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Texas Instruments CD74FCT245M
- Part No.:
- CD74FCT245M
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74FCT245M.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,097
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Product details
Overview
CD74FCT245M from Texas Instruments is a BiCMOS octal bus transceiver with 3-state outputs in SOIC-20 package, designed for bidirectional data flow control between two 8-bit buses. It features 64-mA output sink current, 3.7-V limited output swing to suppress EMI, and operates across 4.75–5.25 V at 0°C to 70°C - used in legacy industrial backplane interfaces and TTL-to-5V CMOS level-shifting applications.
For engineers reviewing the CD74FCT245M datasheet, CD74FCT245M pinout, CD74FCT245M application, or CD74FCT245M equivalent, key selection criteria include direction-control logic behavior, 3-state isolation timing (tdis ≤ 7.5 ns), output current capability under simultaneous switching, and compatibility with 5-V TTL/CMOS mixed-signal systems.
Technical Context
The CD74FCT245M implements a noninverting bidirectional bus interface using BiCMOS circuitry that combines bipolar speed with CMOS low quiescent power. Its output stage clamps high-level voltage to ~3.7 V (two diode drops below VCC), reducing ground bounce and power-bus ringing during parallel switching.
Direction is controlled by DIR input, while OE enables/disables all outputs into high-impedance state. Input isolation from VCC and SCR latch-up resistance ensure robust operation in noisy industrial environments without external protection components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - ensures compatibility with standard 5-V TTL/CMOS logic rails and stable operation under supply variation. |
| IOL per Output | 64 mA - supports driving heavy capacitive loads or multiple inputs without signal degradation. |
| tpd (A↔B) | 1.5 ns to 7 ns - enables high-speed data transfer in synchronous bus architectures with tight timing budgets. |
| VOH / VOL | 2.4 V min / 0.55 V max at IOL = 64 mA - guarantees clean logic thresholds for downstream 5-V CMOS receivers. |
| IOZ (Off-State Leakage) | ±10 µA max - maintains effective bus isolation when OE is high, preventing unintended coupling between A/B buses. |
| θJA | 58 °C/W (SOIC) - defines thermal performance envelope for continuous operation at full drive strength in ambient up to 70°C. |
| Cpd | 49 pF - quantifies dynamic power consumption at 1 MHz; critical for estimating total system power in multi-device bus systems. |
Pinout & Package
CD74FCT245M is housed in a 20-pin SOIC (DW) package with 7.5-mm body width, 2.65-mm max height, and 1.27-mm lead pitch - compliant with JEDEC MS-013 and RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Low = B→A data flow; High = A→B data flow - determines real-time bus directionality without reconfiguration. |
| 2–9 (A1–A8) | Bus A Data Inputs/Outputs | Bidirectional I/O pins connected to first 8-bit bus; high-impedance when OE = High. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output currents; must be low-inductance connection to minimize noise. |
| 11 (VCC) | Power Supply | +5 V supply rail; output voltage swing limited to 3.7 V to reduce EMI and VCC bounce during switching. |
| 12–19 (B1–B8) | Bus B Data Inputs/Outputs | Bidirectional I/O pins connected to second 8-bit bus; electrically isolated from A-side when OE = High. |
| 20 (OE) | Output Enable Input | Active-Low control: Low enables transceiver; High forces all A/B pins into high-Z state for bus arbitration. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Process Technology | Combines bipolar speed and CMOS low static power - achieves 1.5-ns propagation delay with <80 µA ICC quiescent current. |
| Controlled Output Edge Rates | Reduces simultaneous switching noise (SSN); eliminates need for external series termination resistors in most PCB layouts. |
| SCR Latch-Up Resistance | Guaranteed immunity to latch-up under overvoltage or ESD stress - suitable for unbuffered backplane connections in industrial equipment. |
| Input/Output Isolation from VCC | Prevents current injection into VCC during input overvoltage events - enhances reliability in mixed-voltage system hot-swap scenarios. |
| Buffered Inputs | High fan-in tolerance and consistent threshold behavior - ensures reliable operation even with long trace stubs or unterminated lines. |
Applications
| Industrial Backplane Interface | TTL-to-5V CMOS Level Translation |
|---|---|
|
Use Scenario: Bidirectional data exchange between microcontroller subsystems and peripheral modules on a shared 8-bit ISA-style backplane. IC Role / Device Role / Timing Role: Bus transceiver managing A/B bus direction under CPU control via DIR and enabling/disabling under DMA controller via OE. Use Value: 64-mA sink capability drives long traces and multiple receivers; 3.7-V output swing minimizes ground bounce across 20+ cm backplane runs. |
Use Scenario: Interfacing legacy 5-V TTL peripherals (e.g., UARTs, parallel port controllers) with modern 5-V CMOS microcontrollers. IC Role / Device Role / Timing Role: Voltage-compatible bidirectional translator ensuring valid VOH/VOL levels for both TTL and CMOS logic families. Use Value: Noninverted outputs preserve data polarity; 1.5-ns tpd meets setup/hold timing of 20-MHz peripheral clocks without added delay compensation. |
| Legacy Memory Expansion Bus | Programmable Logic I/O Expansion |
|
Use Scenario: Extending address/data bus width between FPGA-based controller and external SRAM/ROM chips in embedded instrumentation. IC Role / Device Role / Timing Role: Octal transceiver providing controlled enable/disable sequencing to prevent bus contention during memory access cycles. Use Value: OE-controlled high-Z state allows safe multiplexing of shared data lines; tdis ≤ 7.5 ns ensures clean disable timing relative to chip-select edges. |
Use Scenario: Adding configurable 8-bit I/O ports to CPLD-based control logic in test equipment or motor drives. IC Role / Device Role / Timing Role: Direction-flexible I/O buffer allowing same physical pins to serve as inputs or outputs based on runtime DIR signal. Use Value: DIR-controlled bidirectionality reduces pin count on host CPLD; 64-mA drive supports LED indicators or optocoupler inputs directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F245N | Same function but TTL process; higher ICC (30 mA typical), slower tpd (10 ns max), no output voltage limiting. | Lacks EMI suppression; unsuitable where ground bounce or radiated emissions must be minimized. | Use only if legacy TTL-only system requires identical AC/DC specs and BiCMOS benefits are not needed. |
| 74AC245SCX | Advanced CMOS; wider VCC range (2–6 V), lower ICC (<5 µA), but only 24-mA IOL and no output swing limiting. | Not pin-compatible; requires redesign for 5-V-only systems due to different VIH/VIL thresholds. | Select when operating outside 5-V rail or ultra-low static power is prioritized over drive strength and EMI control. |
Compared with SN74F245N and 74AC245SCX, the CD74FCT245M uniquely balances 64-mA drive, sub-7-ns timing, and 3.7-V output clamping - making it the only option among the three that simultaneously addresses EMI, speed, and load-driving requirements in fixed 5-V industrial bus designs.
Availability
CD74FCT245M is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory expansion buses, and TTL-to-CMOS level translation requiring stable component supply and long-term obsolescence management.
Supply support for CD74FCT245M 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 logic solutions with over 50 years of industrial-grade product development.
The CD74FCT245M belongs to TI's FCT logic family - engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial and instrumentation systems where reliability and EMI control are mandatory.
FAQ
What is the maximum recommended operating temperature for the CD74FCT245M?
The CD74FCT245M is characterized for operation from 0°C to 70°C ambient temperature. This rating applies to the SOIC (DW) package variant and is validated per TI's production test conditions. Operation beyond 70°C may result in increased leakage current, reduced noise margins, or timing violations - the CD74FCT245M must not be deployed in extended-temperature environments without derating analysis or thermal validation.
Does the CD74FCT245M support true bidirectional data flow without external logic?
Yes, the CD74FCT245M supports true bidirectional data flow using its dedicated DIR pin: when DIR = Low, data passes from B bus to A bus; when DIR = High, data flows from A bus to B bus. No external gates or control sequencing are required - the CD74FCT245M handles direction reversal synchronously with DIR transitions, enabling dynamic bus arbitration in real-time systems.
Why does the CD74FCT245M limit its output high voltage to approximately 3.7 V?
The CD74FCT245M limits VOH to ~3.7 V (two diode drops below VCC) via its BiCMOS output stage to suppress electromagnetic interference and minimize VCC/ground bounce during simultaneous switching of all eight outputs. This design choice directly reduces power-bus ringing - a key benefit confirmed in TI's SCBS721 datasheet - and makes the CD74FCT245M especially suitable for noise-sensitive industrial backplanes where EMI compliance is critical.
Can the CD74FCT245M be used with 3.3-V logic systems?
No, the CD74FCT245M is specified only for 4.75–5.25 V operation and is not compatible with 3.3-V logic systems. Its VIH minimum is 2.0 V and VIL maximum is 0.8 V - acceptable for 5-V TTL/CMOS inputs - but its outputs swing to 3.7 V, which may exceed absolute maximum ratings of 3.3-V receivers. Using the CD74FCT245M in 3.3-V domains risks damage or unreliable operation; dedicated 3.3-V transceivers like SN74LVC245A should be selected instead.
How should the OE pin be handled during power-up to ensure safe startup?
To ensure high-impedance state during power-up or power-down, OE must be held High (disabled) until VCC stabilizes. TI recommends tying OE to VCC through a pullup resistor; the minimum value depends on the driver's sink capability - typically 4.7 kΩ suffices for most microcontroller GPIOs. This prevents bus contention at power-on, and the CD74FCT245M's internal design ensures no glitching occurs on A/B buses during this transition.
CD74FCT245M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74FCT245M FAQ
1.How can I place an order for CD74FCT245M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT245M 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 CD74FCT245M reliable?
The price and inventory of CD74FCT245M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT245M is usually 5 days.
3.What payment methods are accepted for CD74FCT245M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT245M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT245M?
CD74FCT245M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT245M 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 CD74FCT245M?
For technical support, including CD74FCT245M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT245M requirements.
6.How does Aetrix verify that CD74FCT245M is sourced from the original manufacturer or authorized distributors?
All CD74FCT245M 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 CD74FCT245M meets industry standards.
7.What is the process for return or replacement of CD74FCT245M?
All CD74FCT245M units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT245M, 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 CD74FCT245M part is unused and in its original packaging.
Return procedure for CD74FCT245M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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