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Texas Instruments SN74BCT2245NSR
- Part No.:
- SN74BCT2245NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74BCT2245NSR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,452
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Product details
Overview
SN74BCT2245NSR from Texas Instruments is an octal transceiver and line/MOS driver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A and B buses. It operates at 4.5 V to 5.5 V, supports direction control (DIR) and output-enable (OE) logic, and features integrated 33-Ω series resistors on all B-port outputs to suppress overshoot/undershoot in high-speed MOS interfacing.
For engineers reviewing the SN74BCT2245NSR datasheet, SN74BCT2245NSR pinout, SN74BCT2245NSR application, or SN74BCT2245NSR equivalent, key selection considerations include its BiCMOS architecture for low ICCZ, 12-mA B-port sink/source capability, 3-state isolation timing (tPZH/tPLZ < 11.4 ns), and SOP-20 (NS) package compatibility with industrial bus buffering and legacy TTL-to-MOS level translation.
Technical Context
The SN74BCT2245NSR implements a dual-bus transceiver architecture with independent DIR and OE controls enabling configurable unidirectional data flow (A→B or B→A) or full 3-state isolation. Its BiCMOS design combines bipolar input stages for TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V) and CMOS output drivers for rail-to-rail swing and reduced static current.
B-port outputs integrate nominal 33-Ω series termination resistors-eliminating external components for impedance matching in MOS gate driving and reducing signal integrity issues like ringing. The device maintains strict timing control: propagation delays range from 1.7 ns (tPLH B→A) to 7.8 ns (tPHL A→B), with enable/disable times under 12.2 ns (tPZH/tPLZ), ensuring deterministic bus arbitration in synchronous and asynchronous systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and mixed-voltage industrial bus systems. |
| B-Port Output Drive | ±12 mA - Sufficient to directly drive MOS gates or multiple TTL loads without external buffers. |
| A-Port Low-Level Sink | 24 mA - Supports robust fanout to standard TTL inputs while maintaining VOL ≤ 0.5 V. |
| Propagation Delay | 1.7–7.8 ns - Enables reliable operation up to ~100 MHz bus clock rates with margin. |
| ICCZ (Quiescent Current) | 8–14 mA - Significantly lower than comparable bipolar transceivers, reducing system power in idle states. |
| ESD Protection | 2000-V HBM / 200-V MM / 1000-V CDM - Meets industrial-grade ESD immunity requirements without external protection. |
| Package | SOP-20 (NS) - Surface-mount, 0.65-mm pitch, 12.6 × 7.4 mm footprint optimized for dense PCB layouts. |
Pinout & Package
SOP-20 (NS) package: 20-pin small-outline package with 0.65-mm lead pitch, 12.6 mm × 7.4 mm body size, and 2.65-mm max height per JEDEC MS-013. Pin 1 located in Q1 quadrant per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: L enables B→A transfer; H enables A→B transfer. |
| 2–9 | A1–A8 | A-side data inputs/outputs - Bidirectional I/O pins connected to source bus. |
| 10 | GND | Ground reference for all internal circuitry and signal return path. |
| 11 | VCC | Positive supply (4.5–5.5 V) powering both input and output stages. |
| 12 | OE | Output-enable active-low: L enables transceiver; H forces all outputs into high-impedance state. |
| 13–20 | B1–B8 | B-side data inputs/outputs - Bidirectional I/O pins with integrated 33-Ω series resistors for MOS interface. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 33-Ω B-port series resistors | Eliminates need for external termination components, reducing BOM count and PCB area in MOS gate-driving applications. |
| BiCMOS process technology | Combines TTL-compatible input thresholds with CMOS-level output drive and low ICCZ for efficient bus buffering. |
| Asymmetric output drive strength | A port sinks 24 mA (TTL-compatible), B port sources/sinks ±12 mA (MOS-optimized), enabling mixed-technology interconnect. |
| Fast 3-state enable/disable timing | tPZH/tPLZ ≤ 11.4 ns ensures minimal bus contention during direction switching in real-time systems. |
| Industrial temperature range | 0°C to 70°C operation supports deployment in commercial and light-industrial embedded environments. |
Applications
| Legacy System Bus Interface | TTL-to-MOS Level Translation |
|---|---|
|
Use Scenario: Interfacing obsolete 5-V TTL microprocessor address/data buses with modern MOS-based peripherals or memory controllers. IC Role / Device Role / Timing Role: Bidirectional transceiver providing direction-controlled data flow and 3-state isolation during bus arbitration. Use Value: Eliminates discrete resistor networks and level-shifter ICs by integrating B-port 33-Ω termination and TTL-compatible VIH/VIL thresholds. |
Use Scenario: Driving high-input-capacitance MOS gates (e.g., power FETs, analog switches) from 5-V TTL logic outputs. IC Role / Device Role / Timing Role: Line driver with controlled edge rates via on-die 33-Ω series resistors to suppress ringing and EMI. Use Value: Reduces gate-drive overshoot/undershoot without external components, improving reliability in motor control and power management circuits. |
| Industrial Backplane Buffering | Test Equipment Signal Routing |
|
Use Scenario: Isolating and routing parallel data lines across modular industrial backplanes subject to noise and crosstalk. IC Role / Device Role / Timing Role: High-speed octal buffer with fast enable/disable (tPZH ≤ 11.1 ns) and low ICCZ for low-power standby modes. Use Value: Maintains signal integrity over 15-cm traces at >20 MHz while minimizing quiescent power draw in multi-module systems. |
Use Scenario: Reconfigurable signal path selection in automated test equipment (ATE) where DUT interfaces require dynamic bus direction control. IC Role / Device Role / Timing Role: Programmable transceiver enabling software-defined A↔B data routing via DIR/OE signals. Use Value: Enables single-hardware platform support for multiple DUT protocols without manual jumper changes or FPGA reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS245N | Bipolar-only design; no integrated series resistors; higher ICCZ (60 mA typical); slower tPHL (15 ns min). | Lacks B-port termination; requires external resistors for MOS driving; less suitable for high-speed or low-power systems. | Choose only when legacy LS logic family compatibility is mandatory and board space allows external termination. |
| SN74LVC245APWR | 3.3-V only operation; CMOS I/O; no built-in termination; supports 3.6-V max VCC; lower drive (24 mA sink/source). | Not 5-V tolerant; cannot replace SN74BCT2245NSR in 5-V systems without level shifters. | Select for new 3.3-V designs requiring lower power and smaller package; not a drop-in replacement for 5-V applications. |
Compared with SN74LS245N, SN74BCT2245NSR delivers faster timing, lower static current, and integrated B-port termination-reducing component count and improving signal fidelity. Against SN74LVC245APWR, it provides native 5-V operation and MOS-optimized drive but lacks 3.3-V compatibility and advanced low-voltage features.
Availability
SN74BCT2245NSR is available at Aetrix Electronics and suitable for industrial backplane buffering, legacy TTL-to-MOS interfacing, and automated test equipment signal routing requiring stable component supply and long-term production continuity.
Supply support for SN74BCT2245NSR 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 connectivity technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74BCT2245NSR belongs to TI's BCT logic family, engineered specifically for high-speed, low-noise bidirectional bus interfacing between TTL and MOS technologies in industrial and instrumentation systems.
FAQ
What is the operating voltage range for the SN74BCT2245NSR?
The SN74BCT2245NSR operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V TTL logic families and provides sufficient margin for ripple and droop in industrial power supplies. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings (−0.5 V to 7 V).
Does the SN74BCT2245NSR require external series resistors on the B-port outputs?
No, the SN74BCT2245NSR does not require external series resistors on the B-port outputs because it integrates nominal 33-Ω resistors internally. These resistors reduce signal overshoot and undershoot when driving MOS gates or transmission lines, eliminating the need for discrete components and simplifying PCB layout for the SN74BCT2245NSR in high-speed interface applications.
How does the direction-control (DIR) pin function on the SN74BCT2245NSR?
The DIR pin on the SN74BCT2245NSR determines data flow direction: when DIR is logic low, data transfers from the B bus to the A bus; when DIR is logic high, data flows from the A bus to the B bus. This bidirectional control enables flexible bus arbitration in systems where master/slave roles change dynamically, and is fully compatible with standard TTL input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) for the SN74BCT2245NSR.
What is the recommended power-up sequence for the SN74BCT2245NSR to ensure high-impedance outputs?
To ensure high-impedance outputs during power-up, the OE pin of the SN74BCT2245NSR must be tied to VCC through a pullup resistor. TI specifies the minimum resistor value based on the current-sinking capability of the driver; a typical value is 10 kΩ. This prevents bus contention before system initialization completes and applies specifically to the SN74BCT2245NSR's active-low OE architecture.
Is the SN74BCT2245NSR RoHS compliant and what is its moisture sensitivity level?
Yes, the SN74BCT2245NSR is RoHS compliant and carries a Moisture Sensitivity Level (MSL) rating of Level-1 at 260°C peak reflow, meaning it is not moisture-sensitive and can be stored indefinitely at ambient conditions without baking prior to soldering. This MSL rating and RoHS status are confirmed in TI's official packaging documentation for the SN74BCT2245NSR.
SN74BCT2245NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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; 12mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74BCT2245NSR FAQ
1.How can I place an order for SN74BCT2245NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2245NSR 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 SN74BCT2245NSR reliable?
The price and inventory of SN74BCT2245NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2245NSR is usually 5 days.
3.What payment methods are accepted for SN74BCT2245NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT2245NSR transactions.
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4.How is shipping managed for SN74BCT2245NSR?
SN74BCT2245NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2245NSR 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 SN74BCT2245NSR?
For technical support, including SN74BCT2245NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2245NSR requirements.
6.How does Aetrix verify that SN74BCT2245NSR is sourced from the original manufacturer or authorized distributors?
All SN74BCT2245NSR 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 SN74BCT2245NSR meets industry standards.
7.What is the process for return or replacement of SN74BCT2245NSR?
All SN74BCT2245NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2245NSR, 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 SN74BCT2245NSR part is unused and in its original packaging.
Return procedure for SN74BCT2245NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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