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Texas Instruments SN64BCT25245DWR
- Part No.:
- SN64BCT25245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN64BCT25245DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,196
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Product details
Overview
SN64BCT25245DWR from Texas Instruments is a 25-Ω octal bus transceiver with BiCMOS design, 188-mA A-port sink capability, −40°C to 85°C operating range, and data flow-through pinout. It enables incident-wave switching on 25-Ω transmission lines in asynchronous bus-to-bus communication for memory address drivers and clock distribution systems.
For engineers reviewing the SN64BCT25245DWR datasheet, SN64BCT25245DWR pinout, SN64BCT25245DWR application, or SN64BCT25245DWR equivalent, key selection criteria include 25-Ω line driving capability, high-impedance state during power sequencing, distributed VCC/GND for noise control, and dual-directional 3-state bus isolation under DIR/OE control.
Technical Context
This transceiver implements dual-directional 3-state logic with independent DIR (direction) and OE (output enable) controls, supporting A→B or B→A data flow per function table. Its BiCMOS architecture reduces ICCZ to 12–16 mA while delivering 188-mA IOL on the A port for incident-wave line driving.
Distributed VCC and GND pins across the 24-pin SOIC package suppress simultaneous switching noise. Outputs enter high-impedance state when VCC < ~3 V, ensuring bus isolation during power-up/down sequences without external sequencing circuitry.
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 stable operation across industrial voltage tolerances. |
| A-port Low-Level Output Current (IOL) | 188 mA - Enables direct incident-wave switching of 25-Ω transmission lines without external buffers. |
| B-port Low-Level Output Current (IOL) | 24 mA - Supports standard TTL load driving on B-side interfaces. |
| Propagation Delay (tPLH/tPHL) | 1.2–7.3 ns - Guarantees sub-8-ns bidirectional timing for high-speed bus arbitration and clock forwarding. |
| Power-Up/Down High-Z Threshold | VCC < ~3 V - Provides automatic bus isolation during brown-out or hot-plug events without auxiliary control logic. |
| ESD Protection | >2000 V per MIL-STD-883C Method 3015 - Meets industrial handling requirements without additional protection circuitry. |
| Operating Temperature | −40°C to 85°C - Qualified for extended industrial environments including motor control and base station backplanes. |
Pinout & Package
SN64BCT25245DWR is housed in a 24-pin SOIC (DW) package with gull-wing leads, RoHS-compliant NIPDAU finish, and JEDEC Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-side data inputs/outputs | Octal bidirectional I/O port connected to source bus; driven low with 188-mA sink capability. |
| B1–B8 | B-side data inputs/outputs | Octal bidirectional I/O port connected to destination bus; driven low with 24-mA sink capability. |
| DIR | Direction control input | High = A→B data flow; Low = B→A data flow; determines active signal path through internal transceiver matrix. |
| OE | Output enable input | Low = outputs enabled; High = all A/B ports placed in high-impedance state for bus isolation. |
| VCC (Pins 13, 20, 22) | Power supply | Distributed VCC pins minimize IR drop and supply noise during simultaneous output switching. |
| GND (Pins 2, 5, 7, 10, 12) | Ground reference | Five distributed GND pins reduce ground bounce and improve signal integrity in high-speed bus applications. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω incident-wave line driving | 188-mA A-port IOL supports clean edge launch into 25-Ω PCB traces without termination resistors at source. |
| Data flow-through pinout | A-port pins on left side, B-port pins on right side - simplifies PCB routing and minimizes trace crosstalk in dense bus layouts. |
| Power sequencing immunity | Automatic high-Z activation below ~3 V VCC eliminates bus contention during power ramp-up/down in multi-rail systems. |
| Distributed VCC/GND network | Three VCC and five GND pins reduce simultaneous switching noise by >30% versus single-supply-pin alternatives. |
| BiCMOS process technology | Reduces ICCZ to 12–16 mA - cuts quiescent power by 60% vs. equivalent bipolar transceivers, critical for thermally constrained modules. |
Applications
| Memory Address Bus Driver | Clock Distribution Hub |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Bidirectional 3-state transceiver isolating memory banks and enabling dynamic address routing. Use Value: 188-mA A-port drive ensures fast, monotonic address transitions across 25-Ω board traces, reducing setup-time violations. |
Use Scenario: Distributing a system clock from a PLL to multiple synchronous peripherals with matched trace lengths. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer replicating and direction-controlling clock signals between clock domains. Use Value: Sub-8-ns propagation delay and distributed power pins maintain <50-ps inter-channel skew across all eight outputs. |
| Backplane Data Bridge | Hot-Swappable Module Interface |
|
Use Scenario: Interfacing processor and I/O modules across a 25-Ω impedance-controlled backplane in industrial PLCs. IC Role / Device Role / Timing Role: Asynchronous bus transceiver enabling protocol-agnostic data exchange between isolated subsystems. Use Value: DIR/OE dual-control allows real-time bus ownership handoff without glitches, supporting deterministic cyclic communication. |
Use Scenario: Connecting hot-pluggable daughter cards to a main controller while preventing bus contention during insertion/removal. IC Role / Device Role / Timing Role: Power-fail-safe isolator that enters high-Z automatically as VCC drops below 3 V during card removal. Use Value: Eliminates need for sequenced power supplies or external reset supervisors-reduces BOM count by one IC per slot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT245DW | Lower A-port IOL (64 mA), no 25-Ω line driving optimization, wider propagation delay (9 ns max). | Suitable for general-purpose 5-V bus isolation but not incident-wave 25-Ω transmission line driving. | Select SN64BCT25245DWR when driving unterminated 25-Ω traces; choose SN74BCT245DW for cost-sensitive, lower-speed legacy designs. |
| SN64BCT25244DWR | Unidirectional (A→B only), identical 188-mA IOL and 25-Ω drive capability, same package and pinout. | Used where bus direction is fixed and reverse traffic is handled by separate path or protocol layer. | Choose SN64BCT25245DWR for full bidirectional flexibility; use SN64BCT25244DWR to reduce control logic complexity in unidirectional systems. |
Compared with SN74BCT245DW and SN64BCT25244DWR, the SN64BCT25245DWR uniquely combines bidirectional 25-Ω line driving, sub-8-ns timing, and automatic power-sequence-safe high-Z-making it the only option for high-speed, hot-pluggable, impedance-matched backplane bridges.
Availability
SN64BCT25245DWR is available at Aetrix Electronics and suitable for memory address drivers, clock distribution hubs, backplane data bridges, and hot-swappable module interfaces requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for SN64BCT25245DWR 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN64BCT25245DWR belongs to TI's BCT logic family, engineered specifically for high-speed, low-noise, impedance-matched bus interfacing in mission-critical industrial backplanes and memory subsystems.
FAQ
What is the primary function of the SN64BCT25245DWR in a digital system?
The SN64BCT25245DWR serves as a bidirectional 25-Ω octal bus transceiver that enables asynchronous data transfer between two 8-bit buses. It uses DIR and OE inputs to control data direction and output enable states, allowing it to isolate buses or route signals either A→B or B→A. Its 188-mA A-port sink current makes the SN64BCT25245DWR especially suited for incident-wave switching on controlled-impedance PCB traces without external termination.
Does the SN64BCT25245DWR support hot-swap operation, and how is this achieved?
Yes, the SN64BCT25245DWR supports hot-swap operation via its intrinsic power-fail detection behavior: outputs enter high-impedance state when VCC falls below approximately 3 V during power-down or card insertion. This eliminates bus contention without external supervisors or sequencing logic. The SN64BCT25245DWR's guaranteed high-Z activation threshold and fast tPZL/tPHZ timing ensure glitch-free transitions during live insertion/removal in modular systems.
How does the SN64BCT25245DWR differ from standard 74-series transceivers like the SN74LS245?
The SN64BCT25245DWR differs fundamentally in architecture and performance: it uses BiCMOS technology (not bipolar), delivers 188-mA A-port sink current (vs. ~24 mA for LS), targets 25-Ω line driving (not 50-Ω), and features distributed VCC/GND pins to suppress switching noise. Unlike SN74LS245, the SN64BCT25245DWR guarantees sub-8-ns propagation delay and automatic high-Z below 3 V-making it suitable for modern high-speed, low-noise industrial backplanes where LS devices would fail signal integrity or timing budgets.
Can the SN64BCT25245DWR be used with 3.3-V logic systems?
No, the SN64BCT25245DWR is specified only for 4.5 V to 5.5 V VCC operation and is not 3.3-V tolerant. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output voltage levels are designed for 5-V TTL compatibility. Applying 3.3-V logic signals risks violating VIH/VIL margins, and operating VCC below 4.5 V invalidates all AC/DC specifications. For 3.3-V systems, TI recommends the SN74AVC25245 or similar AVC-family devices-not the SN64BCT25245DWR.
What package type and lead finish does the SN64BCT25245DWR use, and is it RoHS compliant?
The SN64BCT25245DWR uses a 24-pin SOIC (DW) package with gull-wing leads, NIPDAU (nickel/palladium/gold) lead finish, and is RoHS compliant per EU Directive 2011/65/EU. It carries a Green (low-halogen) designation per JS709B, with chlorine and bromine content ≤1000 ppm. Its moisture sensitivity level is JEDEC Level-1 (unlimited floor life at ≤30°C/60% RH), making it suitable for standard SMT assembly without baking.
SN64BCT25245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 80mA, 188mA; 3mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN64BCT25245DWR FAQ
1.How can I place an order for SN64BCT25245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT25245DWR 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 SN64BCT25245DWR reliable?
The price and inventory of SN64BCT25245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT25245DWR is usually 5 days.
3.What payment methods are accepted for SN64BCT25245DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT25245DWR transactions.
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4.How is shipping managed for SN64BCT25245DWR?
SN64BCT25245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT25245DWR 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 SN64BCT25245DWR?
For technical support, including SN64BCT25245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT25245DWR requirements.
6.How does Aetrix verify that SN64BCT25245DWR is sourced from the original manufacturer or authorized distributors?
All SN64BCT25245DWR 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 SN64BCT25245DWR meets industry standards.
7.What is the process for return or replacement of SN64BCT25245DWR?
All SN64BCT25245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT25245DWR, 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 SN64BCT25245DWR part is unused and in its original packaging.
Return procedure for SN64BCT25245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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