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Texas Instruments SN74BCT29828BNT
- Part No.:
- SN74BCT29828BNT
- Manufacturer:
- Texas Instruments
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- Datasheet:
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SN74BCT29828BNT.pdf
- Description:
- BUS TRANSCEIVER
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Product details
Overview
SN74BCT29828BNT from Texas Instruments is a 10-bit noninverting buffer/driver with dual active-low 3-state enable inputs (OE1, OE2), BiCMOS output stage, 96 mA low-level output drive, and flow-through pinout in 24-pin PDIP (NT) package. It interfaces wide data buses or memory address lines in industrial control backplanes.
For engineers reviewing the SN74BCT29828BNT datasheet, SN74BCT29828BNT pinout, SN74BCT29828BNT application, or SN74BCT29828BNT equivalent, key selection criteria include 3-state timing (tPZL = 9 ns max), high-current drive capability, military-grade ESD protection (2000 V HBM), and compatibility with 5-V TTL/CMOS bus systems.
Technical Context
This device implements a dual-gated 3-state control architecture: both OE1 and OE2 must be low for outputs to drive; either high forces all ten Y outputs into high-impedance. Outputs remain in high-Z during power-up/down, eliminating bus contention risks.
Its BiCMOS design combines bipolar input stages (P-N-P for reduced DC loading) with CMOS-compatible output drivers, achieving 3.5 mA typical ICCZ quiescent current at VCC = 5.5 V while delivering 96 mA sink current per output under recommended conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures robust operation across standard 5-V supply tolerances without level-shifting. |
| IOL per Output | 96 mA - Supports direct driving of heavy capacitive loads (e.g., >100 pF buses) without external buffers. |
| tPZL / tPLZ | 9 ns / 8.1 ns max - Enables fast bus release and enable timing critical for high-speed memory address latching. |
| VIK | –1.2 V - Allows safe interfacing with negative-going transients on legacy TTL bus lines. |
| ESD Rating | 2000 V HBM - Meets MIL-STD-883C for reliability in manufacturing and field-deployed industrial environments. |
| ICCZ | 6 mA max - Low standby current preserves system power budget when outputs are disabled. |
| Input Clamp Current | –18 mA - Protects inputs against overvoltage faults without external diodes. |
Pinout & Package
SN74BCT29828BNT uses a 24-pin plastic dual in-line package (PDIP), designated NT by Texas Instruments. Pin spacing is 0.1 inch, body width 0.3 inch, and lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | OE1, OE2 | Active-low 3-state enables - AND logic ensures outputs disable if either is high; prevents partial bus activation. |
| 2–11 | A1–A10 | Noninverting data inputs - Flow-through layout (A1→Y1, A2→Y2, etc.) minimizes PCB trace crossovers. |
| 13, 12 | GND, VCC | Power pins placed adjacent for low-inductance decoupling - supports stable high-speed switching. |
| 14–23 | Y1–Y10 | 3-state buffered outputs - BiCMOS drivers deliver rail-to-rail swing and high sink current for bus termination. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output pin alignment (A1→Y1, A2→Y2, ..., A10→Y10) reduces PCB routing complexity and signal skew in parallel bus designs. |
| P-N-P input stage | Reduces DC input loading to ≤0.2 mA per input - lowers driver burden on upstream logic and improves fanout. |
| Dual 3-state enable | Independent OE1/OE2 inputs allow hierarchical bus control - e.g., OE1 for local subsystem, OE2 for global bus arbitration. |
| BiCMOS output stage | Combines TTL-compatible voltage levels with CMOS-like low ICCZ (3.5 mA typ) - balances speed, drive, and power efficiency. |
| Power-up/down high-Z | Outputs default to high-impedance during supply ramp - eliminates bus contention during cold start or brownout recovery. |
Applications
| Industrial Backplane Interface | Memory Address Buffering |
|---|---|
Use Scenario: Interfacing microcontroller address/data buses to multi-slot industrial backplanes with long trace runs and multiple load points. IC Role / Device Role / Timing Role: 10-bit unidirectional buffer isolating CPU address lines from distributed peripheral slots; provides current gain and noise margin. Use Value: 96 mA sink current drives ≥10 TTL loads per line; 9 ns tPZL ensures clean bus release before next cycle's address setup. | Use Scenario: Latching and distributing 10-bit memory address signals from a microprocessor to multiple SRAM or EPROM chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting address driver with 3-state control synchronized to memory read/write strobes. Use Value: Flow-through pinout matches standard address bus layouts; dual OE inputs support chip-select prioritization across memory banks. |
| Legacy System Bus Extension | Test Equipment Signal Conditioning |
Use Scenario: Extending aging 5-V TTL bus architectures (e.g., VME, STD Bus) where new peripherals require higher drive strength than original bus drivers. IC Role / Device Role / Timing Role: Drop-in replacement buffer adding drive capability without altering timing budgets or PCB layout. Use Value: Pin-compatible with SN74ALS244/SN74AS244 footprints; 96 mA IOL exceeds ALS (24 mA) and AS (48 mA) families. | Use Scenario: Conditioning digital control signals in automated test equipment (ATE) where precise enable timing and bus isolation are required between DUT interface and controller. IC Role / Device Role / Timing Role: Controlled-enable buffer isolating pattern generator outputs from DUT input capacitance during test vector transitions. Use Value: 8.1 ns tPLZ guarantees sub-10 ns disable timing - critical for glitch-free signal edge alignment in high-speed test vectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS244N | Lower drive (48 mA IOL), faster propagation (3.5 ns tPHL), no dual OE - single enable only. | Suitable for speed-critical but lower-load applications; lacks hierarchical enable control. | Choose when tPHL < 4 ns is mandatory and bus loading ≤5 TTL units. |
| SN74LS244N | Slower (20 ns tPHL), lower drive (24 mA IOL), higher ICC (44 mA ICCL), no BiCMOS - higher power, lower noise immunity. | Fits legacy LS-based designs with tight power budgets but relaxed timing. | Prefer for cost-sensitive, low-speed industrial controllers where BiCMOS benefits are unnecessary. |
Compared with SN74AS244N and SN74LS244N, the SN74BCT29828BNT delivers superior drive strength and controlled 3-state timing while maintaining pinout compatibility with standard 24-pin DIP bus buffers - making it optimal for upgrading legacy bus interfaces without redesign.
Availability
SN74BCT29828BNT is available at Aetrix Electronics and suitable for industrial backplane interface, memory address buffering, and legacy system bus extension requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT29828BNT 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 BCT family was developed to bridge TTL and CMOS logic domains, delivering high-speed, high-drive 3-state buffers with BiCMOS efficiency for industrial bus interface and memory expansion applications.
FAQ
What is the operating temperature range for SN74BCT29828BNT?
The SN74BCT29828BNT is characterized for operation from 0°C to 70°C, matching commercial-grade requirements. This range supports deployment in enclosed industrial cabinets, programmable logic controllers, and test equipment where ambient temperatures remain within standard room-temperature envelopes. The SN74BCT29828BNT does not support extended or military temperature ranges - those are reserved for the SN54BCT29828B variant.
Does SN74BCT29828BNT have pin-to-pin compatibility with SN74ALS244N?
Yes, the SN74BCT29828BNT shares the same 24-pin PDIP (NT) footprint and identical pin functions (A1–A10, Y1–Y10, OE1/OE2, VCC, GND) as SN74ALS244N. However, SN74BCT29828BNT adds dual independent 3-state enables and delivers 96 mA IOL versus 24 mA for the ALS version - enabling direct upgrade without PCB changes.
How does the dual 3-state enable (OE1 and OE2) function in SN74BCT29828BNT?
The SN74BCT29828BNT implements an AND logic function across OE1 and OE2: both inputs must be low for outputs to drive; if either is high, all ten Y outputs enter high-impedance state. This allows hierarchical bus control - for example, OE1 tied to local subsystem enable and OE2 to global bus grant - ensuring deterministic bus arbitration in multi-master systems.
What is the maximum capacitive load SN74BCT29828BNT can drive reliably?
Based on its 96 mA low-level output current and 4.5–5.5 V VCC range, the SN74BCT29828BNT can reliably drive ≥100 pF total bus capacitance while maintaining specified tPHL (≤4.5 ns) and VOL (≤0.5 V) under worst-case conditions. This capacity supports daisy-chained backplane configurations with up to eight downstream TTL loads per line.
Is SN74BCT29828BNT suitable for hot-swap applications?
The SN74BCT29828BNT features power-up/power-down high-impedance behavior: outputs remain in 3-state during VCC ramp, preventing bus contention during insertion. Combined with ±1.2 V input clamp voltage and 2000 V HBM ESD rating, it meets baseline requirements for controlled hot-swap in industrial backplanes - though external current-limiting and sequencing remain system-level responsibilities.
SN74BCT29828BNT 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:
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- Input Type:
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- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SN74BCT29828BNT FAQ
1.How can I place an order for SN74BCT29828BNT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT29828BNT 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 SN74BCT29828BNT reliable?
The price and inventory of SN74BCT29828BNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT29828BNT is usually 5 days.
3.What payment methods are accepted for SN74BCT29828BNT?
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4.How is shipping managed for SN74BCT29828BNT?
SN74BCT29828BNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT29828BNT 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 SN74BCT29828BNT?
For technical support, including SN74BCT29828BNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT29828BNT requirements.
6.How does Aetrix verify that SN74BCT29828BNT is sourced from the original manufacturer or authorized distributors?
All SN74BCT29828BNT 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 SN74BCT29828BNT meets industry standards.
7.What is the process for return or replacement of SN74BCT29828BNT?
All SN74BCT29828BNT units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT29828BNT, 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 SN74BCT29828BNT part is unused and in its original packaging.
Return procedure for SN74BCT29828BNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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