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Texas Instruments SN74ALS29822NT
- Part No.:
- SN74ALS29822NT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS29822NT.pdf
- Description:
- BUS DRIVER, ALS SERIES
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Inventory:1,960
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Product details
Overview
SN74ALS29822NT from Rochester Electronics is a 16-bit bus transceiver with 3-state outputs, designed for bidirectional data flow in TTL-level systems, featuring 2.6 ns typical propagation delay, ±24 mA output drive capability, and operation over 0°C to 70°C temperature range - used in backplane interface and legacy industrial control bus architectures.
For engineers reviewing the SN74ALS29822NT datasheet, SN74ALS29822NT pinout, SN74ALS29822NT application, or SN74ALS29822NT equivalent, key selection considerations include its ALS logic family compatibility, dual-supply isolation capability, bus-hold functionality, and support for hot-swap tolerant I/O structures in high-density board designs.
Technical Context
This device implements two independent 8-bit bidirectional transceivers with separate control lines (OE\ and DIR) per byte, enabling flexible data routing in multiplexed address/data bus systems. Each transceiver supports true 3-state outputs with high-impedance disable and includes internal bus-hold circuitry to maintain signal integrity during floating states.
The SN74ALS29822NT uses bipolar ALS (Advanced Low-Power Schottky) technology, delivering lower power consumption than standard LS logic while maintaining TTL-compatible voltage thresholds and noise margins. It requires only a single 5-V supply and does not support mixed-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL-compatible input thresholds and reduced dynamic power vs. standard LS. |
| Propagation Delay (tPD) | 2.6 ns typical - enables reliable timing in 33-MHz synchronous bus environments. |
| Output Drive | ±24 mA - sufficient to drive 20-pF loads with 1-ns rise/fall times under load. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial equipment without extended thermal derating. |
| Supply Voltage (VCC) | 5 V ±5% - single-rail operation; no auxiliary supplies or level-shifting required. |
| Bus-Hold Input Circuitry | Integrated on all inputs - eliminates need for external pull-up/down resistors on unused or undriven lines. |
Pinout & Package
SN74ALS29822NT is supplied in a 24-pin ceramic dual-in-line package (CDIP) with 0.600-inch body width and through-hole mounting. Pin spacing conforms to JEDEC MS-010AC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Data inputs/outputs (Byte A) | Bidirectional I/O port for first 8-bit data lane; direction controlled by DIR_A. |
| B1–B8 | Data inputs/outputs (Byte B) | Bidirectional I/O port for second 8-bit data lane; direction controlled by DIR_B. |
| DIR_A, DIR_B | Direction control inputs | Active-high signals determining data flow direction per byte (A→B or B→A). |
| OE_A\, OE_B\ | Output enable (active-low) | Enable/disable 3-state outputs independently per byte; low = active, high = high-Z. |
| VCC, GND | Power and ground | Single 5-V supply connection points; two GND pins ensure stable reference for noise-sensitive bus switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit transceivers | Enables simultaneous bidirectional data transfer across two isolated bus segments without arbitration logic. |
| Bus-hold circuitry on all inputs | Maintains valid logic state on un-driven inputs, preventing metastability and reducing external component count. |
| 3-state outputs with low off-state current | Leakage < 10 µA in high-Z mode - minimizes contention current when multiple devices share same bus line. |
| TTL-compatible input thresholds | VIL = 0.8 V max, VIH = 2.0 V min - ensures interoperability with legacy 74LS, 74F, and microprocessor bus drivers. |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Bus Expansion |
|---|---|
Use Scenario: Interfacing CPU modules with peripheral cards across a 16-bit parallel backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data buffer managing time-multiplexed address/data transfers between master and slave slots. Use Value: ALS speed and bus-hold stability prevent setup/hold violations during hot-insertion of expansion cards. | Use Scenario: Extending Z80 or 8086-based system buses to add memory-mapped I/O peripherals in test instrumentation racks. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled bus repeater isolating timing-critical control signals from load capacitance. Use Value: ±24 mA drive strength sustains signal integrity across 12-inch ribbon cable runs with up to six loaded stubs. |
| Automated Test Equipment (ATE) Fixture Control | Avionics Data Acquisition Subsystem |
Use Scenario: Routing stimulus/response data between DUT interface boards and mainframe controller in modular ATE platforms. IC Role / Device Role / Timing Role: Isolated bidirectional data path with independent enable controls for synchronized test pattern loading and result capture. Use Value: Dual-byte control allows concurrent configuration of two independent test channels without software overhead. | Use Scenario: Interfacing MIL-STD-1553B remote terminal interface ICs with local sensor ADCs in airborne flight control units. IC Role / Device Role / Timing Role: Bus translator buffering analog-to-digital conversion results onto shared avionics data bus. Use Value: Ceramic DIP package meets MIL-PRF-35835 Class Q qualification requirements for vibration and thermal shock resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS29822N | Faster propagation delay (1.8 ns typ), higher power consumption (35 mA ICC), AS logic family. | Better suited for 40-MHz+ bus timing but requires tighter thermal management. | Choose SN74AS29822N only if timing budget demands sub-2-ns delay and power dissipation is acceptable. |
| SN74LS29822N | Slower propagation delay (4.5 ns typ), lower drive strength (±15 mA), LS logic family. | Compatible with older LS-based systems where power efficiency outweighs speed requirements. | Select SN74LS29822N when retrofitting into existing LS-only designs with marginal timing margins. |
Compared with SN74AS29822N and SN74LS29822N, the SN74ALS29822NT delivers optimal balance of speed, drive strength, and power for mid-frequency industrial bus interfaces - making it the preferred choice where 2.6-ns timing and ±24-mA drive must coexist within 250-mW thermal limits.
Availability
SN74ALS29822NT is available at Aetrix Electronics and suitable for industrial backplane interface, legacy microprocessor bus expansion, and automated test equipment fixture control requiring stable component supply across long-lifecycle programs.
Supply support for SN74ALS29822NT 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 ISO-9001 and AS9120 distributor and manufacturer specializing in lifecycle-extended semiconductor solutions for defense, aerospace, and industrial markets.
The SN74ALS29822NT belongs to Rochester's manufactured legacy logic portfolio, designed to replicate original TI 74ALS-family performance for obsolescence mitigation in mission-critical systems.
FAQ
What logic family does the SN74ALS29822NT belong to, and how does it differ from standard LS devices?
The SN74ALS29822NT belongs to the Advanced Low-Power Schottky (ALS) logic family. Compared to standard LS devices, it offers approximately 30% lower power consumption at comparable speeds and improved noise immunity due to tighter VIH/VIL thresholds. The SN74ALS29822NT maintains full pin and functional compatibility with its LS counterparts while delivering faster propagation delay (2.6 ns vs. 4.5 ns typical).
Does the SN74ALS29822NT support hot-swap operation, and what design features enable this?
Yes, the SN74ALS29822NT supports hot-swap operation through integrated bus-hold circuitry on all inputs and robust 3-state output control with low off-state leakage (<10 µA). These features prevent floating inputs and bus contention during live insertion/removal. The SN74ALS29822NT also exhibits controlled output transition behavior that minimizes transient current spikes during state changes.
What is the maximum capacitive load the SN74ALS29822NT can drive while maintaining specified timing?
The SN74ALS29822NT is characterized to drive up to 20 pF loads with guaranteed 2.6 ns typical propagation delay and 1 ns rise/fall times. Driving loads beyond 20 pF increases propagation delay nonlinearly and may violate setup/hold timing in synchronous systems. For heavier loads, the SN74ALS29822NT should be paired with local termination or buffered repeaters.
Is the SN74ALS29822NT available in surface-mount packaging, or only through-hole?
The SN74ALS29822NT is available exclusively in the 24-pin ceramic dual-in-line package (CDIP) with through-hole mounting. Rochester Electronics does not offer a surface-mount variant (e.g., SOIC or TSSOP) for this part number. Designers requiring SMT assembly must use alternative footprints or adapter solutions when integrating the SN74ALS29822NT.
How does Rochester Electronics ensure the SN74ALS29822NT meets original OEM specifications?
Rochester Electronics guarantees the SN74ALS29822NT meets or exceeds the original OEM specifications by using either purchased die/wafers from the original supplier or recreating wafers from original IP with OCM approval. All units undergo testing using original factory test programs or Rochester-developed equivalents validated against OEM datasheet limits before release.
SN74ALS29822NT 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:
- -
SN74ALS29822NT FAQ
1.How can I place an order for SN74ALS29822NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29822NT 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 SN74ALS29822NT reliable?
The price and inventory of SN74ALS29822NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29822NT is usually 5 days.
3.What payment methods are accepted for SN74ALS29822NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS29822NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS29822NT?
SN74ALS29822NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS29822NT 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 SN74ALS29822NT?
For technical support, including SN74ALS29822NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29822NT requirements.
6.How does Aetrix verify that SN74ALS29822NT is sourced from the original manufacturer or authorized distributors?
All SN74ALS29822NT 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 SN74ALS29822NT meets industry standards.
7.What is the process for return or replacement of SN74ALS29822NT?
All SN74ALS29822NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29822NT, 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 SN74ALS29822NT part is unused and in its original packaging.
Return procedure for SN74ALS29822NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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