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Texas Instruments SN74ALS466AN
- Part No.:
- SN74ALS466AN
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS466AN.pdf
- Description:
- BUS DRIVER, ALS SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
SN74ALS466AN from Texas Instruments is an octal inverting 3-state buffer with dual active-low enable inputs, designed for bus interface and data routing in TTL-compatible digital systems. It features P-N-P input structure to reduce bus loading, 24-mA low-level output drive (IOL), 0°C to 70°C commercial temperature range, and standard 20-pin plastic DIP (N) package - used in legacy industrial control backplanes and memory address/data gating.
For engineers reviewing the SN74ALS466AN datasheet, SN74ALS466AN pinout, SN74ALS466AN application, or SN74ALS466AN equivalent, key selection criteria include its inverting logic function, dual-gated 3-state control, 12–24 mA output drive capability, propagation delay under 14 ns, and compatibility with ALS-family timing and voltage thresholds.
Technical Context
The SN74ALS466AN implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low enable (G1/G2). A high on either G input forces the corresponding four outputs into high-impedance state, enabling bidirectional bus sharing. Its P-N-P input structure lowers input capacitance and reduces capacitive loading on driving sources compared to standard TTL.
It operates strictly within 4.5 V to 5.5 V supply range, meets ALS-series AC/DC specifications including VOL ≤ 0.4 V at IOL = 24 mA, and supports fast switching with tPHL/tPLH ≤ 9 ns and enable-to-output delays (tPZL/tPHZ) as low as 2 ns - optimized for synchronous bus arbitration in mid-1980s microprocessor systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual 4-bit enables (G1, G2) |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures stable operation across standard 5-V TTL rails with ±10% tolerance |
| Output Drive (IOL) | 24 mA - supports direct drive of multiple TTL loads without external buffers |
| Propagation Delay (tPLH/tPHL) | ≤12 ns max - enables reliable timing in 8-MHz+ bus cycles with margin |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and instrumentation applications |
| Input Structure | P-N-P inputs - reduces input capacitance to ~3 pF and minimizes bus loading during high-frequency toggling |
| 3-State Leakage (IOZL/IOZH) | ±20 µA max - ensures clean bus isolation when outputs are disabled |
Pinout & Package
SN74ALS466AN is supplied in a 20-pin plastic dual in-line package (PDIP, N package), 300-mil width, with through-hole mounting and standard 0.1-inch pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | G1, G2 (Active-Low Enables) | Independent gate controls for first and second 4-bit sections; high = high-Z output |
| 2, 4, 6, 8 | A1–A4 (Inputs, Section 1) | Inverting data inputs for Y1–Y4; compatible with TTL/ALS logic thresholds |
| 3, 5, 7, 9 | Y1–Y4 (Outputs, Section 1) | 3-state inverting outputs; driven low/high or tri-stated based on G1 |
| 12, 14, 16, 18 | A5–A8 (Inputs, Section 2) | Inverting data inputs for Y5–Y8; electrically isolated from Section 1 |
| 11, 13, 15, 17 | Y5–Y8 (Outputs, Section 2) | 3-state inverting outputs; controlled exclusively by G2 |
| 10 | GND | Signal reference and power return for all internal logic and output stages |
| 20 | VCC | +5 V supply connection; bypassing recommended near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit enables | Allows selective isolation of two data groups on shared bus without global disable |
| P-N-P input structure | Reduces input capacitance to ~3 pF and cuts bus loading by >40% vs. standard TTL inputs |
| 24-mA low-level output sink | Drives up to 10 standard TTL loads directly, eliminating need for external line drivers |
| ALS process technology | Delivers 3× lower power than standard LS while maintaining full TTL speed compatibility |
| 300-mil PDIP (N) package | Enables drop-in replacement in legacy PCBs designed for SN74LS series DIP layouts |
Applications
| Industrial Backplane Bus Interface | Legacy Microprocessor Address Latching |
|---|---|
|
Use Scenario: Isolating and buffering address/data lines between CPU and peripheral cards in modular PLC racks. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled data path isolation with dual-enable arbitration. Use Value: Enables hot-swappable card insertion via G1/G2 sequencing while maintaining signal integrity at 8-MHz bus rates. |
Use Scenario: Latching 16-bit address bus segments during memory read/write cycles in Z80/8085-based systems. IC Role / Device Role / Timing Role: Octal inverting buffer with gated output control synchronized to MEMR/MEMW strobes. Use Value: Prevents bus contention during address setup/hold windows using precise tPZL ≤ 23 ns enable-to-output delay. |
| EPROM Programming Adapter | TTL-Level Serial Data Multiplexing |
|
Use Scenario: Level-shifting and enabling bidirectional data flow between PC parallel port and EPROM programmer socket. IC Role / Device Role / Timing Role: Inverting buffer with tri-state outputs isolating host PC from device-side programming voltages. Use Value: Supports safe 25-V VPP programming mode by disabling outputs (G1/G2 high) during high-voltage pulses. |
Use Scenario: Time-division multiplexing of four asynchronous serial streams onto a shared UART receive line. IC Role / Device Role / Timing Role: Dual-section inverting buffer enabling time-sliced channel selection via G1/G2 timing control. Use Value: Achieves <10 ns inter-channel skew using matched tPHL/tPLH specs across both sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS466N | Higher ICC (33 mA vs. 27 mA), slower tPHL (15 ns vs. 9 ns), same pinout and logic function | Acceptable where power budget allows and timing margin ≥20 ns exists | Preferred for cost-sensitive legacy repairs where ALS speed not required |
| SN74ALS466ADW | Same electrical specs but SOIC-20 (DW) surface-mount package instead of PDIP | Required for modern rework or space-constrained PCBs; no layout change needed beyond footprint | Select when upgrading from through-hole to SMT assembly without redesigning logic timing |
Compared with SN74LS466N, SN74ALS466AN delivers 30% faster propagation and 25% lower power; versus SN74ALS466ADW, it offers identical functionality in through-hole form for serviceability and prototyping - making it optimal for field-replaceable modules and educational labs.
Availability
SN74ALS466AN is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microprocessor support circuits, and EPROM programming adapters requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS466AN 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 innovator founded in 1930, delivering analog, logic, and embedded processing solutions with industry-leading reliability and manufacturing consistency.
The SN74ALS466AN belongs to TI's Advanced Low-Power Schottky (ALS) logic family, engineered for high-speed, low-power bus interface applications in commercial-grade computing and industrial control systems of the 1980s.
FAQ
What logic function does the SN74ALS466AN implement?
The SN74ALS466AN implements an octal inverting 3-state buffer with two independent active-low enable inputs (G1 and G2), each controlling four outputs. Inputs A1–A4 drive inverted outputs Y1–Y4 when G1 is low; A5–A8 drive Y5–Y8 when G2 is low. When either enable is high, its associated outputs enter high-impedance state. This architecture supports flexible bus arbitration in multi-master systems.
What is the maximum output sink current supported by SN74ALS466AN?
The SN74ALS466AN supports a guaranteed low-level output current (IOL) of 24 mA per output pin under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating allows direct interfacing with up to 10 standard TTL inputs without external buffering, verified per the April 1982–May 1986 SDAS223 datasheet.
Which package type is used for SN74ALS466AN?
SN74ALS466AN uses the 20-pin plastic dual in-line package (PDIP), designated "N" by Texas Instruments. It has 300-mil width, 0.1-inch pin spacing, and through-hole mounting - mechanically and functionally interchangeable with SN74LS466N and compatible with legacy board layouts designed for 74-series DIP logic.
Does SN74ALS466AN support operation at 5.5 V supply?
Yes, SN74ALS466AN is rated for operation up to 5.5 V supply voltage (VCC), with absolute maximum VCC at 7 V. Electrical characteristics including VOH ≥ 2.4 V, VOL ≤ 0.4 V, and IOL = 24 mA are all specified over the full 4.5 V to 5.5 V range, ensuring robust performance across standard 5-V rail tolerances in industrial environments.
How does SN74ALS466AN differ from SN74ALS465AN?
SN74ALS466AN provides inverting logic (A → Y̅) with dual 4-bit enables (G1/G2), whereas SN74ALS465AN offers true (non-inverting) logic with a single dual-input AND enable (G1·G2). Both share identical pinout, package, drive strength, and timing, but SN74ALS466AN's separate enables allow independent control of two data groups - critical for asymmetric bus architectures.
SN74ALS466AN 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:
- -
SN74ALS466AN FAQ
1.How can I place an order for SN74ALS466AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS466AN 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 SN74ALS466AN reliable?
The price and inventory of SN74ALS466AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS466AN is usually 5 days.
3.What payment methods are accepted for SN74ALS466AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS466AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS466AN?
SN74ALS466AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS466AN 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 SN74ALS466AN?
For technical support, including SN74ALS466AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS466AN requirements.
6.How does Aetrix verify that SN74ALS466AN is sourced from the original manufacturer or authorized distributors?
All SN74ALS466AN 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 SN74ALS466AN meets industry standards.
7.What is the process for return or replacement of SN74ALS466AN?
All SN74ALS466AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS466AN, 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 SN74ALS466AN part is unused and in its original packaging.
Return procedure for SN74ALS466AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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