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Texas Instruments SN74BCT25244DB
- Part No.:
- SN74BCT25244DB
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74BCT25244DB.pdf
- Description:
- BUFFER/LINE DRIVER 8-CH NON-INVE
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Inventory:342
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Product details
Overview
SN74BCT25244DB from Texas Instruments is a 25-Ω octal buffer/driver with 3-state outputs, designed for incident-wave switching on 25-Ω transmission lines in memory address and clock distribution systems. It delivers 188-mA low-level output current (IOL), operates at 4.5–5.5 V supply, and supports 0°C to 70°C industrial temperature range in SOIC-24 (DW) package.
For engineers reviewing the SN74BCT25244DB datasheet, SN74BCT25244DB pinout, SN74BCT25244DB application, or SN74BCT25244DB equivalent, key selection criteria include 3-state bus driving capability, 25-Ω line impedance matching, distributed VCC/GND noise suppression, and BiCMOS low ICCZ quiescent current performance.
Technical Context
This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (1OE, 2OE). Each buffer drives one A-input to corresponding Y-output; high OE forces high-impedance output state. The BiCMOS architecture enables fast switching (tPLH/tPHL ≤ 5.5 ns @ 5 V) while minimizing ground bounce via distributed power/ground pins.
It is optimized for incident-wave switching on controlled-impedance PCB traces ≥25 Ω, not termination-based reflection management. Electrical behavior is specified under strict recommended conditions: VIH = 2 V min, VIL = 0.8 V max, IOL = 188 mA, and VOL ≤ 0.55 V at 94 mA load - confirming robust low-voltage logic compatibility and drive strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and margin against rail droop. |
| Low-Level Output Current (IOL) | 188 mA - sufficient to drive 25-Ω transmission lines on incident wave without overshoot or reflection-induced timing errors. |
| Propagation Delay (tPLH/tPHL) | ≤5.5 ns @ 5 V - enables high-speed address or clock distribution in dense memory subsystems. |
| Quiescent Supply Current (ICCZ) | 7–11 mA - significantly reduced vs. bipolar-only equivalents, lowering system power and thermal load during 3-state hold. |
| Input Clamp Current (IIK) | –18 mA - protects inputs from ESD transients exceeding 2000 V (MIL-STD-883C) and 200 V (machine model). |
| Output Leakage (IOZH/IOZL) | ±50 µA - guarantees reliable high-impedance isolation when enabled, preventing bus contention in multi-driver systems. |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial embedded applications requiring stable timing over ambient range. |
Pinout & Package
SN74BCT25244DB is packaged in SOIC-24 (DW) per TI's ordering nomenclature. Pin assignments are identical across DW, NT, JT, and W packages per datasheet top-view diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output Enable (active-low) | Independent control of two 4-bit buffer groups; low = pass-through, high = high-Z - enables flexible bus arbitration. |
| 1A1–1A4, 2A1–2A4 | Data Inputs | Eight TTL-compatible inputs accepting VIH ≥ 2 V, VIL ≤ 0.8 V - interoperable with legacy 5-V logic families. |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered Outputs | 25-Ω matched drivers capable of sinking 188 mA - optimized for clean edge launch onto controlled-impedance traces. |
| VCC (Pins 4, 11, 22) | Power Supply | Distributed VCC pins reduce simultaneous-switching noise by decoupling current paths across the die. |
| GND (Pins 2, 5, 8, 13, 16, 19) | Ground Return | Six dedicated GND pins minimize ground bounce and improve signal integrity during full-bus switching. |
| NC (Pins 7, 10, 15, 18) | No Internal Connection | Unbonded pads - must remain unconnected to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω Output Impedance Matching | Enables incident-wave switching on 25-Ω PCB traces without external series termination resistors - reduces component count and layout area. |
| Distributed VCC/GND Pins | Six GND and three VCC pins suppress simultaneous switching noise (SSN), improving signal integrity in high-density memory/address buses. |
| BiCMOS Process Technology | Combines bipolar speed and CMOS input characteristics - achieves 5.5-ns propagation delay with 11-mA ICCZ quiescent current. |
| ESD Protection | Exceeds 2000 V HBM and 200 V machine model - eliminates need for external ESD protection in board-level designs. |
| 3-State Dual-Group Control | Separate 1OE/2OE inputs allow independent enabling of two 4-bit channels - simplifies bus partitioning and hot-swap sequencing. |
Applications
| Memory Address Drivers | Clock Distribution Networks |
|---|---|
Use Scenario: Driving parallel address buses between microcontrollers and SRAM/ROM chips on compact PCBs with tight trace-length constraints. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address lines during bus turnaround or standby modes. Use Value: 25-Ω output impedance matches typical PCB trace impedance, minimizing reflections and ensuring clean address setup/hold timing. |
Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) with minimal skew. IC Role / Device Role / Timing Role: Low-skew, high-drive clock fanout buffer with independent enable control per group. Use Value: 5.5-ns max propagation delay and distributed power pins maintain sub-nanosecond inter-channel skew across all eight outputs. |
| Bus Transceivers | Industrial Control Backplanes |
Use Scenario: Bidirectional data bus interface between processor and peripheral modules using time-multiplexed read/write cycles. IC Role / Device Role / Timing Role: Octal 3-state driver enabling direction-controlled data flow without external direction logic. Use Value: Independent 1OE/2OE allows staggered enable timing to prevent bus contention during direction transitions. |
Use Scenario: Interfacing PLC I/O modules to central controller via long, unterminated backplane traces in factory automation cabinets. IC Role / Device Role / Timing Role: Robust 25-Ω line driver tolerant of noisy industrial environments and wide temperature swings. Use Value: 188-mA IOL and ESD-hardened inputs ensure reliable operation despite EMI, ground shifts, and connector mating cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F25244N | F-family TTL version; higher ICCZ (150 mA), slower tPLH (8 ns), no 25-Ω impedance tuning. | Lacks incident-wave optimization; requires external series termination for clean 25-Ω line driving. | Select only if legacy F-series compatibility or higher drive voltage margin (>5.5 V) is required. |
| SN74ACT25244DW | ACT-family CMOS; lower IOL (24 mA), rail-to-rail VIH/VIL, but insufficient for 25-Ω line driving. | Not suitable for incident-wave transmission line driving; limited to stub-loaded or short-trace applications. | Choose only for low-power, low-noise logic-level translation where 25-Ω line matching is unnecessary. |
Compared with SN74F25244N and SN74ACT25244DW, the SN74BCT25244DB uniquely combines 25-Ω output impedance, 188-mA drive, and BiCMOS speed/noise trade-offs - making it the only option among the three qualified for high-fidelity incident-wave switching on 25-Ω PCB traces.
Availability
SN74BCT25244DB is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, and industrial backplane interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT25244DB 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 specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families.
The SN74BCT25244DB belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered specifically for high-speed, low-noise 3-state bus driving in memory and clock subsystems where transmission-line integrity is critical.
FAQ
What is the maximum output current specification for SN74BCT25244DB?
The SN74BCT25244DB is rated for 188-mA low-level output current (IOL) under recommended operating conditions (VCC = 4.5 V, TA = 25°C). This value ensures reliable incident-wave switching on 25-Ω transmission lines. Absolute maximum rating is 376 mA, but sustained operation above 188 mA may exceed thermal limits or degrade timing margins. Always verify load conditions against the datasheet's electrical characteristics table for SN74BCT25244DB.
Does SN74BCT25244DB support 3.3-V logic inputs?
No, SN74BCT25244DB is a 5-V-only device with TTL-compatible input thresholds: VIH(min) = 2.0 V and VIL(max) = 0.8 V. While 3.3-V logic outputs may meet VIH, they risk marginal noise immunity due to reduced voltage margin. Direct interfacing with 3.3-V systems requires level-shifting circuitry. The SN74BCT25244DB datasheet specifies operation only within 4.5–5.5 V VCC and does not guarantee functionality below 4.5 V.
What package type corresponds to the SN74BCT25244DB suffix?
The "DB" suffix in SN74BCT25244DB is not an official TI package code; TI uses "DW" for SOIC-24. Per TI's packaging addendum, SN74BCT25244DW is the active SOIC-24 variant. "DB" likely reflects a distributor-specific or legacy marking variant of the same DW package. All functional and pinout specifications for SN74BCT25244DB match those of SN74BCT25244DW per TI SCBS064A datasheet.
How does SN74BCT25244DB minimize switching noise compared to standard octal buffers?
SN74BCT25244DB minimizes switching noise through distributed VCC (pins 4, 11, 22) and GND (pins 2, 5, 8, 13, 16, 19) connections - six ground and three power pins physically separate current return paths and reduce ground bounce. This architecture lowers simultaneous switching noise (SSN) during full-bus transitions, unlike conventional octal buffers with single-point VCC/GND. The result is improved signal integrity in memory and clock applications where SN74BCT25244DB is deployed.
Is SN74BCT25244DB suitable for automotive applications?
No, SN74BCT25244DB is characterized for 0°C to 70°C operation and is not AEC-Q100 qualified. It lacks automotive-grade screening, extended temperature range (–40°C to 125°C), and enhanced reliability testing. For automotive use, TI offers pin-compatible alternatives like SN74BCT25244QDRG4 (Q1 grade), but SN74BCT25244DB itself is intended for commercial and industrial equipment only.
SN74BCT25244DB 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:
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- Voltage - Supply:
- -
- Operating Temperature:
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- Grade:
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SN74BCT25244DB FAQ
1.How can I place an order for SN74BCT25244DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT25244DB 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 SN74BCT25244DB reliable?
The price and inventory of SN74BCT25244DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT25244DB is usually 5 days.
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Once your SN74BCT25244DB 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 SN74BCT25244DB?
For technical support, including SN74BCT25244DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT25244DB requirements.
6.How does Aetrix verify that SN74BCT25244DB is sourced from the original manufacturer or authorized distributors?
All SN74BCT25244DB 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 SN74BCT25244DB meets industry standards.
7.What is the process for return or replacement of SN74BCT25244DB?
All SN74BCT25244DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT25244DB, 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 SN74BCT25244DB part is unused and in its original packaging.
Return procedure for SN74BCT25244DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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