level-shifting solutions.
How does the SN74ALS253DR differ from the SN74LS253 in practical design?
The SN74ALS253DR offers approximately 30% faster propagation delays (10 ns vs. 15 ns typical), 40% lower quiescent current (12 mA vs. 20 mA), and improved noise immunity due to tighter VIH/VIL specs (2.0 V/0.8 V vs. 2.0 V/0.8 V but with lower IIL). These differences allow denser board layouts, reduced thermal load, and more robust operation in electrically noisy industrial environments compared to the older LS version.
Is the SN74ALS253DR pin-compatible with the SN74AS253AD?
Yes, the SN74ALS253DR and SN74AS253AD share identical SOIC-16 pinouts, pin functions, and pin numbering per TI's datasheet diagrams. However, they are not functionally interchangeable without design review: the AS variant draws significantly more supply current, has stricter input voltage thresholds, and delivers higher output drive - potentially affecting power distribution, noise margins, and timing closure in existing ALS-designed circuits.
SN74ALS253DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74ALS253DR FAQ
1.How can I place an order for SN74ALS253DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS253DR 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 SN74ALS253DR reliable?
The price and inventory of SN74ALS253DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS253DR is usually 5 days.
3.What payment methods are accepted for SN74ALS253DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS253DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS253DR?
SN74ALS253DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS253DR 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 SN74ALS253DR?
For technical support, including SN74ALS253DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS253DR requirements.
6.How does Aetrix verify that SN74ALS253DR is sourced from the original manufacturer or authorized distributors?
All SN74ALS253DR 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 SN74ALS253DR meets industry standards.
7.What is the process for return or replacement of SN74ALS253DR?
All SN74ALS253DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS253DR, 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 SN74ALS253DR part is unused and in its original packaging.
Return procedure for SN74ALS253DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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