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Texas Instruments SN74ALS29864NT
- Part No.:
- SN74ALS29864NT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS29864NT.pdf
- Description:
- BUS TRANSCEIVER, ALS SERIES
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Inventory:5,245
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Product details
Overview
SN74ALS29864NT from Rochester Electronics is a 16-bit bus transceiver with 3-state outputs, designed for bidirectional data flow control in TTL-compatible systems, featuring 2.0V minimum input high voltage, 0.8V maximum input low voltage, and ±24mA output drive capability. It operates across 4.5V to 5.5V supply range and supports industrial temperature range (–40°C to +85°C).
For engineers reviewing the SN74ALS29864NT datasheet, SN74ALS29864NT pinout, SN74ALS29864NT application, or SN74ALS29864NT equivalent, key selection factors include its 16-bit bidirectional bus interface role, TTL-compatible logic thresholds, 3-state enable timing, and industrial-grade thermal performance.
Technical Context
This device implements dual 8-bit bidirectional bus transceivers with independent transmit/receive direction control via two active-low OE inputs and one active-high DIR input per octet. Each transceiver section includes separate output-enable logic to support isolated bus arbitration and hot-swap readiness.
It uses standard ALS (Advanced Low-power Schottky) bipolar technology, delivering propagation delays of 12ns (max) at VCC = 5V and CL = 50pF, with guaranteed noise immunity of 0.4V under worst-case conditions and DC output leakage current ≤ ±10μA at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-power Schottky) – enables TTL-compatible interfacing with reduced power vs. standard LS. |
| Bus Width | 16-bit (dual 8-bit sections) – supports parallel data transfer between two 16-bit subsystems or memory/data buses. |
| Supply Voltage | 4.5V to 5.5V – ensures compatibility with legacy 5V TTL systems and tolerance to rail variation. |
| Propagation Delay | 12ns max (tPLH/tPHL at VCC=5V, CL=50pF) – defines maximum clock-to-output timing for synchronous bus designs. |
| Output Drive | ±24mA (IOH/IOL) – sufficient to drive 10 standard TTL loads or terminate stubs in medium-length backplanes. |
| Operating Temperature | –40°C to +85°C – validated for industrial environments without derating or external thermal management. |
Pinout & Package
SN74ALS29864NT is supplied in a 48-pin plastic leaded chip carrier (PLCC-48) package with J-leads, measuring 18.92mm × 18.92mm × 3.56mm, compliant with JEDEC MO-047AB. Pin assignment follows industry-standard 16-bit transceiver layout with mirrored I/O banks and dedicated control pins per octet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8, B1–B8 | Data I/O Port A / Port B | Two independent 8-bit bidirectional data ports; direction controlled per octet by DIR and OE signals. |
| DIR1, DIR2 | Direction Control Input (active-high) | Selects data flow direction (A→B or B→A) for each 8-bit section independently. |
| OE1, OE2 | Output Enable Input (active-low) | Disables outputs to high-impedance state; allows bus sharing without contention. |
| VCC, GND | Power Supply Pins | Dual VCC (pins 24, 48) and multiple GND (pins 1, 12, 25, 36, 48) reduce switching noise and improve signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 16-bit data path | Enables full-duplex communication between microprocessor buses and peripheral modules without external direction logic. |
| Independent octet control | Allows simultaneous operation of two 8-bit subsystems (e.g., address/data separation or dual memory banks) with no interdependence. |
| TTL-compatible input thresholds | VIH(min) = 2.0V and VIL(max) = 0.8V ensure reliable interfacing with legacy 5V TTL, LSTTL, and ALS devices. |
| High-output drive strength | ±24mA sink/source capability supports direct connection to unterminated PCB traces up to 15cm in length at 10MHz. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing a modern controller module to an aging 16-bit VMEbus chassis using discrete logic. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between CPU and I/O cards while isolating voltage domains. Use Value: Eliminates need for level-shifting buffers and reduces board space by consolidating two 8-bit transceivers into one PLCC-48 package. | Use Scenario: Extending a 16-bit ISA bus in a test equipment rack to add new instrumentation modules. IC Role / Device Role / Timing Role: Direction-controlled data repeater enabling hot-plug insertion of peripheral cards without bus contention. Use Value: ±24mA drive and 12ns delay ensure signal integrity across 30cm backplane traces at 8MHz operation. |
| Microcontroller Memory Expansion | Embedded Data Acquisition Hub |
Use Scenario: Adding external SRAM/ROM to an 80C188-based embedded controller with limited address/data multiplexing. IC Role / Device Role / Timing Role: Address/data bus separator providing non-multiplexed 16-bit parallel access to external memory. Use Value: Independent DIR/OE per octet allows simultaneous address latching and data read/write cycles without added glue logic. | Use Scenario: Aggregating analog sensor data from eight channels into a central DSP unit via shared 16-bit parallel bus. IC Role / Device Role / Timing Role: Synchronized data concentrator buffering sensor outputs before burst transmission to host processor. Use Value: Industrial temperature rating (–40°C to +85°C) and robust noise margin (0.4V) ensure reliability in electrically noisy factory-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS29864N | Faster propagation delay (8ns max), higher power consumption (35mA ICC), AS-family logic thresholds (VIH=2.0V, VIL=0.8V same). | Better suited for high-speed backplanes (>12MHz) but requires tighter thermal management. | Choose SN74AS29864N only if system timing budget demands sub-10ns delay and power dissipation is not constrained. |
| SN74LS29864N | Slower propagation delay (18ns max), lower drive (±15mA), identical pinout and logic thresholds. | Acceptable for low-frequency (<5MHz) legacy upgrades where power and heat are primary concerns. | Prefer SN74LS29864N when replacing failed units in cost-sensitive, low-speed industrial controllers with existing thermal design. |
Compared with SN74AS29864N and SN74LS29864N, the SN74ALS29864NT delivers optimal balance of speed (12ns), drive strength (±24mA), and power efficiency for mid-speed industrial bus interfaces operating at 5–10MHz with ambient temperatures up to +85°C.
Availability
SN74ALS29864NT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and microcontroller memory expansion requiring stable component supply across extended product lifecycles.
Supply support for SN74ALS29864NT 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
Rochester Electronics is a certified semiconductor lifecycle solutions provider authorized to manufacture and test legacy ICs using original IP or sourced die, with ISO-9001, AS9120, and QML certifications.
The SN74ALS29864NT belongs to Rochester's manufactured legacy logic portfolio, designed specifically to replace obsolete Texas Instruments ALS-family bus transceivers in long-lifecycle industrial and defense systems.
FAQ
What is the maximum clock frequency supported by SN74ALS29864NT in a 16-bit bus application?
The SN74ALS29864NT does not include an internal clock; it is a combinatorial bus transceiver. Its usable data rate depends on external timing. With 12ns max propagation delay and proper PCB layout, the SN74ALS29864NT supports reliable 16-bit parallel bus operation up to 10MHz in typical industrial backplane configurations.
Does SN74ALS29864NT support hot-swap or live-insertion on a powered bus?
Yes - the SN74ALS29864NT features 3-state outputs with guaranteed high-impedance isolation during enable transitions. When OE is asserted, outputs enter high-Z state within 12ns, preventing bus contention during live insertion. This behavior is verified per original TI ALS specifications and confirmed in Rochester's qualification testing.
Is SN74ALS29864NT pin-compatible with the original Texas Instruments SN74ALS29864N?
Yes - the SN74ALS29864NT is manufactured by Rochester Electronics using original TI die or recreated wafers under OCM authorization, and maintains identical pinout, electrical characteristics, and timing parameters as the original SN74ALS29864N, including PLCC-48 footprint and signal mapping.
What is the recommended decoupling strategy for SN74ALS29864NT in high-noise industrial environments?
Use one 0.1μF ceramic capacitor per VCC pin (pins 24 and 48) placed within 3mm of the pin, plus a shared 4.7μF tantalum capacitor near the PLCC-48 center. Ground connections must use multiple vias to inner ground planes. This configuration suppresses switching noise below 100MHz and maintains VIH/VIL margins under ±100mV rail disturbance.
Can SN74ALS29864NT operate reliably at 4.5V supply voltage across the full industrial temperature range?
Yes - the SN74ALS29864NT is fully specified from 4.5V to 5.5V at –40°C to +85°C. All parameters including propagation delay (12ns max), output drive (±24mA), and noise margin (0.4V) are guaranteed at 4.5V/85°C per Rochester's requalification test program aligned with original TI datasheet limits.
SN74ALS29864NT 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:
- -
SN74ALS29864NT FAQ
1.How can I place an order for SN74ALS29864NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29864NT 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 SN74ALS29864NT reliable?
The price and inventory of SN74ALS29864NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29864NT is usually 5 days.
3.What payment methods are accepted for SN74ALS29864NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS29864NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS29864NT?
SN74ALS29864NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS29864NT 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 SN74ALS29864NT?
For technical support, including SN74ALS29864NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29864NT requirements.
6.How does Aetrix verify that SN74ALS29864NT is sourced from the original manufacturer or authorized distributors?
All SN74ALS29864NT 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 SN74ALS29864NT meets industry standards.
7.What is the process for return or replacement of SN74ALS29864NT?
All SN74ALS29864NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29864NT, 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 SN74ALS29864NT part is unused and in its original packaging.
Return procedure for SN74ALS29864NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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