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Texas Instruments SN74BCT2245N
- Part No.:
- SN74BCT2245N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74BCT2245N.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,421
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Product details
Overview
SN74BCT2245N 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 from 4.5 V to 5.5 V, supports direction control via DIR input and output enable via OE input, and features integrated 33-Ω series resistors on B-port outputs to suppress overshoot/undershoot in high-speed digital interfaces.
For engineers reviewing the SN74BCT2245N datasheet, SN74BCT2245N pinout, SN74BCT2245N application, or SN74BCT2245N equivalent, this device is selected for 5-V TTL-compatible bus isolation, level translation between legacy logic families, and driving MOS gate inputs without external termination-key considerations in industrial control backplanes and embedded system interconnects.
Technical Context
The SN74BCT2245N implements a BiCMOS architecture that combines bipolar input stages for high noise immunity and CMOS output stages for low static current. Its dual-bus topology enables configurable data flow (A→B or B→A) under DIR control, while OE independently places both ports into high-impedance state.
Each B-port output integrates a nominal 33-Ω series resistor to dampen signal reflections during fast edge transitions, eliminating need for discrete termination. The A-port outputs are optimized for sourcing/sinking up to 24 mA, while B-port outputs handle ±12 mA, supporting direct drive of MOS gates and TTL loads.
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 LVTTL systems without level-shifting circuitry. |
| Direction Control | DIR input selects A→B (DIR = H) or B→A (DIR = L) - Enables flexible bidirectional data routing in shared-bus architectures. |
| B-Port Series Resistance | 33 Ω integrated per output - Reduces overshoot/undershoot on PCB traces up to 10 cm, eliminating external resistors. |
| Output Drive Capability | A port: 24 mA sink / 3 mA source; B port: 12 mA sink/source - Sufficient to drive multiple TTL loads or MOSFET gates directly. |
| Propagation Delay | tPLH/tPHL ≤ 7.1 ns (VCC = 5 V, CL = 50 pF) - Supports reliable operation at bus clock rates up to ~70 MHz in point-to-point links. |
| ESD Protection | HBM: 2000 V; MM: 200 V; CDM: 1000 V - Meets industrial-grade ESD robustness requirements without external protection diodes. |
| ICCZ Quiescent Current | 8–14 mA (VCC = 5.5 V, outputs open) - Low standby power consumption compared to earlier bipolar transceivers. |
Pinout & Package
SN74BCT2245N uses a 20-pin plastic dual in-line package (PDIP-N), 6.35 mm pitch, 24.2 mm body length, suitable for through-hole prototyping and legacy industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: HIGH enables A→B data transfer; LOW enables B→A transfer. |
| 2–9 | A1–A8 | A-side data inputs/outputs - Bidirectional I/O pins connected to upstream logic or microcontroller data bus. |
| 10 | GND | Ground reference for all internal circuitry and I/O stages. |
| 11 | VCC | Positive supply rail (4.5–5.5 V) powering both input and output stages. |
| 12–19 | B1–B8 | B-side data inputs/outputs - Feature integrated 33-Ω series resistors; drive transmission lines or MOS gates directly. |
| 20 | OE | Output-enable active-low input: LOW enables transceiver; HIGH forces all A/B pins to high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Combines TTL-compatible input thresholds with CMOS-level quiescent current (ICCZ), reducing power by >50% vs. pure bipolar equivalents. |
| Integrated 33-Ω B-port series termination | Eliminates need for 16 external resistors in 8-bit bus designs, saving PCB area and assembly cost while improving signal integrity. |
| Asymmetric drive strength | A port optimized for high sink current (24 mA) to interface with legacy TTL; B port balanced (±12 mA) for MOS gate driving and stub-loaded lines. |
| High-impedance control during power sequencing | OE tied to VCC via pullup ensures safe isolation at power-up/down - prevents bus contention in hot-swap or multi-rail systems. |
| JESD22-compliant ESD protection | 2000-V HBM rating allows handling in non-EPA environments without special precautions, lowering manufacturing overhead. |
Applications
| Industrial Backplane Interface | Legacy Microcontroller Bus Extension |
|---|---|
|
Use Scenario: Isolating and extending parallel address/data buses between PLC CPU modules and I/O expansion cards over 15-cm PCB traces. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing A→B (address write) and B→A (data read) transfers under DIR control, with OE enabling hot-swap-safe isolation. Use Value: Integrated 33-Ω B-port resistors suppress ringing on long traces, maintaining setup/hold timing margins without layout redesign. |
Use Scenario: Connecting an 8-bit microcontroller's port to external peripherals (ADC, DAC, EEPROM) sharing a common data bus. IC Role / Device Role / Timing Role: Level-translating transceiver buffering MCU I/O pins from capacitive bus loading while preserving TTL-compatible voltage thresholds. Use Value: 24-mA A-port sink capability drives multiple TTL inputs; 5-V supply range matches MCU core voltage, avoiding external regulators. |
| MOSFET Gate Driver Interface | Test Equipment Signal Routing |
|
Use Scenario: Driving parallel N-channel power MOSFET gates in motor control H-bridge circuits using logic-level signals. IC Role / Device Role / Timing Role: Line driver providing controlled-edge, low-overshoot gate pulses via B-port outputs with built-in 33-Ω series resistance. Use Value: Eliminates gate resistor population; ±12 mA B-port drive ensures <100 ns turn-on/off times for 10-nF gate capacitance. |
Use Scenario: Reconfigurable signal path switching in automated test equipment (ATE) for routing DUT I/O lines to measurement instruments. IC Role / Device Role / Timing Role: 3-state transceiver acting as programmable bus switch, where DIR selects stimulus/response direction and OE enables channel isolation. Use Value: 7.1-ns max propagation delay supports 10-MHz pattern rates; high-impedance state prevents signal leakage between test channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS245N | Lower drive (20 mA sink), no integrated B-port resistors, higher ICCZ (~50 mA), TTL-only input thresholds. | Requires external 33-Ω resistors for clean edges; less suitable for MOS gate driving or long-trace routing. | Choose when legacy LS logic compatibility is mandatory and board space permits discrete termination. |
| SN74LVC245APW | 3.3-V only operation, higher speed (tPD ≤ 4.5 ns), lower drive (24 mA), no integrated resistors, CMOS input thresholds. | Not 5-V tolerant; requires level shifters for 5-V bus interfacing; unsuitable for direct MOS gate drive without external buffers. | Prefer for new 3.3-V designs needing faster timing but accept added complexity for 5-V interoperability. |
Compared with SN74LS245N, SN74BCT2245N reduces component count via integrated termination and cuts quiescent current by 75%; versus SN74LVC245APW, it maintains native 5-V operation and MOS-driving capability at the cost of slightly higher propagation delay.
Availability
SN74BCT2245N is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microcontroller bus extensions, MOSFET gate driver circuits, and automated test equipment signal routing requiring stable component supply across extended product lifecycles.
Supply support for SN74BCT2245N 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The SN74BCT2245N belongs to TI's BCT (Bipolar-CMOS Transceiver) family, engineered specifically for robust 5-V bus interfacing in industrial control systems where signal integrity, ESD resilience, and backward compatibility with TTL logic are critical.
FAQ
What is the recommended power-up sequence for SN74BCT2245N to prevent bus contention?
TI recommends tying OE to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure all outputs remain in high-impedance state until valid DIR and data signals are established. This prevents unintended data coupling during power ramp-up. The SN74BCT2245N datasheet specifies this configuration to avoid contention on either A or B bus during initialization sequences.
Can SN74BCT2245N interface directly with 3.3-V logic devices?
No, SN74BCT2245N is a 5-V-only device with TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) and 4.5–5.5 V supply requirement. Direct connection to 3.3-V logic risks overvoltage damage to the 3.3-V device outputs and violates SN74BCT2245N's absolute maximum input voltage rating of 7 V. Level-shifting circuitry is required for interoperability.
Why does SN74BCT2245N include 33-Ω resistors only on the B port and not the A port?
The B port is optimized for driving transmission lines and MOS gates, where impedance matching and edge control are critical. The A port targets legacy TTL bus loading, where higher sink current (24 mA) takes priority over edge shaping. This asymmetric design in SN74BCT2245N balances signal integrity on one side with fanout capability on the other, reducing component count without compromising either function.
What is the maximum continuous current rating per SN74BCT2245N output pin?
The absolute maximum rating for current into any output in the low state is 60 mA, but the recommended operating condition limits low-level output current to 24 mA for A-port pins and 12 mA for B-port pins. Exceeding these values risks thermal overstress or parametric shift. The SN74BCT2245N datasheet defines these limits based on junction temperature rise and reliability testing under sustained load.
How does SN74BCT2245N differ from SN74BCT244N in system-level implementation?
SN74BCT2245N is bidirectional with DIR-controlled data flow (A↔B), while SN74BCT244N is unidirectional (A→Y only). SN74BCT2245N supports full-duplex bus arbitration and dynamic direction switching, whereas SN74BCT244N serves fixed-path buffering. Both share BiCMOS process and 33-Ω B-port resistors, but SN74BCT2245N adds direction logic and dual 3-state control, increasing pin count to 20 vs. 20-pin SN74BCT244N's simpler 20-pin layout.
SN74BCT2245N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- 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; 12mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74BCT2245N FAQ
1.How can I place an order for SN74BCT2245N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2245N 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 SN74BCT2245N reliable?
The price and inventory of SN74BCT2245N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2245N is usually 5 days.
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SN74BCT2245N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2245N 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 SN74BCT2245N?
For technical support, including SN74BCT2245N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2245N requirements.
6.How does Aetrix verify that SN74BCT2245N is sourced from the original manufacturer or authorized distributors?
All SN74BCT2245N 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 SN74BCT2245N meets industry standards.
7.What is the process for return or replacement of SN74BCT2245N?
All SN74BCT2245N units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2245N, 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 SN74BCT2245N part is unused and in its original packaging.
Return procedure for SN74BCT2245N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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