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Texas Instruments SN74BCT29828BDW
- Part No.:
- SN74BCT29828BDW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74BCT29828BDW.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
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Inventory:950
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Product details
Overview
SN74BCT29828BDW from Texas Instruments is a 10-bit non-inverting 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 for memory address bus interfacing in industrial control systems.
For engineers reviewing the SN74BCT29828BDW datasheet, SN74BCT29828BDW pinout, SN74BCT29828BDW application, or SN74BCT29828BDW equivalent, key selection criteria include 3-state timing (tPZL = 2 ns min, tPLZ = 2 ns min), VCC = 4.5–5.5 V operation, high-impedance retention during power-up/down, and DW package thermal performance at 0°C to 70°C.
Technical Context
This device implements two independent 2-input AND gates driving a shared 10-bit output buffer array, where either OE1 or OE2 high forces all Y1–Y10 into high-impedance. The P-N-P input structure reduces DC loading on upstream logic, while BiCMOS outputs deliver fast switching (tPHL = 1 ns min) with low ICCZ quiescent current (6 mA max).
It supports wide data path buffering with flow-through architecture: A1–A10 enter on left side, Y1–Y10 exit on right side, and OE1/OE2 are positioned for minimal trace length in bus-enable routing. NC pins (pins 4, 12, 13, 25, 26) are unconnected internally and must remain unbonded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems without level-shifting |
| IOL (max) | 96 mA - drives heavy capacitive loads (e.g., >100 pF buses) without signal degradation |
| tPLH / tPHL | 1 ns (min) - enables sub-ns timing margins in high-speed address latching applications |
| ICCZ (max) | 6 mA - minimizes standby power in powered-down bus segments |
| VIK | –1.2 V - provides robust negative transient immunity on input lines |
| Co | 7 pF - limits capacitive loading on driven bus nodes, preserving edge rate integrity |
Pinout & Package
SN74BCT29828BDW uses a 24-pin SOIC (DW) package with 300-mil width, gull-wing leads, and JEDEC MS-013AC footprint. Pin 1 is marked by bevelled corner; pin count and layout match industry-standard 24-pin SOIC footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1, OE2 | Active-low 3-state enable inputs | AND-gated control: either high disables all outputs; both low required for valid Y1–Y10 drive |
| A1–A10 | Non-inverting data inputs | Directly buffered to corresponding Y outputs; P-N-P input structure lowers input current draw |
| Y1–Y10 | 3-state non-inverting outputs | BiCMOS drivers support 96 mA sink, 24 mA source, and fast transition into/out of high-Z |
| VCC, GND | Power supply terminals | Single 5 V rail; decoupling capacitor required within 10 mm of pins 12 (GND) and 13 (VCC) |
| NC (pins 4,12,13,25,26) | No internal connection | Must remain unconnected on PCB; no pull-up/down or routing allowed |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input A1–A10 on left, output Y1–Y10 on right - eliminates layer jumps and reduces crosstalk in dense PCB layouts |
| Power-cycle safe 3-state | Outputs remain high-impedance during power-up/down - prevents bus contention in hot-swap or sequenced supply systems |
| BiCMOS output stage | Combines bipolar speed and CMOS low ICCZ - achieves 1 ns propagation delay with only 6 mA quiescent current |
| P-N-P input structure | Reduces input current to ±0.2 mA - eases drive requirements from legacy TTL or low-power logic stages |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Buffering 10-bit microprocessor address lines (A0–A9) to drive multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer enabling/disabling address propagation to memory banks under OE1/OE2 control. Use Value: Flow-through pinout simplifies routing; 96 mA IOL ensures reliable drive across 10+ memory devices with 50–100 pF total load. | Use Scenario: Isolating programmable logic controller (PLC) I/O expansion modules from main backplane bus. IC Role / Device Role / Timing Role: Bidirectional bus driver controlled by PLC firmware via OE1/OE2 to gate data flow between CPU and peripheral modules. Use Value: High-impedance retention during reset prevents spurious writes; tPZL/tPLZ < 3 ns supports 100+ MHz bus arbitration cycles. |
| Test Equipment Signal Routing | Legacy System Bus Extension |
Use Scenario: Multiplexing test signals from automated test equipment (ATE) to DUT pins using parallel 10-bit paths. IC Role / Device Role / Timing Role: 3-state buffer enabling precise time-gated signal injection or capture on dedicated test bus segments. Use Value: Sub-ns propagation delay preserves signal integrity; VIH/VIL thresholds ensure compatibility with mixed-voltage ATE logic families. | Use Scenario: Extending ISA or VMEbus address/data paths in retro-computing or avionics maintenance systems. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74F244/74AS244 in 5 V bus repeater designs requiring higher drive strength. Use Value: Pin-compatible with standard 24-pin SOIC footprint; 96 mA IOL exceeds AS-family specs by 2×, supporting longer trace runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | Octal (8-bit), not 10-bit; 64 mA IOL; different pinout (dual OE per 4-bit group) | Requires two devices for 10-bit coverage; incompatible flow-through layout | Select when octal grouping aligns with system partitioning and lower drive (64 mA) suffices |
| SN74LVC244APWR | 3.3 V only (1.65–3.6 V); 24 mA IOL; CMOS-only (no BiCMOS speed boost) | Not compatible with 5 V systems; unsuitable for legacy bus extension | Choose only for new 3.3 V designs needing ultra-low ICC and smaller TSSOP package |
Compared with SN74ABT244N and SN74LVC244APWR, the SN74BCT29828BDW uniquely delivers 10-bit width, 5 V operation, 96 mA drive, and flow-through routing in a single 24-pin SOIC - making it irreplaceable for space-constrained 5 V address bus extensions requiring single-package integration.
Availability
SN74BCT29828BDW is available at Aetrix Electronics and suitable for industrial control systems, test equipment signal routing, and legacy 5 V bus extension applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT29828BDW 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 designed for high-speed 5 V TTL-compatible bus interface applications, emphasizing low ICCZ, robust ESD protection (>2 kV HBM), and layout-optimized pinouts for memory and control subsystems.
FAQ
What is the operating temperature range for SN74BCT29828BDW?
The SN74BCT29828BDW is characterized for operation from 0°C to 70°C ambient temperature. This commercial-grade rating aligns with standard industrial control and test equipment environments. It does not support extended temperature ranges like the military-grade SN54BCT29828B (–55°C to 125°C). Thermal derating is not specified beyond this range, and operation outside 0°C–70°C voids TI's warranty for the SN74BCT29828BDW.
Does SN74BCT29828BDW require external pull-up resistors on its outputs?
No, the SN74BCT29828BDW does not require external pull-up resistors on Y1–Y10 outputs. Its BiCMOS outputs actively drive both high and low states, with VOH ≥ 2.4 V at IOL = –24 mA and VOL ≤ 0.55 V at IOL = 24 mA under recommended conditions. Pull-ups would interfere with defined logic levels and increase power consumption unnecessarily. The SN74BCT29828BDW is designed for direct bus termination.
How does the dual OE architecture of SN74BCT29828BDW improve system reliability?
The dual active-low OE inputs (OE1 and OE2) in the SN74BCT29828BDW implement an AND logic function: both must be low for outputs to drive. This allows independent control from separate system domains (e.g., CPU and DMA controller), preventing bus contention if one controller asserts OE while the other does not. During power sequencing, both OEs default high, forcing high-Z - a feature confirmed in the SN74BCT29828BDW datasheet for safe startup.
Can SN74BCT29828BDW be used with 3.3 V logic inputs?
Yes, SN74BCT29828BDW accepts 3.3 V logic inputs safely: its VIH threshold is 2.0 V (min), and absolute maximum input voltage is 7 V. A 3.3 V CMOS signal meets VIH and stays well below VCC + 0.5 V stress limit. However, outputs swing to 5 V levels, so interfacing with 3.3 V receivers requires level translation unless they are 5 V tolerant - a constraint explicitly documented for the SN74BCT29828BDW.
What is the significance of the NC pins on SN74BCT29828BDW?
The NC pins (4, 12, 13, 25, 26) on SN74BCT29828BDW have no internal connection and must remain unconnected on the PCB. TI's datasheet explicitly states "NC – No internal connection", and soldering or routing to these pins risks shorting adjacent traces or violating SOIC mechanical clearance. Leaving them floating is mandatory; no pull-up, pull-down, or grounding is permitted for the SN74BCT29828BDW.
SN74BCT29828BDW 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:
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- Mounting Type:
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- Supplier Device Package:
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SN74BCT29828BDW FAQ
1.How can I place an order for SN74BCT29828BDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT29828BDW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74BCT29828BDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT29828BDW is usually 5 days.
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5.How can I obtain technical support or documentation for SN74BCT29828BDW?
For technical support, including SN74BCT29828BDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT29828BDW requirements.
6.How does Aetrix verify that SN74BCT29828BDW is sourced from the original manufacturer or authorized distributors?
All SN74BCT29828BDW 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 SN74BCT29828BDW meets industry standards.
7.What is the process for return or replacement of SN74BCT29828BDW?
All SN74BCT29828BDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT29828BDW, 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 SN74BCT29828BDW part is unused and in its original packaging.
Return procedure for SN74BCT29828BDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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