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Texas Instruments SN74BCT25244DW
- Part No.:
- SN74BCT25244DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT25244DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
SN74BCT25244DW from Texas Instruments is a 25-Ω octal buffer/driver IC 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 features distributed VCC/GND pins to suppress simultaneous-switching noise.
For engineers reviewing the SN74BCT25244DW datasheet, SN74BCT25244DW pinout, SN74BCT25244DW application, or SN74BCT25244DW equivalent, key selection criteria include its 25-Ω line-driving capability, 3-state control via dual OE inputs, SOIC-24 package compatibility, and industrial temperature range (0°C to 70°C).
Technical Context
This BiCMOS buffer implements two independent 4-bit noninverting channels, each controlled by dedicated output-enable (1OE, 2OE) inputs. Its architecture supports incident-wave switching by matching 25-Ω line impedance and delivering high sink current (188 mA) without overshoot or ringing under fast edge conditions.
It uses distributed power/ground pin placement (pins 4, 8, 11, 16, 20, 23) across the SOIC-24 package to minimize ground bounce and supply collapse during concurrent output transitions-critical for reliable bus driving in dense PCB layouts.
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 logic rails and stable operation across voltage tolerance bands. |
| Low-Level Output Current (IOL) | 188 mA - Enables direct incident-wave switching of 25-Ω transmission lines without external termination or driver stages. |
| Propagation Delay (tPLH/tPHL) | 1–5.6 ns - Supports high-speed address and clock distribution up to ~200 MHz system timing margins. |
| 3-State Enable/Disable Time (tPZL/tPHZ) | 3.1–9.7 ns - Allows precise bus arbitration and avoids contention during multi-driver time-division sharing. |
| Input Capacitance (Ci) | 5.5 pF - Minimizes loading on upstream drivers and preserves signal integrity in fanout-critical applications. |
| Quiescent Supply Current (ICCZ) | 7–11 mA - Significantly reduced vs. older bipolar buffers, lowering static power in idle 3-state bus configurations. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial/industrial embedded systems where ambient thermal management is constrained. |
Pinout & Package
SN74BCT25244DW is housed in a 24-pin SOIC (DW) package with 300-mil body width and gull-wing leads. Pin spacing is 0.050", and the package meets JEDEC MS-013AC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 6, 7, 9, 10 | 1Y1–1Y4, 1A1–1A4 | Channel 1 output and input pairs - Noninverting buffer path for first 4-bit data group; Y pins drive loads, A pins accept logic signals. |
| 12, 13, 14, 15, 17, 18, 20, 21 | 2Y1–2Y4, 2A1–2A4 | Channel 2 output and input pairs - Independent second 4-bit buffer bank, enabling dual-bus or split-address driving. |
| 11, 16, 23 | GND | Distributed ground terminals - Reduce common-impedance coupling and ground bounce during simultaneous output switching. |
| 5, 19, 24 | VCC | Distributed power terminals - Stabilize local supply during transient current surges; decoupling caps required per VCC pin. |
| 22, 13 | 1OE, 2OE | Active-low 3-state enables - Independently disable Channel 1 or Channel 2 outputs to isolate buses or prevent contention. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω line driving capability | Matches characteristic impedance of high-speed PCB traces and backplanes, eliminating need for external series termination resistors. |
| BiCMOS process technology | Combines bipolar speed and CMOS input impedance, achieving 188-mA sink current with <11 mA ICCZ quiescent draw. |
| Distributed VCC/GND pin layout | Reduces simultaneous switching noise (SSN) by >40% versus single-rail SOIC packages, improving signal integrity in multi-driver systems. |
| ESD protection | Exceeds 2000 V HBM and 200 V machine model - eliminates need for external ESD diodes in board-level I/O protection schemes. |
| Independent dual-channel 3-state control | Enables selective bus partitioning: e.g., hold one channel active while tri-stating the other during memory refresh cycles. |
Applications
| Memory Address Drivers | Clock Distribution Networks |
|---|---|
Use Scenario: Driving parallel address buses between microcontrollers and SRAM/Flash devices over 25-Ω PCB traces. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address lines during bus turnaround or DMA cycles. Use Value: 188-mA IOL ensures full-swing incident-wave launch into 25-Ω lines, eliminating reflection-induced setup/hold violations. | Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) on a shared trace network. IC Role / Device Role / Timing Role: Low-skew, low-noise clock fanout buffer with independent enable control per channel. Use Value: Distributed VCC/GND pins suppress ground bounce, maintaining <100-ps skew across all eight outputs. |
| Bus Transceivers | High-Density Logic Interface |
Use Scenario: Bidirectional data bus isolation between processor and peripheral ASICs using time-multiplexed direction control. IC Role / Device Role / Timing Role: Dual 4-bit 3-state buffer acting as half-duplex transceiver with OE-driven direction arbitration. Use Value: 3.1–9.7 ns enable/disable times allow clean bus handoff with no overlap window, preventing short-circuit currents. | Use Scenario: Interfacing legacy 5-V TTL logic to modern low-voltage FPGA I/O banks requiring level translation and drive strength boost. IC Role / Device Role / Timing Role: Voltage-compatible buffer providing 5-V tolerant inputs and 5-V rail-swing outputs. Use Value: VIH = 2 V and VIL = 0.8 V ensure robust noise margin against 3.3-V logic thresholds while sourcing/sinking full 5-V current. |
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 |
|---|---|---|---|
| SN74ACT244N | CMOS-based; lower IOL (24 mA), higher speed (tPD ≈ 3 ns), but no 25-Ω line-driving optimization. | Best for general-purpose 3-state buffering where line impedance matching is not required. | Select when lower power and faster propagation are prioritized over transmission-line driving capability. |
| SN74LS244N | Bipolar TTL; higher ICCZ (>30 mA), slower tPD (15–25 ns), no distributed power/ground pins. | Suitable only for legacy 5-V systems with relaxed timing and noise requirements. | Choose only for backward compatibility in existing LS-based designs; avoid for new high-density or high-speed layouts. |
Compared with SN74ACT244N and SN74LS244N, the SN74BCT25244DW uniquely combines BiCMOS efficiency, 25-Ω line matching, and distributed power integrity-making it irreplaceable for incident-wave clock/address distribution in noise-sensitive, high-density PCBs.
Availability
SN74BCT25244DW is available at Aetrix Electronics and suitable for memory address drivers, clock distribution networks, and bus transceivers requiring stable component supply, long-term industrial lifecycle support, and verified SOIC-24 packaging.
Supply support for SN74BCT25244DW 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74BCT25244DW belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered specifically for high-current, low-noise, 25-Ω transmission-line driving in memory and clock subsystems.
FAQ
What is the maximum output sink current specification for SN74BCT25244DW?
The SN74BCT25244DW is rated for 188-mA low-level output current (IOL) under recommended operating conditions (VCC = 4.5 V, TA = 25°C). This value is confirmed in the electrical characteristics table and enables direct incident-wave switching on 25-Ω transmission lines without external current boosting. The SN74BCT25244DW maintains this performance across its full 0°C to 70°C operating range.
Does SN74BCT25244DW support 3.3-V input logic levels?
Yes, the SN74BCT25244DW accepts 3.3-V logic inputs reliably: its VIH (high-level input voltage) is specified at 2.0 V minimum, and VIL (low-level input voltage) at 0.8 V maximum-both comfortably within 3.3-V CMOS/TTL logic thresholds. The SN74BCT25244DW does not require level-shifting circuitry when driven by 3.3-V microcontrollers or FPGAs.
What is the purpose of the multiple VCC and GND pins on SN74BCT25244DW?
The SN74BCT25244DW uses three VCC (pins 5, 19, 24) and three GND (pins 11, 16, 23) connections to minimize simultaneous switching noise (SSN). This distributed power/ground architecture reduces ground bounce and supply droop during concurrent output transitions-critical for maintaining signal integrity in high-density bus applications. Each VCC/GND pair serves localized output sections.
Is SN74BCT25244DW pin-compatible with SN74BCT244 variants?
No, the SN74BCT25244DW is not pin-compatible with standard SN74BCT244 devices. While both are octal 3-state buffers, the SN74BCT25244DW has a unique 24-pin SOIC (DW) pinout optimized for 25-Ω line driving-including distributed VCC/GND and dual OE inputs-whereas SN74BCT244 uses a 20-pin package with different pin assignments and no 25-Ω design focus.
What is the thermal operating range for SN74BCT25244DW?
The SN74BCT25244DW is characterized for operation from 0°C to 70°C, as stated in the recommended operating conditions table. This industrial-grade temperature range makes it suitable for commercial and embedded applications where ambient temperatures remain within standard office or controlled-environment limits. It is not rated for extended temperature operation like the military-grade SN54BCT25244.
SN74BCT25244DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 80mA, 188mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74BCT25244DW FAQ
1.How can I place an order for SN74BCT25244DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT25244DW 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 SN74BCT25244DW reliable?
The price and inventory of SN74BCT25244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT25244DW is usually 5 days.
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SN74BCT25244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT25244DW 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 SN74BCT25244DW?
For technical support, including SN74BCT25244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT25244DW requirements.
6.How does Aetrix verify that SN74BCT25244DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT25244DW 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 SN74BCT25244DW meets industry standards.
7.What is the process for return or replacement of SN74BCT25244DW?
All SN74BCT25244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT25244DW, 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 SN74BCT25244DW part is unused and in its original packaging.
Return procedure for SN74BCT25244DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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