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Texas Instruments SN74ALS29863DW
- Part No.:
- SN74ALS29863DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS29863DW.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
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Product details
Overview
SN74ALS29863DW from Texas Instruments is a 9-bit bidirectional transceiver with independent A→B and B→A data paths, four output-enable controls (OEAB1/OEAB2/OEBA1/OEBA2), ±24 mA high-level/48 mA low-level drive capability, and operation over 0°C to 70°C. It enables asynchronous bus isolation and direction control in industrial backplane and legacy system interconnects.
For engineers reviewing the SN74ALS29863DW datasheet, SN74ALS29863DW pinout, SN74ALS29863DW application, or SN74ALS29863DW equivalent, key selection considerations include its dual-directional enable logic, 3-state isolation timing (tPZL ≤ 15 ns at CL = 50 pF), ALS-family propagation delay (tPLH/tPHL ≤ 8 ns at CL = 50 pF), and SOIC-24 package compatibility with legacy 300-mil DIP footprints.
Technical Context
This device implements two independent 9-bit bidirectional data channels using TTL-compatible ALS logic. Each channel supports latched operation (all OE inputs low) or directional transmission via separate OEABx (A-to-B) and OEBAx (B-to-A) controls - enabling simultaneous A→B and B→A transfers when configured with non-overlapping enables.
It features power-up high-impedance outputs, absolute maximum ratings up to 7 V VCC and 5.5 V VI, and guaranteed operation under 4.75–5.25 V supply with VIH ≥ 2 V and VIL ≤ 0.8 V. Switching performance is specified for CL = 50 pF and CL = 300 pF loads, supporting both fast local-bus and longer trace interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - ensures stable operation within standard 5 V TTL supply tolerance bands |
| IOH / IOL | −24 mA / +48 mA - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| tPLH / tPHL | ≤ 8 ns (CL = 50 pF) - supports >100 MHz bus toggle rates in short-trace configurations |
| tPZL / tPHZ | ≤ 15 ns (CL = 50 pF) - enables rapid bus arbitration and dynamic direction switching |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded systems and industrial control panels |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - provides noise margin against ground bounce and crosstalk in dense PCB layouts |
| ICC (max) | 65 mA - allows predictable power budgeting in multi-transceiver bus interface designs |
Pinout & Package
SN74ALS29863DW uses a 24-pin SOIC (DW) package with 300-mil width, 1.27 mm pitch, and JEDEC MS-013 compliant footprint. Pin 1 is top-left corner marker; pins 1–12 occupy top row left-to-right, pins 13–24 bottom row right-to-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEBA1 | Active-low enable for B→A data transfer on channels 1–9; must be low with OEBA2 low to activate B bus drivers |
| 2 | A1 | Input/output terminal for A-side data bit 1; high-impedance when all OEBAx are high |
| 3–9 | A2–A9 | A-side I/O bits 2–9; share same enable logic as A1; support bidirectional data flow under OE control |
| 10 | OEBA2 | Second active-low enable for B→A path; used with OEBA1 for redundancy or split-bus control |
| 11 | OEAB1 | Active-low enable for A→B data transfer; low with OEAB2 low to activate A bus drivers toward B side |
| 12 | GND | Power ground reference for all internal logic and I/O stages; requires low-inductance connection |
| 13 | VCC | +5 V supply input; bypass capacitor (0.1 µF) required near pin for transient current stability |
| 14–22 | B1–B9 | B-side I/O bits 1–9; electrically identical to A-side terminals but isolated by enable logic |
| 23 | OEAB2 | Second active-low enable for A→B path; supports independent gating of subsets of A→B channels |
| 24 | NC | No connect - internally unconnected; must remain floating or grounded per board layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent direction control | Separate OEABx and OEBAx inputs allow concurrent A→B and B→A transfers without bus contention |
| Power-up 3-state | Outputs remain high-impedance until valid enable signals stabilize - prevents glitch-induced bus conflicts |
| ALS logic family speed | 8 ns propagation delay at 50 pF enables use in high-speed legacy bus interfaces (e.g., VME, Multibus II) |
| High drive strength | 48 mA sink current supports direct driving of 10+ standard TTL loads per output |
| Functionally equivalent to AM29863 | Drop-in replacement for AMD's AM29863 in existing designs - identical pinout, timing, and DC specs |
Applications
| Industrial Backplane Interconnect | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Isolating and extending parallel data buses between CPU and I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional transceiver managing A→B (CPU→I/O) and B→A (I/O→CPU) traffic with independent enable control per direction. Use Value: Eliminates need for discrete direction-control logic and level-shifting components while maintaining sub-10 ns timing integrity across 200 mm traces. |
Use Scenario: Adding peripheral slots to aging computer architectures like Multibus II or STD Bus systems. IC Role / Device Role / Timing Role: 9-bit bus repeater with latch mode for static address/data staging and transparent mode for real-time data streaming. Use Value: Preserves original system timing margins due to ALS-family propagation delay matching and guaranteed 0–70°C operation. |
| Test Equipment Data Path Switching | Modular Instrumentation Chassis |
|
Use Scenario: Routing measurement data between digitizers, signal generators, and processing units inside automated test systems. IC Role / Device Role / Timing Role: Directionally configurable data bridge enabling reconfigurable signal flow paths under microcontroller command. Use Value: Four independent OE inputs permit fine-grained per-channel enable/disable - critical for synchronized multi-instrument triggering. |
Use Scenario: Supporting hot-swappable module communication in modular instrumentation chassis with shared backplane. IC Role / Device Role / Timing Role: Isolation buffer preventing fault propagation between modules during insertion/removal sequences. Use Value: Power-up high-impedance state ensures no bus loading during module power sequencing - avoids system reset events. |
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 |
|---|---|---|---|
| SN74AS29863DW | Faster propagation delay (tPLH/tPHL ≤ 4.5 ns at CL = 50 pF) but higher ICC (max 110 mA); AS-family input thresholds differ (VIH ≥ 2.0 V, VIL ≤ 0.5 V) | Required where sub-5 ns timing is mandatory; not drop-in due to increased power and tighter VIL spec | Select SN74AS29863DW only if timing budget demands <5 ns delay and power delivery supports 110 mA peak draw. |
| AM29863PC | Identical function, pinout, and DC specs; packaged in 300-mil plastic DIP (NT); same 0–70°C rating and ALS logic family | Preferred for through-hole prototyping or legacy DIP-based systems requiring manual assembly | Choose AM29863PC when board layout mandates DIP footprint or hand-soldering is required; otherwise SN74ALS29863DW offers superior density and reflow compatibility. |
Compared with SN74ALS29863DW, SN74AS29863DW trades higher power for faster switching, while AM29863PC retains full functional equivalence in a through-hole package - making the DW variant optimal for modern surface-mount industrial control designs requiring reliability and space efficiency.
Availability
SN74ALS29863DW is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy system bus extension, and modular instrumentation chassis requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74ALS29863DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS29863DW belongs to TI's legacy ALS logic family, designed specifically for high-reliability, medium-speed bus interface applications in commercial-temperature industrial systems.
FAQ
What is the primary function of the SN74ALS29863DW?
The SN74ALS29863DW is a 9-bit bidirectional transceiver that enables controlled data flow between two parallel buses (A and B sides) using four independent output-enable inputs. It supports latched operation, A→B transmission, B→A transmission, and full 3-state isolation - making it ideal for bus arbitration and interconnect isolation in industrial control systems. Its ALS logic ensures reliable timing at 5 V with robust noise immunity.
Does the SN74ALS29863DW support true bidirectional operation on the same pins?
Yes, the SN74ALS29863DW supports true bidirectional I/O on both A1–A9 and B1–B9 pins. Each A-side pin connects to its corresponding B-side pin through a bidirectional buffer whose direction is determined by the logic states of OEABx (for A→B) and OEBAx (for B→A). When both OEABx and OEBAx are high, all I/O pins enter high-impedance state - ensuring no bus contention occurs during direction changes.
What are the absolute maximum ratings for the SN74ALS29863DW?
The SN74ALS29863DW has an absolute maximum VCC of 7 V, input voltage limit of 5.5 V on all pins, and operating free-air temperature range of 0°C to 70°C. Storage temperature spans −65°C to 150°C. Exceeding these limits may cause permanent damage; functional operation is only guaranteed within the recommended conditions: VCC = 4.75–5.25 V, VIH ≥ 2.0 V, VIL ≤ 0.8 V, and TA = 0–70°C.
Is the SN74ALS29863DW pin-compatible with the AM29863?
Yes, the SN74ALS29863DW is functionally and pin-compatible with AMD's AM29863. Both devices share identical pin assignments, electrical specifications, timing parameters, and logic behavior - including the same four-output-enable architecture and latch mode functionality. This allows direct substitution in existing AM29863 designs without PCB or firmware modifications.
What package type does the SN74ALS29863DW use, and what are its key mechanical dimensions?
The SN74ALS29863DW uses a 24-pin SOIC (DW) package with 300-mil body width, 1.27 mm lead pitch, and JEDEC MS-013 outline. Its tube packaging contains 25 units per tube, and it carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). The package marking "ALS29863" appears on the top surface, and the device is RoHS-compliant with NiPdAu lead finish.
SN74ALS29863DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ALS29863DW FAQ
1.How can I place an order for SN74ALS29863DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29863DW 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 SN74ALS29863DW reliable?
The price and inventory of SN74ALS29863DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29863DW is usually 5 days.
3.What payment methods are accepted for SN74ALS29863DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS29863DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS29863DW?
SN74ALS29863DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS29863DW 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 SN74ALS29863DW?
For technical support, including SN74ALS29863DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29863DW requirements.
6.How does Aetrix verify that SN74ALS29863DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS29863DW 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 SN74ALS29863DW meets industry standards.
7.What is the process for return or replacement of SN74ALS29863DW?
All SN74ALS29863DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29863DW, 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 SN74ALS29863DW part is unused and in its original packaging.
Return procedure for SN74ALS29863DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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