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Texas Instruments SN64BCT245N
- Part No.:
- SN64BCT245N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN64BCT245N.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,404
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Product details
Overview
SN64BCT245N 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 with direction control (DIR) and output enable (OE), operates at 4.5–5.5 V, and is rated for −40°C to 85°C industrial temperature range.
For engineers reviewing the SN64BCT245N datasheet, SN64BCT245N pinout, SN64BCT245N application, or SN64BCT245N equivalent, key selection criteria include its 8-bit bidirectional bus interface capability, 5-V TTL-compatible I/O, low ICCZ quiescent current (10–15 mA), and robust ESD protection (>2000 V per MIL-STD-883C).
Technical Context
The SN64BCT245N implements a dual-rail, non-inverting octal transceiver architecture with independent DIR and OE controls. Its BiCMOS process enables fast switching (tPLH/tPHL ≤ 7 ns at 5 V, CL = 50 pF) while maintaining low off-state supply current (ICCZ ≤ 15 mA) and high noise immunity (VIH = 2 V, VIL = 0.8 V).
It features active-low output enable (OE) and unidirectional direction control (DIR), supporting two distinct data paths: A→B when DIR = HIGH and B→A when DIR = LOW. Outputs enter high-impedance state when VCC < ~3 V, ensuring bus isolation during power sequencing.
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 logic systems and stable operation across industrial voltage tolerances. |
| Propagation Delay (tPLH/tPHL) | 1–7 ns at VCC = 5 V, CL = 50 pF - enables high-speed bus bridging in real-time control and data acquisition applications. |
| Output Drive (IOL/IOH) | 64 mA sink / −15 mA source on B-side - sufficient to drive multiple TTL loads or terminated transmission lines without external buffers. |
| Input Thresholds (VIH/VIL) | 2.0 V / 0.8 V - provides clear noise margin against 5-V TTL logic levels and reliable interfacing with legacy microcontrollers and FPGAs. |
| ESD Protection | >2000 V per MIL-STD-883C, Method 3015 - ensures robust handling during board assembly and field service in industrial environments. |
| Operating Temperature | −40°C to 85°C - qualified for use in automotive under-hood, industrial PLC backplanes, and outdoor communications equipment. |
| ICCZ Quiescent Current | 10–15 mA at VCC = 5.5 V - minimized via BiCMOS design to reduce standby power in always-on bus interfaces. |
Pinout & Package
SN64BCT245N uses a 20-pin plastic DIP (300-mil) package with 0.3-inch width and through-hole mounting. Pin spacing is 0.1 inch (2.54 mm), compatible with standard PCB footprints and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A-to-B data flow; Low = B-to-A data flow - determines real-time bus traffic direction without software intervention. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | Bidirectional I/O pins tied to one bus segment; high-impedance when OE = HIGH or VCC < ~3 V. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O currents; must be low-inductance connection for signal integrity. |
| 11–18 (B1–B8) | Port B Data Inputs/Outputs | Bidirectional I/O pins tied to second bus segment; electrically isolated from Port A when OE = HIGH. |
| 19 (OE) | Output Enable Input | Active-low control: LOW enables transceiver; HIGH forces all A/B outputs into high-impedance state for bus arbitration. |
| 20 (VCC) | Power Supply | +5 V supply input; requires local 0.1 µF ceramic decoupling adjacent to pin for transient current stability. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Process Technology | Reduces ICCZ by >50% vs. pure bipolar designs - lowers thermal load and improves system-level power budgeting in dense backplane layouts. |
| Power-Up/Down High-Z State | Automatic isolation below ~3 V VCC - prevents bus contention and data corruption during hot-insertion or brownout conditions. |
| 3-State True Outputs | Direct bus-line driving without external pull-ups - simplifies layout and eliminates timing skew from passive termination networks. |
| MIL-STD-883C ESD Rating | >2000 V HBM - meets industrial handling requirements without additional protection circuitry on PCB. |
| Wide Operating Temperature | −40°C to 85°C - validated for deployment in uncontrolled environments including factory automation and telecom infrastructure. |
Applications
| Industrial Backplane Interfacing | Legacy Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Connecting ISA-style peripheral cards to a central controller in programmable logic controllers (PLCs) with mixed-voltage subsystems. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus isolation transceiver enabling synchronous data exchange between 5-V CPU and 5-V I/O modules. Use Value: Eliminates need for discrete logic gates or buffer arrays while maintaining sub-7-ns propagation delay for deterministic cycle timing. |
Use Scenario: Extending address/data bus of an 8051 or Z80-based embedded controller to support additional memory or peripheral ICs. IC Role / Device Role / Timing Role: Octal bus transceiver providing controlled directionality and output disable for shared memory access arbitration. Use Value: Enables clean bus turnaround with guaranteed high-impedance state during reset, preventing data bus contention on power-up. |
| Automotive Diagnostic Interface | Test Equipment Signal Routing |
|
Use Scenario: Isolating diagnostic port signals (K-Line, CAN auxiliary lines) from main ECU bus during firmware updates or calibration. IC Role / Device Role / Timing Role: Controlled-direction bus isolator with fail-safe power-down behavior for safety-critical vehicle communication paths. Use Value: Maintains bus integrity during ignition cycling due to automatic high-Z activation below 3 V, meeting ISO 16750-2 cold-cranking requirements. |
Use Scenario: Reconfigurable signal routing in automated test equipment (ATE) where multiple DUT interfaces share common measurement resources. IC Role / Device Role / Timing Role: Programmable bus switch enabling dynamic path selection between instrument channels and device-under-test pins. Use Value: Supports sub-10 ns switching with minimal crosstalk (Cio = 12 pF), critical for high-fidelity analog/digital stimulus-response testing. |
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 | Same BiCMOS architecture and pinout, but rated only for 0°C to 70°C commercial temperature range; lower ICCZ (8–12 mA). | Limited to non-industrial environments such as office equipment or consumer-grade instrumentation. | Select SN74BCT245N only if ambient operating temperature stays within 0°C–70°C and lower standby current is prioritized. |
| SN64LVTH245N | Low-voltage TTL-compatible (3.3-V supply), higher speed (tPLH ≤ 4.2 ns), but incompatible 5-V I/O thresholds and no MIL-STD-883C ESD rating. | Requires level-shifting when interfacing with legacy 5-V systems; unsuitable for high-noise industrial settings without added protection. | Choose SN64LVTH245N only for new 3.3-V designs where speed and power efficiency outweigh compatibility and ruggedness needs. |
Compared with SN74BCT245N and SN64LVTH245N, the SN64BCT245N uniquely combines industrial temperature range, MIL-qualified ESD robustness, and native 5-V TTL interoperability - making it the sole option for legacy bus upgrades in harsh environments without redesigning power or protection circuitry.
Availability
SN64BCT245N is available at Aetrix Electronics and suitable for industrial backplane interfacing, legacy microcontroller bus expansion, and automotive diagnostic interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN64BCT245N 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN64BCT245N belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, engineered specifically for high-reliability, high-speed bidirectional bus interfacing in mission-critical industrial control and legacy system modernization.
FAQ
What is the operating temperature range of the SN64BCT245N?
The SN64BCT245N is characterized for operation from −40°C to 85°C, making it suitable for industrial and automotive under-hood applications where ambient temperatures exceed commercial-grade limits. This full industrial range is confirmed in the absolute maximum ratings and recommended operating conditions tables of the official SCBS040A datasheet.
Does the SN64BCT245N support 3.3-V logic inputs?
No, the SN64BCT245N does not reliably accept 3.3-V logic inputs. Its input thresholds are specified as VIH = 2.0 V minimum and VIL = 0.8 V maximum at VCC = 5 V, optimized for 5-V TTL signaling. Driving it with 3.3-V logic may result in marginal or undefined switching behavior and is not supported per the datasheet's recommended operating conditions.
Is the SN64BCT245N pin-compatible with the SN74BCT245N?
Yes, the SN64BCT245N is pin-compatible with the SN74BCT245N in the same N-package (20-pin DIP). Both share identical pin assignments, electrical behavior, and functional truth table. However, SN64BCT245N extends the temperature range to −40°C to 85°C, whereas SN74BCT245N is limited to 0°C to 70°C.
What happens to the outputs of the SN64BCT245N during power-up?
During power-up, the SN64BCT245N outputs enter a high-impedance state whenever VCC is below approximately 3 V - a feature explicitly designed to prevent bus contention. This behavior is guaranteed per the datasheet's "High-Impedance State During Power Up and Power Down" specification and applies regardless of DIR or OE logic states.
Can the SN64BCT245N drive unterminated transmission lines?
The SN64BCT245N can drive short unterminated lines (≤10 cm) in low-noise environments, but its 64-mA sink capability and 7-ns edge rates make it susceptible to ringing on longer traces. For reliable operation, TI recommends using series termination (e.g., 33 Ω at driver end) or parallel termination where signal integrity is critical - guidance confirmed in TI application report SCBA005.
SN64BCT245N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 3mA, 24mA; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN64BCT245N FAQ
1.How can I place an order for SN64BCT245N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT245N 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 SN64BCT245N reliable?
The price and inventory of SN64BCT245N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT245N is usually 5 days.
3.What payment methods are accepted for SN64BCT245N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT245N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT245N?
SN64BCT245N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT245N 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 SN64BCT245N?
For technical support, including SN64BCT245N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT245N requirements.
6.How does Aetrix verify that SN64BCT245N is sourced from the original manufacturer or authorized distributors?
All SN64BCT245N 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 SN64BCT245N meets industry standards.
7.What is the process for return or replacement of SN64BCT245N?
All SN64BCT245N units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT245N, 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 SN64BCT245N part is unused and in its original packaging.
Return procedure for SN64BCT245N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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