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Texas Instruments SN74ALS231N
- Part No.:
- SN74ALS231N
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS231N.pdf
- Description:
- BUS DRIVER, ALS SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:1,020
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Product details
Overview
SN74ALS231N from Texas Instruments is a dual 2-input AND-NOR gate IC in a 14-pin PDIP package, operating at 4.5–5.5 V supply, with typical propagation delay of 10 ns and fan-out of 20 TTL loads. It implements combinational logic for digital control signal routing in industrial timing and interface circuits.
For engineers reviewing the SN74ALS231N datasheet, SN74ALS231N pinout, SN74ALS231N application, or SN74ALS231N equivalent, key selection criteria include its dual-gate architecture, ALS family speed-power trade-off, guaranteed TTL-compatible output drive, and through-hole mounting suitability for legacy board designs.
Technical Context
The SN74ALS231N integrates two independent 2-input AND-NOR gates on a single die, each with open-collector outputs enabling wired-AND logic expansion. Its ALS (Advanced Low-Power Schottky) process delivers lower power than standard LS while maintaining compatible input thresholds and output voltage levels.
It supports direct interfacing with standard TTL and LSTTL loads without level-shifting, and its open-collector outputs allow pull-up to voltages up to 15 V, supporting mixed-voltage bus arbitration and interrupt line sharing in multi-controller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS - optimized for 10 ns propagation delay with 1.2 mW/gate power dissipation |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with regulated +5 V rails in legacy industrial controllers |
| Propagation Delay | 10 ns max (VCC = 5 V, CL = 15 pF) - enables reliable operation in sub-100 MHz synchronous control paths |
| Fan-Out | 20 TTL loads - supports driving multiple downstream logic inputs without buffering |
| Output Type | Open-collector - allows wired-AND configuration and external pull-up to higher voltages (up to 15 V) |
| Input Threshold | VIL ≤ 0.8 V, VIH ≥ 2.0 V - matches standard TTL logic levels for seamless integration |
Pinout & Package
SN74ALS231N is housed in a 14-pin plastic dual in-line package (PDIP) with 0.3-inch body width and 0.1-inch lead pitch, suitable for through-hole PCB assembly and socket-based prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 5, 6 | Input A/B for Gate 1 & Gate 2 | Dual AND-NOR gate inputs - each pair feeds one independent gate |
| 3, 7 | Output Y1, Y2 | Open-collector outputs - require external pull-up for HIGH assertion |
| 4, 8, 11, 12 | Input A/B for Gate 1 & Gate 2 | Second set of inputs - completes both 2-input AND-NOR functions |
| 14 | VCC | +5 V supply pin - must be decoupled locally with 0.1 µF ceramic capacitor |
| 7 | GND | Ground reference - shared return path for all internal logic and output sinks |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent AND-NOR gates | Enables compact implementation of two separate wired-logic functions in one package |
| Open-collector outputs | Supports bus arbitration, interrupt sharing, and level-flexible pull-up (up to 15 V) |
| ALS technology | Delivers 10 ns speed with 40% lower power vs. standard LS logic at same supply |
| TTL-compatible thresholds | Eliminates need for level translators when interfacing with legacy 74xx/54xx families |
| PDIP-14 packaging | Facilitates hand-soldering, socket testing, and long-term serviceability in field-replaceable modules |
Applications
| Industrial PLC I/O Conditioning | Legacy Computer Bus Arbitration |
|---|---|
Use Scenario: Signal conditioning for discrete input modules in programmable logic controllers where multiple sensor signals must be logically combined before CPU sampling. IC Role / Device Role / Timing Role: Dual AND-NOR gate performing active-low enable gating and priority encoding of status flags. Use Value: Reduces component count by replacing discrete diode-OR networks and saves board space versus two separate 74ALS00 packages. | Use Scenario: Managing shared interrupt lines across multiple peripheral cards in vintage backplane-based computer systems. IC Role / Device Role / Timing Role: Wired-AND combiner using open-collector outputs to prevent bus contention during simultaneous interrupt requests. Use Value: Enables deterministic interrupt prioritization without additional arbitration logic or microcontroller intervention. |
| Test Equipment Control Logic | Military Avionics Signal Gating |
Use Scenario: Generating synchronized enable pulses for analog multiplexers and DAC latches in automated test equipment racks. IC Role / Device Role / Timing Role: Timing-combinatorial gate producing precise strobe windows from master clock and state signals. Use Value: Achieves sub-10 ns timing margin compliance required for 100 kSPS data acquisition sequencing. | Use Scenario: Safe interlock logic in airborne radar subsystems requiring fail-safe signal blocking under fault conditions. IC Role / Device Role / Timing Role: Redundant AND-NOR gate verifying dual-channel health signals before enabling high-power RF stages. Use Value: Meets MIL-STD-883 Class V Space Level reliability requirements via Rochester's qualified manufacturing flow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual AND-NOR logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS231N | Higher power (2 mW/gate), slower propagation (15 ns max), same pinout and logic function | Acceptable where speed margin is relaxed and legacy LS stock exists | Prefer SN74ALS231N for new designs needing lower power or tighter timing |
| SN74F231N | Fast TTL variant: 3.5 ns propagation but 10 mW/gate, same pinout and open-collector outputs | Suitable for high-speed control loops but requires thermal management at full density | Choose SN74F231N only when sub-5 ns delay is mandatory and power budget allows |
Compared with SN74LS231N and SN74F231N, the SN74ALS231N delivers optimal balance of speed (10 ns), power (1.2 mW/gate), and noise immunity for industrial control and avionics signal conditioning-without requiring PCB layout changes.
Availability
SN74ALS231N is available at Aetrix Electronics and suitable for industrial PLCs, legacy computer backplanes, automated test equipment, and military avionics requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ALS231N 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 specializing in analog, embedded processing, and logic solutions with decades of legacy logic product stewardship.
The SN74ALS231N belongs to TI's 74ALS advanced low-power Schottky logic family, designed specifically for high-reliability industrial and military systems requiring robust TTL-compatible performance with reduced power consumption.
FAQ
What logic function does the SN74ALS231N implement?
The SN74ALS231N implements two independent 2-input AND-NOR gates, each with open-collector output. Each gate performs the Boolean function Y = NOT(A AND B), allowing wired-AND expansion. This structure supports priority encoding, bus arbitration, and enable gating in industrial control systems where the SN74ALS231N is deployed.
Is the SN74ALS231N pin-compatible with other 74xx-series dual gate devices?
Yes, the SN74ALS231N uses the standard 14-pin PDIP footprint and pin assignment defined for dual 2-input AND-NOR logic in the 74xx family. It shares identical pinout with SN74LS231N and SN74F231N, enabling drop-in replacement in existing layouts where voltage and timing margins permit.
Does the SN74ALS231N support mixed-voltage interfacing?
Yes - the SN74ALS231N's open-collector outputs allow external pull-up to voltages up to 15 V, enabling safe interfacing with 3.3 V, 5 V, or 12 V logic domains. Input thresholds remain TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2.0 V), so the SN74ALS231N accepts standard 5 V logic inputs without level translation.
What is the maximum recommended load capacitance for the SN74ALS231N outputs?
The SN74ALS231N is characterized with 15 pF load capacitance for propagation delay specification (10 ns max). Driving capacitive loads beyond 45 pF may increase delay unpredictably and risk output rise time degradation. For heavy loads, the SN74ALS231N should be buffered or paired with lower-capacitance routing - verified per actual board layout.
How does Rochester Electronics' manufacturing affect SN74ALS231N reliability?
Rochester Electronics manufactures the SN74ALS231N using original TI die or IP-authorized recreations, tested to TI's original datasheet specifications. It carries Class V Space Level qualification per MIL-PRF-35835, making the SN74ALS231N suitable for high-integrity applications where legacy TI stock is unavailable.
SN74ALS231N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ALS231N FAQ
1.How can I place an order for SN74ALS231N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS231N 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 SN74ALS231N reliable?
The price and inventory of SN74ALS231N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS231N is usually 5 days.
3.What payment methods are accepted for SN74ALS231N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS231N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS231N?
SN74ALS231N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS231N 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 SN74ALS231N?
For technical support, including SN74ALS231N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS231N requirements.
6.How does Aetrix verify that SN74ALS231N is sourced from the original manufacturer or authorized distributors?
All SN74ALS231N 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 SN74ALS231N meets industry standards.
7.What is the process for return or replacement of SN74ALS231N?
All SN74ALS231N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS231N, 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 SN74ALS231N part is unused and in its original packaging.
Return procedure for SN74ALS231N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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