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Texas Instruments SN64BCT245DWG4
- Part No.:
- SN64BCT245DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN64BCT245DWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,301
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Product details
Overview
SN64BCT245DWG4 from Texas Instruments is an octal bus transceiver with BiCMOS design, 3-state true outputs, and high-impedance state during power up/down. It supports bidirectional asynchronous data transfer between A and B buses, operates from −40°C to 85°C, and features 5 V supply voltage with 64 mA low-level output drive on B-side.
For engineers reviewing the SN64BCT245DWG4 datasheet, SN64BCT245DWG4 pinout, SN64BCT245DWG4 application, or SN64BCT245DWG4 equivalent, key selection criteria include direction-control logic behavior, OE-controlled isolation timing (tPZH/tPLZ ≤ 11.2 ns), bus-drive capability (IOL = 64 mA), and SOIC-20 package compatibility for legacy 5 V TTL/CMOS system interconnects.
Technical Context
The SN64BCT245DWG4 implements a dual-bus, direction-controllable transceiver architecture using BiCMOS process technology to minimize ICCZ (quiescent supply current) while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and CMOS-level output drive. Its DIR input selects A→B or B→A data flow, while OE enables/disables all outputs simultaneously into high-impedance state.
It guarantees safe operation during power sequencing: outputs remain in high-Z when VCC < ~3 V, preventing bus contention. Switching performance is characterized at CL = 50 pF with R1/R2 = 500 Ω, delivering tPLH/tPHL ≤ 7.2 ns over −40°C to 85°C, and supports 5 V ±10% supply range with ESD protection >2000 V per MIL-STD-883C Method 3015.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS logic rails and stable operation across industrial voltage tolerances. |
| Output Drive (B-side) | IOL = 64 mA - enables direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 7.2 ns - supports high-speed bus handshaking in legacy backplane and motherboard designs. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - provides robust noise margin against TTL-level signals and reliable interfacing with older microcontroller peripherals. |
| Power-Up/Down Behavior | High-Z below ~3 V - eliminates bus contention during hot-insertion or asymmetric power-rail ramp-up in multi-voltage systems. |
| ESD Protection | >2000 V HBM - meets MIL-STD-883C requirements for handling and board-level reliability in manufacturing environments. |
Pinout & Package
SN64BCT245DWG4 is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.83 mm long, with 1.27 mm pitch and maximum height of 2.65 mm. Pin 1 is marked by a beveled corner and located at top-left when viewed from top with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | Low = B-to-A data flow; High = A-to-B data flow - determines real-time bus direction without latch or clock. |
| 2–9 (A1–A8) | Port A data I/O | Bi-directional TTL-compatible inputs/outputs tied to one bus segment; driven high-Z when OE = High. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output drivers; must be low-impedance for noise immunity. |
| 11–18 (B1–B8) | Port B data I/O | Bi-directional TTL-compatible inputs/outputs tied to second bus segment; supports higher sink current (64 mA) than A-side. |
| 19 (OE) | Output enable input | Active-Low control: Low = outputs enabled; High = all A/B pins enter high-impedance state - enables bus isolation. |
| 20 (VCC) | Positive supply | 5 V nominal supply rail; powers BiCMOS output stage and input buffers; decoupling required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ to 10–15 mA - lowers standby power in always-on bus interfaces without sacrificing speed or drive strength. |
| 3-State true outputs | Direct bus-line driving without pull-ups - eliminates need for external termination resistors in point-to-point or stubbed bus topologies. |
| Power-up/power-down high-Z | Automatic isolation below ~3 V - prevents data corruption or latch-up during brown-out or sequential power sequencing. |
| TTL-compatible input thresholds | VIL = 0.8 V / VIH = 2.0 V - ensures interoperability with legacy 5 V microcontrollers, FPGAs, and peripheral ICs without level-shifting. |
Applications
| Industrial Backplane Interconnect | Legacy Microcontroller Bus Expansion |
|---|---|
Use Scenario: Connecting isolated processor modules across a 5 V parallel backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling A-to-B or B-to-A data routing under DIR control, with OE-gated isolation during module reset. Use Value: Prevents bus contention during hot-swap or partial power-up via inherent high-Z behavior below 3 V, reducing system-level arbitration complexity. | Use Scenario: Expanding GPIO or memory-mapped I/O on an 8051 or Z80-based controller with limited native bus width. IC Role / Device Role / Timing Role: Level-translating and buffering external peripherals (e.g., LCD controllers, ADCs) onto the main data bus using DIR-driven direction switching. Use Value: Delivers 64 mA sink capability on B-side to directly drive multiple TTL loads, eliminating discrete buffer stages and saving PCB area. |
| Automotive Body Control Module | Test Equipment Data Acquisition Interface |
Use Scenario: Isolating diagnostic communication lines between MCU and sensor clusters in 5 V automotive subsystems. IC Role / Device Role / Timing Role: OE-controlled bus isolator that enters high-Z during MCU reset or sleep mode, blocking spurious signals from waking peripherals. Use Value: Meets automotive temperature range (−40°C to 85°C) and exceeds 2000 V HBM ESD rating for robustness in noisy vehicle electrical environments. | Use Scenario: Interfacing FPGA-based logic analyzers with legacy instrumentation buses (e.g., GPIB auxiliary lines or custom parallel triggers). IC Role / Device Role / Timing Role: Synchronizing data capture between two clock domains using DIR to select source bus and OE to gate sample windows. Use Value: Achieves sub-8 ns propagation delay with 50 pF load - enables precise timing alignment for high-resolution digital signal capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT245N | DIP-20 package; identical electrical specs and pinout; no SOIC footprint. | Suitable for through-hole prototyping or legacy DIP-based systems; lacks surface-mount compatibility. | Select when manual assembly, breadboarding, or compatibility with existing DIP sockets is required. |
| SN74LVTH245A | 3.3 V only (2.7–3.6 V); LVCMOS input thresholds; lower drive (24 mA), faster speed (tPD ≈ 3.5 ns). | Designed for mixed-voltage 3.3 V systems; not 5 V tolerant without level shifters. | Choose for new 3.3 V designs requiring lower power and higher speed; avoid in pure 5 V environments. |
Compared with SN74BCT245N and SN74LVTH245A, the SN64BCT245DWG4 uniquely combines 5 V operation, SOIC-20 packaging, 64 mA B-side drive, and guaranteed high-Z during power transitions - making it the preferred choice for industrial upgrades of legacy 5 V backplanes where layout reuse and voltage compatibility are critical.
Availability
SN64BCT245DWG4 is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy microcontroller bus expansion, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for SN64BCT245DWG4 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 SN64BCT245DWG4 belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, designed specifically for robust, high-drive 5 V bus interfacing in mission-critical industrial and automotive systems where power sequencing safety and TTL compatibility are mandatory.
FAQ
What is the operating temperature range for the SN64BCT245DWG4?
The SN64BCT245DWG4 is characterized for operation from −40°C to +85°C, meeting industrial-grade thermal requirements. This range is explicitly confirmed in the absolute maximum ratings and recommended operating conditions tables of the SCBS040A datasheet, and applies to the DW package variant including SN64BCT245DWG4. No derating is required within this span.
Does the SN64BCT245DWG4 support 3.3 V logic levels?
No, the SN64BCT245DWG4 is a 5 V-only device with VIH = 2.0 V minimum and VIL = 0.8 V maximum, optimized for TTL/5 V CMOS compatibility. It is not 3.3 V tolerant: applying 3.3 V signals to inputs may result in marginal or unreliable switching, and VCC must be maintained between 4.5 V and 5.5 V. For 3.3 V systems, consider SN74LVTH245A instead.
What is the function of the DIR pin on the SN64BCT245DWG4?
The DIR (direction) pin on the SN64BCT245DWG4 controls data flow direction: when DIR = Low, data transfers from B bus to A bus; when DIR = High, data transfers from A bus to B bus. This is a level-sensitive, asynchronous control - no clock or latch is involved. The function is verified in the device's logic diagram and FUNCTION TABLE in the SCBS040A datasheet.
How does the SN64BCT245DWG4 behave during power-up?
During power-up, the SN64BCT245DWG4 automatically places all A and B outputs in high-impedance state until VCC rises above approximately 3 V. This behavior is guaranteed by internal circuitry and prevents bus contention in systems with staggered power-rail sequencing. It is documented in both the description section and electrical characteristics table (IOZ, power-up test condition) of the SCBS040A datasheet.
Is the SN64BCT245DWG4 pin-compatible with the SN74BCT245N?
Yes, the SN64BCT245DWG4 and SN74BCT245N share identical pin functions and logic behavior, differing only in package: DW = SOIC-20, N = PDIP-20. The pinout mapping (DIR, OE, A1–A8, B1–B8, VCC, GND) is fully aligned per TI's logic symbol and top-view diagrams. However, PCB layout must account for SOIC vs. DIP footprint differences - they are functionally equivalent but not mechanically interchangeable.
SN64BCT245DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 3mA, 24mA; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN64BCT245DWG4 FAQ
1.How can I place an order for SN64BCT245DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT245DWG4 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 SN64BCT245DWG4 reliable?
The price and inventory of SN64BCT245DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT245DWG4 is usually 5 days.
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SN64BCT245DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT245DWG4 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 SN64BCT245DWG4?
For technical support, including SN64BCT245DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT245DWG4 requirements.
6.How does Aetrix verify that SN64BCT245DWG4 is sourced from the original manufacturer or authorized distributors?
All SN64BCT245DWG4 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 SN64BCT245DWG4 meets industry standards.
7.What is the process for return or replacement of SN64BCT245DWG4?
All SN64BCT245DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT245DWG4, 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 SN64BCT245DWG4 part is unused and in its original packaging.
Return procedure for SN64BCT245DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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