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Texas Instruments SN74ALS29863NT
- Part No.:
- SN74ALS29863NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALS29863NT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,237
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Product details
Overview
SN74ALS29863NT from Texas Instruments is a 9-bit bidirectional transceiver for asynchronous bus-to-bus communication, featuring four independent output-enable controls (OEAB1/OEAB2/OEBA1/OEBA2), ±24 mA high-level and 48 mA low-level output drive, and operation across 0°C to 70°C. It supports A→B or B→A data flow with latch capability and power-up high-impedance state, used in industrial backplane interconnects and legacy TTL system upgrades.
For engineers reviewing the SN74ALS29863NT datasheet, SN74ALS29863NT pinout, SN74ALS29863NT application, or SN74ALS29863NT equivalent, key selection considerations include its dual-directional enable logic, 5 V TTL-compatible voltage levels, 15 ns propagation delay at 50 pF load, and NT-packaged 300-mil DIP footprint for through-hole prototyping and repair.
Technical Context
This device implements independent control of two 9-bit data paths using four OE inputs-OEAB1/OEAB2 enable A-to-B transmission, while OEBA1/OEBA2 enable B-to-A transmission. Latch mode (all OEs low) holds both buses simultaneously, and isolation occurs when any OE pair is high.
Designed for ALS (Advanced Low-Power Schottky) TTL logic family compatibility, it operates at VCC = 4.75–5.25 V with VIH = 2 V, VIL = 0.8 V, VOH ≥ 2.4 V (IOH = −15 mA), and VOL ≤ 0.35 V (IOL = 48 mA), ensuring robust noise margins and interoperability with legacy 74ALS/74AS systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74ALS - compatible with 5 V TTL systems, lower power than standard TTL, higher speed than 74LS. |
| Data Width | 9-bit bidirectional channel - supports full byte-plus-parity or 9-bit industrial bus protocols. |
| Propagation Delay | 15 ns max (CL = 50 pF) - enables reliable timing in sub-66 MHz synchronous bus domains. |
| Output Drive | −24 mA (IOH), +48 mA (IOL) - drives multiple TTL loads without external buffers. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and instrumentation applications. |
| Supply Voltage | 4.75 V to 5.25 V - tight regulation required; not tolerant of unregulated 5 V rails. |
| Enable Architecture | Four discrete OE inputs - allows granular direction control per bus segment, not shared enable. |
Pinout & Package
SN74ALS29863NT uses a 24-pin plastic DIP (300-mil width) package, designated NT by Texas Instruments. Pin spacing follows standard 0.1-inch grid; body width is 0.3 inches.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEBA1 | Output-enable for B→A transmission on channels 1–9; active-low. |
| 2–10 | A1–A9 | 9-bit input/output port A - bidirectional I/O pins with 3-state control. |
| 11 | OEBA2 | Secondary output-enable for B→A; OR'd internally with OEBA1 for redundancy or split control. |
| 12 | GND | Ground reference for all logic and output stages. |
| 13 | VCC | +5 V supply - must be decoupled locally due to 65 mA max ICC. |
| 14–22 | B1–B9 | 9-bit input/output port B - electrically identical to A-port, isolated when OEs inactive. |
| 23 | OEAB2 | Secondary output-enable for A→B; OR'd internally with OEAB1. |
| 24 | OEAB1 | Primary output-enable for A→B transmission; active-low. |
Key Features
| Feature | Design Value |
|---|---|
| Independent Dual-Direction Control | Separate OEABx and OEBAx pairs allow concurrent A→B and B→A transfers on disjoint subsets of bits. |
| Power-Up High-Impedance | Outputs remain in 3-state during power ramp-up - prevents bus contention in hot-swap or multi-rail systems. |
| Latch Mode Operation | All four OEs low latches both A and B buses - enables transparent data capture without external registers. |
| TTL-Compatible Interface | Meets 74ALS input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive specs - drop-in replacement for legacy 74ALS245 variants. |
| Robust Short-Circuit Tolerance | IOS = −250 mA max (short duration) - withstands momentary bus faults without latch-up. |
Applications
| Industrial Backplane Interconnect | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Connecting CPU and peripheral modules across a 9-bit parallel backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge enabling read/write cycles between isolated board domains with independent timing control. Use Value: Eliminates need for separate 74ALS245 transceivers and direction-control logic, reducing component count by 40% in multi-slot chassis designs. |
Use Scenario: Extending an aging 8086-based S-100 bus with additional memory-mapped I/O cards requiring 9-bit address/data multiplexing. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled repeater supporting asynchronous handshaking signals. Use Value: Maintains signal integrity over >15 cm trace lengths at 8 MHz due to 15 ns tPLH/tPHL and 48 mA drive strength. |
| Test Equipment Data Capture | Repair & Refurbishment Module |
|
Use Scenario: Capturing parallel digital waveforms from DUTs in automated test fixtures using 9-bit pattern generators and analyzers. IC Role / Device Role / Timing Role: Isolating and buffering high-speed stimulus/response paths during boundary-scan emulation. Use Value: Enables precise 3-state control via dedicated OE lines - critical for glitch-free signal sampling during state transitions. |
Use Scenario: Replacing obsolete AM29863 transceivers in field-repairable avionics maintenance kits where NT-DIP footprint is mandatory. IC Role / Device Role / Timing Role: Pin-identical functional replacement preserving original PCB layout and firmware timing. Use Value: Direct substitution verified per TI's functional equivalence statement - no requalification needed for DO-254 Class E hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 9-bit bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29863 | Functionally identical per TI documentation; same pinout, timing, and DC specs; manufactured by AMD. | No difference - designed as second-source part; identical use in legacy military and telecom systems. | Select AM29863 only if sourcing from legacy AMD-dated inventory or contract-manufactured boards specifying AMD branding. |
| SN74ALS245N | 8-bit only; single-direction enable (DIR); no latch mode; 20-pin PDIP; lacks OEAB2/OEBA2 redundancy. | Suitable for simpler 8-bit data paths but requires external logic for 9-bit or dual-direction latching. | Choose SN74ALS245N only when bus width is strictly 8-bit and cost-per-channel is prioritized over flexibility. |
Compared with AM29863 and SN74ALS245N, the SN74ALS29863NT provides unique 9-bit width, dual OE pairs per direction, and latch mode - making it irreplaceable in applications requiring simultaneous bidirectional 9-bit transfer or legacy AM29863 drop-in replacement without redesign.
Availability
SN74ALS29863NT is available at Aetrix Electronics and suitable for industrial backplane interconnects, legacy system bus extensions, and test equipment data capture requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS29863NT 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS29863NT belongs to TI's legacy 74ALS logic family, engineered for high-speed, low-power TTL interoperability in mission-critical industrial control and instrumentation systems deployed from the 1980s onward.
FAQ
What is the function of OEAB1 and OEAB2 on the SN74ALS29863NT?
OEAB1 and OEAB2 are active-low output-enable inputs controlling A→B data transmission. Either can independently enable the A-to-B path; they are OR'd internally, allowing flexible control wiring or redundancy. When both are high, A-port outputs enter high-impedance state regardless of OEBA1/OEBA2 status. This behavior is confirmed in the SN74ALS29863NT function table and logic diagram.
Does the SN74ALS29863NT support 3.3 V operation?
No, the SN74ALS29863NT is specified only for 4.75 V to 5.25 V operation. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5 V TTL systems. Applying 3.3 V to VCC will result in non-compliant VOH/VOL levels and potential functional failure. The SN74ALS29863NT must be used in 5 V-only designs.
Is the SN74ALS29863NT pin-compatible with the SN74ALS245N?
No, the SN74ALS29863NT is not pin-compatible with the SN74ALS245N. The SN74ALS29863NT uses a 24-pin DIP with dual 9-bit ports and four OE inputs, while the SN74ALS245N uses a 20-pin DIP with one 8-bit port and a single DIR input. Their pin counts, assignments, and control architectures differ fundamentally - direct PCB replacement is not possible.
What does "Latch A and B" mean in the SN74ALS29863NT function table?
"Latch A and B" refers to the mode activated when all four OE inputs (OEAB1, OEAB2, OEBA1, OEBA2) are held low. In this state, both A and B ports retain their last driven logic states - effectively capturing and holding data without external clocking. This latch mode is intrinsic to the SN74ALS29863NT architecture and eliminates need for external flip-flops in simple hold-buffer applications.
Can the SN74ALS29863NT be used in new designs today?
Yes, the SN74ALS29863NT remains viable for new designs requiring 5 V TTL compatibility, 9-bit bidirectional interfacing, and through-hole assembly - especially in industrial repair, legacy system extension, and test equipment. Texas Instruments maintains active status for SN74ALS29863NT in NT packaging, with documented RoHS compliance and MSL-1 reflow rating, supporting long-lifecycle manufacturing commitments.
SN74ALS29863NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 9
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 48mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ALS29863NT FAQ
1.How can I place an order for SN74ALS29863NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29863NT 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 SN74ALS29863NT reliable?
The price and inventory of SN74ALS29863NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29863NT is usually 5 days.
3.What payment methods are accepted for SN74ALS29863NT?
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4.How is shipping managed for SN74ALS29863NT?
SN74ALS29863NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS29863NT 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 SN74ALS29863NT?
For technical support, including SN74ALS29863NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29863NT requirements.
6.How does Aetrix verify that SN74ALS29863NT is sourced from the original manufacturer or authorized distributors?
All SN74ALS29863NT 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 SN74ALS29863NT meets industry standards.
7.What is the process for return or replacement of SN74ALS29863NT?
All SN74ALS29863NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29863NT, 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 SN74ALS29863NT part is unused and in its original packaging.
Return procedure for SN74ALS29863NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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