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Texas Instruments SN74AS253ANSR
- Part No.:
- SN74AS253ANSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74AS253ANSR.pdf
- Description:
- MULTIPLEXER BIPOLAR 3-ST 8-IN 16
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Product details
Overview
SN74AS253ANSR 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, supporting 48 mA sink and −15 mA source output drive, and characterized for 0°C to 70°C operation in a 16-pin plastic DIP (N) package. It enables parallel-to-serial conversion and bus multiplexing in TTL-compatible digital systems.
For engineers reviewing the SN74AS253ANSR datasheet, SN74AS253ANSR pinout, SN74AS253ANSR application, or SN74AS253ANSR equivalent, key selection criteria include its dual-section architecture with separate OE controls, high-speed propagation (as low as 2.5 ns tPLH on data inputs), robust 3-state bus-driving capability, and compatibility with legacy AS-series logic families.
Technical Context
The SN74AS253ANSR implements two independent 4:1 multiplexer sections sharing common select lines A and B, each with dedicated output-enable (1OE, 2OE) inputs controlling high-impedance states. Its internal structure includes binary-decoded AND-OR gates with inverters and drivers for full decoding.
Each section selects one of four data inputs (C0–C3) based on A/B address bits and drives a dedicated output (1Y or 2Y) with active-low 3-state control. The device uses bipolar Schottky (AS) technology, delivering faster switching than ALS variants-e.g., tPHL(A→Y) ≤ 11.5 ns vs. 21 ns for SN74ALS253-with higher output current drive and tighter VOL/VOL specs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard TTL power rails with margin for ripple. |
| Output Drive (IOL/IOH) | 48 mA sink / −15 mA source - Directly drives heavy capacitive loads or multiple TTL inputs without buffers. |
| Propagation Delay (tPLH, Data→Y) | 2.5 ns (min) to 7.5 ns (max) - Enables high-speed data routing in sub-10 ns critical paths. |
| 3-State Enable/Disable Time | tPHZ ≤ 6 ns, tPLZ ≤ 7 ns - Minimizes bus contention windows during output state transitions. |
| Input Voltage Thresholds | VIH = 2 V, VIL = 0.8 V - Fully compatible with standard TTL logic levels and noise margins. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade industrial and computing applications. |
| Package | 16-pin PDIP (N) - Through-hole mounting for prototyping, legacy systems, and high-reliability board assembly. |
Pinout & Package
SN74AS253ANSR is housed 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 marked by a notch or dot; pin numbering follows standard DIP convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1C0) | Data input, Section 1 | Low-order data input for first 4:1 mux; tied to internal AND gate for C0 selection when A=0,B=0. |
| 2 (1C1) | Data input, Section 1 | Second data input for Section 1; selected when A=1,B=0 per function table. |
| 3 (1C2) | Data input, Section 1 | Third data input for Section 1; selected when A=0,B=1. |
| 4 (1C3) | Data input, Section 1 | High-order data input for Section 1; selected when A=1,B=1. |
| 5 (1Y) | Output, Section 1 | Active-drive or high-Z output of Section 1; driven only when 1OE = L. |
| 6 (1OE) | Output enable, Section 1 | Active-low control: asserts 1Y when low; places 1Y in high-Z when high. |
| 7 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-impedance. |
| 8 (2C0) | Data input, Section 2 | Low-order data input for second 4:1 mux; shares select lines A/B with Section 1. |
| 9 (2C1) | Data input, Section 2 | Second data input for Section 2; selected under same A/B codes as 1C1. |
| 10 (2C2) | Data input, Section 2 | Third data input for Section 2; selected under same A/B codes as 1C2. |
| 11 (2C3) | Data input, Section 2 | High-order data input for Section 2; selected under same A/B codes as 1C3. |
| 12 (2Y) | Output, Section 2 | Independent active-drive or high-Z output; controlled solely by 2OE. |
| 13 (2OE) | Output enable, Section 2 | Active-low control for Section 2 output; decouples 2Y from bus without affecting 1Y. |
| 14 (VCC) | Power supply | +5 V nominal supply; requires local 0.1 µF ceramic bypass capacitor near pin. |
| 15 (B) | Select input (shared) | MSB of 2-bit address; determines C2/C3 vs. C0/C1 group selection for both sections. |
| 16 (A) | Select input (shared) | LSB of 2-bit address; combines with B to fully decode four input channels per section. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Two fully isolated data paths sharing only A/B select lines-enables simultaneous routing of two data streams without crosstalk. |
| Individual 3-state output enables | Separate 1OE and 2OE pins allow selective bus arbitration: one section can drive while the other remains high-Z, eliminating external gating logic. |
| AS-family speed and drive | Sub-10 ns propagation and 48 mA sink capability support direct interfacing with legacy TTL buses and fast control-plane logic. |
| TTL-compatible input thresholds | VIH = 2 V / VIL = 0.8 V ensures reliable recognition of standard TTL outputs without level-shifting. |
| Robust 3-state isolation | IOZL ≤ −50 µA and IOZH ≤ 50 µA guarantee minimal leakage in disabled state-critical for multi-drop bus integrity. |
Applications
| Industrial Control Backplane | Legacy Computer I/O Expansion |
|---|---|
|
Use Scenario: Routing sensor data from eight analog input modules onto a shared 8-bit data bus in a programmable logic controller (PLC) rack. IC Role / Device Role: Dual-section multiplexer consolidates two 4-channel input groups into time-multiplexed bus traffic, synchronized by CPU address lines. Use Value: Eliminates need for discrete gating logic or additional bus transceivers-reduces component count and PCB area while maintaining deterministic timing via AS-speed propagation. |
Use Scenario: Selecting between four peripheral registers (UART, timer, GPIO, interrupt controller) in an ISA-bus-compatible embedded system. IC Role / Device Role: Acts as address-decoded data path selector, using ISA address bits A1–A0 to choose register data for CPU read/write cycles. Use Value: Provides pin-level compatibility with original design schematics using SN74ALS253, while improving bus settling time and noise immunity via tighter VOL spec (0.35 V max). |
| Test Equipment Signal Routing | Digital Audio Multiplexer Interface |
|
Use Scenario: Switching between four calibration reference signals into a single ADC channel in automated test equipment (ATE). IC Role / Device Role: Precision signal selector with low crosstalk and fast enable/disable-ensures clean signal acquisition without ghosting between channels. Use Value: Sub-7 ns tPZL/tPHZ minimizes dead time between channel changes; 3-state outputs prevent loading of unused references during selection. |
Use Scenario: Combining four stereo audio data streams (I²S format) into a single serial output for FPGA-based audio processing. IC Role / Device Role: Parallel-to-serial converter synchronizing sample data from multiple codecs using common bit-clock and frame-sync signals. Use Value: AS-family propagation consistency (<±1 ns skew between sections) preserves inter-channel timing alignment critical for multi-track audio sampling. |
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 | Slower propagation (tPHL up to 21 ns), lower drive (24 mA IOL), wider VOL range (0.4 V max). | Suitable for cost-sensitive, non-critical timing applications where AS-speed is unnecessary. | Select when legacy board compatibility and lower power (ICC = 12 mA vs. 29 mA) outweigh speed requirements. |
| SN74HC153N | CMOS technology, rail-to-rail VIH/VIL, 100 µA ICC, but slower (tPLH up to 29 ns) and lower drive (±5.2 mA). | Better for low-power, mixed-voltage systems interfacing with 3.3 V logic; not TTL-compatible. | Choose for battery-powered or voltage-flexible designs where fanout and speed are secondary to quiescent current. |
Compared with SN74ALS253N and SN74HC153N, SN74AS253ANSR delivers the highest speed and drive strength among pin-compatible dual 4:1 muxes in PDIP, making it optimal for legacy TTL bus systems requiring deterministic sub-10 ns routing and robust noise margins.
Availability
SN74AS253ANSR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy computer I/O expansion, automated test equipment signal routing, and digital audio multiplexer interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS253ANSR 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.
SN74AS253ANSR belongs to TI's legacy Advanced Schottky (AS) logic family, engineered for high-speed, high-drive TTL-compatible digital systems where performance and reliability in commercial temperature ranges are essential.
FAQ
What is the maximum clock/data rate supported by SN74AS253ANSR?
SN74AS253ANSR does not operate on a clock; it is asynchronous. Its maximum usable data rate depends on propagation delay and system setup/hold timing. With tPLH/tPHL ≤ 7.5 ns and tPZL/tPHZ ≤ 7 ns, it supports reliable multiplexing of signals with edge rates up to ~100 MHz in well-designed layouts-assuming proper load capacitance (≤50 pF) and termination.
Can SN74AS253ANSR interface directly with 3.3 V logic devices?
No-SN74AS253ANSR is a 5 V-only TTL-compatible device. Its VIH minimum is 2.0 V, which may accept 3.3 V logic HIGH, but its outputs swing from 0.35 V (VOL) to ≥2.4 V (VOH) at 5 V VCC and cannot safely drive 3.3 V inputs without risk of overvoltage or excessive current. Level-shifting circuitry is required for reliable 3.3 V interface.
Does SN74AS253ANSR have power-on reset or built-in ESD protection?
SN74AS253ANSR has no internal power-on reset circuitry-it powers up in an undefined output state until valid inputs are applied. Per datasheet, it includes standard bipolar ESD protection (±2 kV HBM), but external transient suppression is recommended in noisy industrial environments per TI application guidelines.
How does the dual-output architecture of SN74AS253ANSR reduce system complexity?
SN74AS253ANSR integrates two independent 4:1 multiplexers with separate OE controls in one 16-pin package. This eliminates the need for two discrete '153 devices and associated glue logic, reducing PCB footprint, interconnect inductance, and BOM line items-especially valuable in space-constrained backplane and instrumentation designs.
Is SN74AS253ANSR RoHS compliant and lead-free?
Yes-SN74AS253ANSR (orderable as SN74AS253ANE4) is RoHS-compliant and lead-free, with CU NIPDAU lead finish. TI's packaging documentation confirms Pb-Free (RoHS) status for this PDIP variant, meeting EU Directive 2011/65/EU requirements for hazardous substances.
SN74AS253ANSR 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:
- -
SN74AS253ANSR FAQ
1.How can I place an order for SN74AS253ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS253ANSR 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 SN74AS253ANSR reliable?
The price and inventory of SN74AS253ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS253ANSR is usually 5 days.
3.What payment methods are accepted for SN74AS253ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS253ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS253ANSR?
SN74AS253ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS253ANSR 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 SN74AS253ANSR?
For technical support, including SN74AS253ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS253ANSR requirements.
6.How does Aetrix verify that SN74AS253ANSR is sourced from the original manufacturer or authorized distributors?
All SN74AS253ANSR 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 SN74AS253ANSR meets industry standards.
7.What is the process for return or replacement of SN74AS253ANSR?
All SN74AS253ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS253ANSR, 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 SN74AS253ANSR part is unused and in its original packaging.
Return procedure for SN74AS253ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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